Van Life Inverter Sizing for Real Builds (2026)
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Van life inverter sizing is where a lot of builds go wrong in one of two directions: too small to run the microwave, or so large it drains the battery just idling. This guide sizes the inverter to what you actually run, and — the part people miss — checks that your battery can even feed it.
The short answer
Size the inverter to your largest simultaneous AC load plus surge headroom. Most vans are well served by 2,000 W; minimalist builds by 1,000–1,200 W; those running an induction hob and high-draw tools by 3,000 W. Then confirm your battery’s BMS can supply the current the inverter demands.
Add up your real simultaneous load
Inverter sizing is not about total appliances — it is about the most you run at the same instant. List what could plausibly be on together at the worst moment, and total their running watts. Add a margin for the surge when motors and compressors start.
| Appliance | Running watts | Surge |
|---|---|---|
| Laptop | 60 | — |
| Induction hob | 1,500 | 1,800 |
| Microwave (900W rated) | 1,300 | 1,500 |
| Coffee maker | 1,000 | — |
| Power tools (drill/grinder) | 700–1,200 | 2,000+ |
Notice that single high-draw appliances — induction hob, microwave, kettle — are what set your inverter size, not the sum of small electronics. Most vans never run two 1,500 W appliances at once, so sizing for the largest single one plus a little headroom is usually right.
The constraint people forget: battery current
An inverter can only deliver what the battery can supply. At 12V, a 2,000 W inverter pulls about 175 A from the battery; a 3,000 W inverter about 260 A. Your battery’s BMS has a continuous discharge limit, and if the inverter’s demand exceeds it, the BMS shuts down under load.
Many 100 Ah LiFePO4 batteries cap continuous discharge at 100 A — enough for a 1,000 W inverter, not a 2,000 W one. Running a big inverter often forces a bigger battery or two in parallel regardless of your energy needs. Check the limit against the battery sizing guide, and consider going to 24V, which halves the current — see watts vs volts vs amps.
Sizing by build type
| Build | Inverter | Min battery (12V) |
|---|---|---|
| Minimalist (laptops, charging) | 1,000–1,200 W | 100 Ah |
| Typical (occasional microwave) | 2,000 W | 200 Ah |
| Full electric (induction, tools) | 3,000 W | 300 Ah or 24V |
Do not oversize for its own sake
A bigger inverter is not a free upgrade. Larger units draw more idle current just being switched on — often 10–25 W around the clock — which quietly drains your battery when nothing is even plugged in. They also demand heavier, costlier cable and a higher battery discharge limit.
Size to real use, not to a round number that feels safe. And switch the inverter off at the unit when you do not need AC, especially overnight. Selection, wiring and fusing are covered in the inverter installation guide; if yours keeps cutting out, see inverter tripping causes and fixes. Electrical standards are maintained by the National Fire Protection Association.
Frequently asked questions
What size inverter for van life?
Most vans land on 2,000 W, which handles a microwave or induction hob run one at a time. Minimalist builds that only charge electronics can use 1,000–1,200 W. Only go to 3,000 W if you genuinely run high-draw appliances, and pair it with a battery that can supply the current.
Why does my inverter drain the battery when nothing is plugged in?
Inverters consume idle current just being powered on, and larger units consume more. Left on overnight, a big inverter can quietly use a meaningful share of a small battery. Switch it off at the unit when you do not need AC.
Can my battery actually run a 2,000W inverter?
Only if its BMS allows the roughly 175 A that a 2,000 W inverter pulls at 12V. Many 100 Ah batteries cap at 100 A, so you would need a larger battery, two in parallel, or a 24V system. Always check the discharge limit, not just the capacity.
Should I go 12V or 24V for a big inverter?
For inverters above about 2,000 W, 24V is worth serious consideration — it halves the current for the same power, easing the load on the battery, BMS and cabling. Small 12V builds are simpler; large power-hungry builds benefit from higher voltage.
Last updated: July 22, 2026. Always check your battery’s continuous discharge limit against the inverter’s current draw before buying.
