NASA BMI Battery Monitor Connections

[XDC]

Clearer diagram? Probably not even the answer to the question :ambivalence:

 

[VicS]

Clearer diagram?

ITYWF It is the diagram from NASA's installation instructions and the same ( except for an added note of mine) as one I referred to in post # 19 above

 

[VicS]

Thank you so much - all diagrams help greatly so can now get this sorted. I've just bought the monitor (compact version) but the instructions did not have the Figure 2 diagram you had included in the other post. I'll probably go with the original bus bar solution. Thanks again. Nick.

Every thing said about wiring the BM1 and BM2 applies except that the Compact version ( like older BM1s ) has no provision for monitoring the engine start battery volts

 

[boatmike]

Actually the display on the meter consumes a very low amperage itself. Not sure its as much as 0.1 amp though. 0.1 amp is negligible but with a 200 amp battery bank that would take 40 days to reduce it to 50% charge. Do you have anything else on the boat with a permanent drain like a clock??? Do your batteries actually run down appreciably if you leave the boat idle for a month or so?

 

[pvb]

Actually the display on the meter consumes a very low amperage itself. Not sure its as much as 0.1 amp though. 0.1 amp is negligible but with a 200 amp battery bank that would take 40 days to reduce it to 50% charge. Do you have anything else on the boat with a permanent drain like a clock??? Do your batteries actually run down appreciably if you leave the boat idle for a month or so?

If you look, you'll see that this thread is over 8 years old, and the OP probably is no longer interested in your reply, indeed he hasn't been online here for over a year.

 

[VicS]

Actually the display on the meter consumes a very low amperage itself. Not sure its as much as 0.1 amp though. 0.1 amp is negligible but with a 200 amp battery bank that would take 40 days to reduce it to 50% charge. Do you have anything else on the boat with a permanent drain like a clock??? Do your batteries actually run down appreciably if you leave the boat idle for a month or so?

It is only 1.5 mA ( BM-1, BM-2 and BM-1 Compact all the same)

Q Do I need to disconnect my BM1/BM2 when I leave the boat
for long periods?
A No. The BM1/BM2 is designed to be permanently connected to the
battery. It is independently fused, and draws only 1.5mA from the
battery. At such a low current, it would take several years to
discharge a typical fully-charged marine service battery.