I have a setup with Solar PV, battery, inverter, and AC load. Between the battery and inverter I have connected a custom circuit with DC power/energy/charge measurement, and a relay.
Problem is, circuit traces are limited to 4.5A, and the inverter charging current can go as high as 10A (and even if the amperage wasn't an issue, the circuit won't measure reverse current anyway).
To get around this, I am planning to connect two branches between the battery and inverter with diodes to control where current flows, like this:
Normally, when solar is charging the battery, current will flow through my measurement/control circuit, to the inverter, and on to the load. When I switch on the backup source to the inverter to charge the battery, the higher current will bypass my measurement/control circuit.
Assuming I can find the right diodes, is there anything wrong with this setup? Anything I'm not considering?