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Homesteading & Micro-Gardening

Van Build Solar Panel & Lithium Battery Size Calculator

Panel W ≈ Wh ÷ sun hours; Ah ≈ Wh ÷ (12V × efficiency).

Size solar watts and Ah battery bank from daily Wh load. Planning estimates only — verify measurements independently.

Inputs

50010000
28

Smart analysis

Recommendations

Tailored to your live inputs and result—guidance only, not professional advice.

  • Interpret

    Treat this as a planning estimate

    Primary result: Solar array (approx.) = 480 W. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.

Scenario studio

Compare A vs B

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Scenario A

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Scenario B

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Plain-English guide

Terms & how it works

Confused by a field? Read the short definitions here while you use the tool.

  • Daily load (Wh)

    The “Daily load (Wh)” value used in this tool’s formula. Adjust it to see results update live.

  • Peak sun hours

    The “Peak sun hours” value used in this tool’s formula. Adjust it to see results update live.

How this calculator works

Size solar watts and Ah battery bank from daily Wh load. Planning estimates only — verify measurements independently. Panel W ≈ Wh ÷ sun hours; Ah ≈ Wh ÷ (12V × efficiency). Example: 2,400 Wh/day, 5 sun hours → ~480 W solar, ~235 Ah @ 12V (est.).

Panel W ≈ Wh ÷ sun hours; Ah ≈ Wh ÷ (12V × efficiency).

Example: 2,400 Wh/day, 5 sun hours → ~480 W solar, ~235 Ah @ 12V (est.).

When to use this Vanlife Solar & Battery

Common use cases

  • Size solar watts and Ah battery bank from daily Wh load.
  • Sanity-check with this case: 2,400 Wh/day, 5 sun hours → ~480 W solar, ~235 Ah @ 12V (est.).
  • The relationship is: Panel W ≈ Wh ÷ sun hours; Ah ≈ Wh ÷ (12V × efficiency).

Localized examples

  • Homesteading & Micro-Gardening: the example on this page uses the same formula as the widget.

What you get

  • Fields: Daily load (Wh), Peak sun hours
  • Panel W ≈ Wh ÷ sun hours; Ah ≈ Wh ÷ (12V × efficiency).
  • Example on the page: 2,400 Wh/day, 5 sun hours → ~480 W solar, ~235 Ah @ 12V (est.).

How to Calculate Vanlife Solar & Battery Step-by-Step

  1. 1Enter Daily load (Wh), Peak sun hours. Use the values you have, not a catalog average, unless that is all you know.
  2. 2Panel W ≈ Wh ÷ sun hours; Ah ≈ Wh ÷ (12V × efficiency).
  3. 3Worked case: 2,400 Wh/day, 5 sun hours → ~480 W solar, ~235 Ah @ 12V (est.).
  4. 4Order a little extra. Resin, fabric, and clay do not read a spreadsheet.

Governing formula

Panel W ≈ Wh ÷ sun hours; Ah ≈ Wh ÷ (12V × efficiency).

2,400 Wh/day, 5 sun hours → ~480 W solar, ~235 Ah @ 12V (est.).

Example: set Daily load (Wh) = 2,400, Peak sun hours = 5, then read the result.

Variable definitions

  • dailyWh

    Daily load (Wh)

    The “Daily load (Wh)” field. Default 2400; typical range 500–10000.

  • peakSunHours

    Peak sun hours

    The “Peak sun hours” field. Default 5; typical range 2–8.

  • Volume math (Panel W ≈ Wh ÷ sun hours; Ah ≈ Wh ÷ (12V × efficiency).) does not include your waste, test pour, or the batch that cures wrong. Add a buffer.
  • Nothing here is uploaded for the calculation itself.

Frequently Asked Questions

Panel W ≈ Wh ÷ sun hours; Ah ≈ Wh ÷ (12V × efficiency).

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Community

Reviews & Ratings

See what others think about this tool, then leave your own rating to help improve CalculioHub.

4.8

out of 5.0

4 reviews

Leave a review

Your rating

Aisha K.

Mar 12, 2026

Clean layout and the results update instantly. Exactly what I needed for a quick planning check.

Daniel R.

Feb 28, 2026

Very usable on mobile. Would love a save/export option later, but the math feels solid.

Priya S.

Feb 3, 2026

The FAQ section answered my questions before I even had to search. Smooth dark mode too.

Marcus L.

Jan 19, 2026

Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.

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