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I meant I wouldn’t want the active balance working all the time, the battery should stay pretty balanced once’s it’s balanced right?

Thanks a lot, I like this approach and will apply it.

Thanks a lot for the details, I’ll definitely look into that shunt, The more I looked into active balancers the more I don’t like. At most I would use one to top balance than shut it off, but would rather have the passive balance work better. Want to make sure I don’t input something wrong...

People top balance more than once? I should mention I didn’t top balance when I originally got my battery’s they seemed close enough. My bms (overkill solar) performs some balancing but I’m assuming an active balancer does more?

Thanks for the information, just to clarify I meant getting a power supply to perform a top balancing.

So I currently don’t have a power supply so would you suggest getting one to top balance or would the active balance be the better route?

Here’s an update, I’ve been letting the battery fully charge and one of my cells is off from the others. Should I look into do a top balancing?

This was an only a one time thing I rarely run my battery so close to empty. Was stuck in single digit weather for a couple days. Definitely have made it a bed time routine to check the battery levels.

A diesel heater uses that much power and it’s only 4-5 amps with the fan blowing full, most the time it’s 1-2amps.

Happened over night, so can’t be certain. Everything looked normal at 8/9pm with over 100amps left on the battery but at 6 am the battery was dead. I know from 12am-6 the only draw on the battery would have been a heater pulling at max 4-5amps. My best guess is that the 15-20amps I was using...

Yea I definitely know not to blindly trust the bms soc anymore, Can you recommend any shunts? A wireless connection is preferred. I assume I’d attached the shunt between the battery positive and positive bus bar?

Choose? Those are the values that the battery’s displaying while charging. I didn’t choose them they are a byproduct.

I wasn’t aware I needed charge more. Good to know. So if I’m pushing 30amps into the battery it will automatically limit it lower when fully charged?

I ran out of battery unexpectedly last night and after charging fully today these are my values. Should the cell voltage be higher? Is cell 4 with in range of the other three or should I rebalance?

If I flipped the breaker at the battery and the disconnect at the panels, wouldn’t the whole system be dead and serviceable.

Yes the fuse is built in to the inverter.

No sale just like everything being simple. See my updated schematic. My battery is a lifepo4 I built my self with a overkill solar bms.

Thanks for all the Input. Here is my update schematic. Also my panels (FBM400MFG-BB)have diodes in them to keep them working in shade. So they can be in series without getting messed up by shade. I prefer to not double the current.

Setup is for 12v. Panels are hooked up in series for 800watts. I will not pull more than 60amps at anytime. I will only have a tv running off the inverter everything else is dc powered. All wires are less than 2’ long except the pv wires that are 15’ long. Am I missing anything or is something...

So this was the math I was doing as well. I am having a hard time finding a charge controller with these specs. The closest I have found are 100/50 or 150/70 I read somewhere having a max pv input significantly high is bad. So the 150/70 would be not good. Is that right? I have this solar...

Looking for recommendations on what charger controllers I can use for a 75v input and 67 amp current.

Need help figuring out what size charge controller I need for my 12v system. I have 2 400watt panels in series for a total of 800 watts Specs on the panels Voc - 37.2 Vmax - 31.17 Isc - 13.68 Max current - 12.84

I just received my 4 304ah batteries from Ducanpower. And my bms. Other than top balancing is there anything else I should be doing before setting these up to my solar system? And how long can I leave the batteries unattended as I’m not quite ready to start working with them at the moment?

Where did you buy these? I can’t find any distributors.

Ok that’s good to know. What panels do you have?

I am trying to figure out what panels to use for the roof of my school bus. I am wanting to have at least 800watts. I have a 66.5” x 92.5” space to mount panels. (Can be slight bigger than these dimensions) The only panels I have found to give me 800watts in this space is 2 of These Are those...