[RE-wrenches] SI/SB MicroGrid - Recovery From Low Battery Shut Off

[Mark Frye]

Hi Guys,

Just wondering about how a SI/SB microgrid works. If all the PV is 
connected to SB inverters, what happens if the loads manage to drain the 
batteries to their low voltage shutdown? Wouldn't the SB stop providing 
the AC sync so then the SB wouldn't have anything to sync to even if 
they had power available from the PV?

How is this handled? It seems to me you would always want to have some 
amount of PV DC coupled.

Thanks,

Mark Frye
Berkeley Solar Electric Systems