SOC Drift of JK-BMS and Victron Smart Shunt after 161 days of no 100%SOC reset

[@marcoarpago]

Thank you Andy for confirming no communication needed between battery and BMS, great video as always !

[@ДмитрийМарьянович]

Thank you, best wishes from Ukraine! 👍

[@OffGridGarageAustralia]

Same to you!

[@PkPk-up2bi]

nice little bag with bottles...)) greetings from Ukraine

[@OffGridGarageAustralia]

Got me $31.60 last Monday. That was since Christmas though.

[@PkPk-up2bi]

@@OffGridGarageAustralia it's just a funny question)) I'm sure you're a conscientious grandpa. a lot of people from Ukraine are watching you. our people are suffering a lot because of the power outages due to the war with Russia...((

[@PkPk-up2bi]

it's just a funny question)) I'm sure you're a conscientious grandpa. a lot of people from Ukraine are watching you. our people are suffering a lot because of the power outages due to the war with Russia...((

[@dougle03]

"This is so cool, I could do this all day! - I actually do" - You are not alone 😎😎

[@volodymyrzakolodyazhny]

That's a pure joy! I really can relate. Actually, I guess as most of subscribers do.

[@pmacgowan]

You are a real expert now Andy, thats why JK will get their software properly tested and it will work correctly

[@Housemouse7777]

Huge fan Andy live all tge work you do if it was anyone else i would NOT listen to tgem talk about a bms.If you are having fun thats great. Buuuut everything you are talking about is exactly why i dont use any BMS..... going on ten years now no troubles.

[@pondandmore873]

Hi Andy. Thank you for this informative episode. Now that I have such a system myself. Understanding all those beautiful spreadsheets is a lot easier. i just pause the video to enjoy all the inputs in kW. Beautiful man. Over here I think we are now slowly starting the first of 161 days isch. Once i get my second batch of lf280k in im also instaling the smartshunt. so that I can analyze consumption more easily. Prost

[@OffGridGarageAustralia]

The shunt is really good and works well! Enjoy your 161 days of cooler weather.

[@cabe_bedlam]

"Looks like we need to install more solar." Who would have thought! :D

[@OffGridGarageAustralia]

It never stops, right?

[@jpcme2002]

once again thank you very much Andy!!!

[@OffGridGarageAustralia]

Thank you!

[@ZenBanga]

Enjoy your videos very much...informative and entertaining...great stuff and keep up the stellar work

[@OffGridGarageAustralia]

Awesome, thank you!

[@Self.reliant]

I love the booom team shirt showing support to others in the solar creators universe

[@OffGridGarageAustralia]

Joe sent me some of his shirts as part of the Patreon membership. I love them!

[@sunshineossi]

Another great video about the JKs 👍😅 I recently uploaded a video about the first 3 months of our 48V Victron Solar island system with the JK inverter BMS. Unfortunately, there was also 1 complete system failure😏 My conclusion about the JKs so far: Good BMS with a lot of potential, but there is still a lot of room for improvement in terms of functionality. And the very poor support from JK for the normal end customer is more than disappointing🙄 Because let's be honest: Not every end user has almost 100.000 subscribers on KZbin and therefore gets halfway decent support when something doesn't work perfect, right? 😏😂 Finaly I prefer to leave the SOC calculation to the Victron SmartShunt, because the JK's simply cannot do it reliably🤷🏼‍♂️ Greetings, Ronny

[@OffGridGarageAustralia]

Thanks for sharing. Yes, I agree the JK is far from perfect but still more advanced than any other BMS in this class. If they would just understand the potential of this device if they keep developing the software...

[@easypowerwall]

Hi, I agree it's better to use the victron shunt when you have a victron ECO system to measure the SOC. Have 4x 16S and different SOCs reported by the BMS, even the victron has some challenges as seen in the video of Andy. Your failure triggered me, can you share what happend? Franky - EASYPOWERWALL

[@sunshineossi]

@@easypowerwall We were unable to fully charge our LiFePo4 blocks for several weeks after we started charging our new plug-in hybrid with the Victron Wallbox😅 As a result, the LiFePo4 cells in both blocks no longer reached 3.40V per cell (the balancer was set to 3.40V to start with). As a result, over several weeks, one cell in each block moved towards 2.60V. And then both JK inverter BMSs switched off. And of course, due to the parallel operation of the 2 JK BMS, we did not receive any alarm messages on the Cerbo GX or in the Victron VRM portal (unfortunately we do not have the latest firmware version yet)🤷🏼‍♂️ We have now set the Balancer to 3.20V so that it starts balancing the cells earlier. Fortunately, another 5 kW of Trina Vertex solar power will be added in a few weeks. Then we should no longer have the problem with fully charging the blocks🤞😂

