The XPower Powerpack 1500 system consists of a battery pack that stores electricity, advanced electronics that convert 12 volts of DC power from the battery pack to household power, an AC power panel that contains two standard outlets, and a DC power panel that is used to operate 12 volt products.

https://xantrex.com/products/backup-power/xpower-powerpack-1500/

This sells for $700 - $1000 new, usually around $400 used (without extra batteries). This unit has three extra batteries wired on top to DOUBLE the capacity. All six batteries are around a year old and can charge to about 95% of new.

It comes with the original box, all accessories, and the extra three batteries ($40 value each)!

120 VAC
AC output surge capacity (peak) 3000 W
AC output voltage 120 Vac
AC output frequency 60 Hz
AC output waveform Modified Sine Wave
Inverter no-load current 0.30 amps
12 VDC
Internal battery type Sealed lead-acid, AGM
Internal battery capacity 51 amp hours
Internal battery voltage 12 Vdc
DC power socket (circuit breaker) 12 amps
Charging System
AC charger bulk charging current 5 amps
Peak charging voltage 14.4 Vdc
Float charge voltage 13.6 Vdc
Charger input socket current 12 amps 12 amps
Charging Times
Battery Discharge Levels 100% / 75% / 50% / 25%
Recharging time from 120 Vac (home) 24 h / 16 h / 11 h / 6.5 h
Recharging time from 12 Vdc (vehicle) 6 – 8 hrs (100% discharge)

Product weight with handle 53.5 lb (24.3 kg)
Product dimensions without handle (H x W x L) 14.5 x 12.3 x 15.6” (37.0 x 31.3 x 39.5 cm)
Product dimensions with handle (H x W x L) 38.0 x 12.3 x 15.6” (96.5 x 31.3 x 39.5 cm)

Part Number 802-1500

Runtimes (DOUBLE THESE WITH THE THREE EXTRA INCLUDED BATTERIES)

Office Applications Watts Runtime
Laptop 25 27 h 30 min
20” LCD monitor 52 11 h 54 min
Wireless modem/router 6 118 h
Inkjet printer 8 87 h
Table lamp 40 16 h
Emergency Power Applications Watts Runtime
Clock radio 8 87 h
20” LCD TV 75 7 h 42 min
18 cu. ft. fridge 120 4 h 18 min
8.8 cu. ft. freezer 80 7 h 6 min
Sump pump 1/2 hp 300 1 h 18 min
Home alarm system 5 129 h
Microwave 1000 19 min
7 1/4 circular saw 800 25 min
3/8 corded drill 250 1 h 48 min
Jigsaw 150 3 h 18 min
PowerPack 1500 802-1500 12V 2