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Embed the solar calculator

If you write about van builds, run a conversion business, or moderate a forum where "how much solar do I need?" comes up every week, you are welcome to put this calculator directly on your own page. It is free, there is no signup or API key, and there never will be a charge.

Copy this

<iframe src="https://vansolarcalc.com/" width="100%" height="900"
  style="border:1px solid #e2e8f0;border-radius:12px"
  title="Van &amp; RV solar calculator by VanSolarCalc"
  loading="lazy"></iframe>
<p><a href="https://vansolarcalc.com/">Van &amp; RV solar calculator</a> by VanSolarCalc</p>

The only condition

Keep the credit line. That link is the entire price of using this — it is how people find the tool, and it is what makes maintaining it worthwhile. You are free to reword the text, but please leave it as a normal followable link rather than adding nofollow.

Sizing it

The calculator is mobile-first and fills whatever width you give it, so width="100%" is almost always right. Height is the part worth adjusting: 900px suits most desktop layouts, but if your template is narrow the controls stack vertically and you may want 1100–1300px to avoid an inner scrollbar. Set it once against your own theme and it will be fine on phones too.

Keep loading="lazy". It stops the embed competing with your own page for bandwidth, which matters for your Core Web Vitals, not ours.

Embedding a specific build

The calculator stores its entire state in the URL. Set up a build on the calculator page, press Copy share link, and use that URL as the iframe src — your readers then land on that exact configuration instead of an empty form. This works well in a post about a particular conversion: show the numbers for the van you are writing about, and let readers adjust from there.

The Embed button under the calculator generates this snippet for you, pre-filled with whatever you have entered.

What it will size

Solar array, battery bank, charge controller, inverter, battery-to-inverter cable and fuse, plus a cost estimate and a printable parts list. The method is documented on the about page — ABYC E-11 ampacity, a 3% voltage-drop limit on the round-trip run, a 0.75 solar derate, and 0.8 depth of discharge for LiFePO4. Nothing is hidden and no result steers toward a brand.

Prefer to link instead?

An ordinary link is just as welcome. The pages people find most useful are the calculator, battery sizing, component sizing, and the van-specific pages for Sprinter, Transit, ProMaster, skoolie and truck-camper builds.

Questions

If the embed does not fit your layout, or you want a variant that starts on a particular tab, email hello@vansolarcalc.com and it will get sorted.