Solar vs. Generator for RV Boondocking: An Honest Comparison

The honest answer up front

For most RVers who boondock more than a few weekends per year, the answer is both, in different proportions depending on your usage. Solar handles the steady daytime base load (fridge, lights, charging) silently and free. A generator handles the occasional heavy lift (running the AC, charging a depleted bank quickly, cloudy stretches).

If you absolutely must choose one, here's the rough rule:

• Solar wins if you boondock often, prefer quiet, and don't need to run AC.
• Generator wins if you boondock rarely, want AC away from hookups, or your typical site is heavily shaded.

The rest of this guide explains why — and helps you size whichever direction you go.

What solar is good at

• Silent. Zero noise. Critical at quiet campgrounds and friendly to neighbors.
• Zero ongoing fuel cost. After install, the daily energy is free.
• Zero maintenance. No oil changes, no spark plugs, no carburetors. Wipe panels twice a year. That's it.
• Available everywhere there's daylight. Even cloudy days produce 20-40% of full output.
• Allowed in noise-restricted zones. Many BLM areas, National Forests, and HOA-style boondocking sites prohibit generators after 8pm or 10pm. Solar runs anytime.

What solar is bad at

• Doesn't work at night. Obvious but worth stating — if you need power after dark, you're drawing from batteries that solar charged earlier.
• Variable output. A four-day stretch of overcast can drop production to 25% of normal. Without enough battery to ride that out, you're stuck.
• Roof real estate is finite. A travel trailer roof typically fits 600-1000W of panels max. Above that, you need ground-deploy panels (a hassle to set up and theft-prone).
• Won't run a residential AC unit alone. AC requires 1500-2000+ continuous watts. Even 1500W of solar paired with a big lithium bank gives you maybe 4-6 hours of AC on a sunny day — enough for a hot afternoon, not enough for a hot week.
• Big upfront cost. 800W of solar + MPPT controller + 400Ah of lithium runs $3,500-6,000 installed. Pays for itself but takes years.

What generators are good at

• Power on demand. Push a button, get 3,000+ watts immediately. No waiting for sunrise.
• Will run AC. A 3,000W or 3,500W inverter generator handles a 13,500 BTU AC indefinitely.
• Cheap upfront. A high-quality 3,000W inverter generator runs $700-2,500. A budget unit: $400-700.
• Works in any weather. Cloudy week? Snow on the panels? Doesn't matter.
• Compact. 30-90 lbs, fits in any cargo bay.

What generators are bad at

• Noise. Even modern inverter generators run 50-60 dB at 25 feet — quieter than a normal conversation but still audible. Older or larger generators are 70-85 dB.
• Fuel cost. A 3,000W generator burns about 0.4 gal/hour at half load. Running it 6 hours/day is 2.4 gallons. At $4/gal, that's $10/day, or $300/month if you live in your RV.
• Fuel logistics. You're carrying gas cans (a fire risk), or piping in propane. Refills are part of every supply run.
• Maintenance. Oil changes every 50-100 hours. Carburetor problems if stored wet. Spark plug wear. Air filter cleaning.
• Restricted hours. Most campgrounds and many boondocking sites prohibit generator use 10pm-6am or 8pm-8am.
• Theft target. Portable generators are easy targets. Cable locks help; built-in onboard generators don't have this issue.

The math of running both

The most resilient setups use solar as the daily workhorse and a generator as backup. Here's why this combination is so much better than either alone:

• On sunny days, solar covers 80-100% of needs. Generator stays in the bay, fuel unburned.
• On cloudy stretches, generator runs 1-2 hours/day to bring batteries back up. Far less fuel than running it for hours.
• For AC use, generator runs only when AC is on. Solar handles the rest.
• Generator runtime over a year drops from 200+ hours (generator-only setups) to maybe 20-40 hours.

For a typical solar+generator hybrid, the numbers usually look like this for a couple boondocking 4-6 weeks/year:

The hybrid generally wins on five-year cost and daily quality of life. The all-solar setup wins on quiet operation. The generator-only setup is cheapest if you boondock rarely.

How to decide for your situation

A few simple questions usually settle it:

1. Do you need to run your AC off-grid? Yes ⇒ you need a generator (or a very large solar+lithium setup > $8K).
2. How often do you boondock? Less than 5 nights/year ⇒ small generator, no solar needed. 5-30 nights/year ⇒ consider a small solar starter kit + generator backup. 30+ nights/year ⇒ invest in real solar; add generator only if you need AC or live in cloudy regions.
3. What climate? Sunny southwest ⇒ solar pays off fast. Pacific Northwest, New England in winter ⇒ generator is more reliable.
4. How important is silence to you? If quiet camping is the whole point, push the budget toward solar.

The good news: the question isn't permanent. Many RVers start with a generator, add a 200W solar starter kit when they realize they're boondocking more often, then upgrade to a serious solar+lithium system once they're full-timing. Each step adds capability without making the previous step obsolete.

Frequently Asked Questions