Van autonomy is not a fixed score: it's a dynamic review by route. Here is the full framework and the links to our specialised energy, water and safety guides.
Route autonomy = min ( energy days ; water days ; safety days covering the zone )
Overall autonomy is capped by the weakest link. Strengthening the already-strong item moves nothing.
The solar output / consumption Wh/day ratio must be > 1.2 on a seasonal average. In a Northern winter, plan for 2.5× the summer panel. Sizing and wiring details are in our guides.
Typical consumption: 9 L/person/day in frugal mode, up to 30 L/person/day with a shower. A 100 L tank for 2 people ≈ 4–5 days. A 3-stage filtration is essential off-grid.
A 12 V 50 L fridge = 5-7 days of fresh food for 2 people. Dry stock 3-4 weeks (pasta, rice, pulses, UHT milk). Full food self-sufficiency is not the point — nutritional density / weight and the resupply cadence are.
Out of mobile coverage: a satellite communicator (inReach, Zoleo) is mandatory beyond 4h of walking from the last covered point. Certified COSPAS-SARSAT SOS, no substitute.
Define the reference route
Min/max latitude, season, average duration between resupply points.
Measure real usage
Wh/day and L/day consumed in standard conditions for your profile (not the manufacturer's spec sheet).
Identify the limiting link
The pillar that fails first on the reference route. That's where the marginal investment goes.
Related read: before buying a vehicle, see the pre-purchase scoring method.
Because the same van can show an autonomy score of 75/100 on the Mediterranean coast in summer and 38/100 in the Pyrenees in winter. Autonomy is a function of route × vehicle, never an intrinsic property of the vehicle alone.
Pragmatic rule: aim for 4–6 days of off-grid autonomy, with a water point and an energy point every 3-4 days. That's enough to plan freely without stressful constraints.
Partially. Fresh food is limited to 5-7 days (40-65 L fridge), dry to 3-4 weeks. Total food self-sufficiency makes no sense in a van — aim instead for minimising stops and nutritional quality.
Calculate your autonomy review by route
The Nomad score consolidates the 4 pillars on your real route and identifies the limiting link.
Get my Nomad score