What Size Battery Do You Need for Van Life?

Battery sizing for van life depends on how many watt-hours you consume per day and how much of the battery nameplate capacity you treat as safely usable. A Sprinter Van example shows the calculation method.

Not every van life build uses 2,000 Wh/day. The example is a planning reference, not a universal consumption claim.

Analysis

The Sprinter Van example assumes 2,000 Wh/day and a 90% usable battery fraction. Dividing daily energy by the usable fraction produces an estimated storage need of about 2,223 Wh.

At 12 V nominal, this example works out to approximately 186 Ah of nameplate battery capacity under the current sizing assumptions. The same watt-hour requirement would represent fewer amp-hours at higher nominal voltage.

Usable battery fraction reflects the practice of not fully depleting a pack on a typical cycle. Lithium and lead-acid systems differ in practice, but the example uses one documented fraction for planning consistency.

The EcoFlow DELTA 3 Ultra Plus is shown as a capacity comparison example with 3,072 Wh listed. That value exceeds the 2,223 Wh estimate for this example by about 849 Wh, but it is not presented as an automatic recommendation for every van build.