LiFePo4 lithium battery charging questions
TL DR – I have some questions related to charging 12V LiFePo4 lithium batteries: *How to best use my solar to charge batteries? *Assuming I usually keep the lithium batteries at a partial SOC, what ...
Forum Discussion
“what was your state of charge the previouse day when the sun went down?”
I honestly don’t recall, but if it’s of any help we’ve been using about 30 a/h per day…I have two independent parallel systems, one of 300w MPPT and one (add on) of 140w PMW, and can discontinue charging from either (or both) when strategizing the days net harvest so as to purposefully avoid arriving at 100% SOC (which is typically unnecessary)…
It’s by this means (of anticipating the days harvest vs deficit…) that I might (say, in the AM) shut down one system in preference to the other, to steer-clear of the upper charge limit of 100% SOC (100% is unnecessary due to LFP’s deeper DOD), and in actual daily practice of say ‘to-and-fro’ harvest and discharge occurrence (assuming daily harvest and discharge patterns remain fairly consistent), it’s mostly a ‘set once and forget affair’ that requires little if any intervention…If either of these two aforementioned patterns begin to change, then either of the two solar PV systems can be either taken off line or put back on line (per one’s own informed estimation…) in anticipation of the new conditions..
3 tons
I honestly don’t recall, but if it’s of any help we’ve been using about 30 a/h per day…I have two independent parallel systems, one of 300w MPPT and one (add on) of 140w PMW, and can discontinue charging from either (or both) when strategizing the days net harvest so as to purposefully avoid arriving at 100% SOC (which is typically unnecessary)…
It’s by this means (of anticipating the days harvest vs deficit…) that I might (say, in the AM) shut down one system in preference to the other, to steer-clear of the upper charge limit of 100% SOC (100% is unnecessary due to LFP’s deeper DOD), and in actual daily practice of say ‘to-and-fro’ harvest and discharge occurrence (assuming daily harvest and discharge patterns remain fairly consistent), it’s mostly a ‘set once and forget affair’ that requires little if any intervention…If either of these two aforementioned patterns begin to change, then either of the two solar PV systems can be either taken off line or put back on line (per one’s own informed estimation…) in anticipation of the new conditions..
3 tons
