I have a weird situation.
I am building a new house and I am planning on adding a 24kW generator, but I am also looking at installing a GridBOSS + 2x FlexBOSS21 + batteries. The goal is to have whole home battery backup for a short duration (>1 hour is my design goal, longer is just gravy) and generator for long duration outages. Yes, that is a bit expensive to add both just for battery/power, but I this is my forever home and I'm tired of managing a dozen different standalone UPS on my critical electronics.
I am also thinking of adding solar down the road anyway, so adding the gridboss + flexboss21s at build time makes sense to me.
Questions / Guidance Time!!!
1. The new house is sized similar to my current house and in the same area, so I am expecting electrical loads to be similar. 2x variable speed inverter ACs (so low LRA). Average total usage of 6 kW, short peaks of 20 kW. Based on that I believe I need 2x FlexBOSS21 to ensure I always have enough capacity. The question is that for short battery runtime needs do I NEED 3 batteries, or can I live with only 2? I may add more than 2 after solar, but there will be no solar initially. Obviously 2 batteries is attractive from a cost standpoint.
2. If I need 3 batteries, how is a 2 inverter + 3 battery system wired between inverter and battery? The wiring docs say every other one (which would be battery 1 and 3 in a 1-2-3 config), but then also say to NOT use the end batteries. So would both inverters just go on the central ("2") battery in that case?
Thanks for entertaining the (likely) dumb questions!
Jason