[@DIY_Off-Grid]

I've been abusing my battery to the max twice now, I build it along side Andy's 1.0 pack, so to give a timeline.they are in a harsh environment, very cold winters and relatively hot in the summers( harz Germany), I came back to my batteries about a month ago, the solar panels where completely covered with overgrowth, the s16 pack voltage was 4,2 volts, les than 0.27v per cell. I had to bypass bms and charged them to 2,5 volts with a lifepo4 charger, when they hit 2,5, I moved the charger to the correct side of the bms, and upped the amps to 30, than, while being there and checking the cells for abnormalities continuously, I added about 70 ah of solar. They charged all the way up with no significant ballance difference, but I did lose about 10% capacity. I am very positively impressed with these cells, I'm building a new pack witch I intend to not abuse in the same way, but I will leave this pack working and follow its progress.

[@DIY_Off-Grid]

It has jbd contactor bms, 2x s16. I used jk ballancers, a victron smartshunt and the hybrid aliexpress inverters, 2x 5500watts and 24 ja solar 325 watt panels.

[@SiriusSolar]

For reasons like this I always end up installing an additional battery voltage protection unit just in case.

[@SiriusSolar]

What was drawing power from your batteries? The JK is supposed to go into deep sleep long before that low voltage you ended up at

[@DIY_Off-Grid]

@@SiriusSolar these are the Jbd 250ah contactor bms, I think it was the contactors. The panels pushed some pressure in the system, contactors closed to charge, not enough power to charge, contactors open again, and somehow it made it low enough to open in protection, and than they probably selfdischarged further.

[@DIY_Off-Grid]

I didn't attend to them for about 11 months, so long, but not that long I would say.

[@FutureSystem738]

Thanks Andy, love your work …. As always! (Stay well- I have been really sick with influenza plus pneumonia 😢 not recommended.)

[@OffGridGarageAustralia]

Oh, hope you are getting better soon again, Dave!

[@FutureSystem738]

@@OffGridGarageAustralia Thanks Andy, much appreciated. (You know you’re really crook when you don’t even want to watch favourite KZbin channels- which was me for about two weeks plus.) Cheers

[@ascii892]

Hi Andy, I used the "recommended settings" on the smart shunt and wasn't getting good results, so i put the peukert exponent to 1.00 and charge efficiency to 100% and it was much better. After about 3 months since full charge it reset at 99.9% (with 1-2Ah still consumed)

[@OffGridGarageAustralia]

I read about this before. I have to try as well. Thanks for the reminder and tip!

[@t81s]

When I started with my DYI battery (all your fault Andi!😅) I also had the peukert and efficiency at something else than 1. That resulted in a 20% SOC jump after 3 months of not charging to 100%. Then I set the parameters to 1 and this February when the battery got full again after 3 months the SOC jumped from 97% to 100%.

[@GregOnSummit]

Excellent as always, but wait ... at 14:10. Where did that screen come from?

[@ExaByteTutorials]

i think its home Assistent, but i have no idea how to configure this...

[@pawedugosz8717]

hi Andy, can yo make some deep presentation about your monitoring dashboard ?

[@OffGridGarageAustralia]

Sure thing!

[@the_schmue2973]

Thanks Andy is working on all this....and many thanks to my former me to stay at Liion Batteries...no problems like that.

[@wolfgangbrauel1881]

Dear Andy! I am every time surprised over your videos. I understand often afterwards, why you explain the themes. Often I repeat the videos. Tomorrow I will calibrate my JK-BMS with my 6024 Charger. Wich Connection do you use between two JK-BMS? RS485-2? Next Time I will show you my project, I'm also a hobbyist and like to try things out. Yes, it usually looks easier than it really is. At first everything seems to work, but then you notice that something is wrong, where is the error, you've made the same settings for both batteries, but they still drift apart.🤔

[@timlucas4014]

Hi Andy Thanks for the vidioes.... At 14:14 on the energy dashbord what parrameter did you use for Daily charge/Discharge Cheers Tim

[@TrevorFraserAU]

Thank you Andy!

[@Dutch_off_grid_homesteading]

Heya, after 161 days of not going 100% soc the battery shelf is doning very nive very nice

[@lubhat]

Hi Andy, thanks for very valuable content. Your channel helped me a LOT to build my own Victron based PVE. What temp sensors are you using in 2:19?

