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This really needs a thread of its own as the rules are very different when both batteries are the same voltage or the same formulation. Remember. we are talking battery maintenance, NOT self-jumping. So, assuming: -- 24v start battery -- 12v camper battery -- Camper battery is lithium iron...

Gotta go reread this tomorrow! G'nite! EDITED TO ADD: Lots of gems in this one.

Tanx! All makes sense to me. Will throw one into my tank clean/rebuild/replacement.

Just be very, very careful - you can create an infinite loop where each charger is chasing the other. Most of these beasts are intended to turn on when the engine is running, and throttle back when the battery is charged. In this case you need a brick wall that assures that the camper>starter...

To polish a brick is an old expression that means to take an extra, unnecessary step. ;) That said, this thread has been useful. Two useful concepts you have mentioned: -- The voltage that your charger puts out is only loosely related to the voltage at the battery terminal. Ignoring...

Sitec/Iain, Would love a photo or two (not Iain's usual subject) and a recommendation of pump model.

To date, once I got a bad lead on one of the BMS's fixed, I have never seen a difference in voltage of greater than about 0.015v, so the cell to cell balance appears to be very good. Nor have I noticed the BMS go into balance for over a month. So, it sounds like my base settings are not too far...

Sitec, Tell me more. Is the idea that this pump is more powerful than the engine pump? I take it that it is in line, before the first filter/water separator, etc. As I believe that my problem may have been something sucked up from the tank blocking the line, is the idea that this pump would...

"Some balancers do not require any trigger, they do their job at whatever the voltage happens to be when you plug them in" In my case, I do not have a separate balancer. There is a balance function in the BMS with the following parameters: Balance Configuration ● Balancer start voltage: 3400...

Jon/Dimitri, As you might guess, the challenge is to break an infinite loop. No charge from engine to camper unless the engine is RUNNING, and no charge from camper to engine unless the engine is OFF. I do this with two relays, one is a simple on with engine, off when engine off. The other...

Need to be done? As you noted, scholars debate. Typically, these batteries will not balance unless lifted right to the high voltage knee. Also, some battery monitors want to "see" a full charge periodically to calibrate themselves. That is why I specified that I was looking at this as...

Close enough? Several have been used around South America and South Africa. The secret is good use of the crew cab. https://thisbigroadtrip.com/

So "S" = "Series" and "P" = "Parallel." Got it. The cells are said to be rated at 6000 cycles. 1000 cycles is probably longer than my lifetime. :( That said, will keep an eye out for a true 200A BMS. Overkill is said to be working on one. (The are simply importing Chinese BMS, but they test...

"Would be **much** better to first wire the 3P at the 1S level, and then do the 4S. You will get imbalanced wear paralleling 3 strings like that, shorter overall cycling lifespan." BMS is 120A max. My target is 200A as my microwave/stove can draw up to 150A. I picked Overkill Solar as it is...

Polishing a brick. Looking at settings to use with my Magnum inverter/charger in CC/CV mode. Really only use it for maintenance/top balance, etc. So the goal is to do the lithium iron equivalent of an equalization charge. Battery bank is my home brew, 840Ah, made up of three 280Ah batteries...

Wiring is hideous! But safe. The BMS are all suspended on a bridge above the cells. It was a bear to work inside the limited space. The batteries are in the pan built for the AGMS. The wooded dividers, well, divide, and provide a brace for the two aluminum angle bars, which, in turn are...

I use the Overkill Solar BMS, which is a US marketed/supported JDB. Mine are 120A and I use three. If I had a bit more room for batteries, I would have simply built two (not three) batteries of 560Ah each. Would have given me more battery and still lots of headroom over my 150A max load. As you...

As noted, some of the data are dated. -- Composting toilets weren't an option when he first posted. If I had to use a black tank in Europe, I would use a macerator pump and hose, as does Advanced RV. -- Lithium Iron batteries have reached the point (rapidly) where I would not build new with...

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