Lithium batteries and new solar charger
I am replacing my 4 6V batteries I think 2 lithium, have never been impressed by the 30A PWM charger for my 600W solar, probably my fault for using 8 avg wire on a 9m run. Thinking if I get a Victron ...
Forum Discussion
Almot wrote:
It is not uncommon for LFP manufacturers to make battery with BMS cut-off very low, so usable charge of, say, 100AH battery is 97-99AH. Doesn't mean you should draw 99AH every time, it will last longer if you stop at 20%. But then, it will last longer yet if you stop at 40 or 50%. They are not different from wet cells in this respect, the shallower is cycle - the longer is life, but LFP are much more tolerable to partial charging than wet cells (with due consideration to cells balancing).
Some manufacturers make ~120AH battery and sell it as 100AH, with BMS cut-off at ~15% so you are getting 100AH without much damage to cycle life. Lynax were mentioned in another thread. They rate some of their batteries this way (not all of them), and call it "true"-something. You run nominal 100AH battery all the way to BMS cut-off and get 100AH with inaccessible 20AH remaining.
yup its easy to check, fully charge the battery then take 90Ah out of it and read the voltageif its still over 12.5 you can use the full 100% and not worry about it. even at 100% discharge it will last longer than most rv's
Steve
