Budget Solar Panel Installation for Van Life
This video documents a hands-on solar installation project for a converted van, showing the builder adding a second 50-watt solar panel to his existing system. Filmed in North Yorkshire, the update focuses on the practical side of upgrading from a portable single panel to a permanent roof-mounted dual setup wired in parallel, achieving 100 watts of total solar capacity. The builder takes a budget-conscious approach, sourcing semi-flexible panels and explaining the installation process step by step.
If you're living in a van or camper van and concerned about power management during stationary periods, or if you're in the early stages of a DIY camper conversion and trying to figure out affordable ways to maintain battery charge, this project walkthrough will help you understand what's realistic to achieve and how much you might expect to spend.
Key Moments
Key Moments in the Solar Panel Installation
- Wind deflectors added to cab windows for ventilation without rain entry
- The two 50-watt semi-flexible panels secured to the roof with corner mounting and weatherproofing sealant
- Cable routing through a wiring gland down the interior to the solar controller
- Real-world performance test showing the battery topped up to 13.34 volts within one hour on a semi-sunny morning
- Cost breakdown: panels at £49 each, extension cable around £15, parallel connector approximately £14
- Battery recovery demonstration, showing charge rising from one bar to full in about an hour despite not being in direct sunlight
What to Know Before Installing Budget Solar Panels
- Panel type: Semi-flexible mono-crystalline panels are weatherproofed and designed for outdoor roof use, unlike portable alternatives
- Installation method: Panels are screwed at each corner with sealant behind every screw hole; cables are p-clipped down the entire route to prevent wind lift and water ingress
- Wiring configuration: Two 50-watt panels wired in parallel (not series) to produce a combined 100 watts without increasing voltage beyond what existing controllers can handle
- Cable routing: Cables run through a single wiring gland into the cab interior, above the headliner, and down to the existing solar controller
- Performance expectations: On a semi-sunny morning, the system recovered a fully discharged battery (one bar) to float voltage within approximately one hour
- Controller compatibility: The builder is using an affordable PWM controller; MPPT controllers are mentioned as a possible future upgrade but the current unit is performing reliably

Frequently Asked Questions About Van Solar Installations
How much power do two 50-watt solar panels actually generate?
When wired in parallel, two 50-watt panels produce a combined 100 watts of capacity. In real-world conditions on a semi-sunny morning—not full direct sunlight—the video demonstrates these panels fully charging a depleted battery within one hour, confirming the manufacturer's power ratings are accurate.
What does wiring solar panels "in parallel" mean?
Parallel wiring means connecting two panels so they share the same voltage but add their current together. In this case, two 50-watt panels in parallel maintain the same voltage as one panel but produce double the power output. A parallel connector (around £14) is used to join them safely.
How do you seal roof-mounted solar panels to prevent water leaks?
The builder uses sealant behind every mounting screw and along the front edge of each panel to block wind and prevent water ingress. P-clips secure the cables along the entire roof run, and cables enter the interior through a single wiring gland that is also sealed, eliminating paths for water to penetrate.
Can you use a cheap solar controller or should you upgrade to MPPT?
The video shows the builder using an affordable PWM controller successfully; batteries were recovered to float voltage efficiently and the controller is performing well. While MPPT controllers are more efficient and the builder considers upgrading later, he plans to continue testing the cheaper unit first before making that decision.
Will wind deflectors really help with ventilation inside a van?
Yes. The deflectors allow side windows to be cracked open at night or during hot weather without rain entering, creating airflow that reduces staleness and condensation. The builder confirmed they worked well during a hot spell, keeping the cab fresh even at outside temperatures near 30°C.
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