JAndle
Mad Scientist
I have been working out the basics but I am a little baffled by this: 9600Wp system (for example) to a 48V battery must be providing 200A to the DC coupled node but these systems all have max charging current well under 200A. Should I assume there is a 3-way FET or IGBT coupling so that the inverter preferentially draws (e.g. PV) from the MPPT (leg one) independent of the battery but draws the balance of load from the battery (leg 2) and the battery charge current leg is current limited in leg 3? IE a delta connection of MPPT, inverter, and battery?
Otherwise it seems the charge current is also the PV source limit?
The goal is a 10-12 string, 500-600Voc system with up to 6x 200Ah LFP 48V cells(shy of 50kWh) and a 240V single phase inverter (MPPT and inverter integrated?) with an autotransformer to load balance split phase 120Vac.
I think I dismissed a lot of good inverters over the battery charge limits of the MPPT thinking that was the total PV voltage/current output.
Otherwise it seems the charge current is also the PV source limit?
The goal is a 10-12 string, 500-600Voc system with up to 6x 200Ah LFP 48V cells(shy of 50kWh) and a 240V single phase inverter (MPPT and inverter integrated?) with an autotransformer to load balance split phase 120Vac.
I think I dismissed a lot of good inverters over the battery charge limits of the MPPT thinking that was the total PV voltage/current output.