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 Your RV refrigeratorâs wattage will depend on its size, age, model and source of electricity or mode of supply. DIY wiring diagrams for 100W, 200W, 300W, 400W, 600W, 800W kits. Rated Watts 0 (0 kW) ... RV Air Conditioner (13,500 BTU) Outdoor Light String: Space Heater: Electric Grill: Inflator Pump: If we multiply 50 amps by 120 volts, we get a rating of 6,000 watts. Product list and cost of components. 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. So, say for example you need a AC of 7000 BTU opt for a generator that has watt rating of more than 2000. Choosing otherwise could lead to damage in your RV, appliances, and generator itself. Each unit will also require a certain number of "running watts," which will be lower (sometimes significantly) than the start-up watts needed. Appliance Wattage and Amperage Consumption (Approximate) Appliance: Watts* Amps* Air Conditioner 13,500 Btu: 1700 : 14: Air Conditioner 15,000 Btu: 1950 : 16 A Watt is power and specifically it is a Joule/sec, which is a rate, not an amount. Needless to mention, you wonât get an inverter rated the exact value you get from your calculations. 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. Clearly, just from the starting wattage requirement, a 3000-watt generator will be insufficient. Generator Wattage Calculator ... Wattage required at initial startup by tools and appliances with electric motors. Some inverters only display the VA output (since it is easier to calculate). Solar calculator for RV or camper van conversions. For this RV, youâll need an inverter with a Wattage output of 2454 Watts. 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. The Total Wattage = 2045 + 409 = 2454 Watts. Wattage Calculator . Current (A or amps) equals watts (W) divided by voltage (V), or more simply, A=W/V. The formula for determining wattage requires in a 50 amp service RV multiplying amps by volts. You may also want to consider using an inverter generator for sensitive electronic devices. You can easily calculate wattage usage yourself. To calculate wattage, you need two things: POWER which is 120 volts and AMPS. A 13,500 BTU air conditioner will need a generator having watts of more than 3000. But if you look to the DC readings from a battery monitor, you can always determine the actual wattage being pulled from your batteries. It will be either 120 V, DC battery, or propane. RV air conditioners are typically either 15,000 Btu (British thermal units) or 13,500 Btu, although other sizes exist as well. Surge Watts 0 (0 kW) The ongoing wattage required for all tools and appliances you want to run. On an average the rvâs use ACâs that have running wattage in between 400-700 watts. This is usually used if the exact wattage requirement is not listed in your manual. In such a case, you should consider getting a model rated above your Total Wattage â¦ A watt is not a unit of energy that is used over any period of time. To be able to determine the watts used by your fridge, you may use the formula, watt = amps x volts. 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. 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