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Old 05-25-2018, 06:29 AM   #1
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Converter breaker tripped

We are on a trip alternating between dry camping and full hookups. Two days ago we arrived at a site with full hookups. AC running, refrigerator automatically going to electric from propane, hot water heater on electric, etc. Everything seemed fine.

I have a Victron battery monitor so I can see state of battery and rate of discharge at all times. When we arrived batteries were at full charge. This morning I checked and battery was down to 11.9 V(!). It turned out that the breaker for the converter had tripped. I reset the breaker and it has been running for over 45 minutes now. The monitor shows a healthy Amp rate into the battery.

Several questions maybe someone here can answer:

1. What drain on battery is created by an inoperative converter while connected to shore power?
2. What would cause breaker to trip?
3. The monitor only showed a 74 A-Hr drain when I checked it.I have two AGMs rated at 100 A-Hr each so that would not be enough to pull the voltage down to 11.9 V. Should I take that voltage seriously?
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Old 05-25-2018, 10:02 PM   #2
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shore power to Converter.. no charging... You may not know how long it was 'off'...

The controls for appliances may use 12VDC... and will pull the batteries down..

Then there is the possibility either a battery or the converter is misbehaving..
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Old 05-25-2018, 10:45 PM   #3
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Your converter will run 120 volts ac and 12 volt dc . Something as you said tripped the main breaker which would have shut down your 120 volt side or in this case shore power, your converter would take over running everything on 12 volt dc , except for your AC which if you tried to run it your Dometic control panel would give you an error code = E 7. So your where running everything off your batteries without realizing it, and that would drain your batteries.

If you have a 30AMP service it sometimes takes less that what you would think to shut off your shore power, say make coffee have the hot water on electric and run the furnace and so on. It probably tripped and you did not realize it.
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Old 05-27-2018, 08:43 AM   #4
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It was not the main breaker that tripped, only the breaker for the converter. And only one leg of that breaker.

We have been back on shore power for several days now. Everything seems to have returned to normal. The literature that came with the Lifeline AGM batteries I have says that a voltage of 11.9 would indicate a 60% discharge . Yet, the Amp-Hrs would indicate only a 37%. The discrepancy bothers me but I will just have to assume the voltage/discharge relationship is not that exact.
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Old 05-27-2018, 08:58 AM   #5
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There are probably a couple of things going on here.

1) the voltage you saw was *NOT* float voltage. It was voltage with the fridge and water heater control boards pulling some power, the propane detector pulling a little power, lights and anything else that was active on the 12v side pulling a bit of load. That's going to result in a lower voltage reading than the "float" voltage that'll give you a guesstimate of state-of-charge. You'd need to let the batteries sit with zero load for a bit to get a real float voltage.

2) (this is a guess) your battery manager may be correcting somewhat for that portion of battery capacity you really shouldn't use. Pulling all the amp-hours the battery will supply before 12v devices don't have enough voltage to operate property really shortens battery life, even for AGMs, so the Victron may be reading usable capacity instead of total. I don't have one of these thingos (it's on the upgrades list) so I don't know exactly how it computes the capacity it's displaying, again that's just a guess.
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