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Old 02-03-2012, 18:43   #1
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Question Wiring VSM-422 Battery Monitor

Blue Sea Manual for VSM-422 is a little vague on wiring. It says the Shunt can be wired with a twisted pair. ABYC says you can use this if in a bundle, instead of 16 ga. I have some high quality Cat 5 cable which is 5 twisted pairs in an insulated sheath. In addition to the shunt, the VSM-422 has Voltage detection for Batt 1 and Batt 2, and a battery temperature sensor. My question is whether the other tiny twisted pair wires would be suitable for the voltage sensors and temperature sensor. Your experience would be appreciated.

Rewiring a 1980 Nordic 44 from scratch- ripped everything out.
harborhobo is offline   Reply With Quote
Old 02-03-2012, 23:07   #2
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Join Date: Mar 2007
Location: San Francisco
Boat: Tayana 52, AC
Posts: 69
Re: Wiring VSM-422 Battery Monitor

Just finished installing my VSM a couple weeks ago. I asked the same questions. I found twisted 18 guage wire at a local electronics store that sold, installed and repaired ham radios. The wire is not "marine grade", but it is a short (less than 10 feet) run that is well protected from vibration/damage/moisture/etc. I installed the shunt and temp sensor next to my house bank negative, and added a new negative bus after the shunt in order to "consolidate" any/all grounds pre-shunt. So battery negative-shunt-negative bus. I was told that I should use 18 or 16 gauge twisted wire for the shunt (by a marine electronics store); they recommended manually twisting the wire if I didn't have any pre-twisted. The temp sensor wire...I used 20 guage, and did not twist. So far, all seems to be working flawlessly.

Also, I wired a relay into my NovaKool refrig/freezer system, and now monitor my "Refrig Status" instead of a bilge pump. Very nice to know my NovaKool is running 19-22 minutes/hour and cycles on and off, on average, 48 times per 24 hours. Works out to 2 amp/hours x 24 hours = 48 amps out of my 12 volt system. With this info, I have a very clear picture about my solar next big project. Hope this helps.

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battery, monitor, wiring

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