Runtime evidence · sourced load
A microwave draws 1,500 W while running. 55 stations clear the capacity, inverter, and startup checks at that load.
By the BatteryRank Engineering Team
01 · Runtime ladder
Nominal capacity × depth of discharge × inverter efficiency ÷ sourced average draw.
| Capacity class | Estimated runtime | Evidence |
|---|---|---|
| 300 Whstep 1 | 0.2 hr | Microwave (1,000W cooking power) load · 2026-07-06 |
| 500 Whstep 2 | 0.3 hr | Microwave (1,000W cooking power) load · 2026-07-06 |
| 1,000 Whstep 3 | 0.5 hr | Microwave (1,000W cooking power) load · 2026-07-06 |
| 2,000 Whstep 4 | 1 hr | Microwave (1,000W cooking power) load · 2026-07-06 |
These are comparison projections, not a promise. Temperature, inverter behavior, cycling, and the individual station's measured delivered capacity can change real runtime.
02 · Reading the numbers
The number on the front of a microwave is cooking output, not electrical input. A "1,000 W" microwave pulls about 1,500 W from the wall, because the magnetron is roughly 65% efficient at converting electricity into microwave energy. Everything about sizing follows from that gap.
Sizing to the 1,000 W badge. A 1,200 W inverter looks sufficient and is not. The reassuring half of this, though, is energy: microwaves run for minutes, so a five-minute reheat is only about 125 Wh. This is a load that is hard on the inverter and almost irrelevant to the battery.
The 1,500 W input figure is representative of a 1,000 W-output countertop unit. Your own nameplate lists the input rating directly, usually on the back or inside the door frame, and that is the number your inverter has to clear.
03 · Passing stations
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Critical-load fit
Why it fits
500 W above the plan's running load (2,000 W continuous output)
Main compromise
10,000 W below the highest output reserve across 55 eligible models
Best all-round fit
Why it fits
72 BatteryRank score — the highest of any station that fits this plan
Main compromise
7.7 points below the highest-scoring eligible model (54 of 55 eligible models have this sourced value)
Maximum useful reserve
Why it fits
111.4 projected runtime hours
Main compromise
557.1 hours less projected runtime than the longest-running eligible model across 55 eligible models
This ordered data view is separate from the three recommended buying strategies above.
Runtime uses each linked model's sourced capacity and output data; open its dossier for provenance.
Solar effect
Computed with this model's sourced solar-input limit and BatteryRank's published harvest assumptions. Check the solar method → · Model sources →
04 · Evidence record