Why is the screen of my BM-1 Compact blank?
Check the wiring is correct and securely terminated.
Check the fuse, and check that the battery is not completely flat.
Why does my BM-1 Compact show that the number of hours
remaining is high or low when a constant discharge
current is flowing?.
The actual battery capacity is different from the value you have
entered in Engineering. The reasons for this difference have
been discussed above. Adjust the battery capacity in
Engineering to match the battery.
My battery is made up of a bank of several batteries.
Is that a problem?
Not as long as the combination produces a nominal 12 volts,
and all the current drawn from the bank passes through the shunt.
Can the BM-1 Compact monitor my engine starting battery as
well as my service battery?
No, it cannot. The service battery is in continuous use, and so
needs continuous monitoring. The starter battery, however, is
subject only to periodic heavy loads followed by float charging,
and so does not need to be monitored.
I have another voltmeter on my vehicle which shows a different
value to the BM-1 Compact indication.
The BM-1 Compact very accurately measures the voltage
directly across the battery terminals. Other voltmeters may
read differently owing to volt drops in the wiring.
Why does my BM-1 Compact show a higher capacity
immediately after charging than it does after a few minutes'
discharging?
This is an unavoidable feature of battery chemistry, which
varies from battery to battery, and the charging regime used.
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QUESTIONS AND ANSWERS
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