Hi,
Sorry if my question has already been answered elsewhere. I’ve thoroughly read Victron’s 1.0 rule document and MultiPlus II specs and manual and tried to find an answer to my question in this forum without luck.
According to the 1.0 rule, the battery capacity of an AC coupled ESS should be 4.8 kWh per 1.5 kWp solar installed on the AC out side.
My question is, could a smaller battery capacity be used if the charged current is appropriately configured on the MultiPlus II? If not, why?
For example, Pylontech’s US2000C accepts 25A at 48V continuously (1.2kW), 89A (5.3kW for 1min) and 200A (9.6kW) for 15s. I don’t understand why I couldn’t use it with my 3.8kW PV system if the charge current is well set to 25A. Even in the event of a surge because of abrupt load change during off-grid operation, the battery would accept up to 5kW, giving enough time to the MultiPlus II 48/5000 to raise the frequency and reduce the PV inverted output.
Thanks in advance