BM2 MALFUNCTION .

[clyst]

Hi guys , Help needed . A few days ago .I connected my tablet to a 300w inverter and plugged it in to the boats 12v system ..... a set up iv used many times before albeit with a different tablet . All went well. With the charge but on glancing to the BM2 It was indicating 8.5V with a little alarm bell showing . I quickly did a drop test on the house batteries ( a set of four trojan t145s ) and all batteries were show 12.8V ish . Turned leccy master switch off to see if the BM would settle down and reset but still. Showing between 8 and 11v showing little charge amps presumably because the house batteries are fully charged . Anyone any idea what went wrong or indeed whats still wrong or is the meter just simply buggered ? Regards Terry

 

[fredrussell]

Can’t help I’m afraid but Nasa are renowned for their after sales support, well worth giving them a ring.

 

[Iliade]

[Edit: Oops, Mine was the sterling ABNRC one. In my defence, they do offer a BM-1.]

Mine went much the same way very soon after purchasing unused s/h from here. It failed at sea, miles from anywhere, while under engine. Initially caused some mild consternation...

 

[VicS]

Hi guys , Help needed . A few days ago .I connected my tablet to a 300w inverter and plugged it in to the boats 12v system ..... a set up iv used many times before albeit with a different tablet . All went well. With the charge but on glancing to the BM2 It was indicating 8.5V with a little alarm bell showing . I quickly did a drop test on the house batteries ( a set of four trojan t145s ) and all batteries were show 12.8V ish . Turned leccy master switch off to see if the BM would settle down and reset but still. Showing between 8 and 11v showing little charge amps presumably because the house batteries are fully charged . Anyone any idea what went wrong or indeed whats still wrong or is the meter just simply buggered ? Regards Terry

It sounds like BM is reading the volts incorrectly.

Check the reading with a reliable multimeter. . . . . . You can check the multimeter is giving a sensible reading on your car battery . . . . . Check the fuse / fuse holder , they are known to be troublesome

Check all the BM connections

 

[Richard10002]

IIRC, I recall having to remove and replace the fuse on my BM2 in order to reset it, when something like this happened.

 

[clyst]

Thanks for all your replies chaps . Checking all connections and fuse on next visit to boat in a day or two .Will report back ..

 

[clyst]

Thanks for all your replies chaps . Checking all connections and fuse on next visit to boat in a day or two .Will report back ..

Hi haps removed the complete unit reconnected the following day and everything is back to normal . Thanks .