This is the product: http://www.shop.sterling-power.com/acatalog/VSR_CVSR.pdf
I stress, I don't have this fine beast. A friend has one fitted on his boat ... typically as shown on page 2 in basic 90% application drawing ...
The fuse between the device and the bow thruster battery bank blew. It was replaced. Now it appears that the led's on the unit don't light up. The unit is supposed to reset and reboot automatically upon be powered up again ..... I can't tell you why, it doesn't appear to work, its not mine, I haven't tested anything ...
What I would like to know is just what does this device actually do or protect. Does it prevent the positive feed going right to the other end of the boat overloading? I notice that the size of the cable going off to the battery bank seems no bigger than about 6-8mm in diameter (bare). I wondered if the device limited the amount of load current going through the device, and hence cable, but it just seems a wierd way to go about it. What I can't get my head around is that the total possible alternator output could be as high as 175amps yet the fuses each side of the device are 80amp? ...and it been ok for last 3 years from new??
Anyway, I'm not involved, so my asking is sheer curiosity (and as friend asked if I could help, it would be nice to be able to explain what is actually happening). I like things to be KISS.. ty for reading
Stewart