@saulgoodman7221 I ask because generally, you do not run loads that high continually. During an outage, running essentials like fridges, freezers, for example, you can stay well under 1000 watts with room to spare which can be expanded even more if you have timers to run your fridge/freezer that can be run 15 minutes out of every hour and still stay cold as long as you are not constantly opening them. There are ways to extend your available watt hours. That will greatly depend on how big of a system you have built. Heaters are not something you want to run for long periods of time because of the power draw. It's usually best to find alternative methods for heat.