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Subject: electrical help

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stevej    Posted 11-06-2018 at 12:57:30 [URL] [DELETE]        [Reply] [Email]  
  • electrical help
  • A bit of a long post here. Sorry but I'm in over my head here and need some knowledgeable advice (JMOR/Soundguy,others?). I have a 2015 Polaris 570 EFI Sportsman ATV. It's has 110 miles on it and the OEM battery (about 190CCA/12amh)went bad. They are known for this. This model has all kinds of issues with cranking and start up because of the large single cylinder motor and seemingly anemic OEM battery designed for it. After looking up some of the solutions other have come up with I installed a larger Duracell 325 CCA 19 Amp Hr AGM battery which solved the start up issues. I was informed that with the type of charging system on a Polaris (Stater 3 phase AC maximum output at high RPM's of 55 to 60, that flows to a combination 50 amp rated Rectifier/Regulator) That the charging system was only designed to keep up and not fully charge the battery like a alternator does. On the Polaris forum it was suggested that I might have installed too big a battery and that the system might constantly try to charge the battery and heat up and eventually fail and take out parts if not all of my electrical charging system depending if the rectifier failed in the open of closed position. I was told I need to know the Watts out of the stater and my batteries optimum charge rate ( I believe it's 2amp or less) to be sure about the battery size. Electrical theory and math is beyond my abilities. Thanks in advance.

    Island Mike    Posted 11-06-2018 at 17:46:05 [URL] [DELETE]        [Reply] [Email]  
  • Re: electrical help
  • Couple of things. You obviously need a battery big enough to meet the starting requirements. It is best not to exceed 10% of the battery amps when charging.
    A charger with a 2 amp auto function can be used. However, for these small batteries it is best to use a battery tender, when the vehicle is parked. Typically they charge at about 1 amp. The battery can be left plugged in. I have one that gets plugged in for about 5 or 6 months every winter. Battery is from 2006.
    It has two 500cc high compression cylinders.

    All above is for bikes, but yours is similar. The last battery for a 900cc high compression 3 cylinder bike, was 14 amps. They do not state the CCA.
    I am not familiar with anything on your putt putt.

    I check the battery at rest. 12.7 volts. Turn the key on 11.7 volts. Press the start button 10.7 volts. At idle 13.5 and on up to 14.5 with more revs.
    Newer bikes have the headlight come on, when the key is turned on. A good battery should still be able to crank the engine. But if the battery has dropped to half charge while sitting, there could be problems. Half flat is 12.25 volts. I check the volts often on all the bikes to get to know the battery state.

    Island Mike

    iowasteve    Posted 11-06-2018 at 19:27:22 [URL] [DELETE]        [Reply] [Email]  
  • Re: electrical help
  • Thanks for your input. I do keep the quad on a battery tender.

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