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Service Batteries - run out of charge

M

mpolonia

New member
I have a Cranchi-41 (with 2 VOLVO PENTA KAD44) and in the last few days the "service batteries" run out of charge after a few hours of sailing...
My mechanical has been checking, battery to battery and says they are good, He also checked the alternator in progress and says it loads, but what is certain is that after 2 hours of sailing they are very weak (the Radar stops working, I am unable to use the toilet pump, the flaps do not go up/down, etc. ...).
Can someone give me a tip/light on what to do more?
 
When you use the engines how long do you run them ?----I know from my sailing days that 12 volt fridges use lots of battery capacity quickly.-----When racing , the race rules allow for running engine in neutral for battery charging.----Has to be documented.
 
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