apctjb
Solar Enthusiast
- Joined
- Jun 16, 2020
- Messages
- 520
Would like to add whole house battery backup to my existing system. I have 5KW on my house with an SMA grid tie inverter, and 6KW on my barn with a Growatt grid tie inverter. I plan on adding an additional 10KW of PV on my garage with hybrid inverter & battery to supply backup power during power outages to all three buildings. So I am looking for an AC coupled system where the hybrid inverter is able to disconnect from the grid during power outages supply power from battery, and throttle the existing grid tie inverters according to the system loads . Simple schematic below.
Curious to get recommendation's on what inverters to consider and gotchas' to look out for.
Note: connecting the existing PV arrays on house and barn directly to the hybrid inverter and eliminating the existing grid tie inverters is not an option. They are all going to have to work together.

Curious to get recommendation's on what inverters to consider and gotchas' to look out for.
Note: connecting the existing PV arrays on house and barn directly to the hybrid inverter and eliminating the existing grid tie inverters is not an option. They are all going to have to work together.
