When Bulk is finished you are only at 80 %

Yes, too many think that they have a 60 or 80 controller, and that means that they are getting 60 or 80 amps from the controller... Just doesn't happen in the "real world"...

I have to ask... what you what on Lithium Battereis?

While being a new "Tech"... They are just so boring, as the Battery Mgmt System really does all the work... Most Lithiums with a decent BMS all you do is supply voltage and current and the BMS does all the work.

@@RollsBatteryEngineering Yes, I agree not much info can be supplied that isn't already on the spec sheets found on the Rolls website other than maybe describing how the BMS operates when the cells are in a parallel string. How are the individual BMS on each cell connected together and will they communicate with say a Magnum Me-Arc remote controller?

@@Dnnap The BMS needs access to the internal firmware of the product that is connected... There are two types of communication. Open Loop and Closed Loop. Right now there are no comms options for the Magnum product so you would have to use Open Loops comms... which means there is no shared information between the battery and the Magnum inverter. Now with Outback, Schneider, and many other companies, they have a comms software in place... This is closed loop, this means that our battery will control the inverter and tell it when to and when not to charge. Currently, this is not something that is available with Magnum due to their communication problems. There will be more indepth webinars in the near future, but this information is available in our manuals on our webpage, this was an introductory done back in August.

Yea... I've been on the road a bit... Currently working on finishing up some new content, and updating some older content... I should be adding a few videos over the next few weeks!

@@RollsBatteryEngineering excellent job Steve

I'm sorry, but I can't recommend a charger, to many chargers out there to keep up with. You need to have a charger that is programmable for the following settings. Bulk/Absorb, Absorb Timer, Float, EQ, EQ Time and End amps or return amps.

Fair enough thanks for replying so quicking, loving the batteries they are amazing:)

It depends on the type of charger you have. I'm assuming your asking where can you get the battery temp sensor.. these are specific to the charger so you need to talk to the manufacturer of your charge to source the sensor

Are you asking at what voltage to EQ at? EQ'ing is generally done between 2.5 and 2.65 vpc... I'm guessing that you are operating at 48 volts... You will want to EQ between 60, and 64 volts.. How high depends on the damage you've already done to the bank. Frankly if your battery bank is undercharged, or needs to be EQ'ed you should look to adjust your charging parameters first, BEFORE you cook your batteries with an EQ charge.

@@RollsBatteryEngineering wonderful video , extremely informative ..I recently bought four 235ah batteries and have them in series parallel to give me 470ah@12v ..I have 600 w of power coming from the panels , would that be sufficient to charge the batteries properly ? Secondly you mentioned that it's important to have the correct absorbtion time , my controller is set at default 120 mins , is that a correct run time or do I need to adjust ? And lastly you also mentioned that if a battery is only being discharged maybe 20% ( as mine are ) it only needs a full charge every so often , by this do you mean equalization ? Pls excuse the multiple questions as I'm relatively new at this , thanks ....

@@fazimabdool6437 600 watts is okay... depending on how much you load these batteries will determine if the amount of panels is correct. I'm sorry, I can't even begin to tell you if this is enough. Absorb timers are based on the formula .42 X C/20 / Nominal Charge Current... Off hand, you would need about 80 amps of current coming in while in the bulk stage to get the absrob timer to two hours or less. If you are truly only doing 20% cycles... you should focus on getting a full 100% charge at least every 10-14 days. I suggest that you watch some of the other videos, also you can download our manual off our webpage... www.rollsbattery.com.

@@RollsBatteryEngineering ok thanks , one last question , I've been told that if you only discharged a battery 10- 20% everyday it leads to stratification ? If true how do I fix this and my batteries are connected to the mppt and I get loads of sunshine in my country , so based upon my mppt I have 100% charge by noon , is this the 100%charge you are referring to or do you mean an equalization charge every 14 days .. forgive me for my lack of knowledge :)

@@fazimabdool6437 You want to check your SG's at the end of the day... they should be in the 1.265 to 1.275 for a full 100% charge. Our batteries tend to not get Stratified as we use a higher Antimony content and this helps prevent this... If sitting for 4-6 months without a charge this can happen.

Sorry for the delay... choosing a battery for this would depend on the expected load.. FLooded are going to be more maintenance and cheaper, but agms and gels will sit longer if the vehicle is in storage. Agms and gels are a bit more expensive... best thing to do really is to contact a distributor near you and talk with one of thier sales people.

