Inverter Surge Capacity
An inverter's surge capacity indicates how it handles short-term overload before "tripping". Surge capacity is essential to start up some large loads, especially motors that need 2-3 times their running power to get going. The start period may be very short – a fraction of a second – but it still needs to be considered.
The primary concern is if you have any heavy electrical devices like an arc welder in your home. It is crucial to check your list of electrical appliance usage for any large motor loads that operate simultaneously. It is unlikely that surge capacity will be an issue in the average home.
Inverter Temperature Derating
Most inverters' power protection circuitry is dependent on temperature; that means the maximum load which is run by an inverter is dependent on the ambient temperature. Increases in the internal temperature of the power switching bridge reduce the allowable connected load.
You should check the manufacturer's documentation for graphs that show how temperature affects inverter capacity.
Almost all inverters on off-grid systems are inverter-cum-charger units . You may save some money with an inverter with no battery charger but the charging unit still needs to be purchased if you install a backup generator. The cost of two separate units is more than a combined system, so think ahead.
Nevertheless, good eBay or classified ad deals can save you money on a battery charger after installing the inverter.