RV Microwave Guide: Choosing the Right Size and Powering It On and Off Shore Power
Your RV microwave can stop working at the worst time, whether you're parked at a campground or heating dinner miles from the nearest hookup. Replacing it takes more than finding one that fits the cabinet. You also need to check how it mounts, how much power it draws, and whether your RV's electrical system can handle it. Many RV microwaves advertise cooking watts, which are lower than the power they pull from an outlet. This guide covers the main microwave types, the numbers to check before buying, and how to plan short reheating sessions when shore power isn't available.
Types of RV Microwaves and How to Pick the Right Fit
Start with the available space and mounting requirements. An RV microwave has to stay secure through road vibration, and its ventilation needs must match the installation. Built-in and over-the-range models attach to the RV's cabinetry, while countertop units need a safe place to sit and secure storage for travel.
Type | Maker example and spec | Best for | Check before buying |
Built-in with trim kit | Greystone 0.9 cu ft built-in: 19" W × 12" H × 14" D (23-1/2" × 15-1/8" × 14" with trim) | Replacing a factory microwave in a cabinet opening | Cut-out size, trim kit, ventilation gaps the maker requires |
Over-the-range (OTR) convection | Furrion FMCM15AA-BS: 1.5 cu ft, microwave plus convection, 300 CFM exhaust fan | Larger rigs that want baking as well as reheating | Mounting kit and template, vent route, input watts per mode |
Countertop (small) | Any 0.6 to 0.9 cu ft home model whose maker allows it | Campers and vans without a built-in space | Secure storage while driving; outlet and plug type |
Before choosing a model, make sure you understand how an RV electrical system works, including the outlets and circuits your microwave will use.
Built-in microwaves
A built-in unit can be a straightforward replacement when the new model matches the existing opening. The Greystone 0.9 cu. ft. built-in microwave measures 19 inches wide, 12 inches high, and 14 inches deep without its trim kit. With the trim, the listed dimensions are 23½ inches wide, 15⅛ inches high, and 14 inches deep. Measure the opening, not just the old microwave. Check the new unit's required clearance and trim kit before ordering. Even a small difference can mean extra cabinet work.
Over-the-range convection microwaves
An over-the-range (OTR) convection microwave combines microwave cooking with a convection mode. The Furrion FMCM15AA-BS has a 1.5 cu. ft. capacity and a 300 CFM exhaust fan. It's a larger option for an RV with enough space and the right mounting setup. Check the installation template, mounting hardware, and venting instructions. You'll also need to check the electrical input for the cooking mode you plan to use. Microwave, convection, and other modes may draw different amounts of power.
Countertop microwaves for campers
A small countertop microwave can work in a camper or van if there's enough room and the manufacturer permits that use. It may be easier to replace than a built-in model, but you'll need a secure place to store it while driving. Don't assume a household microwave is suitable for an RV just because it fits on the counter. Before choosing any type, check the mounting instructions, ventilation requirements, plug, and electrical rating. Once you've settled on a model that fits, the next step is to find out how much power it needs.
Microwave Input Watts vs. Cooking Watts in an RV
The wattage on the front of a microwave usually describes its cooking output. The electrical input is higher, and that's the figure you need when checking your RV's circuit, generator, or battery power station. Here are the input figures listed for two example models.
Model (maker's page) | Cooking output | Input from the outlet | Amps at 120V (input ÷ 120V) |
Greystone 0.9 cu ft built-in | 900W | 1,350W | About 11.3A |
Furrion FMCM15AA-BS OTR convection | 900W (microwave mode) | 1,500W | 12.5A |
The current estimates use this formula: Amps = input watts ÷ volts. For the Greystone, 1,350W ÷ 120V equals 11.25A, or about 11.3A. The Furrion's 1,500W input works out to 12.5A at 120V. These figures show why cooking output alone can be misleading. A microwave advertised as 900W may draw more than 1,300W from the outlet. For a closer look at the difference, read our guide to microwave wattage. Use the input rating on the data plate or in the manual when sizing your power source.
Do the amp check on shore power
A 30-amp, 120V RV hookup provides up to 3,600W of nominal power for the entire rig. A 1,350W-input microwave uses about 11.3A, leaving less capacity for other appliances while it runs. Add up what you'll use at the same time. A microwave, coffee maker, and air conditioner can push a 30A service beyond its limit and trip the main breaker. If your microwave has convection, grill, or air-fry modes, check the input requirements for each mode instead of assuming they all use the same amount of power. Don't change breakers or RV wiring to accommodate a larger microwave. Have a qualified RV electrician assess any electrical changes.
Running an RV Microwave Without Shore Power
At a dry campsite, you can power a microwave with a properly sized generator, an RV inverter and house battery, or a portable power station. A microwave draws a lot of power while heating, so battery power is best suited to short sessions rather than extended cooking. Start by checking the microwave's input watts, the power source's rated output, the outlet rating, and the other loads running at the same time. A power station also needs enough capacity to supply the energy used during each session.
