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Engineering/Technical Ask technical questions about cars. Do you know how a car engine works? |
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11-03-2006, 12:04 AM | #31 | ||
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Re: Charging the car battery? help
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Because one can spike at over 240volts, and the other can't?
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11-03-2006, 12:05 AM | #32 | |
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Re: Charging the car battery? help
ah. And what do 200 amp capable car alternators peak at in AC voltage?
it really doesn't matter. They prefer to avoid damage to the system(s). So we are left with considering the likelyhood of it. I don't think it's likely with a remotely modern charger or alternator. They design fail-safes into them even if they fail. They don't like being sued.
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11-03-2006, 12:10 AM | #33 | ||
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Re: Charging the car battery? help
Did you have a worse Friday than I did?
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In the states or UK that might be an issue, in the rest of the world its pretty mute. I would have hard time suing my chargers manufacturer, not only do my own country's laws make it difficult, the charger was made in China, and their laws are totally different again.
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11-03-2006, 06:54 AM | #34 | ||
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Re: Charging the car battery? help
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11-03-2006, 07:09 AM | #35 | |
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Re: Charging the car battery? help
you are correct.....
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11-03-2006, 03:45 PM | #36 | |
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Re: Charging the car battery? help
let rephrase it then.
I've been a full time mechanic for 12 years. I've never worked at a shop that worried about disconnecting the battery first. I've never seen any failure that wasn't improper use of the equipment. Some days I'll personally charge 3 or 4 batteries. Thats a lot of batteries I've charged on a very wide variety of chargers. Never had a single issue.
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11-06-2006, 02:38 PM | #37 | ||||
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Re: Charging the car battery? help
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Jim EE/ME |
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11-06-2006, 03:14 PM | #38 | ||
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Re: Charging the car battery? help
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I was trying to cut through the mystical beliefs and get someone to actually say what can cause dangerous currents to the computer. Which is simple: too much voltage. In otherwords, improper voltage regulation. Either due to a faulty charger, or due to operator error. The latter being far more likely IMO.
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11-08-2006, 01:49 AM | #39 | |
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Re: Charging the car battery? help
There are some very bizarre concepts being pushed around this thread.
So I'll throw in some of my own. Chargers provide voltage, the current through the battery is the result of this (not the cause). Chargers and alternators all push a similar voltage to charge the battery, 14.2-14.7v is the range for all the vehicles I've tested. Car electronics are safe to beyond this level and will not be damaged by a healthy charger. Of course a dodgy charger could kill anything (including you)! The only times I've bothered to disconnect a battery for charging were: 1. When the power cord wouldn't reach the car. 2. When I have had electrical leakage (the cause of the flat battery). You can even jump modern cars without problems, my jumper leads have a capacitor between the wires, damps out voltage spikes. |
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11-08-2006, 10:17 AM | #40 | |||
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Re: Charging the car battery? help
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To the contrary, some use a pulsed DC to supposedly break up sulfation. However the battery is, for all practical purposes, a capacitor and it tends to filter spikes. Try running your car radio off the charger alone without the battery. On most chargers all you will get is a loud hum... That's because it is a 1/2 wave 120cycle pulsed voltage. (No filtering caps.) You will often see this same effect when the car has a totally bad (open) battery. The main point to this thread though... If you are real anal, pull the battery to charge it. If you are pretty normal, charge it while connected. Jim |
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11-08-2006, 11:12 PM | #41 | ||
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Re: Charging the car battery? help
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I have used my charger to run a car radio before. I pulled the radio to sell it and realised there was still a CD in there. Connecting up the charger was enough to wake it up and eject the CD. Big relief. |
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11-08-2006, 11:36 PM | #42 | ||
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Re: Charging the car battery? help
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Most real chargers put out either a pulsed DC or a ripple DC. They charge better in theory at least. BTW, pulsed DC or ripple DC would still eject your CD. However if you tried to play the audio it would probably be just a hum... |
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09-29-2008, 12:14 AM | #43 | |
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Re: Charging the car battery? help
i learned my lesson. i put my charger on boost to charge my battery not taking cables off. went to start my car and had a puff of smoke come out of air vent. car started but i toasted by radio. had to buy another radio for my car. if your driving a newer car take charger off after battery is charged when cranking car .
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