48 VDC Negative Ground System- Need Low Voltage Disconnect

[USCGC3CEN]

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]

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

[USCGC3CEN]

Thanks!

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

Steve

[harryn]

This one might work for you.  I looked over the data sheet and manual and it didn't refer to positive vs negative ground.

https://www.talleycom.com/viewProduct?rlProdNum=DURLVD-48

Most are positive ground because 48 volt is common in telecom and many telecom systems are positive ground.  Not really sure why though.

[harryn]

Found another option for you:

ICT-power.com

- LVTs for 12, 24, and 48 volt.

- Positive and negative ground approved.

- Looks like they have a number of options for your goals.

Harry