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Multiply this number by two to find your battery's true AH rating. For example, if your battery's current was 12 amps and the voltage reached 12 volts after 10 hours exactly, then the battery capacity is 12 x 10 x 2 = or a rating of 240 AH in total.
How Many Amps Are In A 12 Volt Battery? A standard 12-volt vehicle battery really has a 48 AH capacity. With a full charge, the battery can deliver around one amp for two days. Alternatively, it may provide approximately 2 amps for a full day. The same is true for similar ratios. AH stands for amp hour in this context. This is battery energy capacity.
Since watts = amps * volts divide the watt hours by the voltage of the battery to get amp-hours of battery storage. Amp-hours (at 12 volts) = watt-hours / 12 volts = 1470 / 12 = 122.5 amp-hours. If you are using a different voltage battery the amp-hours will change by dividing it by the battery voltage you are using.
There is a significant loss of power when energy going into the lamp is actually being used to run it. Therefore, each lamp will pull ~4.1 amps each per hour. For 9 lamps and 8 hours, that‘s a total of 295.2 amps pulled from a 12 volt battery source. My recommendation: 12 volts with at least 600 available Amp Hours.
An amp-hour -- properly "ampere-hour" -- is a unit of measure describing electrical charge capacity. If a battery is said to have "20 amp-hours of capacity," it means that it can hypothetically discharge one amp of current for 20 hours, 20 amps for one hour, or any combination of amps and hours that equal 20 amp-hours.
An incandescent 12-volt ceiling light bulb has a draw of 1.5 amps. If you leave the light on (burning) for one hour it will consume 1.5 amp hours of battery power. If you burn it for 2 hours it will consume 3 amp hours of battery power, etc. The blower motor and related 12-volt components of your propane furnace draw 7 amps while running. If the furnace runs a half …
How many Amps to Charge a Car Battery. If your car battery is 12-volts, it will begin the charging process at 13.8 volts which is the pressure behind the amps. The amount of amps used is up to the owner but common amp chargers are 1.5 or 2 to top off or maintain, or 4-6 amps to charge a battery from dead overnight.
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