Solar battery backup for brownouts in the Philippines

Rooftop solar and net metering do not by themselves keep a house powered in a brownout. Backup depends on a suitable inverter, storage and a circuit that can operate safely when the grid is off.

For a home with a fan, router and refrigerator, the fridge restart and overnight battery charge are useful checks. A backup-load list gives a more useful quote than the size of the panels alone.