Use a multimeter to verify the low-voltage logic rails indicated on the diagram (typically 5V DC for the microcontroller and 12V DC for the relay coils and fan). Where to Find Authentic Homage UPS Schematics
Two 12V, 7Ah to 9Ah lead-acid batteries connected in series. The circuit monitors individual battery voltage to prevent over-discharge. Homage Ups Circuit Diagram 1000va Pdf
These are the high-current switches that handle the conversion from 12V DC (battery) to 220V AC (output) when in inverter mode. Use a multimeter to verify the low-voltage logic
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