Short answer: Boat solar panel installation cost for a 400 W rigid-panel system with an MPPT controller typically runs about $1,300–$3,100 installed in 2026: roughly $480 in panels, $135–$160 for a Victron SmartSolar MPPT 100/30, $100–$300 in wiring and fusing, and 4–10 hours of labor. Custom arches and frames cost extra.
Long Beach Marine Electric connects boat owners with marine electricians who install solar, and this guide prices out typical boat solar panel installation cost for a 400-watt system, the most common size for boats that sit on moorings, anchor out or live aboard. Parts prices are published 2026 retail. Labor is at Long Beach rates of $140–$200 per hour. Treat the totals as estimates. Mounting is the big variable.
A 400 W system, priced out
| Item | Basis | Estimate |
|---|---|---|
| Panels: 4 × 100 W rigid | ~$120 each retail | ~$480 |
| MPPT controller | Victron SmartSolar MPPT 100/30, ~$135–$160 | ~$135–$160 |
| Wiring, fuses, connectors, deck gland | PV wire, MC4 connectors, fuses | $100–$300 |
| Standard mounts | Rail or bracket mounts | $50–$200 |
| Labor | 4–10 hrs at $140–$200 | $560–$2,000 |
| Estimated total | ~$1,300–$3,100 |
A custom stainless arch or hardtop frame is a separate fabrication job and often costs more than the solar system itself.
What you get for it
Solar.com models a well-oriented array in Long Beach at about 1,674 kWh per kW per year, roughly 4.6 kWh per kW per day even with the coastal marine layer. Four hundred watts works out to about 1.8 kWh a day, close to 150 amp-hours at 12 volts before losses. Boat panels are usually flat and partly shaded by booms, masts or radar, so plan on 50–70% of that. That’s still enough to keep a mooring boat’s batteries and bilge pump covered, or to replace a night’s anchor light, instruments and fridge.
Where the money goes
- Shade survey and layout. A shaded panel can drag down a whole string, so placement matters more than wattage.
- Deck penetrations. Sealed cable glands keep water out of the deck core.
- Wire sizing. PV wiring is sized for low loss and fused at the battery.
- Controller set-up. The MPPT controller’s profile is set to your battery chemistry, especially important with lithium.
Rigid vs flexible
Rigid panels on an arch, hardtop or rail mounts last longest and stay cooler. Semi-flexible panels suit biminis and curved surfaces and are lighter, but they usually cost more per watt and age faster in Southern California sun.
Bottom line
Budget about $1,300–$3,100 installed for a 400 W rigid system, plus fabrication if you need an arch. Start with an energy budget of what runs while you’re away from shore power. See marine solar panel installation or call (562) 374-7233 for a same-day callback.
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