Post A9WTPOG9Gf4OiyDzPc by OpenComputeDesign@linuxrocks.online
(DIR) More posts by OpenComputeDesign@linuxrocks.online
(DIR) Post #A9WKxz4Q0ss39K9uIi by OpenComputeDesign@linuxrocks.online
2021-07-21T17:37:22Z
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Apparently some vehicles used to use "positive ground". So basically the POSITIVE of the battery was connected to the chassis...
(DIR) Post #A9WLCE1nCKQvasimIa by Linux_in_a_Bit@linuxrocks.online
2021-07-21T17:39:55Z
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@OpenComputeDesign That doesn't sound good...
(DIR) Post #A9WLJjwExCsgabhvLE by OpenComputeDesign@linuxrocks.online
2021-07-21T17:41:17Z
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@Linux_in_a_Bit It works so long as you A, know about it, and B, don't have to connect modern negative ground stuff to them....I A, did not, and B, did...
(DIR) Post #A9WQQ48lFw0IkkOqga by Davide_Sandini@mastodon.uno
2021-07-21T18:38:27Z
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@OpenComputeDesignPlease lists some modern negative ground stuff
(DIR) Post #A9WTPOG9Gf4OiyDzPc by OpenComputeDesign@linuxrocks.online
2021-07-21T19:11:57Z
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@Davide_Sandini Harder would be coming up with modern positive ground stuff. Everything designed for modern electrical sockets are negative ground, house electrical is ground earth referenced. Pretty much anything with an integrated circuit is negative ground. And ,then, to match, pretty much everything else is too. In my case, I've got a winch that is negative ground. But the vehicle is positive ground...
(DIR) Post #A9WW4WiquJGqkkOTXk by Davide_Sandini@mastodon.uno
2021-07-21T19:41:47Z
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@OpenComputeDesignEverything designed for modern electrical socket is designed for AC supply, both poles can be connected neutral- phase or phase- phase, indifferently. Modern fly- back DC supply is insulated 1 to 1.5 kV or more from input to output. No one can be "negative grounded", referring to input power. Do you think that USB receptacle on an electric car would be powered directly from battery, uninsulated?
(DIR) Post #A9WgjRNOggvPaSVRdQ by OpenComputeDesign@linuxrocks.online
2021-07-21T21:41:15Z
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@Davide_Sandini Ok, well, first of all, at my house at least, neutral and ground are connected together, and both are earthed. In a car (or at least mine) 12v and 0v for the stereo are connected to the battery through just a relay and a fuse, no isolation. And, on my winch at least, the case is negative grounded. So connecting it to a positive grounded vehicle causes a direct short. To be clear here, when I say "negative ground" I mean the chassis is connected to the (-) on the battery
(DIR) Post #A9YaeSO14S20Av9DaC by Davide_Sandini@mastodon.uno
2021-07-22T06:23:53Z
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@OpenComputeDesignMay be this document could help in defining the problem?http://mgaguru.com/mgtech/electric/et098.htm
(DIR) Post #A9YaeSs9GQ8NgNFHY8 by OpenComputeDesign@linuxrocks.online
2021-07-22T15:07:14Z
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@Davide_Sandini Certainly an interesting article for sure. I think in my case, I'm going to run the winch in reverse polarity instead of trying to convert the vehicle. From my understanding, because the winch has no solid state parts, and no permanent magnets, it will function identically in either polarity (except, you know, not shorting the battery).
(DIR) Post #A9ZbVT0Nh9WwbHKUoS by matt@linuxrocks.online
2021-07-23T07:26:49Z
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@OpenComputeDesign nothing inherently wrong with that, just depends on your components.Consumer microwave ovens do the same thing actually.
(DIR) Post #A9aG04fsCcNyHct2au by OpenComputeDesign@linuxrocks.online
2021-07-23T15:00:34Z
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@matt True. Sucks when you have to connect something with a negative ground, though. Especially when you don't know about it, and go to hook it to the battery, when... TZZAP!!! Didn't help that it was a big 24v system. 24v at over 1000A makes a hell of a spark