Solar provides independence when the system matches the way you travel. Summer weekend trips have different needs from long autumn stops in Ireland. A panel's rated output is achieved only in specific conditions, so allow for weather, shading and the angle of sunlight.
Measure consumption instead of guessing
Record the consumption of the fridge, heating, lights, pumps, chargers and electronics over several days. A watt-hour figure is a better starting point than saying you need 200 W of solar. Then consider how much energy driving restores and how often you use a 230 V hook-up.
A panel does not produce its rated power all day. On an overcast winter day, its yield may be a small fraction of the summer maximum. A good system has a reserve and does not depend on one ideal scenario.
Inspect the roof like a designer
Measure clear space around skylights, vents, antennas, racks and areas needed for maintenance. Consider shadows from roof fittings. Even partial shade can noticeably reduce panel output.
Planning the cable route before drilling avoids later compromises. Position the roof entry where it can be reached from inside, properly prepared, sealed and inspected periodically.
Fixed or portable panels?
Roof-mounted panel
It works without being set up and charges while parked. It needs no luggage space. However, its position is fixed, so parking in shade also puts the panel in shade.
Portable panel
You can place it in sunlight while keeping the camper somewhere cooler. It needs setting up, protection against wind and theft, and storage during travel. Combining fixed and portable panels works well for many people.
MPPT controller and voltage
The controller sits between the panels and battery. It must handle the maximum open-circuit panel voltage with allowance for cold conditions, and provide appropriate charging current. Series or parallel wiring changes voltage, current and performance under shade.
Match the charging profile to the battery chemistry. LiFePO4 settings differ from typical lead-acid settings. Check your battery manufacturer's recommendations instead of copying voltages from an unrelated video.
Wiring, protection and inspection
Cable cross-section depends on current, cable length and allowable voltage drop. Fuses protect cables and, where required, belong as close as practical to the energy source. Outdoor connectors must suit the environment and be correctly crimped.
After installation, check voltages, energy flow and connection temperatures under load. Inspect mountings and watertightness after the first trip and regularly thereafter.
How do we assess performance?
We consider more than the highest momentary reading. Daily energy yield, behaviour in clouds and shade, and whether the system replaces actual consumption all matter. Compare controller-app figures with the battery's state of charge.
Watch our installation and first measurements
The film shows a real weekend, installation and initial observations. One test day is not a final verdict; an installation needs assessment over time and in different conditions.