MPPSolar - PCM5048 - Time to come out.. :-(

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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby Tracker » Wed Sep 04, 2013 7:28 am

..
WELL, for whatever reason, they made contact late yesterday .. ;)

Thanks, ERIC..

One wonders if the issue is that the system seems to have been designed for the complex, and they overlooked the obvious. the. Simple ... ( especially me... :lol: )

At issue, is using the device in the simple situation of a voltage limited charger.. Frustratingly simple.. :!:
But -- one, they may not have tested for.


AGM... When originally asked how you defeat ABSORB, they said. " set the absorb time to ZERO " .. obvious...
Pretty darn obvious, but, something you would hope, they had tested... possibly not..! ... :oops:


how many other multi-thousand dollar battery banks have been destroyed, because they failed to LISTEN... :cry:
and owners have been made to feel like incompetent fools, with no redress, other than chalk it up to experience, and buy the fully tested stuff...

Have THEY given ANY thought to LITHIUM..

I had assumed the pure voltage mode would have covered that need..

we all await the words from the RnD "Department ".. :?

HINT.. to RnD... float is float... there must be a reliable mode of voltage control..
Perhaps, introduce a new MODE. ------ LITHIUM. ------ Where the absolute maximum voltage is set, along with current limiting...
..
.
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby Cherokee Solar » Wed Sep 04, 2013 9:29 am

Tracker wrote:Today, I saw it producing 62V... How can that be..?


Hi Tracker,

That's pretty high for AGM or Gel batteries. It is much cooler here but I wouldn't want to see the batteries here higher than about 29v (or 58v in your case). It was a good observation and (hopefully) you noticed it in time before any significant damage occurred.

Just out of interest, how are the batteries handling this high voltage? Have you noticed any bulging in the cases? Are they getting hot? Can you hear or smell them off gassing?

Using 3 x Plasmatronic regulators here makes me the black sheep of this here MPPT herd, so I applaud the fact that you are giving another product a go and seeing how it operates in the real world! ;) The Plasmatronics regulators are really rugged and reliable bits of kit and at least they can be locally repaired.

If we don't test this stuff, no one will ever know how it operates and problems like this one will never get aired.

Chris
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby Quokka2 » Wed Sep 04, 2013 10:47 am

Tracker wrote:At issue, is using the device in the simple situation of a voltage limited charger.. Frustratingly simple..

So what is the frustratingly simple solution to this problem? Perhaps you could post their reply here for the benefit of others, as MPPSolar have declined to.
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby Tracker » Wed Sep 04, 2013 6:32 pm

Cherokee Solar wrote:..... how are the batteries handling this high voltage? Have you noticed any bulging in the cases? Are they getting hot? Can you hear or smell them off gassing?...

I have been super cautious of NOT causing GASSING.. In ALL fairness - Over-Cautious to the reverse extent..
ie.. I suspect that I have consistently undercharged.
With daily cycles, it is all a cyclic system, NOT a Stand-By system.. BUT, that is all irrelevant to the problem..
Cherokee Solar wrote:so I applaud the fact that you are giving another product a go and seeing how it operates in the real world!

I won't mince words - I REALLY like the device, and were it not for this issue, I would buy another one tomorrow..
I don't accept that just because it's "Made In China" (or Taiwan) , that it is automatically BAD..
WHAT IS NOT "made in China"..

Anyway - I will persevere and either stand as a warning for others, or be the means of identifying a BUG, that no one else has found..

MPPSolar admit that they do not know of anyone who set the ABSORB time to ZERO.. Well I did..!
I assume that this means that the CC will charge through FLOAT to the ABSORB voltage, and then, with TIME set to ZERO, it "Should" then drop to FLOAT..
That's acceptable, as the lowest ABSORB voltage is 54.9, and again, my FLOAT is 54.6..
..
.
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby offgridQLD » Wed Sep 04, 2013 6:45 pm

I don't think we are saying its rubbish because its made in china. I think you just got your moneys worth and nothing more.

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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby davidg » Wed Sep 04, 2013 7:08 pm

offgridQLD wrote:I don't think we are saying its rubbish because its made in china.

I think I'll stick to products that work and work really well thanks, without having to worry about any potential heartache. That way when or if someone buys something from me or I decide to use it myself, I will know for sure IT WORKS and will do exactly what it's supposed to do, for lots of years and years and years. 8-)
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby feral » Wed Sep 04, 2013 7:40 pm

Hi yawl,

I find it odd that no one else has asked the op about the batteries specs/make, or the programmed voltages, or even read the destruction manual.

I also find it odd that no one picked up the snafu with the float/absorb voltage.

Cheers Feral.
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby karlajensen » Wed Sep 04, 2013 7:41 pm

Tracker wrote:
karlajensen wrote:......came to me for some bits, was set up to use 2 x 250W panels in each string to charge 48V battery banks.....those in the know .......this is a catastrophe! and does NOT work.

ummm.. WHY. :?:

please explain... :!:

Strings....Voltage.......Current..... Banks ........ :?: ;)
..
.


because a 60 cell 250W panel runs at 25V in the summer sun and 2x that = 50V, all good for a 48V battery bank.......WRONG!

need 72 cell panels for 24 and 2x for 48V

only way 60 cell panels work (as 99% of MPP controllers will run higher voltage panels than batteries but NOT the other way around)
is when you can run 3 in a string to give 75V and they will MPP track and convert to the ~60V required to charge a 48V bank.
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby Tracker » Wed Sep 04, 2013 7:49 pm

karlajensen wrote:....because a 60 cell 250W panel runs at 25V in the summer sun and 2x that = 50V,....


That explains it completely.. 'tis hard keeping up with all the new technology..

Just have to wonder WHY they chose 250W and 24, Vs 36V.. I suppose HIGH power and LOW voltage is good, given the new system voltage limits..
..
.
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby karlajensen » Wed Sep 04, 2013 7:55 pm

simpler than that, used to be impossible to make 6" cells (couldnt grow the ingots big enogh)
and hence 5" cells were common and less waste in terms of bits cut off the sides of an ingot than a 6" cell.

as time has moved on 6" cells are more cost effective and hence now the dominant size as in a handlable format ie sub 20kgs 60 cells is as big as possible.

lower voltage in that format, 60 cells vs say 96 cells for some 5" cells and you're at 37Voc vs 60Voc hence more wattage out of each string within the 600V limit of as5033 (not to mention most inverters with a 550V limit)
8E + 8W + 8Nth Garage CMS2000-1 with ~4500W in 3 strings of 8.
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12x ZNShine + 12x 180W Solarfuns both NW + ZNShine 12x190 facing SE.
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