RV FEATURE
On the other hand , you might look at the example above and reconsider the usage of your appliances so that you use much fewer amp hours over a 24-hour period , especially if you know the weather is going to be bad . You might be able to reduce your power usage during the 24-hour period to less than 100Ah in total .
By a long margin , a compressor fridge is the highest powerconsuming appliance in the above example . It is also surprising to see how much battery capacity a TV and recharging a few mobile phones will use .
Keep in mind , you may have a three-way fridge that can be run on gas while off-grid . That virtually halves the total amp hours consumed per day , meaning a smaller battery will suffice .
USING AN INVERTER
Appliances requiring 240V power are generally rated in watts . For example , a typical microwave fitted to most caravans will be rated at 900W . If you want to know how many amps will be drawn from your 12V battery , simply divide the watt rating by 10 . In this case , the microwave will draw around 90 amps while operating .
That sounds like a lot , and it is , but remember you only use a microwave for short periods of time . If you ran the microwave for just five minutes a day , or 1 / 12 of an hour , it would only take about 7.5Ah out of the battery in total . The same could be said about similar appliances , like coffee machines or electric kettles .
Other appliances , such as air fryers , induction cooktops or air conditioners , use more power again , and are used for longer periods of time . If you were to run one of these from an inverter , you could make a huge dent in your battery ’ s state of charge ( SOC ). For example , if you ran a 1200W air fryer for 20 minutes ( 1 / 3 of an hour ), it would take 40Ah from your battery .
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