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Sentry 12 VDC battery charger will not turn off.
July 23, 2011
9:35 am
arimkus
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March 8, 2011
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Steve,

Will do.

Al

July 22, 2011
8:47 am
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Steve Pooler
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Hi Al~

First have you read this thread ?  /forum/sentry-chargers/sentry-battery-chargers/

In your case the 12 volt Sentry only knows to shut off at 13.9 volts & come back on at 12.8…

The switch on the front must be in the Auto position & All batteries must reach 13.9 for it to shut off

The C series is an older model and it's possible it only has one sensor lead on that old board, but it's also very possible that the board has been upgraded by now….How many Red sensor leads does yours have & are each (if more than one) connected to batteries ?…If all are not connected to a 12 volt source the board will see this as No voltage & never shut the charger off.

I would not make any adjustment to the cut-in or cut-out at this point…But if you want to check the board for operation it's simple enough…Just take a jumper wire and go from any one of the + outputs over to either of the little Blue ignition cut off terminals…If the charger shuts off the board is operational…Yes it could be out of calibration but that's a pain to do, and from your readings we are not there yet…

With your house batteries only at 12.75 volts…If a sensor wire is connected to that bank it will not allow the charger to shut off until that bank reaches 13.9 volts…

What is the output amperage shown on the front panel meter ?…With 12.75 volts I would expect it to be maybe 20 amps or more if you are drawing load off that bank…If not we could have a bad Diode on that bank's output, or a bad capacitor causing low total amperage output.

To check for a bad diode…Move the house bank charging wire to an empty output, or trade places with another (each has it's own diode) if charger output increases & the house voltage starts to climb we need to replace that diode…

If you still have low output then we need to test or replace the capacitor…

 

Get back to me with what you find  Cool

 

Steve~

Edit: Guess I missed that you only have 5 amps output…Switch house charging lead to another output first & see if the voltage/amperage both don''t raise…I would also check voltage on that lead when you have it disconnected to be sure it is making good connection to the battery/s…Be sure to use the ground post in the charger for one side of your meter…We also need to be sure you have a good ground.

July 22, 2011
7:06 am
arimkus
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My Sentry charger (C140-3N) constantly charges the starboard bank (2 8D's) at 13 + volts, however the port side house batteries only indicate 12.75 VDC. I checked the cells on all four (4) batteries (2 years old) and were within spec.  Should I adjust the cut in/cut out voltage settings, replace the batteries?  The Sentry is operating as though it is on a trickle chargeed (less than 5 amps indicated on the meter) and I'm concerned about the constant operation. Any suggestions will greatly be appreciated.

Al