Who is responsible for this

Volt & Grain publishes calculators and reference tables for the two systems that cause the most expensive mistakes in a vehicle build: the 12 volt electrics and the plywood. It is written for people renovating RVs, campers, vans, boats and small off‑grid spaces.

It exists because of a specific gap. Most build references pick one unit system and convert everything into it. That is fine for a length and wrong for a material. A sheet sold as three quarters of an inch is 18.26 mm, a metric 18 mm sheet is 18 mm, and a 4 AWG cable is not a 25 mm² cable. Converting between them produces numbers that look right and do not fit. Everything here carries both systems and names the gap where one exists.

Luke Moulton runs the site and writes everything on it. I am a product manager who builds things out of plywood and wires them up, not a licensed electrician, a cabinetmaker or an RV technician.

That matters, so it is stated plainly rather than buried. The authority on this site is in the method, not in a trade ticket. Nothing here rests on "trust me". Every number is either produced by a formula that is written out on the page where it is used, or it is a fact taken from a named source that is linked so you can check it. Where the honest answer is that it depends on your local wiring rules or your specific vehicle, the page says that instead of guessing.

If you want the full version of how the figures are derived, which standards they lean on, and where the calculators deliberately stop short, that is on the methodology page.

At the moment, it does not. There are no advertisements, no affiliate links, no sponsored posts and nothing for sale. When a guide names a product it is naming an example of a category, and no one has paid for the mention.

The long-term intention is to sell replacement cabinetry, which would be disclosed clearly and would not change what the calculators tell you. If that ever happens, this section gets rewritten before the first thing is listed, not after.

• It is not a substitute for an electrician. Wiring rules are jurisdictional and a calculator cannot know yours. The wire size tool sizes a conductor for voltage drop and checks it against a current rating. Signing off an installation is a different job.
• It does not carry vehicle-specific interior dimensions. Publishing measurements nobody has taken would be the fastest way to make this site useless. If a figure is not measured or sourced, it is not here.
• The diagrams are diagrams. The illustrations in the guides explain a concept. They are not photographs and they deliberately carry no dimensions, because a drawing that looks precise and is not would be worse than no drawing. Anything with numbers on it is generated from the underlying data.

If something here is wrong, I want to know, and a specific correction is more useful than a general complaint. Tell me which page, which figure, and what it should be, ideally with a source.

[email protected]

Corrections that change a number get made and the page's updated date changes with them. The publication date stays, so you can see when a page was written as well as when it was last touched.