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Know How
Know how guides for vehicle electrical installations — free technical references written from engineering experience, not assembled from other people’s guides
Low-voltage DC electrical systems are not complicated in principle. They become complicated when the wrong cable gets used, the wrong connector gets specified, or a system that worked fine on day one starts misbehaving six months later because nobody thought about what happens when it flexes, heats up, or gets wet.
These documents exist because good information should be free and easy to find. They cover the practical detail that gets skipped in most YouTube tutorials and glossed over in most product listings. Read them on screen or download them. Share them if they’re useful. If something in them raises a question about your specific build or installation, the next step is simple — talk to us.
All documents are free to download. No registration required.
Ampacity Ready Reckoner
Current carrying capacity tables for automotive cable across four insulation types and three ambient temperatures, with resistance data for volt drop calculation. The definitive reference for cable sizing decisions.
Heat Shrink Sizing Guide
Cable OD to heat shrink sizing tables for metric and AWG cable in 2:1, 3:1 and 4:1 ratios, in both metric and imperial heat shrink sizes. Because guessing the right size wastes more time than looking it up.
Cable Sizing Guide — 12V Systems
Quick-reference cable sizes for common leisure vehicle and campervan applications, with a current rating table, volt drop guidance and application notes. For 12V DC systems.
Cable Sizing Guide — 24V Systems
Cable sizing reference for plant, agricultural machinery, LGV and PCV applications. For 24V DC systems — where half the current means smaller cable, less volt drop and less heat.
Cable Sizing Guide — 48V Systems
Cable sizing reference for emerging 48V DC architectures in leisure vehicles and light commercial applications. Read the caveats before you start — but the engineering case is compelling.
Cable Construction
Conductor classes, stranding types, tri-rated cable, AC cable for leisure vehicles, and why the cross-sectional area figure only tells you part of the story. Why the wrong cable is a fault waiting to happen.
Cable Management
Tesa tape grades, PET braid, nylon net sleeving, thermal foil wrap, space taping and split convoluted conduit. When to use each, where each fails, and why cable ties alone are not a cable management strategy.
More guides coming. The Know How section grows as questions come in and as the engineering work behind Voltforge produces content worth publishing. If there’s a topic you’d like to see covered, get in touch and tell us — we’d rather cover what’s actually useful than what looks good on a contents page.
Tell us what you’re building and where you’re stuck.
Sometimes the right answer is a product. Sometimes it’s a five-minute conversation that saves you a day of second-guessing.
Get in touch →
Sometimes the right answer is a product. Sometimes it’s a five-minute conversation that saves you a day of second-guessing.
Get in touch →