What Size Inverter Do I Need to Run a Microwave in a Van?
Running a microwave in a van is entirely feasible from a battery perspective — microwaves heat food quickly, so the total energy consumed is modest. The key is making sure your inverter can handle the peak wattage.
For inverter sizing in general: what size inverter for a van or RV? and the inverters guide.
Microwave wattage reality
The wattage printed on a microwave label (600W, 700W, 1,000W) is the cooking power — what's delivered to the food. The wall draw (what the inverter must supply) is always higher:
| Cooking power | Typical wall draw |
|---|---|
| 600W | ~900–1,000W |
| 700W | ~1,050–1,150W |
| 900W | ~1,200–1,400W |
| 1,000W | ~1,400–1,600W |
| 1,200W | ~1,600–1,900W |
Size your inverter for the wall draw, not the cooking wattage. A 1,000W cooking microwave typically needs an inverter rated for 1,500–2,000W.
Recommended inverter size
- 600–700W cooking microwave: 1,500W inverter minimum
- 900–1,000W cooking microwave: 2,000W inverter recommended
- 1,200W cooking microwave: 2,000W minimum; budget headroom for other simultaneous loads
Always pure sine wave — microwave control boards and inverters are sensitive electronics. Modified sine wave can cause interference, erratic operation, or premature failure.
Is a microwave worth it in a van?
Pros: Fast reheating of leftovers (2–3 minutes vs. 10–15 on a stovetop), useful for steaming vegetables, defrosting. Familiar cooking method.
Cons: High instantaneous draw requires a 2,000W inverter. Takes counter space or cabinet space. Induction cooking is often more versatile for actual cooking.
Many van lifers with an induction cooktop skip the microwave entirely — the induction top handles everything a microwave does, and more, with the same inverter. Others find a compact 600W microwave genuinely useful for quick reheating.
Recommended van microwave: A small, low-power model like the Toshiba EM131A5C-BS (1,100W cooking, ~$80) or the Commercial Chef 0.6 cu ft (600W cooking, ~$60) — lower wattage means more manageable wall draw and fits better in a van cabinet.