To produce 5 litres of water a day on solar power alone, plan for a 400 to 600 Wp panel and a 100 Ah battery; for 10 to 20 litres a day (van, boat), plan for 800 to 1,500 Wp of panels and at least 200 Ah of battery.
Campervan, boat, isolated cabin, region under water stress: in all these cases, solar electricity makes it possible to run an atmospheric water generator with no grid connection at all. Here is how to size a suitable solar installation, and which models to favour for mobile use.
Why pair an atmospheric water generator with solar panels?
An atmospheric water generator asks for only one thing in order to run: electricity. Unlike a well or a mains water connection, it needs no hydraulic infrastructure whatsoever. Combined with solar panels and a battery, it becomes a fully self-sufficient system, able to produce drinking water in a remote area, during a grid outage, or in the middle of a drought like the one described in our article on the atmospheric water generator in Perpignan.
How many solar panels to power an atmospheric water generator?
The calculation starts from the unit’s electricity consumption, generally between 0.3 and 0.8 kWh per litre of water produced. A few benchmarks to size your installation:
- 5 litres/day (mobile use, 1 to 2 people): around 2.5 to 4 kWh/day → a 400 to 600 Wp panel with a 100 Ah battery is generally enough, depending on sunshine.
- 10 to 20 litres/day (van, boat, small cabin): 5 to 12 kWh/day → plan for 800 to 1,500 Wp of panels and a 200 Ah battery as a minimum.
- 30 litres/day and above (full domestic use): beyond 1,500 Wp, an installation sized by a professional becomes necessary.
These battery capacities mainly serve to smooth production at night or in overcast weather, since the generator draws more power at the start of each production cycle. As a benchmark, a photovoltaic panel in France produces between 900 and 1,450 kWh per kWp installed each year depending on the region: from 900 to 1,000 kWh/kWp in the North to 1,300-1,450 kWh/kWp in the Provence region (Selectra), a gap worth factoring in when sizing your installation for your location.
Atmospheric water generator in a campervan, boat or van: which model to choose?
For mobile use, it is better to favour the most compact models on the market, designed for 1 to 2 people (around 8 to 10 litres a day), rather than a conventional domestic unit of 20 to 40 litres a day that would be too power-hungry for an on-board solar installation. The points to check before buying for mobile use:
- Compatibility with a 12V or 24V supply (directly from the on-board battery, without an inverter)
- Weight and footprint compatible with a mobile fit-out
- Vibration resistance for use on a boat or in a van
- A built-in tank large enough to cover days with little sunshine
You will find all the criteria to check before buying in our guide to the criteria for choosing an atmospheric water generator, and a full cost breakdown in our article on the price of an atmospheric water generator.
The limits to know before going off-grid
- Humidity and temperature: production drops sharply below 15°C and 35% humidity, which limits use in the mountains or in a very dry climate.
- Battery autonomy: with no sun for several days, production can stop; plan a buffer tank or a backup source.
- Maintenance on the move: filters clog faster in mobile use (dust, sea air), so regular checks remain necessary, as detailed in our user guide.
A real autonomy solution for remote areas
Paired with solar power, the atmospheric water generator is as relevant to travellers in a van or on a boat as it is to isolated homes, farms without easy access to the grid, or areas hit by water restrictions. It is a more technical investment than a model plugged into the mains, but it offers complete independence, including during a power or water cut.
Yadlo is the independent reference website on atmospheric water generators in France — no sales, no conflict of interest, only honest information grounded in hands-on field experience.
