Rear defross amp draw
Rear defross amp draw
Not sure if this has been posted already? anybody have any problems when turning on rear defrost, that the current voltage on the battery drops extremely low? i live in a cold climate area, but even after drving the car for 10 to 15 minutes, i notice my voltage drops from 14.4v to like 12.7v. I have had the battery checked the voltage is good on it 14.4. I do understand by using the blower for heat and other accessories light headlights or fogs will cause more of a draw on battery. But let me know if anyone has come across this problem?
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If you look on the corner of the rear glass in orange print, it reads 270W.
I assume this is for the power that the rear defroster uses. If that is the case, then 270W/14.4V = 18.75 amps. But since the voltage dips to 12.7 V, then it's pulling right around 21 amps. A lot, isn't it?
I assume this is for the power that the rear defroster uses. If that is the case, then 270W/14.4V = 18.75 amps. But since the voltage dips to 12.7 V, then it's pulling right around 21 amps. A lot, isn't it?
yea thanks for the imput, i thought so but just wanted another opinion,and yea!!! that is a large amperage pull for the rear defrost damn!!!! 
Guess i dont need to have to many accessories running while the rear defrost is on uh!!??? 
Guess i dont need to have to many accessories running while the rear defrost is on uh!!???
it's a large draw because of how a defroster works.
each one of those lines on the window is a wire that heats up (think what happens when you touch a postive and negative wire to each other)
that's a large amount of energy used which gives off heat
each one of those lines on the window is a wire that heats up (think what happens when you touch a postive and negative wire to each other)
that's a large amount of energy used which gives off heat
Originally Posted by internetautomar
it's a large draw because of how a defroster works.
each one of those lines on the window is a wire that heats up (think what happens when you touch a postive and negative wire to each other)
that's a large amount of energy used which gives off heat
each one of those lines on the window is a wire that heats up (think what happens when you touch a postive and negative wire to each other)
that's a large amount of energy used which gives off heat
i understand though just figure that a little less draw could be used to cause a heating action
Originally Posted by jkmay01
oh dont get me wrong i understand the concepts of electrical current and how the increased flow restriction of current causes the by product of heat. like a iron does, but ya lights in ya house dont drop like that!! lol i understand though just figure that a little less draw could be used to cause a heating action
i understand though just figure that a little less draw could be used to cause a heating actionand some houses do have their lights dim when the heat/A/C first kicks in.
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