Product description: Model: PS-4000W
· 4000 Watt continuous pure sine power
· 12000 watt peak power
· Built in smart battery charger with 7 selectable battery type settings
· Auto gen start feature.Multi Stage Smart charger 
· Marine and industrial grade
The 4000 watt 24 volt/ 48 volt  low frequency pure sine inverter charger is three products in one, a combination of an inverter, battery charger and AC auto-transfer switch.
The 4000 watt  low frequency Power inverter charger transforms DC (direct current) power, stored by batteries, into AC (alternating current) electricity that can be used to run your various tools and appliances. This inverter also has a built in AC-to-DC battery converter charger, which allows users to recharge their battery bank from an AC source such as a fuel-powered generator, shore power or a regular outlet at home. The built in battery charger features a seven type battery selector and 4 stage charging, for safely and effectively charging your battery source. Use this product for renewable solar, off-grid, mobile and emergency backup power applications anywhere that uses 120 or 230 volts of alternating current.