10A Active balancer TEST

[@ericklein5097]

Went from 16% SOC (based on lowest cell voltage) to 51% (since the lowest cell is at 51% and the other 1-7 are probably at 53% or so). I think that's a really good example of pointing out why balancing is so important. Your unbalanced pack would have cut out WAY sooner since you had one cell that was so low whereas after balancing you've dramatically increased the runtime Or if you didn't have a BMS and you discharged to say 27.5 or an average of 2.75V per cell that lowest cell would be in the toilet. Probably around 2.00V

[@zaprodk]

Jehu, show us what's under the lid :)

[@jehugarcia]

ae01.alicdn.com/kf/S856eece0deee488b93b6a8e73ae8bb15t.jpg

[@honeybadger6127]

awesome video.. i'm been looking for a good balancer for my LFP home DIY system that has a higher current rating for balancing.

[@vinfel76]

I have the same active balancer for 4s type. Inductor type is better then capacitor type balancer. in my opinion.

[@Stoner916sac]

This. This exactly. Inductor ones will put the cells to .002 apart.

[@Rothammel1]

true

[@whatmust8146]

better then or better than??????

[@korneliusthegrey4923]

Good stuff. Thanks.

[@RobbieHLM]

Is there a possibility to program this balancer. E.g. Set a start and stop voltage?

[@beargang8853]

Hi love your videos and trying to build a battery system for my Semi truck was going go with blutti because it’s easy but when I look it’s cheeper buying Lithium Iron Phosphate batteries is there a charger controller that you recommend and are they only for solar or can I connect it to a wall outlet I have a inverter in my Semi truck and when I’m driving I want to charge my batteries so I can use them when I’m not driving

[@camelbakbfm]

Question: 3S connection of 4S lifepo4 DIY batteries (3 separate BMS). Better to use 3x 4S active balancers or 1x 12S???

[@TheBirells]

There’s a charger like this? Where you can charge every group and it’s up to idn, 20S…

[@aicram62]

Hey Jehu I know you mostly focus on the electronics. Can you direct me to someone who would know about ANY KIND of seating a person could want in ANY KIND of VEHICLE (preferably a van) Or if you have a play list on any of that...? Thank You so much.

[@IfItAintBrokeStillFixIt]

Seller says that it will do 96s battery pack good for EV diy ? anyway to have a display to monitor them ?

[@josephjohnson6626]

That is cool but I think they should make one with a screen.

[@jehugarcia]

I agree, I like to see what's happening

[@panospapadimitriou3498]

can i monitor with rc tool kit m9 ? ? for results ? i need another for multiple batteries and wont use only m9 !!!

[@Ryukachoo]

Think this would work for a 16s electric vehicle battery? I've been trying to find an affordable balance, their solution that actually works but not a lot of things do 16s

[@Ryukachoo]

Also what's the model on that cell voltage monitor? Do they make a 16s variant?

[@johnh8615]

That’s the problem if you plan to have an obscure type of battery. You won’t have much of a choice in options for it.

[@jehugarcia]

here is how you would wire 16s ae01.alicdn.com/kf/S65b4001f0bd64ec6beafd57985bf6a7cW.png

[@Ryukachoo]

@@jehugarcia excellent, thanks for that, it's sort of buried in the Alibaba listing..... Although I still wonder if there's a 16s version of that cool little battery voltage monitor... I imagine I cannot simply wire two of the 8s battery monitors together?

[@Shmade0304]

🔋🔋🔋🔋🔋🙌🏽🙌🏽🙌🏽

[@des2610]

Could I hook this up in parallel with my Daly BMS?

[@jehugarcia]

I don't see why not

[@victorrizalfilosofi]

So its mean 10a on every string? Have you test it?

[@alexandreesquenet3736]

He should have used a clamp to check the amps to see if the balancing depends of the voltage difference or not (prefered).

[@SniperSnake50BMG]

Jehu is there a balancer that can be custom in voltage? I have a couple of packs in LTO and i need to balance them but i need to set the voltages because is different from NMC and LFP...

[@rebelyell1580]

If you go to the link Jehu supplied you will see LTO balancers as well from 6-8S to 6-24S.

[@IfItAintBrokeStillFixIt]

OK so it was 16% SOC at start of test ,How is it showing 51% after 24hr , how has the SOC gone up ?

