i plan to run a device consuming only 1.5ah off a inverter. if i connect this to a fully charged 50ah 12 car battery, how long would the battery last? any ideas???
2007-04-19 10:35:51 · 4 answers · asked by mrbigjag 2 in Science & Mathematics ➔ Engineering
To answer this question more information is required, as you can see you varying answers probably because they are making diff rent assumptions and they may be wrong.
what is the voltage of the device and its power consumption in watts or its current rating.
It is not clear from you question whether your device is 12v dc
or it is being driven by your inverter.
I will need to know the a.c voltage.
It would also be help full if you can supply the power consumption of your inverter.
2007-04-20 07:25:22 · answer #1 · answered by mad_jim 3 · 0⤊ 0⤋
120 Volts * 1.5 Amps = 180 Watts
180 W / 12 volt battery = 15 Amps from the battery
efficiency for small inverters: 70% estimate based on my experience)
15 Amps / 0.7 = 21.4 Amps actual current draw from the battery, which is close to 1/2 the Amp-hour rating of the battery.
You'll get a little over 2 hours (inverse of 1/2 the amp-hour rating), maybe 3 tops. The battery terminal voltage will start off higher than 12, but drop below 12 by the end of 2 hours.
.
2007-04-19 18:58:44 · answer #2 · answered by tlbs101 7 · 3⤊ 0⤋
Inverters that I have used are very inefficient. So you may get 10 to 12 hours if it is a good inverter.
2007-04-19 17:44:51 · answer #3 · answered by Ron G 5 · 0⤊ 0⤋
Well the efficiency is not vey good on the power conversion I would guess that 25% of the theoretical may be possible. Maybe 8 to 10 hours tops.
2007-04-19 17:41:21 · answer #4 · answered by Mikee 3 · 0⤊ 0⤋