Next message: Bob Austin: "T&T: Power Tool Survey"
Wednesday, November 30, 2005, 6:01:20 PM, Mike wrote:
MM>
MM> At 05:17 PM 11/30/2005 -0800, you wrote:
>>The alternator and shore power driven charger will be set for a nominal
>>system voltage of 32V not the 36 volt of three 12V in series. Unless the
>>alternator and charger can be adjusted the three 12V batteries in series
>>will never become fully charged and this means they will sulfate more
>>quickly than normal.
MM> Arild,
MM> I think you are being overly optimistic about the sulfating problem.
MM> A 4 volt difference in charging is over 10 percent of the overall
MM> voltage. In 12 volt terms this is equivalent to charging a 12 volt
MM> battery to about 12 volts instead of 13.2 volts, which should be
MM> obvious is nearly dead as a door nail.
MM> It is not clear if this is what the orginal poster had in mind, but
MM> unless we are missing something here, the 32 volt alternator charger
MM> is going to be of less than any use at all.
MM> Regards,
MM> Mike
I think that if the OP proposes to tap this 36 volt bank to supply 12 and 24 volt loads, he really should be using three independent 12 volt chargers, one connected across each 12 volt section, to charge the whole bank. Otherwise, the bottom 12 volt section will be discharged more than the rest, by all the 12 volt loads, then the rest of the batteries will be overcharged before the bottom 12 volt section is charged.
--
Peter Bennett, VE7CEI Vancouver, B.C., Canada
Lien Hwa 28 (AKA Polaris 30) "Sea Spray"
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
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