Hi all, New to this forum. I have in my possession 60no. 18650 batteries. Phillips M4605A. Each battery contains 9 cells. Which I believe we should refer to as 3S3P. 10.8V 65Wh = 6.02A each. These batteries have been used for 3 years in medical equipment as a standby. I have charged and discharged a random selection of 20 units over the last few months and have had very good results. Indeed it is unlikely they have been stressed at all. The time has come to put them into service as storage, charged from PV panels, for LED lights. When the Arduino senses an appropriate current from the PV a charger will switch on to the battery. I intent to place in series 2 strings of 5 packs 30.09A = 21.6V, 30.1A. I understand charging is not possible with this configuration and so auto switching from series to paralleling the strings is needed or isolating from each other.
All this is in hand.
What I would like to know is, what charger(S) do I need, or rather which formula is used? To be clear, the charger(S) will plug into a wall socket not the inverter. I may increase to 10 per string, 60.18A. ∴ will 60A charger(S) be ok for 30.09A. This begs the question is the charger intelligent enough to realise this?