Choose an RV solar kit around how you camp, the appliances you use and the equipment already installed. Panel wattage alone cannot tell you whether a kit will keep up with your trips.
Begin with daily energy use and battery reserve. Then check roof space, solar charging, inverter output and compatibility with shore power or alternator charging. This order helps you avoid buying a larger panel array to solve a battery or inverter problem.
Build a daily energy list
Record the wattage and operating time of each load. For a cycling refrigerator, use measured daily energy or a suitable consumption estimate. Separate 12V or 24V DC equipment from AC equipment that needs an inverter.
Here is a deliberately simplified example for comparison:
| Load | Assumption | Energy per day |
|---|---|---|
| Lighting | 20W × 4 hours | 80Wh |
| Ventilation fan | 30W × 6 hours | 180Wh |
| Laptop | 60W × 3 hours | 180Wh |
| Refrigerator | Assumed daily energy | 700Wh |
| Total | Before charging and conversion losses | 1,140Wh, or 1.14kWh |
The figures are illustrative, not a typical-RV promise. Add water pumps, furnace fans, communications equipment and every other intended load. Electric cooking, water heating or air conditioning can change the requirement substantially.
Choose your reserve and charging strategy
Decide how long you want to operate without useful charging. Two days at the example’s 1.14kWh daily load require 2.28kWh delivered to appliances before allowances. Compare this with the selected battery’s usable energy rather than its category name or nominal amp-hours alone.
Then consider where you park. A campsite shaded by trees can produce a different result from an open location. Roof-mounted panels are convenient while travelling; portable panels may offer placement flexibility when parked, but introduce their own setup and storage requirements.
Estimate solar production with visible assumptions
For illustration only, a 400W array receiving four equivalent peak-sun hours with an assumed 75% overall production factor yields 400 × 4 × 0.75 = 1,200Wh per day. That is close to the example load list before considering whether the calculation adequately captures all system consumption and reserve recovery.
Four peak-sun hours and 75% are example inputs, not universal Canadian values. Location, season, shade, tilt and the actual system change the result. Use local seasonal information and leave room for the periods when charging does not keep up.
Check the existing RV equipment
- Battery chemistry, nominal voltage and permitted charging profile.
- Solar controller voltage, current and battery compatibility.
- Shore-power converter or charger settings.
- Alternator-charging equipment and vehicle requirements.
- Inverter continuous output, surge capacity and idle consumption.
- Available roof dimensions, obstructions and approved mounting method.
An RV battery swap can affect several charging sources. A lithium-compatible solar controller does not establish that the shore charger or alternator connection is suitable. Have the complete arrangement checked for the selected equipment.
Compare included components
A “solar kit” may mean panels and a controller, a battery-and-inverter package, or a broader equipment bundle. Check the itemized parts list for batteries, inverter, mounting, cables, monitoring and protection. Confirm cable lengths and any installation materials that remain site-specific.
Compare bundles against the same energy budget and equipment requirements. A high inverter rating does not create more battery energy, and adding battery capacity does not ensure the panels will recharge it during your trip.
Your next step
Compare RV and cabin solar kits. Send your requirements to ROCKSOLAR with your RV type, battery and charger models, available roof dimensions, appliance list, destinations and expected off-grid stay.
Common questions
Can a small kit run air conditioning?
Do a dedicated assessment of its running energy, startup demand and intended hours. Do not assume a kit suits air conditioning because the inverter’s headline rating appears large enough.
Should I buy more panels or more battery?
Identify the shortfall. Panels address charging opportunity; batteries address stored-energy reserve. Both need to fit the same use pattern.
