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The nominal apparent power of the FHP system is determined by the total apparent power of backup loads.

FHP capacity requirement: Total apparent power of backup loads ＜ FHP apparent power Where apparent power = nominal power (active power) / Power factor If the sum of apparent power of all backup loads is larger than the nominal apparent power of FHP system, overload protection may be triggered, resulting in the power-off of some home loads when the FHP is working in off-grid mode with no sunlight and no generator working.