May 4, 20197 yr Hi, As y’all know by know - I have Infinisolar 3KW hybrid inverter and a pair of US2000Bs. Its in grid-tied mode, and at the moment I’m prioritising supplying loads over charging batteries - my reasoning being that if there is demand why not supply it there and now. I have 9 350W panels on my inverter which gets me close to the VNE of 500V But I have three extra 350W panels and space to put them. And I wired through cabling for a second string all the way to where my inverter and batteries stand. So I consider to add a second MPPT solar charger connected in parallel to the batteries. Since the panel voltage is quite high it would need to be 150/35. 3 panels is about 1kWp and a Voc at 138V. My inverter can only charge up to 25A and the batteries will take (want?) 50A so there is plenty of room to push in more power. 1kW at 50V about 20A so should work OK. Is it OK to do this? What are the pitfalls? Thanks!
May 4, 20197 yr SOC is handled by the battery (not the inverter) so adding more charging behind its back should not be an issue.
May 4, 20197 yr The one pitfall is having two cooks in the kitchen when charging the battery. I'd put the voltage settings on the external MPPT a little lower than those of the inverter, so the inverter is still in sole charge (so to speak) of finishing the battery charge. Otherwise, it gets confusing, and there is a risk of overcharging the battery. The BMS will prevent that of course, but at the expense of turning off the battery.
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