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gcrank1
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# Posted: 25 Apr 2025 06:03pm
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12v, 100ah x2, I swap out as needed (no charging thus far on site).
I charged it up from the winter lay-up in home basement, let the Meanwell power supply run at 14.2 for more hours than I have before (Ive been just 'topping up' at 13.8). My thinking was that even though Ive used these for a couple seasons (fairly light use) that they maybe could use a good balancing charge.
I put that battery in service maybe early March? for our occasional day trips. We run the 1 ceiling fan on low to mix the air from the heater throughout the space. After each visit when I shut things down I take a look at the bat voltmeter. As of yesterday I figure we've run the fan (nothing else) for about 10hrs total and that bat still is reading 13.3v before actually having a rest!
This is better than Ive seen before 
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paulz
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# Posted: 25 Apr 2025 06:21pm - Edited by: paulz
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Nice! Yeah my Lfp bank has been doing great too. I’m on solar though, and the increased April sun has kept me at 13.3. Great to forget about battery and worry about other things.
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gcrank1
Member
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# Posted: 26 Apr 2025 01:30pm
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Ive been reading up this winter about 'top balancing' (mostly over at DIYSolar forum) and it sounds like some (most?) BMS's dont start balancing until 13.8ish (for a 12v bat). The 14.2 I set the Meanwell at wont hurt an LFP though I do monitor the charging pretty close. Iirc it got up there and the amps had fallen way off but I still let it run for about another hour.
I brought it up so anybody that thinks their bank maybe isn't as strong as they think it should be might consider this.
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paulz
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# Posted: 26 Apr 2025 04:55pm
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Quoting: gcrank1 I brought it up so anybody that thinks their bank maybe isn't as strong as they think it should be might consider this.
Yes, good info. My bank never gets past 13.8 on the solar. On the charger it will get over 14 if I run the genny long enough, but it’s been about 2 months since I last did that, probably wouldn’t hurt to do it again.
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MtnDon
Member
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# Posted: 26 Apr 2025 08:59pm - Edited by: MtnDon
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Quoting: paulz My bank never gets past 13.8 on the solar.
I have no idea what your solar setup is, so this may be a dumb question; what is the solar charge controller absorb voltage setting?
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paulz
Member
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# Posted: 26 Apr 2025 09:51pm - Edited by: paulz
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Ha, glad you asked. Just checked my notes (I’m at the house until tomorrow), I have it set at 13.8. Used to be higher but after a long thread here on ‘Li Battery Charging’ I cut it down. May have been thinking that 3.5 volts per cell was the practical limit, or there may have been something else said.
13.8 is what it’s been at when I arrive lately, before any output. It likely sits at that for several days I’m not there.
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