@@RollsBatteryEngineering thanks for the info, I may end up going g with a very expensive limitless 45ah lithium that costs over a grand but should suit my needs

Yes all batteries regard less of the manufacture need 1 to 3" between the batteries for proper cooling

In some cases like in colder areas during the Winter you should push them together to conserve heat

Generally any flooded battery will lose about 10% with no load per month... while VRLA Lead batteries lose about 2-4%... This is with no load... When you load them, with AC loads you also get the inefficiency of the inverters... WIth DC loads you see only about .05% inefficiencies... Where the largest Inefficiencies are is when you enter the absorb charger mode... at this point 80%+ SOC the Lead based batteries charge at only about 20-50% depending on where you are in the stage.. For your case you just need to design it to charge at above what the assumed losses are and what the battery needs to get to full. Generally If you pull out 100 Amps you have to have enough solar to put back 120Amps...

Looks like you also emailed me directly, did you get my response?

Sorry Boss, is the math thing. Look .42 x 1284Ah ÷ 81A = 6.65hr Absorbtion time...? Right?

The inverter is an Inverter/charger... yes... but the Solar Mppt-60 are solar regulators/chargers... the MPPT is just how they regulate the current/voltage.

At a minimum you want 10% of the C/20 rate 10% of an 856 Ah bank is 86 amps! Max is 20% so Max would be 172 amps. Where you are in PR you'll need about 4600 Watts of solar to get 80 amps due to temp and atmospheric losses. about 5600 to get to that 86-90 amp range.

Rolls Battery Engineering .42 X 1284Ah ÷ 128.4 = 4.2hr. Absrbtion time... is my math correct? Based on 110Ah charge rate from inverter XW. What would be Amp charge rate based on 2-mppt 60-150 with 3,900w total... ?

Jerry... I've got to ask you to email me directly.... You've sent dozens of messages, frankly most of these answers are in our manuals, and or in these videos! What is 3900 Watts divided by 48 volts? = 81.25 amps! this means that this is the most current you'll ever see if the panels are 25C and you are getting full sun... Most likely at best on the average this will actually be about 65 amps. So .42 X 1284 / 65 = 8.29 Hours!

Rolls Battery Engineering ok, I didnt read anywere to email you... but your right, theres like 20thousand messages from me. Lol.... guess I dont want my expensive$10,000batt bank to fail... is gonna be a month since insalled. Thank you.

No worries, and I understand... my email is [email protected]. You do have some issues... #1 your bank is too large for your renewable and or your charging sources. It will fail specifically if you don't add more solar, or run the backup generator a few times a week to get the battery bank to a full charge. I will be in PR the week of the 14th doing training at multiple locations around PR, email me and I will put you in touch with the organizer. I don't/won't know the locations probably until a few days before.

Jerry, Here is what I told you in an earlier post... So .42 X 1284 / 65 = 8.29 Hours! this means in PR you get an average of 4.5 hours in the Spring.. 5.5 hours in the summer 3-4 hours in fall and 3-4 hours in the winter... This means generally you are looking 2-4 days of charging with no load to get these fully charged... with load they will never get fully charged. So you will need to run a Generator 2-3 times a week to help, or you need to invest in a larger array.. If you are going to only charge on Solar with that battery bank, you really need about a 10-12kw array.

Rolls Battery Engineering what will improve my charge/performane? Another 15PV 3,900 + 3,900 = 7,800w ?

Jerry Cruz you need to add array, or secondary charge sources... that size battery bank if only operating on array really requires a 8 to 10kw array

Rolls Battery Engineering loud and clear, what size PV I should be shooting for? Is a everyday system. I wanna be self sufficient/off grid.

Jerry Cruz as I said... 8 to 10 kilowatt solar array.

Doesn't matter! You should have your battery temp sensor attached to the side of the battery, and The setting is going to be between 58.8 and 60 volts... The harder you cycle them the higher that setting needs to be... With you and your array, your absorb timers are going to be in the 8-9 hour range.. So you'll probably have to have the array set to 60 volts... while the inverter/charger can be around 59.2 to 59.6.. Assuming you have about 4 Kw of solar... at best with the split arrays is you'll see about 60 amps... maybe peaks to 70.... So .42 X 1284 / 65 = 8.29 Hours! this means in PR you get an average of 4.5 hours in the Spring.. 5.5 hours in the summer 3-4 hours in fall and 3-4 hours in the winter... With the much production, you are never going to get the battery to a full state, without running your generator or connecting to grid.

BlackZero working on it... I'm slammed this week hopefully next week....?

Rolls Battery Engineering I will se you in Puerto Rico next week.

Cool, looking forward to doing some more training, in PR... Looks like we will do one in San Juan.. and one somewhere else on the Island. Not sure where yet.

BlackZero were is enginere gonna arrive? Im also in SanJuan.

I should get that one done Thursday... Stay tuned

Just Posted the Schneider Product Video.

Rolls Battery Engineering Thanks

No, and any company who posts charge by voltage is lying to you... Charging is based on voltage and current. you must give time for the current to flow into the battery.