[@carmichaelmoritz8662]

Either its a scam sales pitch or it reads percentage according to the lowest cell. As soon as one cell reaches uvp under voltage protection the main bms will disconnect the load.

[@toyintoyin7639]

What's the name of the balanceer?

[@zaprodk]

Open the link that Jehu put in the video description.

[@mannyfragoza9652]

all those wires are a complete turn off for me. Give me 12 volt batteries with built in BMS and call it a day

[@ericklein5097]

I have some news that will blow your mind..... Thats what your battery looks like under the plastic and being afraid of those wires are the reason why people like you buy new batteries for $400 instead of doing a free repair or replace a $50 BMS

[@mannyfragoza9652]

@@ericklein5097 you are mostly right and i do know what a BMS looks like whether is under the plastic or in plain view. Maybe its just me but i look at all those wires and cringe. I guess once all the connections are made and a BMS is in place, its set it and forget it. I really don't know if my batteries and balanced or not. So i guess the better system is the one displayed in the video?

[@johnh8615]

They will end up in a new pcb board if we know our go to batty guy. So don’t stress

[@ericklein5097]

@@mannyfragoza9652 Most BMS boards are remarkably simple. The majority of the board is made up of mosfets, electronic switches. Those switches either turn off or turn on the flow of current in or out of the battery. A bunch of parameters can be detected by simple circuits like voltage dividers, a way for the board to measure a voltage. Current can also be measured. Too much current, too high of a voltage, too low of a voltage, blah blah blah all reasons to trip the two "gates into the battery" the mosfets that control the current flow. The other primary part of a BMS is the balancing circuit. Voltage dividers and then bleed resistors that turn energy into heat.....but we're talking about a relatively small PCB so the bleed resistors can't create too much heat which is why MOST BMS's in the 100A range for LiFeP04 have a balancing current of 40-100mA. There are some JK models that go up to 2A. The balance current is how much can be discharged from an individual cell if it is higher than the rest and this is usually done right near the end of the charging cycle. Say all the cells are getting charged with 1A. Cell 1 is ahead of the others so at some point it hits a voltage where the balancer turns on with 100mA current. So now its only charging with 0.9A in hopes of giving the other cells a chance to catch up. Cell 1 is your cell with the lowest capacity thats why its getting to full first. Unforunately bleeding off energy is just inefficient because if you have 1 cell way below the rest thats 3 cells in a 12 volt bleeding off tons of energy (over many cycles) in hopes of one day becoming even. Until then Cell 1 always hits high voltage cutoff first and you have a pack that cant charge alll the way up. First its 3.65V for cell and 3.510V for the rest. Next its 3.65V and 3.513V. Four more cycles later you're up to 3.610 in all the other cells because theres less capacity up top so voltage rises quickly. .Finally by charge/discharge cycle 6 you have cell 1 at 3.650 and the others at 3.645 only a 5mV difference which is the most the BMS can do. But an active balancer doesn't waste energy. It takes the high cell energy and using capacitors (which are essentially batteries) its shuffles the energy from high to low cells. So cell 1 would feed the other 3 and the amount of current drawn from cell 1 is dependent on the voltage difference. It takes 1 whole volt to reach that number on the active balancer (2A, 5A, 10A) and at differences of 0.010V you'll have slowed down to 20 or 30mA but you're so close by that even the most unbalanced batteries can be balanced in a day by a 5A or 10A active balancer unless its a huge battery (>300Ah). The passive balancers dont work well if you have really fast charging current because the balance current doesn't even take a bite out of it. The active balancer doesn't need a charging current to work it just shifts energy around as long as you have it running. There's your simple explanation of the two main parts of a BMS and why the passive balance circuit on a BMS board is inferior to active balancers (burning energy vs shuffling energy)

[@ericklein5097]

@@mannyfragoza9652 the wires are simple after you wire one BMS up. number of cells plus one is your balance cable. 8 cells? 9 pin cable. 24 cells? 25 pin cable. Imagine you have a bunch of AA batteries laid out on their side end to end - [\\\\\\\]+ -[\\\\\\\\\]+ -[\\\\\\\]+ -[\\\\\\\]+ First wire goes on the main negative on the left. Last wire goes to the main positive. Then theres a wire for each gap in between batteries. So its a 4S battery....5 wires on the balance cable, two ends and 3 middle gaps. it means you have a positive and a negative point to measure any cell on there.

[@bocasdeltoro8670]

I have no luck with aliexpress. They want to know my email password.