[@testitester244]

Had a short in the system just the other day when a snail made it into my multiplus... the JK-BMS switched off instantly. The circuit breakers didn't come near a reaction. Good to know.

[@OffGridGarageAustralia]

A snail! Oh, wow... I'll use more silicone to make my room really tight!

[@beardoe6874]

On the topic of simplicity, I found an inverter with built in mppt solar charge controller, if I have that and a BMS, why would I need any of that Victron stuff? I like pretty graphs but I think the inverter and JK BMS have apps so I should be able to get all of the relevant data without too much trouble. If my solar array and batteries are sized appropriately for my electric usage and the pack never shuts off, I think I just have to do a bit of scheduled maintenance every 4-6 months to ensure the numbers aren't too far off.

[@awesomusmaximus3766]

They have a reputation of high reliability high quality

[@beardoe6874]

@@awesomusmaximus3766 yes but do they do anything I need?

[@casemodder89]

​@@beardoe6874 they are customizable to the brim. and precise at keeping voltages ect. if you just like to charge some lead acid batteries for a bit of illumination in a garage or shed it's fine to use basically everything you can source. with LiFePo that table turns 180°.

[@rankinglion]

Thanks for another great video Andy! What is the monitoring software that shows the 3 x BMS and all their info?

[@OffGridGarageAustralia]

These are the 'Peter Boards' connected to Home Assistant. kzbin.info/www/bejne/rabQaIVuic6kgMU

[@9111logic]

Thanks for this one more update 🙏 You seem to be concentrating on the JK-BMS lately so my question is, do you really think that for the newcomers, it's even worth the debate between that and the Seplos 10E? There seems to be a lot of fuss about this JK controller and I need to understand what is so good about it, is there something that our good old Seplos cannot deliver perhaps? Appreciate your opinion 🥰Greetings from 🇬🇧

[@OffGridGarageAustralia]

Oh, yes, the JK inverter BMS is far ahead of any other BMS in this class. The programming, charge cycle features (absorption, float,...) and programmable dry contacts are something no one else does. I am in contact with Seplos and we discussed the possibility of lowering the voltage after the battery is fully charged. The engineer agreed and had other customers requesting that feature. That was in March though and I have not heard back from them. If they don't design their own software, they cannot compete with JK for example which can deliver a new FW within 30min.

[@9111logic]

@@OffGridGarageAustralia 🙏 thanks for the update

[@WBurg]

@@OffGridGarageAustralia 30 minutes ... we are waiting now more than a week for a new firmware of the jk inverters BMS.

[@wayne8113]

Thanks Andy, Good test 👍

[@sparkletornado5890]

If you don't have a DC system, the Multiplus is excellent at estimating the SOC. When properly set up to communicate with charge controllers, it provides highly accurate readings, typically within 1-2% of a JBD BMS without communication. While a shunt can be useful if you're frequently adjusting capacity or want to manually adjust the SOC, it's not strictly necessary in most cases. For controlling AC-coupled microinverters using the TUYA app, a more efficient approach is to integrate Node-RED with MQTT to turn them off as needed. This allows you to avoid relying solely on frequency shifting, which is better kept as a fail-safe. Frequency shifting is not ideal for many appliances and can introduce unnecessary complications. It will be good to see you do more testing and try different things.

[@OffGridGarageAustralia]

I do have DC loads...

[@sparkletornado5890]

@@OffGridGarageAustralia Use the shunt for the DC loads if you have them.

[@twingoman2000]

Your Airplane was moved while a nearly non visible cut 😂.. Which ghost is in your garage? (around 8:00)

[@upnorthandpersonal]

I run 4 of the JKs with 0.6A for five years already - no issues. By the way, I recently did an experiment to see if I can find bad cell connections in multiple parallel packs. I did that by plotting the cell delta per pack over time. This shows an oscillation on the delta in the pack that has a bad terminal connection - there is a graph in the forum. Maybe something to check with your data on that middle shelf pack - could be interesting. Also, measuring state of charge with a Coulomb counter (shunt) over time when you have a range between 0 and 50A going in the battery and which can fluctuate a lot when using solar is not an easy thing to do...

[@OffGridGarageAustralia]

Interesting, I'll have a look.

[@teapot_]

Andy, I can't remember what you said a long time ago when I first started watching you. You dismissed cutting down trees, and I understand your views on that. But what did you say about using the wind to generate power at night and in the winter when the solar drops off. Also, another site I watch "just have a think" mentioned on one of his blogs (DC to DC charging), that the power from the solar is DC, and you could use that to directly power your cars. Becuase you lose 13% of power converting it to AC, and then your car converts it back to charge the batteries. So, could you charge the cars directly with DC from the solar? Thanks for your Mr blue sky productions.

