New Batteries on Princess V39 Quickly Discharge

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mag040

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Hello together,
I have a Princess V39 2017, and my new batteries quickly discharge and then show a normal voltage of 12.5V when I toggle the "on" switch of the domestic batteries on the main panel. After a short time, the voltage drops again, but it returns to normal when I toggle the switch. Did anyone encounter a similar issue before? I would guess there is something wrong with the indicators or sensors, but I haven't found a solution yet.

Best, Max from Mallorca
 
My initial reaction was to suggest fitting a Victron SmartShunt (or similar) to see what's really going on. This is surely always a good investment, but if I'm understanding correctly it may just be a problem with the voltage displayed on the meter by the chart table. Use a multimeter across the terminals of the battery - does the handheld multimeter show the same as the boat's voltmeter at each stage of your observations?
 
mag040 said:
Hello together,
I have a Princess V39 2017, and my new batteries quickly discharge and then show a normal voltage of 12.5V when I toggle the "on" switch of the domestic batteries on the main panel. After a short time, the voltage drops again, but it returns to normal when I toggle the switch. Did anyone encounter a similar issue before? I would guess there is something wrong with the indicators or sensors, but I haven't found a solution yet.

Best, Max from Mallorca
Click to expand...
You don't say where, or from what, you are reading this voltage or what is switched when you toggle the switch. I would suspect that you have dodgy connection in that circuit.
 
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mag040 said:
Hello together,
I have a Princess V39 2017, and my new batteries quickly discharge and then show a normal voltage of 12.5V when I toggle the "on" switch of the domestic batteries on the main panel. After a short time, the voltage drops again, but it returns to normal when I toggle the switch. Did anyone encounter a similar issue before? I would guess there is something wrong with the indicators or sensors, but I haven't found a solution yet.

Best, Max from Mallorca
Click to expand...
If it's the main battery switch that you are toggling, that operates a heavy duty relay. It sounds like there could be a bad contact across the relay contacts. You need to get this properly checked, it could cause a fire.
 
Thank you, everyone! We checked it and it’s definitely the battery switch on the main panel.
We took it apart and it worked perfectly afterward. Now the problem is back. I try to order a new part.

best regards, max
 
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