convertor

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DonTom

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Has anyonr had any experience with a PowerMax-50 convertor/charger, it is a 3 stage charger. The good/bad/ugly please.
I think these days, you will find all the 3 stage converters to be around the same quality and work similar and such.

40 years ago, that wasn't so true, but things have changed a lot since then.

-Don- Reno, NV
 

Ex-Calif

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Mark_K5LXP

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I looked at these but wanted clarification of the modes as shown in the graph in the owner manual. "Voltages may vary" -? And "time" with a squiggly line to indicate indeterminate. So I used the contact link on the web page and got response back to call for more information, with a phone number. I called it and got an automated message saying "voicemail is not set up, goodbye". I left it at that, with the notion that with all these converters you pays your money and get what you get, no user serviceable parts. FWIW I have reached out to a number of converter sellers and the response hasn't been much better, usually just a comment that whatever is in the spec sheet is what you get. I'm guessing all of these are just rebranded chinese products and likely the supplier doesn't know the specifics anyway. Of all the ones I looked at the Progressive Dynamics units with the pendant looked the most useful. For the money the pedestrian converters targeted to the RV market are generally OK and way better than the single stage analog and SMPS units of yore. If you want truly supported and user configurable equipment look at marine grade stuff for 4-8X the cost.

Mark B.
Albuquerque, NM
 

Ex-Calif

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For the money the pedestrian converters targeted to the RV market are generally OK and way better than the single stage analog and SMPS units of yore. If you want truly supported and user configurable equipment look at marine grade stuff for 4-8X the cost.

Mark B.
Albuquerque, NM
What you said...
 

Gary RV_Wizard

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At our Silver Springs FL home
Yeap, no support and an utterly disposable product. That's a big chunk of the low price. The rest is cheap electronics, which yield a decent level of function and service life at low cost. The Powermax seems to have the usual features of a modern 3-stage charger.

A Progressive Dynamic 9260 is almost 2x the price. The WFCO 9855 is only about $20 more than the Powermax 55, though, and has a well-known brand name behind it. Your call.
 

CharlesinGA

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50 miles south of Atlanta, GA
Yeap, no support and an utterly disposable product. That's a big chunk of the low price. The rest is cheap electronics, which yield a decent level of function and service life at low cost. The Powermax seems to have the usual features of a modern 3-stage charger.

A Progressive Dynamic 9260 is almost 2x the price. The WFCO 9855 is only about $20 more than the Powermax 55, though, and has a well-known brand name behind it. Your call.
The WFCO products, in my limited experience and what I have read, are JUNK. I pulled out a WFCO 9845 from my trailer. It was mounted in a special made tray WFCO sells with it to replace the converter in a Parallax panel. I think it was fairly new, not sure, but after monitoring voltages for a number of days, I found it does not cycle thru the stages as it is supposed to, never dropping to the lowest voltage. I removed it and ditched it in favor of a Progressive PD 4645 and it (on the same battery) cycles very nicely thru the stages as the mfg graph shows it should. It has the advantage of a new DC fuse panel with the LED and push button to force the converter to different stages manually. This is useful if you want to top a battery using a generator and have limited time to do so and want to force it to bulk charge 14.6v to get it charged faster than the lower voltages it might automatically select.

Boondocker Converters

The Power Max 3 linked to at Amazon, above in post #3 is, according to Best Converter, an obsolete model, and all PM3/4 series are discontinued in favor of four stage units.

Charles
 
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