By Ian A., Trade Connectors
If you're converting your own van rather than buying a finished conversion, the single biggest electrical mistake isn't a wiring diagram error — it's building your solar and battery connections as one fixed, hard-wired system when your build is actually going to change over the next two or three years. Self-converters rarely finish a van and leave it alone: you add a second battery, swap a rigid roof panel for a portable one for pitches with shade, upgrade your inverter, or sell the van on and the buyer wants to see the electrics separately. Every one of those jobs is quick and safe if your solar and battery connections go through Anderson connectors (the same SB50/SB175 style connectors used across solar, marine and 4x4 recovery kit) rather than permanent terminal blocks or soldered joins. You unplug, swap, test and replug in seconds, with no risk of shorting a live battery bank while you work. It costs a little more time to plan than just running cable straight to a fuse box, but it means the next change to your build — and for a self-converted van, there will be a next change — is a five-minute job instead of a rewire.
Why this matters more for a self-build than a factory conversion
A factory-built campervan or motorhome is designed once and, mostly, stays as it left the factory. A self-converted van isn't like that. It gets built in stages — often over a winter, often on a budget, often with the electrics being the last thing finished before a first trip. That means the system you wire in March is rarely the system you're still running two years later: you find the single 100W panel isn't enough once you're running a fridge and a laptop, so you add a second; you discover your fixed roof panel is next to useless parked under trees, so you buy a portable/suitcase panel for those pitches; you upgrade a battery bank from a single leisure battery to a proper lithium setup.
None of that is a problem if your original wiring was planned with disconnection points built in. It's a real problem if it wasn't — because then "adding a panel" means getting back into a fuse box you sealed up eighteen months ago, on a system that's still live, with connections you may not remember the exact spec of.
Where Anderson connectors actually earn their keep
Anderson connectors (Power Products' SB50 and SB175 series, and compatible genuine housings) are genderless, colour-and-size-coded so you can't mismatch amperages, and rated for the kind of repeated connect/disconnect cycles that a fixed screw terminal was never designed for. In a self-converted van's electrical setup, that's useful in three specific places:
Between your solar panel(s) and your charge controller. Whether you've got a fixed roof panel, a portable suitcase panel, or both, running an Anderson connector at the point where the panel cable enters the van means you can unplug a roof panel entirely for a service, or swap between roof and portable panels depending on where you're parked, without touching a screwdriver.
Between your leisure battery bank and the rest of the system. If there's any chance you'll upgrade your battery bank later — and for most self-converters there is — wiring the bank through an Anderson connector means the upgrade is an unplug-and-replug job, not a full rewire, and you can isolate the whole bank instantly if you need to work on anything downstream.
At any point you might want to test, tow, or hand the van over. Recovery and 4x4 owners have used Anderson connectors for exactly this reason for years — a single genuinely-rated connector that isolates a live circuit safely, cleanly, and without tools. The same logic applies to a habitation electrical system: it's not just convenient, it's a safer way to work on your own van.
Genuine connectors matter here, not just “an Anderson-style plug”
This is worth being blunt about, because it's the mistake we see most often in cables that come back to us for advice: a cheap import Anderson-style connector with thin, poorly-plated contacts will get warm under load, and a housing that doesn't seat squarely will let contacts arc slightly on every connect. On a system you're only plugging in once a year, that's a nuisance. On a system you're deliberately building to be reconfigured — which is the entire point of using Anderson connectors on a self-build — it's a genuine fire and reliability risk, because you're relying on that connection to perform the same every single time you unplug and replug it. Genuine Anderson Power Products housings, hand-crimped onto proper BS638 British copper cable rather than crimped onto whatever's cheapest, are what make the "unplug and reconfigure" approach actually safe to rely on rather than just convenient.
What to fit if you're wiring a build now
If you're at the planning stage: put an SB50 (50A) connector between your battery bank and your main fuse/distribution point, and between your solar input and your charge controller, from our Leisure & Solar range. If you're running a larger inverter or a bigger lithium bank, size up to SB175. Either way, plan the disconnect points before you close up any panels — it's far easier to leave a connector accessible during the build than to retrofit one once the van's finished.
FAQs
Do I need a qualified electrician to wire my self-converted van's solar and battery system?
There's no legal requirement for a qualified electrician to sign off a habitation 12V/24V system in a self-converted van the way there is for a UK household mains installation, but that doesn't mean competence doesn't matter — a poorly wired leisure battery system is a genuine fire risk. If you're not confident with crimping, fusing, and cable sizing, it's worth getting a competent installer to check your work, or at minimum having someone experienced review it before your first trip.
What's the actual difference between an Anderson connector and an MC4 connector for van solar?
MC4 connectors are the solar industry's standard for panel-to-panel and panel-to-cable connections and are what most solar panels ship with. Anderson connectors are a more general-purpose high-current connector used across solar, marine, and vehicle recovery applications, and are better suited to the battery and distribution side of your system where you want a single connector type across solar input, battery bank, and accessories. Many self-converters run MC4 at the panel itself and adapt to Anderson at the point the cable enters the van — that's a sensible way to get MC4's weatherproofing at the panel and Anderson's flexibility everywhere else.
Can I use a portable or "suitcase" solar panel with an Anderson connector setup?
Yes — this is one of the more common reasons self-converters move to Anderson connectors in the first place. Fit a weatherproof Anderson panel mount or gland at the point the cable enters the van, and you can unplug a fixed roof panel and plug in a portable panel (or run both) without any rewiring.
Why shouldn't I just use a cheap Anderson-style connector from a general auto parts listing?
Cheap imports often use thinner-gauge contacts and lower-grade plating, and the housings frequently don't seat as squarely as genuine Anderson Power Products parts. On a connector you're deliberately going to unplug and replug repeatedly as your build evolves, that's exactly where a poor connection shows up — as heat, resistance, or an intermittent connection you won't notice until something fails.
Should I fit SB50 or SB175 connectors on my van build?
SB50 (50A continuous) covers the vast majority of single-panel, single-battery-bank campervan setups. Step up to SB175 if you're running a larger inverter, a bigger lithium bank, or you know you'll be scaling up the system significantly — it's easier to size up once at the planning stage than to replace connectors later.
What happens to my Anderson connector setup if I sell the van or hand it to someone else to finish?
This is one of the underrated benefits: a system wired through clearly labelled Anderson connectors is far easier for a new owner, or another installer, to understand, isolate, and safely work on than a system that's all fixed terminals and inline joins. It's a small thing that makes a self-converted van's electrics much less of a mystery to whoever inherits them.