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From: Frank Krygowski <frkrygow@sbcglobal.net>
Newsgroups: rec.bicycles.tech
Subject: Re: Thoughts on industrial design
Date: Tue, 29 Apr 2025 11:21:38 -0400
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On 4/29/2025 8:27 AM, AMuzi wrote:
> On 4/28/2025 10:21 PM, Frank Krygowski wrote:
>> 
>> I've had two 12V battery incidents with my Kia EV. Despite having a 64 
>> kw-hr battery full of electrons (at something over 300V), the car 
>> would not start. Some parasitic loss had drained the very conventional 
>> 12V battery down to a voltage too low to fire up* the electronics. One 
>> was a complete mystery, the other was a device plugged into an outlet 
>> within the car.
>>
>> I happened to have a spare motorcycle battery on hand and charged. I 
>> used that to "jump" the car's 12V battery, and all was well. It 
>> doesn't seem to require much current to kick the electronics awake, 
>> energize the relays, etc.
>>
>> The car does have a "utility mode" in which the big traction battery 
>> tends the 12V. That's mostly intended for things like camping, where 
>> one might run lights, etc. off the 12V.
>>
>> (* Note the archaic term still in use: "fire up," as with a steam 
>> engine.)
> 
> My cars will bump start on a small incline or with two guys pushing on 
> flat ground.

Yes, I've had plenty of experience with those techniques back in the 
day. Its obviously not possible with the EV. In fact, I don't think I 
can even coast the car down a grade unless the electronics are active. 
Seems weird...


-- 
- Frank Krygowski