[@OffGridGarageAustralia]

There is pretty much no wind over here. We are in a valley and apart from the occasional light breeze, it's not worth doing ins this location. I rather install more solar which is far more efficient in this sunny spot. Car charging from DC solar directly will not be possible to use at home. There are far too many regulations and costs involved. It all sounds good in theory, but it is not practical. It's like all these new battery chemistries they promised coming out soon. We have not seen any of that except sodium... AC charging the vehicle is totally fine. 10% loss is a great efficiency and, in my opinion, it is not worth chasing another 3-4% gain in such a case.

[@guillaumepiton]

Hye. You should change the efficient parametre in the victron bmv shunt. For adaptative to reality. For exemple 96%!?

[@OffGridGarageAustralia]

The shunt will be even more conservative with lower settings, I believe. But I will try over the next few weeks.

[@guillaumepiton]

@@OffGridGarageAustralia in my test of eve280k, i have calculate a peukert cofficient of 1.04 and an efficacity of charge of 96%.

[@grua-vfe]

​@@guillaumepiton how did you calculate this?

[@guillaumepiton]

@@grua-vfe i have test the batteries, with many cycles, charge/discharge and with a shunt for calculate Ah and efficacity.

[@halilkacmaz6714]

Thank you so much for this another wonderful video Andy, really appreciated. Just wondering you have at least 3 different micro inverters and you get L1 L2 and L3 3 phase out of them? and this is integrated/synced with your Victron Inverter? if this is the case, can you please make a video more detailed about this? Thanks in advance, hope you have a sunny and fully charged in the rest of the week.

[@OffGridGarageAustralia]

I'm only single phase here. Well, we have 3-phase, but all runs on one single phase. We don't have large loads where we would need 3-phase and single phase is so much easier to handle.

[@2001CamaroSS2070]

What home assistant card are you using? Have you thought about doing a video on your HA setup?

[@keyem4504]

I agree on the communication, I also solely really on my SmartShunt as battery monitor. However, aren't your MPPTs connected to the RasPi GX? It's not only Bluetooth, is it?

[@galax64]

Fantastic system ! What is tilt system?

[@tedhamilton2362]

I keep a Battery voltage chart handy for a (in)sanity check of the Victron voltage. Today, my battery is at 85.1%, 26.47dcv which is in the ballpark of the approx. Capacity. I rarely return to 100% as I run AC occasionally. The system spends most of its time 60-85% SOC

[@daviddutton6532]

Andy one situation to use bms to communicate with Victron. My system is 100% off grid. I must run my generator to fill my pressure tank, 240 volt pump. When the generator is running it also charges batteries through multiplus. This bumps the voltage of the batteries and causes solar chargers to stop charging as they see batteries full. With JK BMS communication to Venus is I don’t waste solar using Victron DVCC.

[@kelgadeke5102]

Good job Andy, you are a Megastar. 😊

[@OffGridGarageAustralia]

That problem can be solved through DVCC and SVS for example. I had similar issues but if all devices read the same voltage, there is no issue any more. A gen kicking in should not cause a voltage spike. This energy should be absorbed by the battery.

[@easypowerwall]

KISS keep it stupid simple, as you mention at the end of the video......communication with BMS is not needed. Just check it every 3 months and you're good to go....

[@OffGridGarageAustralia]

Communication has some benefits but also makes it more complicated. And it is never right as we know!

[@aureltanasan1413]

A while ago, before testing the jk inverter bms, you was mentioning that multiple banks without comms are potentially dangerous. I did ask at the time to expand on this, and other members as well, and you said you will re visit this, as it needs a entire video to it. I guess you changed your mind with this one, as long as you got proper SCC short circuit current interruption on each bank for paralleling, there is no issue. Each bank is managed by its own bms, and have a class T fuse or a breaker with 10ka plus. I use outback DC breakers on each bank, rated for 10ka.

[@joesmith1142]

Very interesting. I thought the smart shunt would be way more accurate because it has such a high resolution measuring amps in and amps out.

[@thawatchaichimpalee355]

When we have the multiple units of battery in parallelly. The master bms should take a SOC value on each battery. And take a calculate as an average value to report to inverter. What do you think?

[@Kanuka-Forest]

Will you change the tail current setting on the smart shunt?

