«Self-sufficient» is the camper world's favourite dream word, and one of the most misunderstood. Self-sufficiency is not a kit list but a calculation with three items: power, water, toilet. If you do the maths honestly, you can stay independent for days. If you guess, you are sitting in the dark on the second evening.
Power: count first, then buy
The classic mistake is to start with the size of the solar panel. The right way round is the other way: list your devices (cool box, lights, phones, laptop, parking heater), add up the watt hours per day, then size your battery and solar. As a rough guide for a couple without big power users: a 100 Ah lithium battery plus 150 to 200 watts of solar will get you through the summer season; if you plan days working on a laptop or winter trips, be more generous. And: the charging booster that fills the battery while you drive is the most underrated component of the whole system.
Water: 10 litres per person per day
With cooking, washing up and a quick wash, a frugal person uses around ten litres a day, so a 40-litre tank lasts two people about two days. More important than a big tank is your refill strategy: cemeteries, motorway service areas and hosts with a water connection are the supply network of the camper world. Grey water obviously goes to a disposal point, never onto the roadside.
Toilet: the dry separating revolution
Among self-builders, the dry separating toilet has become the standard: odour-free, chemical-free, and the biggest gain in freedom of all. With a toilet on board, you are completely flexible in choosing where to stay and leave nothing behind outdoors. Dispose of solids as compost, liquids heavily diluted or into the sewer, done.
🔋 Self-sufficient does not mean homeless: even with everything on board, you need a legal place to spend the night. The combination of a self-sufficient vehicle and a farm pitch without facilities is unbeatably cheap, and completely independent.
Background research including the roadsurfer blog and guides from TCS, VanSite and other camping magazines; text and analysis: Parkn'Sleep editorial team.
