![]() There is another reason to use a high capacity battery. Motors, power tools and air compressors also have high surge watts. Not all appliances have starting watt requirements, but large ones like refrigerators and air conditioners do. Will it completely drain your system? Unlikely, but we strongly suggest to have a high capacity battery just in case. ![]() But it is better to have more battery power in case of a power surge.Įven if the starting watts lasts for only a second, the battery must be able to supply the power. A 700 watt microwave for instance, may only require 1000 starting watts or so. However this probably will not be an issue if you only use the device for a few a minutes a day.ĭo all microwaves have high starting wattage? Most regular models do, but portable units may not. Keep that in mind especially if you have a deep cycle battery that requires a 50% depth discharge. The starting watts is only for a second or less, but it could pull a lot of power from the battery. But it is better to overestimate the battery requirements, so assume that a 1500 watt microwave needs 3000 watts to start or 125 amps. You should always check the specs to be certain. A 1200 watt microwave might need 2000 to 2400 watts to start before running at 1200 watts, for example. Just like a refrigerator, the starting watts required by microwaves are sometimes twice its running watts. Running Watts and Starting Watts Explained Batteries also lose charge faster when more amps are pulled, so reserve power is recommended. If a microwave uses only 35 amps an hour, why should you get a 250ah battery? That is because microwaves use a lot of power to start up. An 800 watt 12V microwave running at full heat for 15 minutes will draw 25-35 amps. This is enough to run the microwave and does not need as much maintenance as other batreies.īut most of us use it for just a few minutes to heat food, so wattage will be lower. Run a 1500 watt microwave for an hour and that is what it consumes, 1500 watts or 125 to 150 amps, depending on the inverter efficiency rating.Ī good choice would be he Mighty Max 250ah 12V SLA battery. The watts used by a microwave also depends on the settings and how long it runs. When it comes to batteries and solar power in general, you can never have too much power. That is 125 amps, but because inverters are not fully efficient, a 200ah or 250ah battery is more appropriate. If you have a 1500 microwave for example: Regular sized models require 1000 to 1500 watts to run, while compact models run on 700-800 watts.īattery capacity is measured in amps, so the first thing you have to do is convert watts to amps as described above. Microwaves come in all shapes and sizes, but they generally fall into two types, regular and compact microwaves. You should get a 250ah deep cycle battery to run a microwave. But if you factor in inverter inefficiency, which can be up to 15%, you are looking at a 150 amp draw. But it does use a lot of power, so how many batteries will you need? That is what this guide is for, to give you an in-depth guide on how many batteries are needed to run a microwave.Ī regular microwave uses 800 to 1500 watts or up to 130 amps. Having a microwave just makes food preparation so much easier, so no wonder it is a fixture in homes and RVs. As an Amazon Associate, this site earns commissions from qualifying purchases.
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