Do different size inverters pull the same wattage

1500-2000 seams to be the normal range. But I can pickup a 4000 watt sine wave at a pretty good cost.
Always nice to have that horse power when you need it; like pulling a 4 bottom plow

If i have indentical power draw from each inverter, do they use the same amount of wattage from the battery despite the difference in power

Remember I'm trying to conserve power

You'll have about 2x the overhead/standby power draw from the 4kw than the 2kw, then any variances in efficiency, but assuming equal efficiency and equal loads, the 4kw will draw about 20w more give or take.

Rednecktek said:

You'll have about 2x the overhead/standby power draw from the 4kw than the 2kw, then any variances in efficiency, but assuming equal efficiency and equal loads, the 4kw will draw about 20w more give or take.

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So if my wife has a cpap then buy a 2000/1500 watt inverter to reserve power, correct?

A CPAP usually doesn't need anywhere that much power and may have a DC plug for it bypassing the inverter all together. You should be able to find a sticker on the wall wart or bottom of the machine that will tell you how much you need, something like 100-250v, 1.5a or 120v, 0.5a or the like.

crowTrobot said:

So if my wife has a cpap then buy a 2000/1500 watt inverter to reserve power, correct?

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My wife and I shared a 12V AGM battery with a float charger for a decade or so on both of our CPAPs, with nary a problem. It would take us a week to figure out that someone had unplugged the float charger. The spec on the bottom of them is 6.67 A at 12 V DC, but that’s worst case with the humidifier and the heated hose and everything running at full blast, I would measure the actual power consumption before I got too concerned about it.