![]() Now, if you are connected to 120-volt shore power, none of the above matters much, as your converter charger will replenish the RV batteries as loads (amps) are drawn. Water pump requirements – Photo from iRV2 ![]() 2 amps and operates 24 hours will consume 4.8 amp hours from your batteries. If the furnace runs a half-hour, it will consume 3.5 amp hours from your battery bank. The blower motor and related 12-volt components of your propane furnace draw 7 amps while running.If you burn it for 2 hours it will consume 3 amp hours of battery power, etc. If you leave the light on (burning) for one hour it will consume 1.5 amp hours of battery power. An incandescent 12-volt ceiling light bulb has a draw of 1.5 amps.Just as we added up the 120-volt shore power needs in watt-hours, we will add up the needs of 12-volt (battery-powered) appliances in amp-hours. Note that amp-hours are commonly abbreviated as “A.H.”, “Ah” or similar. This is definitely more convenient than watts as deep-cycle RV batteries (aka “House Battery”) are rated in amp-hours rather than watt-hours. Rarely are the electrical requirements of the 12-volt appliances (water pump, furnace motor, lights, etc) expressed in any form other than amps. While watts and watt-hours can also be applied to the 12-volt system in RVs, it seldom is. When they aren’t expressed as watts, we looked at how to multiply voltage times amperage to determine watts, then by including run times to determine watt-hours. In this post, we will look at how to determine the electrical demands of your 12-volt battery system by learning about amps and amp-hours.Īs we shared in the last couple of installments, the electrical needs of 120-volt appliances are typically expressed in “watts” on the back of the appliance. In our previous article, we looked at how to calculate your RV’s 120-volt shore power needs by calculating watts and watt-hours. Results will vary depending on temperature, battery condition, large loads, and loads over long periods of time. As with anything electrical, there are exceptions to every rule of thumb, but the basic information shared below is applicable in most RVing situations. Note: As in the last two installments, this information is designed to help newbie RVers better understand the electrical needs of their RV.
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