i am planning to buy a inverter to run a device which only consumes 1.5ah. how long would a fully charged 50ah car battery last powering the device?
2007-04-19 11:13:49 · 4 answers · asked by mrbigjag 2 in Science & Mathematics ➔ Other - Science
You haven't told us how long it takes the device to consume 1.5 ampere-hours of energy. If it takes 10 hours, the car battery could probably power it for 200 hours.
2007-04-20 17:36:37 · answer #1 · answered by Frank N 7 · 0⤊ 0⤋
The car battery has 50Ah at 12V or 600Wh
The device takes 1.5Ah but at 120V or 180W per hour
600Wh/180W/h = 3.33hours with 100% efficiency
The most you can get is about 2 to 3 hours considering efficiency, and you can't completely drain the battery and have the inverter work until the last second, most stop working when the voltage drops to ~10V.
2007-04-19 11:33:22 · answer #2 · answered by blueice 2 · 0⤊ 0⤋
Most inverter batteries are 225 amps. But with a 50 amp battery you could get about 30 hours. Remember, it is not advisable to discharge the battery more than 90% or you'll have trouble recharging fully and it will wear out you battery faster. The efficiency can range from 85-97%.
2007-04-19 11:28:58 · answer #3 · answered by misoma5 7 · 0⤊ 0⤋
An average invertor will be 80% efficient. A really good modern one, as much as 95%. So at worst (50/1.5)*.0.8hrs
2007-04-19 11:19:57 · answer #4 · answered by Del Piero 10 7 · 0⤊ 0⤋