Posted by John T on December 17, 2010 at 07:41:37 from (66.244.97.31):
In Reply to: Re: CAUTION CAUTION posted by mkirsch on December 17, 2010 at 05:16:24:
FUN Discussion, thanks, hope I can help..
On this one youre "close but no cigar" Your voltage argument is on track butttttttt youre not recognizing or understanding why or how the source voltage drops versus the current it can supply for x time AND THE BATTERY CAN SUPPLY MUCH MUCH MORE CURRENT THEN THE CHARGER in the short run before its voltage drops too low to continue current flow to the load, AND IN THAT TIME THE 6 VOLT BATTERY CAN BLOW UP !!!!!!!!!
The capacity DOES MAKE A DIFFERENCE YOU HAVE TO CONSIDER STORED AND AVAILABLE ENERGY AND VOLTAGE DROP..........A battery can supply many more amps (even if for only a short time) then a battery charger before its voltage drops so low it no longer can do so AND THATS A TON MORE THEN A CHARGER CAN IN THE SHORT RUN BECAUSE ITS VOLTAGE WOULD DROP TOO LOW (as compared to the battery)............ An "ideal" voltage source maintains and supples X volts regardless of current flow, in a battery versus charger situation, althoug neither is "ideal" in the short run the battery is way closer then the charger (subject to its rating of course)
Like I said the battery can deliver like 1000 amps (in the short run before its voltage drops too low) to a starter and that a veryyyyyy lowwwwwwwwwww ohm load remember, while a battery charger (subject to its size) simply CAN NOT supply anywhere near that many amps. You may see 50 or 100 amp boost chargers, but they simply cant deliver the amps a battery can to the same load (such as say a low resistance DC starter) for a brief time period, SORRY CHARLIE
***If you dont believe me, try to jump start a nearly dead battery wiht a battery charger then try it again with a battery and see the difference ****
I hear what youre saying about voltage but you arent taking VOLTAGE DROP into consideration. A part of a CCA rating has to do with the amps that can be suppled for X time BEFORE the voltage drops to x volts. AND BELIEVE ME A BATTERY CAN SUPPLY A TON OF AMPS MORE THEN A BATTERY CHARGER CAN IN THE SHORT RUN AND THATS WHAT CAN BLOW UP A 6 VOLT BATTERY
Like you I also happen to have experience and formal education in electronics, BS Electrical Engineering in 1969/1970 and now FORTY YEARS EXPERIENCE plus years as a used tractor dealer and farmer and have seen 6 volt batteries BLOW UP when jumped by a 12 volt battery
FEEL FREE TO JUMP A 6 VOLT BATTERY WITH A 12 VOLT BATTERY IF YOU WISH, BUT IN ALL GOOD FAITH AND CONSCEINCE I MUST ADVISE OTHERS TO USE A CHARGER INSTEAD AS ITS FARRRRRRRR LESS DANGEROUS (even if you dont understand why and sorry I cant explain it to you in a few sentences)
So if in doubt, I beg you to err on the SAFE SIDE and dont jump a 6 volt battery with a 12 volt as it can blow up and shoot acid in your eyes PLEASE JUST SAY NOOOOOOOO
Thanks again, fun discussion, sorry if I cant convince you and I sure cant cover an electrical course here in a few sentences, so please stay safe and whatever you do DO NOT JUMP A 6 VOLT BATTERY WITH A 12 VOLT BATTERY BECAUSE IT ISSSSSSSSS MORE DANGEROUS THEN USING A CHARGER (battery can supply more amps), ITS JUST MORE DANGEROUS AND EVEN IF YOU CANT UNDERSTAND WHY, PLEASE DONT TRY IT !!!!!!!!!!!!!
Hopefully some other electrical gents who are better teachers then myself can explain to you why its NOT safe to jump a 6 with a 12 and why its more dangerous then using a charger, (just jump the starter as I explained below).
Similar to what I always say, its your tractor and your eyes and your choice and youre free to do as you please and everyone is entitled to their own OPINIONS (but NOT their own facts) but based on my own education and experiecne its my opinion (which I argure physics agrees its a fact) ITS NOT SAFE TO JUMP A 6 WITH A 12 AND SUCH IS FAR MORE DANGEROUS THEN USING A CHARGER
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