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Garden Tractors Discussion Forum

Re: Charging Coils For Small Engines

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Author  [Modern View]

03-05-2013 08:11:49

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So does that mean that it's ok to charge a 12 volt battery , no matter the batterys age or condition , with 30 volts DC, regardless if it's comming from a regulated or not or a full or half wave bridge source ?


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joe csuti

03-05-2013 13:19:28

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 Re: Charging Coils For Small Engines in reply to Whizkidkyus, 03-05-2013 08:11:49  
NO-IT IS NOT ALRIGHT to charge a 12v battery with 24-30V DC source regardless if regulated/unregulated,doing so can cause battery to boil & possibly explode.

As Hal said normal charging voltage is 14-14.5v for a regulated system & 14-15.5v for an unregulated system,normal charging voltage for 12v lead acid batteries is normally 2-2.5V more that voltage rateing of battery,most eng mfg service manuals tell you if charge voltage in a regulated system over 15V DC to replace regulator/check alt stator.In an unregulated charging system the charging voltage can run 14-16v DC,this is after you subtract 1.1-1.5v drop thru inline diode from AC voltage of alt stator output & any possible current limit/voltage drop resistor after inline diode,this is why battery life is somewhat shorter with an unregulated system as battery is maintained at a full charge/slighty overcharged condition most of the time.

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