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Old 01-21-2015, 11:32 AM   #1
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Battery Charging Volts

Have Sunseeker class c - get 13.1 volts to the coach batteries from alternator and get 14.2 volts when on shorepower. Wondering if these are the normal expect values.
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Old 01-21-2015, 11:55 AM   #2
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Sounds reasonable.
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Old 01-21-2015, 12:06 PM   #3
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Quote:
Originally Posted by justbob View Post
Have Sunseeker class c - get 13.1 volts to the coach batteries from alternator and get 14.2 volts when on shorepower. Wondering if these are the normal expect values.
justbob,

In my opinion, the alternator charging voltage should be higher than that. More like in the 13.6-14.2 volts range. Especially without any substantial loads on, like HVAC blower on higher speeds, headlamps on, etc...

EDIT: A lot of factors come into play though in the charging system output from the alternator: Load, Engine speed, Battery condition and how new a chassis it is becuase in real late model vehicles the computer has a lot of control over voltage output so it can control the amount of load the alternator is placing on the engine. END EDIT

The shore power voltage would appear to be exactly what I would expect when you first plug up and then it could/would subside some if you have a multi-stage charger in your convertor. Again, just my opinion.

I am not saying your alternator is bad, but I would definitely investigate further as that charging system output voltage seems on the low side and could very well be the beginning of an alternator getting weak or failing.

Ashley
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Old 01-21-2015, 12:38 PM   #4
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Charge voltage should go up slightly at higher rpms. When checking charging voltage, increase the engine speed to around 2K rpms and use that figure for reference.
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Old 01-21-2015, 12:42 PM   #5
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13.1V is about right at idle. This is why you accomplish very little trying to charge a vehicle battery with the vehicle idling.
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Old 01-21-2015, 01:47 PM   #6
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Thanks for the responses - just wanted to make sure everything was ok. Looks like it is.
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