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Old 04-08-2015, 03:04 PM   #11
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I think you mean WFCO
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Old 04-08-2015, 04:11 PM   #12
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Thanks for the replies.

Rethinking this and looking at the Interstate battery specs they want 14.4v for bulk charging. The crazy part is they want 15.3v for absorption. No converter charger can do this.

I think I'll get the PD 70amp unit so I can force it to 14.4v for fast bulk charging to 80% and then let my Blue Sky solar take over for the absorption at 15.3v. When in storage the Blue Sky will maintain the batteries.
I looked all over the interstate site for this and all i could find was a 14.7v aborbtion rate for the "U" series deep cycle and none for the GC2-XHD you would probably replace with...can a guy get a link?
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Old 04-08-2015, 06:25 PM   #13
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Crocket PDF file attached with battery and charging specs. I have the Costco batteries which are the GC2-RD 208ah battery. The GC2-XHD have the same charging specs.

Learjet, yes WFCO. Thanks. Not sure why this forum only allows editing posts for a short amount of time.
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File Type: pdf Interstate GC2 charging instructions.pdf (147.1 KB, 33 views)
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Old 04-08-2015, 08:42 PM   #14
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appreciated...news to me. dont know of a converter to accommodate you better than the new switch modes (a.k.a smart charger).
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Old 04-08-2015, 10:42 PM   #15
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I have exhausted my search for a converter/charger that is capable of giving the 15.3v absorption charge required by my Interstate 6v GC2 batteries. It doesn't exist. When dry camping I will only use the converter on generator power to bulk charge to 80% and let the solar take over which will provide 15.3v absorption and hold it for two hours.

Will the PM boondocker 55w converter really provide any benefit over the WFCO 55w converter for bulk charging to 80%? I'll never let these batteries get below 50% and most likely won't go below 80% assuming I start the evening with a full charge.

My converter will most likely only come into to play during a string of cloudy days.

How many more amps will a PM boondocker put out during bulk than the WFCO?

Oh and I'm not sure the 75a PM boondocker is a good idea for a 208ah bank.
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Old 04-08-2015, 11:27 PM   #16
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ive sold the pd 9100 series for years. had maybe one fail. power max is relatively new. centurion was probably the only coverter with a worse rep than WFCO. so your old converter wasnt the worst
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Old 04-08-2015, 11:53 PM   #17
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appreciated...news to me. dont know of a converter to accommodate you better than the new switch modes (a.k.a smart charger).
Do you meant the PD converter with charge wizard?
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Old 04-09-2015, 02:01 AM   #18
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Yeah...parallax was going to come out with a fully automatic for years then PD did it finally with the 9200 series. I shied away for that reason but the 9200 have been out for a while and Ive heard of no issues and are they are endorsed well here so Id prolly go with that. You have some selective charging choices with that as well with the pendant option.

Edit: you shouldnt need over the 70 amp. PD put a 20 amp plug on their 80 amp unit though it only draws 1300 watts, 50 more than the 70.
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Old 04-11-2015, 01:35 PM   #19
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So my Wyco 55a converter has the problem that most have and it won't go into boost mode.
How do I determine whether I have the problem before I find myself on the road with a dead battery?



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Old 04-11-2015, 01:41 PM   #20
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... When dry camping I will only use the converter on generator power to bulk charge to 80% and let the solar take over ...
I don't have solar and don't expect to but how do you tell when your converter switches from bulk to absorption?



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