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Old 11-04-2012, 06:39 AM   #29
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Originally Posted by wyocowboy
So how did you get the recommended 14.8 volts Trojan wants?? Thanks Don
14.8v is more of a max voltage. Trojans can handle that voltage and therefore charge faster. Of course after they reach full charge, 14.8 will boil the hell out of them.

An old single stage charger puts out 13.6v continuously. This voltage was chosen as a middle of the road voltage. It will fully charge a battery and once fully charged, won't boil it too bad. But bad enough to warrant checking water often. So, 13.6v will charge a Trojan fine, just takes much longer.

I talked to a tech at Progressive Dynamics quite a while ago about their 14.4v 'Boost' voltage and if it could be raised to get closer to what Trojans can handle. The answer as expected was no.

14.4 was chosen as any battery can handle it. The extra 0.4v does not significantly decrease charging time up to a 90% charge. At this point the PD9200s drop to 'Normal' mode at 13.6v to reach 100% charged. Then to 'Storage' mode at 13.2v to maintain the battery with much reduced boiling and out gassing.

Finally, the PD goes into Boost mode for 15 mins every 21 hrs. They call this the Desulfation mode. It mixes the electrolite to prevent battery stratifaction, which extends battery life.

Can you tell I'm a PD fan?


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Old 11-04-2012, 10:14 AM   #30
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Set your charger on the AGM mode.

2004 32' National Sea Breeze 1311 Class A on a F-53 Chassis, CHF, TST TPMS, 5Star Tune.
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Old 12-03-2012, 09:54 AM   #31
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Just an update... I ended up replacing the old Magnetek converter with the Progressive Dynamics 60 amp converter - with remote pendant. Works really good as far as I can tell... Thanks everyone, for all the help.

1994 Holiday Rambler Endeavor LE - Engine Rebuilt and Restoration in Process
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Old 12-03-2012, 07:07 PM   #32
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Thanks for the update. I've been happy with the PD Converter I installed, apparently so are the batteries...

Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
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