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Topic starter
December 29, 2025 5:52 pm
I currently have two 200amp panels fed from this meter.
The Grid Boss when used as a service disconnect, has a max 200A feed from the Grid. How does the Grid Boss during normal operations support a 200A backed up panel and a 200A non-backed up panel (This is from the manual documentation: 200A Backed-Up Loads plus 200A Non-Backed-Up Loads)? I will have a single Flex Boss 21 connected to the Grid Boss,so 90amps added from PV/ESS.
Thanks,
Bob C
December 29, 2025 9:38 pm
@bobc
This depends on how you have the Gridboss set up. This is an example of how it would operate if you were selling back to grid.
Topic starter
December 30, 2025 10:51 pm
Thanks Eric, but my question remains. If you have 200A from the grid enter the Grid Boss, how can you have 200A going to a backup panel, and 200A going to a non-backup panel under normal conditions? I understand when the grid goes down, you lose the 200A to the non-backup panel and only have the Amps supplied by an EG4 hybrid inverter(s) through the Grid Boss to the backed up panel. I just don't understand the architecture of the Grid Boss to see 200A in, and 400A out. I suppose adding a second FlexBoss 21 would add an additional 90A and would accommodate this,
January 2, 2026 4:13 pm
The 200A rating from the grid represents the maximum total current available to the home, enforced by the main breaker. Both the backup panel and the non-backup panel share that same 200A capacity, similar to how a main service panel feeds multiple subpanels in a standard electrical installation.
Each panel being rated at 200A does not mean that 200A is actively flowing to each panel at the same time. It simply means each panel is capable of safely carrying up to 200A if required. The actual current drawn is determined by the connected loads.
Adding another inverter will definitely help power loads better and use less grid.
