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03-16-2017, 08:52 AM | #21 | |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: More Voltage Reducer questions
Quote:
All negative connections must be made on the Controller B- side of the OBC in order for the OBC to measure the discharging current (the OBC uses a Coulomb counting method, Ie: Energy In vs Energy Out). Your Dealer did not use a Voltage Converter so he is tapping 2 batteries to produce 16v for the accessories. This can easily lead to a premature failure of your entire pack depending on how much current is being used, but it saves the Dealer money. Don't be fooled by the blue wire being connected to a negative battery post, if You follow the big cable connected to that post, it is also connected to the positive battery post of the previous battery which gives you +16v as measured from pack negative. Once You get your Madjax converter wired up to +48v, just move that blue wire to the +12v output of your Madjax converter and your batteries will last a lot longer. |
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03-16-2017, 12:06 PM | #22 | |
Not Yet Wild
Join Date: Oct 2013
Posts: 18
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Re: More Voltage Reducer questions
Quote:
Also, why does that wire show voltage when I touch my positive voltmeter prob to it and the negative to a negative battery post. |
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03-16-2017, 12:24 PM | #23 | |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: More Voltage Reducer questions
Quote:
You only need one wire (12ga) from the black accessory wire (yellow bullet) to your fuse block. Every other negative accessory wire, as well as the negative wires from the Converter will just go to the fuse box. |
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03-16-2017, 12:43 PM | #24 | |
Not Yet Wild
Join Date: Oct 2013
Posts: 18
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Re: More Voltage Reducer questions
Quote:
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03-16-2017, 12:51 PM | #25 | |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: More Voltage Reducer questions
Quote:
There is only one pack negative battery post, that is the negative post that has the negative cable that goes through the OBC. |
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03-16-2017, 12:52 PM | #26 |
Not Yet Wild
Join Date: Oct 2013
Posts: 18
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Re: More Voltage Reducer questions
Sorry I just mean if I touch the voltage meter to the black wire with Yellow bullet connector and a negative side of any battery.
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03-16-2017, 12:57 PM | #27 |
Not Yet Wild
Join Date: Oct 2013
Posts: 18
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Re: More Voltage Reducer questions
Although if I test between the black wire with Yellow bullet connector and the main battery negative (on that goes through OBC) I see zero volts.
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03-16-2017, 01:02 PM | #28 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: More Voltage Reducer questions
Everything is fine, That is how it should work.
The batteries are connected in Series, so for every battery that you move up from pack negative, it adds approximately 8.5v to your voltage reading. |
03-16-2017, 01:17 PM | #29 |
Not Yet Wild
Join Date: Oct 2013
Posts: 18
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Re: More Voltage Reducer questions
Thank you Sergio, I think this makes sense now.
I'm going to change my fuse block negative to run from the Black wire with yellow bullet connector and then run the voltage reducer ground to a negative on my fuse block. I will then wire my lights directly to the fuse block. sound good? So the lights were basically pulling power through the battery cable connected to the negative battery terminal that it was connected to? |
03-16-2017, 06:20 PM | #30 | |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: More Voltage Reducer questions
Quote:
The lights were pulling power from the first 2 batteries, which would cause those 2 batteries to get out of balance with the rest of the batteries from the pack. The best way to get longevity from your battery pack is to draw power evenly from all batteries, that means a 48v->12v converter as you have installed now. |
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