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Old 09-11-2019, 05:44 AM   #1
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24 Volt Displaying weird amp readings

My Selene 53 is having an electrical issue. Looking at the breaker panel it shows the amp meter bouncing from a plus 15 amps or so to a fluctuating minus. -136.6 is an example. Thoughts.Click image for larger version

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Old 09-11-2019, 07:36 AM   #2
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HIghly suspect the meter. Other possibilities do exist.
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Old 09-11-2019, 07:59 AM   #3
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-136 amps at 24 volts is a very large load. Bigger than a windlass. So as long as there is nothing like that running, then its an instrument problem.
What does it read with all loads shut off and battery charger off?
Do you know if the meter uses a shunt or a coil?
Trace the leads from the meter. Check for loose connections.
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Old 09-11-2019, 10:04 AM   #4
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Quote:
Originally Posted by High Wire View Post
-136 amps at 24 volts is a very large load. Bigger than a windlass. So as long as there is nothing like that running, then its an instrument problem.

What does it read with all loads shut off and battery charger off?

Do you know if the meter uses a shunt or a coil?

Trace the leads from the meter. Check for loose connections.


What does it read with all loads shut off and battery charger off? The same to a point. It does go up or down quite a bit. Sometimes it just reads normal.
Do you know if the meter uses a shunt or a coil? I donít know but can easily check.
Trace the leads from the meter. Check for loose connections. Will do
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Old 09-11-2019, 10:14 AM   #5
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first turn off your inverter
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Old 09-11-2019, 10:18 AM   #6
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first turn off your inverter


Yes, I have. Their are a total of 3 and all are switched off. I have also turned off the mains with the same results showing on the display. Right now we are connected to shore power but it also comes and goes with genset running and cruising.
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Old 09-22-2019, 07:29 AM   #7
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Check your meter, it may be bad.
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Old 09-22-2019, 07:51 AM   #8
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The Selene owner's site may point you towards the problem, especially if reading is correct. Some years ago we spent time discussing electrical issues with a few Selene owners, this one sounds vaguely familiar. Also, turning off your inverter does not bypass it. An inverter bypass switch is a nice to have when trouble shooting.

JS, it has been over 10 days now - what was the problem?
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Old 09-22-2019, 09:55 AM   #9
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Ammeter may actually be a voltmeter reading the voltage drop on a shunt (very low ohm resistor). If a poor connection on the shunt, the volt drop can swing wide even though the amps are normal. Trace meter leads and see if they go to a shunt.
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Old 09-22-2019, 10:01 AM   #10
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24 Volt Displaying weird amp readings

Ski is correct. Here is some detail.
http://i1.ytimg.com/vi/7MGed7WKwAA/hqdefault.jpg

The black thing is a very low value resistor

The meter is a sensitive voltmeter, that has a scale marked in Amps. Note exactly 4 wires connected to the shunt. Two large, two small. It should be in the NEG side of the battery bank
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Old 09-22-2019, 10:17 AM   #11
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Originally Posted by Ski in NC View Post
Ammeter may actually be a voltmeter reading the voltage drop on a shunt (very low ohm resistor). If a poor connection on the shunt, the volt drop can swing wide even though the amps are normal. Trace meter leads and see if they go to a shunt.
Ski, although you may be correct, the volt meter to the left is reading 27.7 which is normal. His inverter monitor/BMK setup (if so equipped) should be able to discern accurate amp draw, hopefully the same as meter shown. The "amp" meter may well predate the inverter install
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