How To Tell How Many Amp Hours A Battery Has. Meanwhile the same battery may safely provide 36 amp hours for a period of 100 hours. We decided that our fridge uses 2 amps per hour for 12 hours per day 2amps x 12 hours 24Ah.
To know how many ampere in a 12-volt car battery the battery may have to be charged to full capacity. For instance if your battery features 1 amp hour then it means that it is capable of discharging 1 ampere of current within one hour. You cant tell anything for sure about a battery until its charged.
Amp hours are calculated by multiplying the amp output of a battery by an amount of time.
For example 24 kWh 500 amp hours at 48 volts 500 Ah x 48V 24 kWh. Meanwhile the same battery may safely provide 36 amp hours for a period of 100 hours. For large batteries the rating is abbreviated as Ah. For example if you have something that draws 20 amps and you use it for 20 minutes then the amp-hours used would be 20 amps x 333 hours or 667 AH.
