Portable Power 2000 watt Inverter with Nautilus 90 Amp Battery $950
2000 watt inverter with 90 Amp Motomaster nautilus marine battery. Can support 100 watts load for 7 hours. 2000 watts load for half an hour, 1000 watts load for one hour. Can be assembled on the cart with wheels for $400 extra. Add more features to charge with solar panels.
Check out this Mobile Power Station of 1500 Watts
Solar Backup System 2KW $6000
2 KW backup solar power system 180 Ampere Hour Battery 945-watt solar panels 10-hour backup for the 200-watt load every full charge cycle.