I'm looking to buy an inverter generator for backup of a few essential devices during power outages. I've already tested for & calculated my required wattage (including starting wattage where applicable). Still, I'm debating over size:
On one hand, buying a higher wattage generator would give me more leeway to add additional appliances in the future if desired. But on the other, if I don't end up needing the extra wattage, it would consume more fuel & therefore effectively shorten my "off-grid" time limit (given a fixed stockpile of propane).
...Or would it? This is my actual question:
Given the same load, would a higher-wattage INVERTER generator burn more or less fuel per hour than a lower-wattage one? For instance, let's say I run a load of exactly 1000 watts. Will a 4000-watt inverter generator burn more fuel per hour than a 3000-watt inverter generator on a 1000-watt load?
On one hand, it seems like the bigger one might burn more due to it having a physically larger engine. But on the other hand, it seems like the bigger one might burn less, as it's farther away from its max output & can therefore throttle down & work less hard. I've asked a couple manufacturers and searched around online, and have gotten conflicting answers.