Typical Wattages of Appliances | Solar Energy DC Inc.

• Aquarium = 50–1210 Watts
• Clock radio = 10 Watts
• Coffee maker = 900–1200 Watts
• Clothes washer = 350–500 Watts
• Clothes dryer = 1800–5000 Watts
• Dishwasher = 1200–2400 Watts(using the drying feature greatly increases energy consumption)
• Dehumidifier = 785 Watts
• Electric blanket- Single/Double = 60 / 100 Watts
• Ceiling Fans = 65–175 Watts
• Window Fans= 55–250 Watts
• Furnace Fans= 750 Watts
• Hair dryer = 1200–1875 Watts
• Heater (portable) = 750–1500 Watts
• Clothes iron = 1000–1800 Watts
• Microwave oven = 750–1100 Watts
• CPU – awake / asleep = 120 Watts / 30 Watts or less
• Monitor – awake / asleep = 150 Watts / 30 Watts or less
• Laptop = 50 Watts
• Radio (stereo) = 70–400 Watts
• Refrigerator (frost-free, 16 cubic feet) = 725 Watts
• 19″ Television = 65–110 Watts
• 27″ Television = 113 Watts
• 36″ Television = 133 Watts
• 53″-61″ Projector = 170 Watts
• Flat screen Television = 120 Watts
• Toaster = 800–1400 Watts
• Toaster oven = 1225 Watts
• VCR/DVD = 17–21 / 20–25 Watts
• Vacuum cleaner = 1000–1440 Watts
• Water heater (40 gallon) = 4500–5500 Watts
• Water pump (deep well) = 250–1100 Watts
• Water bed (with heater, no cover) = 120–380 Watts

Note: To estimate the number of hours that a refrigerator actually operates at its maximum wattage, divide the total time the refrigerator is plugged in by three. Refrigerators, although turned “on” all the time, actually cycle on and off as needed to maintain interior temperatures.

Here 

is 

the 

simple 

way 

to 

choose 

what 

kind 

of 

system 

size 

do 

you 

need 

for 

your 

RV

• First of all charge your batteries completely using generator.
• After that do your usual activities without charging batteries and see how long will your batteries last for.
• Take your battery capacity and divide it on the number of hours it lasted for. This will tell you how much electricity you use daily.
• Usually RVs use between 50 and 100 ampere hours of electric energy per day. 100 Watt rated panel produces about 80 Watts in a real world conditions. 80 Watts with 12 volts comes to about 6.5 amperes. If you take a 5 peak sun hours per day, then you can estimate that one 100 Watt rated panel will give you about 30 ampere hours of electricity, don’t forget that some power is lost in a charger and wires (they heat up).
• So if you use 50 ampere hours of energy you will need about two 100 watt panels to break even.