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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#41
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Question about Auto batteries
Hi!
Years ago any car starter that drew over 70 amps, no load was considered defective. That's why I asked. With all but the largest starters, I'd say that makes sense for unloaded operation. I have a 1984 GMC pickup truck with the 6.2 diesel engine. Underhood are two 1000CA/900CCA batteries. On a cold day, without any help from the block heater, it is sometimes almost all those batteries can do to get the thing started. I cringe to think about the amount of current feeding that starter motor...probably nowhere near 900 amps, but pretty impressive nonetheless I am sure. Fortunately, it has a block heater, which makes starting it in the winter as easy as the summer. Now if only it didn't put such a big dent in the electrical bill! William |
#42
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Question about Auto batteries
David Brodbeck wrote:
Michael A. Terrell wrote: I'm waiting to see the new cars with a 42 volt electrical system, and how they handle starting in less than ideal situations. I suspect they'll start more easily, for the same reason 12 volt cars start more easily than 6 volt ones. Higher voltage means lower current, and lower current means lower resistive losses in the cables and connections. It also means that the battery cables will be a lot smaller. After all, that was their reason to go to a higher voltage electrical system. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
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