How long would a cars battery last with a cell phone and charger connected to a 12V constant? - car battery amp hour rating
Well, I know it is something like a vague question, and depends on many factors (size of the battery charger specifications, ie, type of car, age of batteries, etc.), but I 'm just looking for an idea or an average . I watched the answers to the question via the Internet, up from 24 Clock 3 weeks and you just want to see if we can do the calculation, and lead a reasonable answer once and for all.
Background:
I Connecting a mobile phone Motorola I415 (5V 550mA) 12V at a constant connection to my Mazda 6 2008 (4 cyl) for GPS tracking purposes. However the car for the day without fear and can use the battery beyond the point of the reduction may be able to sit to start the car. For this problem, we assume that the battery operates in a good order, so that the battery status is not a variable.
The mathematics, as I see it: correct (please me if I'm wrong) lie, provided the battery 75Ah (not sure) of the figure is the battery at 590 amps cold start (735 amp rated start)
The charger is rated at 5.0V and 550mA
= 550mA55 A (ampere chargers use while charging)
5V * 55 A = 2.7 W (with the charger used for charging)
75Ah * 12V = 900 W (power from the battery is * *)
900W / 2,7 W = 333 hours or 13.8 days of use before the battery died.
Assuming the above correct what would be the best estimate of how long remain to be charged and the charger plugged before the point of no return is reached (ie, the car would not start).
Another aspect is the charger performance may vary. From what I understand, if the battery is charging adapter 12V rear cargo to avoid excessive charging of the battery. This factor can only increase, how much time will it take the car, but guess every other aspect of the crowd.
Friday, January 8, 2010
Car Battery Amp Hour Rating How Long Would A Cars Battery Last With A Cell Phone And Charger Connected To A 12V Constant?
2 comments:
They go wrong at this point:
75Ah * 12V = 900 W (power from the battery is * *)
900W / 2,7 W = 333 hours or 13.8 days of use before the battery died.
Shall
75Ah * 12V = 900 watt-hours
900 watt-hours / 2.7 Watt = 330 hours. You need to be corrected.
always look at the units to give the answer units are combined.
But the car's 12 volt battery and charger 5 volts. You need to convert the others. In an ideal world you could use a DC-DC converters, and even with only 2.7 watts (about 3 at a loss), but a single regulatory authority is the same current to 12 V or 12 V x 0.55 amps = 7 Watts using
900 watt-hours / 7 watts = 128 hours or 5 days
However, two other factors:
1. I do not think that using the battery charger 550 mA continuous, only a cell phone, an almost empty battery is charged. The constant application would be much less, I think. I think an average of 100 mA. You can verify this with an ammeter.
2. You can not with 75 hours on the amplifier battery, except's brand new.
.
My phone has not consume approximately 550 mA. Maybe you have the charger or can offer this product.
How long would the battery last?
It is very difficult to answer. The draw of the phone is probably at or below the rate of self-battery.
The battery capacity is required completely different from one car to another.
Personally, I do not think the phone is charged, the car electrics. However, it is advisable to leave your cell phone or other consumer electronics in a hot car.
I hope that answers your question.
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