[@vonasi2]

Recently I've noticed the Victron SOC being inaccurate at the lower SOC. Here in the UK recently the sun has disappeared and my two 24V 280Ah batteries have been heavily discharged. I have my system set up to prioritise solar and the grid only kicks in to charge them when their voltages drop into the steep part of the discharge curve. They did this several times last night but Victron thought the SOC was around 35% Sometimes the charger kicks in during the day due to voltage drops caused by heavy loads from power tools and the kettle etc but overnight I don't have these voltage drops and so the cells are actually in that steep part of the discharge curve which I would consider to be a lot lower SOC than Victron's 35% guess. When I look at the Ah graph on VRM it is evident that with each charger cycle the graph steps up indicating that either the discharge or charge amps in/out (or both) are not being accurately recorded. My guess is that the Peukert calculation is the reason for this step in the graph but no different setting seems to fix it. I just don't think that Victrons Peukert setting and charge efficiency setting will ever allow totally accurate recording of SOC and so after a long time without a 100% reset we get this horrible SOC drift. I had the same problem on a previous boat with a Victron BMV and shunt and lead acid batteries.

[@ForgottenGamesAndMods]

What capacity do you set in your JKs relative to actual cell capacities ? The specs capacity, the measured one or something in between?

[@KevIsOffGrid]

similar to mine after similar spells of not hitting 100% for months - but I'm usually above 90% on the BMV when it resets

[@DincaSilviu61]

Hi Andy. Greetings from Romania. I use Homeassistant and the same card as you! I integrated the jk b2a20s20p bms into the HA with a 16 MB31 battery from EVE with the help of the esp32 uni module. it works ok, but I think I discovered a problem with the bms, which when there are float voltages around, when the battery is full, it no longer correctly indicates the current neither when charging nor when discharging, therefore also the power. I calibrated the bms, when the battery is not in the float state it indicates correctly! I think that my hybrid deye inverter introduces pulses into the battery to keep it in float and the bms reads them wrong! I measured one at the same time with the clamp-meter and the current indicated by the bms in the float is incorrect!

[@UKsystems]

One thing that I would recommend if possible if you have any smart home things set up try and do some kind of configuration so one day a month there is minimal load to try and charge the battery up to 100% if possible

We are heading towards our low solar season here in Ohio and the weather forecast is looking like lots of clouds.. Less than 5kw solar production today and the batteries are down to less than 8kw left before they shut down so I hope the Winter reduced rates for grid kilowatts kick in soon..

[@OffGridGarageAustralia]

You get reduced rates for energy during Winter?

[@ekbuz]

@@OffGridGarageAustralia when I lived in Minnesota, USA the rates went up a few cents/kwh for the air conditioning season (Summer), ~May-Sept.

@@OffGridGarageAustralia Yep, it is 12 cents plus the transport fee of 6.5 cents in the Summer and 8.5 cents plus the transport fee of 6 cents in the Winter which bring feet of snow and sub zero F temperatures.. We also have an option to have time designated rates in the Summer where it is a few cents more expensive from 5am to 9pm then gets cheaper overnight by a few cents but I have yet to see the advantage in this, so we are not signed up for that.. Our cost for grid electric has doubled in the past 4 years and we also pay a small fee for just having solar even though we are not allowed to backfeed surplus to the grid like a battery here in Northeast Ohio.. The reduced Winter rates were negotiated when the deregulation occurred and they allowed small green producers with a minimum of 100kwh to feed into the system.. Sold a lie and we are paying for it.. I know grid electric is more expensive Down Under but it is catching up fast.. Thanks for the many peeks into your Off Grid Garage from Ray in Ohio..

[@kevinz8867]

Question for you guys: When you get new LiFePO4 cells shipped to you, should you charge them right away or are they OK to sit for a while? They aren't connected to anything. Is there a shelf life? Thanks!

[@hichamelouatri566]

Hello, very nice videos, I had a question please. I bought a single-phase deye 6kw inverter, I would like to know if it was possible to record it on a three-phase network

[@BenBrand]

If you went 5 months without getting to 100% does that mean your loads are always perfectly matching your solar production? Or is there a certain battery percentage where you start drawing from the grid? If that were the case I would have expected the batteries to never have shut down like you mentioned happening one or two times.

[@OffGridGarageAustralia]

I have to adapt my loads through winter. I cannot have hot water and charge the EV at the same day. Hot water has obviously priority, so have to charge the vehicle from the grid. I'll make a video soon to show how I can survive through the winter. On batteries charged in Summer!😉

[@Juergen_Miessmer]

​@@OffGridGarageAustralia Long term energy storage....very interesting 👍

[@SkypowerwithKarl]

That’s actually a pretty good time for not resetting. The JKs did reasonable well. You could probably find tune them closer but is it really worth it. By the way Andy, have you snugged up on the terminal screws on the Victron charge controllers? That’s only issue with Victron, they tend to loosen up after a while and let out the magic smoke.