Estimated energy for short heating sessions
The table below uses a 1,350 W input microwave and assumes the microwave is the only load. A five-minute heating session uses about 112.5Wh before conversion losses.
Setup | Calculation | Estimate |
Energy for one 5-minute heating session | 1,350W × 5 ÷ 60 | About 113Wh |
EcoFlow DELTA 3 Max (2048Wh): number of 5-minute sessions | 2,048Wh × 0.85 ÷ 112.5Wh | About 15 sessions |
EcoFlow DELTA 3 Ultra Plus (3072Wh): number of 5-minute sessions | 3,072Wh × 0.85 ÷ 112.5Wh | About 23 sessions |
EcoFlow DELTA 3 Max: continuous running | 2,048Wh × 0.85 ÷ 1,350W | About 1.3 hours |
These are estimates, not guaranteed results. The calculations assume 85% of the battery's rated capacity is available after conversion losses, and they don't account for other appliances or changes in power draw. The continuous-running figure is a mathematical comparison, not a recommendation to run a microwave for 1.3 hours straight.
Choose a power station for your cooking needs
Two EcoFlow DELTA 3 models offer different levels of output and stored energy. The EcoFlow DELTA 3 Max may suit short reheating sessions with a compatible microwave. The EcoFlow DELTA 3 Ultra Plus offers more output and capacity for trips when other appliances need power, too.
If the EcoFlow DELTA 3 Max doesn't provide enough capacity for your microwave and other appliances, the EcoFlow DELTA 3 Ultra Plus offers higher output, expandable battery capacity, and more energy for additional heating sessions between recharges.
The EcoFlow DELTA 3 Max can power a compatible 120V microwave for short reheating sessions, provided its input and plug stay within the unit's 2,400W output and 20A-per-outlet limits. For a microwave plus a fridge, or more heating sessions between charges, the EcoFlow DELTA 3 Ultra Plus offers 3,600W output and a 30A TT-30R outlet. Check the fridge's running watts and startup surge before combining loads. For help estimating your needs, see our guide to microwave backup power. Neither power station replaces an RV inverter, so follow your RV's manual and never connect a power station in a way that feeds power back into campground shore power.
Installing and Using a Small RV Microwave Safely
RV kitchens have tight cabinets, shared circuits, and road vibration to contend with. Follow the microwave manufacturer's installation instructions and secure the appliance for travel.
Use the right mounting kit. Install built-in and over-the-range units with the specified hardware and template.
Keep ventilation clear. Leave the required gaps and don't block the microwave's vents.
Secure countertop models. Store the microwave so it can't slide or fall when the RV is moving.
Check the outlet. Make sure the outlet and circuit can handle the microwave's input load. Follow the manufacturer's instructions for extension cords.
Avoid stacking large loads. On 30A service, don't run the microwave alongside other high-draw appliances if the combined load exceeds the circuit limit.
Check each cooking mode. Convection and other modes may draw more power than microwave-only heating.
If you're new to campground hookups, review the basics of RV shore power before connecting appliances. Always follow the microwave and RV manuals, especially when modifying a cabinet or electrical connection.
Conclusion
Choose an RV microwave that fits the available space and mounting setup, then check its input watts rather than relying on the cooking rating. On shore power, account for the other appliances sharing the circuit. Off-grid, plan for short heating sessions and leave enough battery capacity for the rest of your needs. The EcoFlow DELTA 3 Max may suit a small microwave used on its own. If you need to run a fridge at the same time or want more energy between recharges, consider the EcoFlow DELTA 3 Ultra Plus. Check the microwave's input rating, outlet compatibility, and total load before choosing either model.
FAQs
How many watts does an RV microwave use?
RV microwave power needs vary by model. For example, the Greystone 0.9 cu. ft. built-in microwave delivers 900W of cooking power but draws 1,350W from the outlet, using about 11.3A on a 120V circuit. Check the input wattage on the appliance's data plate or in its manual when choosing a power source.
Can I use a regular microwave in my RV?
Yes, some countertop microwaves can work in an RV if they fit the available space, have a compatible outlet, and can be secured safely while traveling. Check the manufacturer's instructions, confirm that the RV circuit can handle the microwave's input wattage, and allow adequate ventilation.
Can I run a microwave on 30-amp service?
Yes, provided the combined electrical load stays within the service limit. A microwave drawing 1,350W at 120V uses about 11.3A of a 30A supply. Remember to account for other appliances, such as an air conditioner or coffee maker, running at the same time, as their combined demand can trip the breaker.
Can a portable power station run an RV microwave?
Yes, if its rated output, outlet, and capacity meet the microwave's requirements. Under the estimates in this guide, a 2,048Wh EcoFlow DELTA 3 Max could provide about 15 five-minute sessions with a 1,350W-input microwave, assuming 85% usable capacity and no other loads.
Do convection microwaves use more power?
They can, depending on the model and cooking mode. Convection, grill, and air-fry functions may draw different amounts of power than standard microwave heating. Check the appliance's data plate or manual for the input requirements of the mode you plan to use, and make sure your RV circuit or power station can support that load.
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