Author Topic: 48 VDC Negative Ground System- Need Low Voltage Disconnect  (Read 63 times)

USCGC3CEN

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48 VDC Negative Ground System- Need Low Voltage Disconnect
« on: June 26, 2017, 07:41:55 AM »
Not sure why, but most 48VDC LVDs are for positive ground systems. We need an LVD for a negative ground to protect our batteries at an unmanned remote site in Alaska. Load current draw is less than 5 A.

Can anyone suggest a source or sources of supply?

Steve

United States Coast Guard

ClassicCrazy

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Re: 48 VDC Negative Ground System- Need Low Voltage Disconnect
« Reply #1 on: June 26, 2017, 12:02:28 PM »
Maybe check with this place  - seems like they would know or maybe have what you are looking for .

https://www.poweringthenetwork.com/uncategorized/negative-48-volt-power-what-why-and-how/

Looks like this would work - says it can be grounded either polarity
https://www.poweringthenetwork.com/unity-low-voltage-monitor/

Larry
« Last Edit: June 26, 2017, 12:04:52 PM by ClassicCrazy »
system one
Classic 150 , 20 Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system two
Classic 150 ,5s 135 watt Kyocero , 16s Calb 100AH LiFePO4 , Outback VFX 3648 inverter
system three
Midnite KID MPPT 24 DC in to  12 volt AGM batterie

USCGC3CEN

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Re: 48 VDC Negative Ground System- Need Low Voltage Disconnect
« Reply #2 on: June 27, 2017, 03:51:43 PM »
Thanks!

I have contacted NewMar and asked a few questions. Their LVD 48-30 would be ideal, but it is positive ground only. 

Steve