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I recall you can multiply the voltage used for an ampage of any common utility and typically it is equivalent to the continuous wattage used for that utility. This is how I calculate what and how much I can or cannot run on a single power inverter when in need during a small power outage.
I wish I could lol, I don't draw as good as OP. Instead of the resistance on the top you could say it's similar to continuous vs peak wattage, depending on the wattage your inverter can handle. Standard power inverters are 1000 watts continuous and 2000 peak. Depending on the utility, common utilities have peak wattage doubled the amount of continuous wattage. Not an expert in this field but some utilities like refrigerants and freezers may vary therefore you might need to consider multiplying the wattage three times for their peak. Peak wattage is the heaviest load of power, typically when a utility is turned on for the first second (thus you have to factor in both continuous and peak with inverters).
The best way to explain it would be giving an example: a common laptop. Many traditional laptops run on 2.5 up to 4 amps depending on what brand and model of-course. Their input in voltage can be up to 12 volts. 12 volts multiplied by the ampage of the laptop (in this case let's say 2.5 amps) would be equivalent of 30 watts continuous with an equivalent of 60 watts peak. So even a smaller 400 watt inverter (800 watt peak) running on a 12V battery would be more than capable of handling just one laptop itself. You could likely run a small flat screen LCD TV along side it just fine, maybe even a lamp with a 75 watt bulb too. The bigger the inverter the more wattage they can handle, thus the more utilities they can run, or the bigger utilities they can run in moderation. Typically, to be on the safe side, running a box freezer you'd want a 2,500 watt inverter with 5,000 peak because a box freezer would use a lot heavier load with the peak typically significantly higher than the continuous wattage unlike average utilities. Same would go for electrical water pumps or air conditioners too.

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