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03-19-2018, 11:07 AM
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#1 |
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Gone Wild
Join Date: Dec 2017
Location: Montreal, Quebec, Canada
Posts: 1,130
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48 volt digital battery meters
Why do some have 2 wires and others 3 wires?
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03-19-2018, 11:25 AM
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#2 |
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How Can I Help?
Join Date: Oct 2009
Location: SW Wisc & West Central, FL
Posts: 1,385
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Re: 48 volt digital battery meters
Analog meters just need the voltage. The LED/Digital ones need the power source to light up, so the extra terminal is for key on signal.
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03-19-2018, 11:39 AM
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#3 |
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Crazy Wild
 Join Date: Jun 2015
Location: Carolina Lowcountry
Posts: 796
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Re: 48 volt digital battery meters
2 wire dvm's use whatever power they are reading as its power source.
3 wire dvm's use a seperate power source. For example, you can monitor a 12v battery using 48v power source. |
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03-19-2018, 11:44 AM
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#4 |
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Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: 48 volt digital battery meters
Specifically about 2 and 3 wire digital voltmeters, the 3 wire models require a lower + power supply voltage to operate the internal electronics (they can read a higher voltage than the supply using the additional + wire).
The 2 wire models are more convenient as they can measure and be powered by the same voltage levels. |
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03-19-2018, 11:48 AM
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#5 |
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Gone Wild
Join Date: Dec 2017
Location: Montreal, Quebec, Canada
Posts: 1,130
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Re: 48 volt digital battery meters
Thanks, Guys!
My friend has a 2 wire 48 volt digital volt meter he's giving me next week. Here's hoping it goes to 50.9....lol. I gather it can be run through the ignition so its not lit up all the time. |
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03-19-2018, 12:17 PM
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#6 |
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Crazy Wild
Join Date: Jun 2015
Location: Carolina Lowcountry
Posts: 796
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Re: 48 volt digital battery meters
Red wire to keyed side of switch.
Black wire to battery pack - or b- on controller. |
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03-19-2018, 12:34 PM
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#7 |
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Gone Wild
Join Date: Dec 2017
Location: Montreal, Quebec, Canada
Posts: 1,130
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Re: 48 volt digital battery meters
 Thanks! |
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04-02-2018, 04:31 PM
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#8 |
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Gone Wild
Join Date: Dec 2017
Location: Montreal, Quebec, Canada
Posts: 1,130
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Re: 48 volt digital battery meters
What side would be the "keyed" side? I have a green wire and a blue wire
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04-02-2018, 04:35 PM
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#9 |
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Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: 48 volt digital battery meters
The Green is always ON.
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04-02-2018, 04:42 PM
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#10 |
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Gone Wild
Join Date: Dec 2017
Location: Montreal, Quebec, Canada
Posts: 1,130
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Re: 48 volt digital battery meters
Green it is! Thanks, Sergio!
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