RV Solar Cost Calculator: Estimate Your System Price

A 400W RV solar system with 200Ah of lithium costs about $1,200 to $1,600, and a full time 600 to 800W system runs $2,000 to $3,500.

As a sourced example, according to store listings checked October 2026, Renogy prices its 400W 12V kit with a Rover 40A MPPT controller at $639.99 and LiTime prices its 12V 100Ah battery at $335.99.

So the kit plus two batteries comes to about $1,312 before an inverter.

A large system that runs heavy loads off grid costs much more, driven mostly by the battery bank.

The biggest factors are how much power you use each day and how many days of backup you want.

Panels, a charge controller, wiring, and the battery bank make up the cost, and the battery is usually the largest piece.

Lithium batteries cost more upfront than lead acid but last far longer, which changes the long term math. The lithium battery options.

Start with your daily energy use in watt hours, divide by your peak sun hours to size the panels, and size the battery for your backup days.

Multiply each by a current price per watt and per watt hour to get a rough total.

For frequent boondockers, solar pays back over time by replacing campground fees and generator fuel with quiet, free power.

For travelers who mostly use hookups, a smaller system or none at all may make more sense. The full payback analysis.

The battery bank stores all of your overnight and cloudy day power, so it scales with how many days of backup you want.

Lithium storage costs more per watt hour than panels, which is why adding backup days moves the total more than adding panels.

The calculator sizes the battery for your backup days and depth of discharge to reflect this.

No. The estimate covers panels and the battery bank only, since those drive most of the cost and vary most by system size.

The charge controller, wiring, fuses, mounting hardware, and any install labor are separate.

Budget extra for those once you have your panel and battery numbers.

Most of the United States averages four to six peak sun hours, so five is a reasonable starting point.

The Desert Southwest runs higher, while the Pacific Northwest runs lower, especially in winter.

Use the figure for the region where you camp most so the panel size matches your real conditions.

It is a planning estimate, not a quote, since real cost depends on the brands, the controller, wiring, and whether you install it yourself.

Because you set the panel and battery prices, the result reflects current numbers rather than a fixed guess.

Treat it as a starting budget, then confirm pricing with a retailer.