Each unit will also require a certain number of "running watts," which will be lower (sometimes significantly) than the start-up watts needed. Current (A or amps) equals watts (W) divided by voltage (V), or more simply, A=W/V. Appliance Wattage and Amperage Consumption (Approximate) Appliance: Watts* Amps* Air Conditioner 13,500 Btu: 1700 : 14: Air Conditioner 15,000 Btu: 1950 : 16 To calculate wattage, you need two things: POWER which is 120 volts and AMPS. Choosing otherwise could lead to damage in your RV, appliances, and generator itself. Solar calculator for RV or camper van conversions. The formula for determining wattage requires in a 50 amp service RV multiplying amps by volts. But if you look to the DC readings from a battery monitor, you can always determine the actual wattage being pulled from your batteries. Surge Watts 0 (0 kW) The ongoing wattage required for all tools and appliances you want to run. There are different categories to consider when choosing a generator for your needs: recreation, home standby and construction. Knowing what is plugged into each circuit can help you determine why your RV breakers are tripping, The chart below is only a guideline; the exact wattage usage can vary a lot depending on the specific appliance. A 13,500 BTU air conditioner will need a generator having watts of more than 3000. Some inverters only display the VA output (since it is easier to calculate). But because a 50 amp connection has two hot wires, we can then double that wattage to achieve a maximum rating of 12,00 watts. In such a case, you should consider getting a model rated above your Total Wattage â¦ For this RV, youâll need an inverter with a Wattage output of 2454 Watts. A Watt is power and specifically it is a Joule/sec, which is a rate, not an amount. On an average the rvâs use ACâs that have running wattage in between 400-700 watts. For example if you have a coffee pot that is rated at 1500 watts, you can easily calculate the maximum amount of current that coffee pot will draw by dividing that wattage number by 110 volts, which is the voltage available on your standard AC receptacles in your RV Product list and cost of components. Clearly, just from the starting wattage requirement, a 3000-watt generator will be insufficient. It will be either 120 V, DC battery, or propane. You can easily calculate wattage usage yourself. DIY wiring diagrams for 100W, 200W, 300W, 400W, 600W, 800W kits. To be able to determine the watts used by your fridge, you may use the formula, watt = amps x volts. Wattage Calculator . Needless to mention, you wonât get an inverter rated the exact value you get from your calculations. You may also want to consider using an inverter generator for sensitive electronic devices. Rated Watts 0 (0 kW) ... RV Air Conditioner (13,500 BTU) Outdoor Light String: Space Heater: Electric Grill: Inflator Pump: So, say for example you need a AC of 7000 BTU opt for a generator that has watt rating of more than 2000. A watt is not a unit of energy that is used over any period of time. Put differently, a watt-sec is a joule and a kilowatt hour (the units of energy that you get billed for by the power company) is 1000 watt-hr, or multiply by 60sec and you have 60,000 joules. This is usually used if the exact wattage requirement is not listed in your manual. Generator Wattage Calculator ... Wattage required at initial startup by tools and appliances with electric motors. If we multiply 50 amps by 120 volts, we get a rating of 6,000 watts. For example, if your air conditioner has 15000 BTUs of power, it will likely have a 3500 wattage requirement for startup, and a 1500 running wattage. Your RV refrigeratorâs wattage will depend on its size, age, model and source of electricity or mode of supply. 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