[@OffGridGarageAustralia]

Never checked the screws no. They have spring washers so cannot really loosen, I believe. But I'll check.

[@aleksanderp2734]

So can you add the Victron conditions to the Jk bms for reset to 100% when you are in contact with the enginieers?

[@davidrknowles9792]

Does the victron smart shunt take several voltage frames to get its accuracy so it has a reference when countingthe amps. I have found with mine, I have a few different batteries with their own bms, seplos and batrium wm5. I found the problem with the total shunt count is the bleed from the bms to getting accounted for in the total shunt. The seplos is the older version, I haven't done a full charge since adding all the batteries together, so it will be interesting seeing the difference.

[@CollinBaillie]

Every day Andy, I wish I could play the same game you do. Life. Pfft.

[@the_schmue2973]

You can do it. You define your limits.

[@CollinBaillie]

@@the_schmue2973 nah. Life does in this case.

[@the_schmue2973]

@@CollinBaillie why do you think so?

[@rdcabal]

Does the JK balancer during charging, discharging, looking preety? Does it stop balancing when pack is over or under some voltage? I own a battery that came assembled but can't trust it, so discharging only to 30%.

[@krzysztoforlowski6010]

Why did you move 'Peter Boards' from controlling to monitoring?

[@SiriusSolar]

I had a defective outback charge controller send 140 volts from the panel straight to the batteries. JK BMS could not protect against voltage that high and it fried the batteries. New rule, I always install an additional battery voltage protection unit when using solid state BMSs.

[@maritzm]

Hi Andy. How do you display Wp in VRM? My value is not displayed.

[@hichamelouatri566]

Hello comrades, I've been looking at you for a long time, I'm from France, and I would like to know for you, with all the BMS with Balancer that you have tried, which one you really seem to be doing its job perfectly please? at this moment I am with seplos+ active Balancer but I have heard a lot of criticism from you, that I advise you please.

[@techNick0815]

Hi Andy, thanks for demonstrating that also you click the wrong confirm buttons ;o) BTW. Maybe you try another test. I observed my SmartShunt two years now and in my installation its drift is propotional to the time since last sync. In numbers it means that it drifts 0,78% SoC per day (which is equal to a 100mA "hidden load" - maybe its own uncounted consumption?). For average usage it is extremely accurate. Only if I put unusual loads to the system the factor slightly changes. So maybe this is worth to investigate. Beste Grüße aus der alten Heimat!

[@JeGo9]

I could do this all day...... I actually do... Hahaha brilliant 😂

[@OffGridGarageAustralia]

I know, I'm not alone!😆

[@esmailalkassir1565]

33:57 how much is too long ?

[@ThanosSustainable]

Well, it’s actually NOT that the SmartShunt is underreporting… it’s that your batteries have now 12% degradation! 😀

[@betterlifeacademy1744]

I have a question. Woulf it Not be better to Set the Charge voltage a little higher then 3.45V? So charging would be shorter? I drive mine to 3.55V and that is far shorter then 3.45V.

[@nikolastrys4572]

Moin aus Osnabrück. Ich hab jetzt bestimmt schon 100 Videos von dir geschaut (in den letzten 2 Monaten 😅). Ich habe sehr viel gelernt und setze dies in meiner "Off-grid Garage" um. Super! Vielleicht hast du ja mal Lust eine Military grade LiFePo4 Zelle zu testen, natürlich auf deine Art, die ich so mag. Grüße aus not so sunny Germany. Currently 4.3 Amps outside and 13°

[@super_hot_gatto]

I'm reading so many ppl have problems with deep disharge and under voltage in their battery packs... I can't believe how you can permit that. My Victron multiplus ALWAYS setting up to recharge my battery from grid 5% points if go down a certain threshold. If you have big packs ( 15+kwh ) you MUST have a backup to keep your battery charged over a minimum threshold, that's so inexpensive compared to lost/damage a battery pack

[@PhilippeCJR]

Andy, my solarman! I am building 3 packs of 17kwh, Luyuan boxes, and mb31's. You have experience with the dc breakers, like the Yixiang box breaker! When I do 5mins of 140A I measure (Flir) already 50deg celcius at the breaker terminals. Is this normal? Its a 200A Chcyzo model.

