A small RV generator usually costs anywhere from about $500 to $3,000, depending on what size you need, how quiet it is, and whether it’s a portable or built-in model. If you’re only looking for a basic portable generator to run a few essentials, like lights, a fan, a TV, or to keep batteries charged, you can often find decent options in the $500 to $1,200 range. Once you get into inverter generators, which are usually quieter and better for electronics, the price often moves into the $900 to $2,000 range pretty quickly.
If you want a built-in RV generator, the cost is usually higher. Smaller built-in units can start around $1,500, but many end up costing $2,000 to $4,000 or more once you factor in brand, wattage, and installation. Installation matters a lot here. A generator itself may look affordable, but mounting it, wiring it, adding fuel lines, and setting up controls can add several hundred dollars or more. People often forget that part when budgeting.
The cheapest option is not always the best deal. A low-priced generator might be loud, use more fuel, or struggle when you try to run an air conditioner. That said, if you only camp occasionally and don’t need to power much, there’s no reason to overbuy. For a small trailer or a compact motorhome, a 2,000-watt to 3,500-watt inverter generator is often enough for lighter use, while air conditioning usually pushes you toward something stronger.
Fuel type also affects the cost. Gasoline models are often the least expensive up front. Propane or dual-fuel models can cost a bit more, but some RV owners like the flexibility. Diesel units tend to be more expensive, especially for built-in systems, but they may fit certain rigs better.
If you’re shopping, compare more than just the sticker price. Look at noise rating, runtime at half load, fuel consumption, weight, and warranty. A unit that costs $200 more but runs quieter and lasts longer can be the better buy in the long run. If you’re buying used, check service hours, maintenance history, and whether replacement parts are easy to find.
For most RV owners, a realistic budget for a small generator is around $700 to $1,500 for a portable unit, or $2,000 and up for a built-in setup with installation. The right choice really depends on how much power you need and how often you plan to use it.
