The cost of an RV solar power system ranges from $200 from a barebones 100W solar suitcase to $10,000+ for a custom off-grid motorhome.

On average, adding an auxiliary 200W solar charging system to your RV will cost about $800 in materials. Estimate twice that ($1,600) for a professional installation.

As systems get larger, the price of the “solar power system” itself becomes a much smaller piece of the pie. You’ll spend far more on the inverter and batteries than on the solar panels themselves. 

• Lithium batteries are the most expensive, but allow you to utilize almost 100% of the battery before requiring a recharge, meaning you also get more bang for your buck. They are also incredibly lightweight, but they can’t be recharged in freezing temperatures.
• Flooded lead-acid batteries are the cheapest option, but they are also the most likely to need maintenance. They shouldn’t be discharged past 50% state-of-charge.
• AGM batteries have a cheaper initial cost than lithium, but don’t last as long, making them more expensive in the long run. They also shouldn’t be discharged past 50% state-of-charge.