[@markh3959]

I have 3x JK BMS here on my LFP cells, but SOC is totally sucks with them. Changed all settings to your settings you got. And still no go to get a 100% SOC. I made a reset again, so it's recalculating again, but it gives the voltages and an percentage. Today again the voltage was good but the SOC was totally sucks again. Installed a shunt yesterday, i recharged all LFP and got an estimate again. But now one battery is claiming its empty and undervolting. I contacted JK, because i have scheduled charge, so i should be fine. But nothing of that is true and JK is not even responding. Also noticed they gave an EOL status to version 14 BMS and now running version 15. So no more updates from them....

[@HellTriX]

My favorite part of this video is when i realized i didn' have to worry about Imperial vs metric. We were all speaking the same language.

[@ronhellenbrand]

12% error in 161 days not bad. Did you do a zero amp calibration? The JK inverter BMS has this error already in a day. How can I get in contact with JK about this incorrect SOC measurement?

[@mosfetkiller3851]

what are your smart shunt settings they can be adjusted to show the soc more reliable

[@OffGridGarageAustralia]

Link is in the video description.

[@marksanders7305]

What Voltage do you recommend to leave these batteries sitting for emergency battery ~ back - up ? 3.2v 280AH AliExpress batteries 24v and I was debating on wiring 2 batteries in parallel 3.2+3.2= 3.2v / 280AH + 280AH = 560AH I have a Seplos 7ss 24v 150A BMS & my inverter is 3,000W inverter 24v - voltage? I’m keeping now at 3.42v

[@Vinh_997]

I think BMS JK should make a SOC setup according to the voltage for BMS to adjust. Although it is not standard, but long time without full charge it is quite standard.

[@DeeFPV]

do you still haft to Top Balance LiFePO4 Battery Cells in 2024

[@rdcabal]

How often thould an LFP battery be discharged to 0% SOC and fully charged%

[@Pimpasxx]

Hi Andy. I did many test with 50Ah What I did. I did full charge of my one cell to 100% . Rest about 8 hours .Discharge (minus 2000mAh) . Rest 8 hours. Next step I started to charge with 0.2C current in bulk mode.When cell richeade 3.45V the battery was fully charged even without any obsortion. I did many and many similar test. I did charge to-3.45-3.47V obsorption time vas from 30s to 2min(without any rest). I using of EBC-A40L Electronic Load Battery Capacity Tester. So if your lowest cell got 3.45-3.47V about 2min your all the cells are 100% charged and any balancing is no nesesary at all as all cells are charged to 100%. I would change 2% of tail to 20% and reduce the time to 30s. If you don't trust or my explanation is unclear :D :D ... Discrage the battery (take off let say 5% off capacity) and charge the cell and you will see when battery takes back the 5% it would be good for your next Video.

[@tedhamilton2362]

Time to add a bunk, Andy.

[@CollinBaillie]

After the battery room build is finished. 😁 He can sleep in there and keep cool in the summer, along with the batteries!

[@mosfetkiller3851]

now the sunshine is going to be lower in europe and the hard solar time start

[@OffGridGarageAustralia]

Welcome sunhsine!

[@BreakymanRec]

Andi Gruß aus Deutschland! Wie machst du das mit 0% Einspeisung? Bei meinem Victron System geht wegen der langsamen Regelung immer etwas zum Grit…

[@Juergen_Miessmer]

Andys system is OffGrid !

[@BreakymanRec]

@@Juergen_Miessmer wie kommt es dann das er Bezug hat?

[@Juergen_Miessmer]

@@BreakymanRec This is the energy coming from the phoenix inverter. It is wired to the grid input of the multiplus.

[@BreakymanRec]

@@Juergen_Miessmer ok thanks

[@wilcostienezen9403]

I had a problem at. 15% soc. Then the battery was empty. I had 48V. Do I need to change the settings in the multiplus? I have 4 batteries of 305aH 16 pcs. So from the settings it looks ok. What can I do to make it work again.

[@OffGridGarageAustralia]

What do you mean by battery was empty at 48V? It sounds like one of your cells had an undervoltage situation or the BMS has shut off because you have set a pack undervoltage or min SOC setting.

[@wilcostienezen9403]

On the multiplus I have Dc input low on 43.30V. DC input restart 49.60V. Charger absorption 56.80 for 1 hout. Float voltage is 54V. Battery monitor settings general cap 1220 charge efficiency 0.95. At the smartshunt it looks ok and resetten to 100% works. At the JK i have the same settings from your website.

