Solar panel prices have dropped roughly 80% in the last decade. What used to cost $2,000+ for a van setup now costs $200-400. The technology is mature, reliable, and the brand differences matter less than you think.
Get 200-400W of rigid monocrystalline panels from any reputable budget brand. Don't overthink it - a $100 panel produces the same electricity as a $250 panel with the same specs.
This depends entirely on your power usage. If you haven't already, do a power audit first. But here are rough guidelines:
Important: Solar is only half the equation. If you also have a DC-DC charger (and you should), you can often get away with less solar because driving recharges your batteries too. Most people with a DC-DC charger and 200W of solar have more than enough.
This is your main decision. Both are monocrystalline (the cell type that matters), but the form factor is very different.
Unless you have a specific reason to go flexible (stealth, height clearance for parking garages), rigid panels are the better value. They last 5-10x longer and perform better in hot weather. The "easier installation" of flexible panels doesn't make up for replacing them every few years.
Most van solar panels are either nominally "12V" (actually ~18-22V open circuit) or "24V" (~36-44V open circuit). Either works fine with an MPPT charge controller, which handles the voltage conversion.
If running panels in series (positive to negative), higher total voltage means less current, which means you can use thinner wire from roof to controller. This matters more for longer wire runs.
Series (daisy chain)
Adds voltage, same amps. Better for long wire runs. But if one panel is shaded, the whole string drops.
Parallel (each panel direct)
Same voltage, adds amps. Shading one panel doesn't affect others. Needs thicker wire.
For most vans: 2 panels in series works great. If you have partial shading issues (roof rack, vent fan shadow), parallel is more forgiving.
Roof space reality check: A typical van roof (Sprinter, Transit, ProMaster) fits 2-4 rigid panels depending on what else is up there (vent fan, AC unit, roof rack). Measure your available space before buying.
Here's the thing about solar panels: they're a commodity product. The solar cells inside a $100 panel and a $250 panel are often made in the same factories. The brand premium mostly pays for marketing, packaging, and customer support you'll probably never need.
Renogy, Vevor - Renogy is the most popular in the van community, but Vevor panels are often $20-40 cheaper for identical specs. Any of these will last 20+ years.
A 200W rigid monocrystalline panel runs $80-150 from these brands. Two panels (400W total) will cost $160-300.
Many brands sell "complete solar kits" bundled with a cheap PWM charge controller and thin wiring. You're better off buying the panel separately and pairing it with a proper MPPT charge controller - you'll get 20-30% more power from the same panels.
Your panels will almost never produce their rated wattage. A "200W" panel produces 200W under perfect lab conditions (direct sunlight, 25°C, optimal angle). In real life:
Multiply your panel wattage by 4 to estimate daily watt-hours in decent sun. So 200W of solar ≈ 800Wh/day, 400W ≈ 1600Wh/day. This is conservative but realistic for flat-mounted van panels.
Rigid panels mount to your roof with Z-brackets or L-brackets and self-tapping screws (with sealant). Leave a 1-2" gap between the panel and roof for airflow - this keeps the panel cooler and more efficient.
You need to run wires from the panels through the roof to your charge controller inside. Use a weatherproof cable entry plate (also called a gland box) - these cost $5-10 and create a sealed pass-through. Apply Dicor self-leveling sealant around it.
Use appropriately sized solar wire (usually 10 AWG for runs under 20 feet at 200-400W). MC4 connectors are standard - they're waterproof and snap together. Run the wire to your charge controller, which then connects to your battery.
For most van builds: Get 2x 200W rigid monocrystalline panels ($160-300 total) from any budget brand. Pair with an MPPT charge controller. Done.
Combined with a DC-DC charger for driving, this gives most people more power than they'll ever need. Solar technology is mature and reliable - don't overthink the brand.