Different question on wfco

cdcorpe wrote:
No, this one http://www.bestconverter.com/75-Amp-4-Stage-Main-Board-Replacement-_p_559.html#.VaBtGjY5JqM

Looking at the possibilities for product identification and specs some more. OP please clarify one more time, thanks!

The one you have is the one with the half open casing that goes in the lower portion of the power centre, and is not a deck mount with a full casing?

It says PMPC-75 on its label? No other model name ?

OP said his was not a Boondocker after all, but a straight PowerMax. How can you tell that? Note that PowerMax has the "PM3-75-MBA" but did not make a PM4 version of that.

Meanwhile, Randy sells a "second generation" version he makes, that is 4 stage that he calls PM4B-75-MBA, not a PMPC.

So how can you have a 4 stage one that is not a Boondocker? Seems impossible.

You might have received a PM3-75-MBA by mistake but it does have 3 stage and may or may not have the 15 minute thing (some later production PM3s do have the 15 min thing.)

But yours has some kind of 15 min thing and says PMPC on it, but acts like a single stage, and is (???) a PM not a Boondocker -again, how do you know that?

This should be possible to clear up, but the OP has to be very exact in his description (no typos! :) ) and in the testing results to solve the mystery.

Once that is all clear, then it should be easy to resolve.

What you really want is the adjustable voltage PMBC but it is a deck mount not a lower portion replacement. Then you could hold it to whatever voltage you like for as long as you like to save generator time.

No idea how you could trade that in now, unless it is indeed the old version without the 15 minute thing and you have proof you paid for the new version---but it did some sort of 15 min thing you said. VERY confusing! :(

I will try your test tomorrow. When I called wfco(before I bought the PW) They had me do the same test & it did & got 13.6 volts & they said that showed everything was ok, I asked about the 14.4 volts & got no good answer.

cdcorpe wrote:
No, this one http://www.bestconverter.com/75-Amp-4-Stage-Main-Board-Replacement-_p_559.html#.VaBtGjY5JqM

Ok, so now we have a mystery. Meantime, at least you can do the voltage drop test described earlier.

It could be explained by saying you have the earlier version, which did not have the "15 minute thing" so would only go into boost if the batts were below 50% same as the WFCO. Later on, PM adopted the Iota type "15 minute thing" to get rid of that, so it would do boost at least for 15 minutes no matter what your battery SOC.

What we have here is a conflict between that idea and your report that it did some sort of 15 minute thing going from constant 74 amps to 35. The conflict is now that to do that the batts would need to be at 75% or whatever and not at 50%.

Back to square one. Batteries to 50% (for sure using voltage and SG) then converter to battery using short fat wires and time what happens.

(Idea being there might still be an "issue" with the connections/wiring as it is now, that we need to eliminate before declaring the unit itself is at fault)

No, this one http://www.bestconverter.com/75-Amp-4-Stage-Main-Board-Replacement-_p_559.html#.VaBtGjY5JqM

cdcorpe wrote:
Thanks it does not show on the receipt what the model was but the price matches the 4 stage power max & a Onboard Desulfator that he recommended+ shipping. He was recommended on this site as someone how would solve your converter problems. I didn't see anything except the 4 stage power max then or now.

He has this, which he says is only 13.6v. Is that what you have?

http://www.bestconverter.com/Showroom-Vehicle-DC-Power-Supply_c_168.html

Thanks it does not show on the receipt what the model was but the price matches the 4 stage power max & a Onboard Desulfator that he recommended+ shipping. He was recommended on this site as someone how would solve your converter problems. I didn't see anything except the 4 stage power max then or now.

cdcorpe wrote:
I bought it about 7 month ago from best converters & he recommended this charger because of my my complaint that the wfco 55 amp never went into boast like was supposed to. & I had to run the generator for ever just to get thru the next day.

Yes, but I am trying to pin you down on just exactly what you bought. If you got the single stage Randy version car showroom charger, then that is not what you needed obviously.

What you do truly need is another story, and how to get there from here is another, but let's first at least establish what you actually have!

To say that Randy sold you a single stage charger to replace the WFCO that would only do one stage is a serious accusation, so let's make sure of our facts. :(

I bought it about 7 month ago from best converters & he recommended this charger because of my my complaint that the wfco 55 amp never went into boost like was supposed to. & I had to run the generator for ever just to get thru the next day.

cdcorpe wrote:
It is not a typo, I doubled checked. Now I am confused, all the battery charts show 12.1 as 50% also my smart gauge showed 48% The 12.5 was a typo I ran the batteries down to to 12.1

Ok, so it says PMPC-75 on it? Never heard of that, but that doesn't mean a lot :(. Please clarify where you bought it and which one you thought you were getting. Be good if you could link to that model where you bought it.

Randy has a "car showroom" model that may or may not be the same as a regular PMBC car showroom charger. (maybe the model you got does not have stages, but is a straight power supply at 13.x?)

EDIT-Randy's showroom one has a single stage 13.6v it says but is called a PMBC-75. (the PowerMax site has its PMBCs with stages like a converter, with 14.8v as the boost.

One test you could do is with no batteries on the charger, turn on its 120v and measure the DC voltage at its output terminals. 13.6? or what? Then with a decent amount of amps charging say 25 or so, and connected up as usual, measure the voltage at the converter's DC terminals and at the battery posts to note any difference. (voltage drop/line loss)