[@DanDavison-s9u]

Did anybody think about the Cerbo or Smart Shunt is reporting an incorrect voltage and that is why it seems to have SOC drift? I can't seem to get any meter (Victron stuff too) to agree at the second decimal point.

[@junkerzn7312]

For smart shunt settings, I found the Victron suggested parameters were terrible. I wound up changing the "Charged detection time" to 3 minutes, the "Charged Voltage" to just below the charge target voltage, and, most importantly, I reduced the "Current Threshold" to 0.10A. That seems to avoid false 100% SOC reset triggers due to weather conditions. -Matt

[@OffGridGarageAustralia]

Pretty close to what I have too.

[@theshuff]

10:53 "no solar" medication in the background :D

[@pr5991]

Raining in Melbourne Andy, no good

[@OffGridGarageAustralia]

I know, I watch my son's solar every day. Still don't understand why he moved down there. Not for the weather😆

[@iampennochio]

Anybody would think this guy is power hungry!

[@OffGridGarageAustralia]

I'm not actually!

[@the78mole]

Use Cuponal busbars. Perfect symbiosis of copper and aluminium 😁

[@kecke2937]

Why does Andy have 3 Phases at 28:35? Is it a bug or is he hiding something?

[@owlhollow3992]

would be interesting to know at which latitude you are .

[@CollinBaillie]

It should be around 27.5° South.

[@Flowing23]

👍👍

[@Алексей-е8ь6я]

Добрый день. Привет из Якутии Россия. Сейчас у нас уже зима, снег-10. Как у вас погода? Вы говорите что нет связи, но все отображается. Это через платы Питера? В вашем инверторе есть выравнивающий заряд? Что будет если плата Питера потеряет бмс, заряд прекратится? Всем мира и добра

[@5885ronny]

👍🤗 Gut

[@volodymyrzakolodyazhny]

"Please allow 2-3 cm due to error". 😀

[@AlsinoFerreira]

😎🍻

[@OffGridGarageAustralia]

Hello again!

[@geekmystique]

Can anyone get their JK to bottom calibrate capacity remaining to 0? My JK was reporting around 25 and my cells dropped below 2.9 - i would have loved to have my BMS at least calibrate to 0 because in winter i will not hit 100% any time soon.

[@OffGridGarageAustralia]

What JK model do you have?

[@geekmystique]

@@OffGridGarageAustralia Thanks Andy! I am running a new B2A8S20P for my 8S system.

[@Juergen_Miessmer]

​​@@geekmystique I suggest to calibrate current, voltage and capacity on the JK. And let it do some full cycles.

[@typxxilps]

WEIRD JK BMS OBSERVATIONS ABOUT BALANCING Firmware 15.30 After upgrading I have recognicing today again that for of my cells which had hit the over voltage protection of 3.62 Volt had then been balanced down to 3.594 V where 3.59 would be the OVP recovery point, but then the weird thing happened and the voltage increased over 3.600 V simply by balancing in the wrong direction. The celll voltage difference is also increasing from 255 mV to over 266 mv and now 5 minutes later without charging the balancer has increased the voltage over 3.615 V and I am talking not about 1 random cell but 6 cells are now over 3.615 V. That is competely weird behaviour and I have no clue what is causing this except the firmware update. And then it turn again the balancing direction which mean that now the voltage of the highest voltage cells are reduced by balancing. Sentenced typed and I hit what ? below 3.6 V again And the deviation is down to 244 mV within 1 minute or so Now below 3.58 V and deviation below 228 mV. I do not get it - I had turned floating mode off and had reachted the Ah counter reset point to full capacity and from there on it was really weird this rollercoaster of balancing first in the right direction and then into the opposite directino increasing the deviation. Quite scary to see that cause it was not charging anymore. Homeassistant logged 0 W charging / discharging.

[@Marzec309]

The smart shunt reads within 10% of your BMS's (100+100+71)÷3=90.33% and smart shunt was showing 82%.

[@OffGridGarageAustralia]

Yeah, I'm not counting the JBD as no one is really using it for communication or real SOC calculations.

[@zottinsn]

Hallo und liebe Grüße aus Regensburg, Hast du schon mal das 123 BMS ausprobiert? Ist auch ein spannendes BMS für E-Auto DIY Umbauer da man "unendlich" viele Akkus überwachen kann. Würde mich interessieren was du mit den ganzen Vergleichsmöglichkeiten davon hältst!? LG Zottel Hello and best regards from Regensburg, Have you ever tried the 123 BMS? It is also an exciting BMS for DIY electric car converters because you can monitor an “infinite” number of batteries. I would be interested to know what you think about it with all your comparison options!? LG Zottel