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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 …
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.
The C rating tells you how many amp hours the battery can provide for a very specific period of time. For instance, at C/5 a battery might safely provide 26.8 amp hours. This means that is supplies 26.8 amps in the duration of 5 hours without dropping off. Meanwhile, the same battery may safely provide 36 amp hours for a period of 100 hours.
Divide the battery's 100-amp-hour capacity by 83.3, and you get 1.2 hours, or about 1 hour and 12 minutes of tunes before the battery dies. Caveat Manufacturers test and rate batteries according to a certain discharge time -- in the automotive industry, usually 20 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 …
Input these numbers into their respective fields of the battery amp hour calculator. It uses the formula mentioned above: E = V * Q. Q = E / V = 26.4 / 12 = 2.2 Ah. The battery capacity is equal to 2.2 Ah.
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