RV solar is either the best upgrade you'll ever make or an expensive collection of roof hardware that doesn't do what you thought. The difference is understanding what solar can and cannot do before you spend a dollar.
RV solar is either the best upgrade you'll ever make or an expensive collection of roof hardware that doesn't do what you thought it would. The difference is entirely about understanding what solar can and cannot do before you spend a dollar. We see both versions — the setups that genuinely changed how people camp, and the $3,000 installs that can't run the AC and leave owners confused about why.
Here's the straight version: what solar does, what it takes to do it right, and whether it makes sense for your situation.
What Solar Actually Does (And Doesn't)
Solar panels convert sunlight into electricity that charges your batteries. That's the whole job. What solar does NOT do:
- Run your appliances directly — solar charges batteries, and batteries (via an inverter) run your 120V appliances. The panels are the input, the batteries are the storage, and the inverter is what makes it usable.
- Run your rooftop air conditioner on a standard setup — a 15,000 BTU RV AC pulls 1,200–1,500 watts running. You need a serious battery bank and a large inverter to run it off solar, and you still need enough sun to keep up with the draw. It's doable but expensive to do right.
- Produce full output in anything less than direct sun — a 400W panel in partial shade might produce 80W. Overcast days in NorCal can drop output by 60–80%. Factor this into how much capacity you actually need.
The Four Components Every System Needs
Solar panels
Monocrystalline panels are the current standard — more efficient per square foot than polycrystalline, better in low-light conditions. For most boondocking setups, 400–800 watts covers basic needs (lighting, fans, phone charging, laptop, 12V devices). Running an AC on solar starts at around 2,000W of panels minimum, paired with a large battery bank.
Charge controller
The device between your panels and batteries that regulates charging voltage and prevents overcharging. MPPT (Maximum Power Point Tracking) controllers extract 20–30% more power from your panels than PWM controllers and are worth the extra cost on any serious system. Don't let anyone talk you into a PWM controller on a system over 200W.
Battery bank
The most important — and most expensive — part of the system. Your batteries determine how much power you can actually store and use. 100Ah of lithium at 100% usable capacity does the work of 200Ah of AGM at 50% usable. Undersized batteries mean your panels are doing their job but you run out of power by 10pm.
Inverter
Converts 12V DC battery power to 120V AC for running standard appliances. Size it to your biggest single load, not your average load. If you want to run a microwave (1,000–1,500W surge), get a 2,000W inverter minimum. Pure sine wave inverters are required for sensitive electronics — modified sine wave can damage some devices.
Size for what you actually use, not what you might use
The most common solar mistake is building for a dream scenario instead of actual usage. Track your real power consumption for a few days: check what your battery monitor shows at night vs. morning. That delta — what you used overnight — is the minimum storage you need. Your daily solar input needs to replace that by mid-afternoon to keep up. Build from real numbers, not guesses.
What Kills Solar Systems
- Undersized wire — solar systems carry significant current. Undersized wire causes voltage drop (you lose power before it reaches the batteries) and heat (a fire risk). This is where DIY installs most often go wrong.
- Panels wired incorrectly — series vs. parallel wiring affects voltage and amperage. Running panels in a configuration your charge controller can't handle wastes capacity or damages the controller.
- Shading — even partial shading of one panel in a series string can kill output for the entire string. Panel placement matters. A single tree branch hitting one panel can drop your whole array.
- Cheap charge controllers — a bad controller overcharges batteries (killing them early) or undercharges (meaning you never get full capacity). The controller is not the place to save money.
Is It Worth It for Your Setup?
Solar makes the most sense if you regularly camp without hookups for multiple nights. The break-even math on a $2,000–3,000 installed system vs. campground hookup fees varies, but if you dry camp 20+ nights per year, the numbers work in your favor within a few years — plus you get to camp places that have no hookups at all.
It makes less sense if you primarily stay at full-hookup parks. In that case, a good battery bank and a quality converter/charger does most of what you need for a fraction of the cost.
Common Question
How many solar panels do I need?
A simple rule of thumb: figure out your daily amp-hour usage (most battery monitors will show you this), then size your panels to replace that in 4–5 hours of good sun. If you use 100Ah per day, you need roughly 400–500W of panels in good conditions — more if you camp in partial shade or overcast climates. For running an AC with solar, budget at least 2,000W of panels and 200–400Ah of lithium storage, and even then you'll be running the generator on cloudy days.
A well-designed solar system is genuinely transformative — we've installed setups that let people camp for weeks without hookups in complete comfort. A poorly designed one is an expensive lesson. If you're planning a solar install, get the design right before you buy parts. We do on-site consultations and installs throughout Northern California — it's a lot easier to do it right the first time than to redo a bad install.
BossBros RV Team
Redding, CA