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

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

Postby Cherokee Solar » Thu Sep 05, 2013 8:26 am

karlajensen wrote:only way 60 cell panels work (as 99% of MPP controllers will run higher voltage panels than batteries but NOT the other way around)


That confirms something I've suspected about MPPT controllers in that they can step down voltage, but not step it up. Makes sense as the circuits would be easier and cheaper to produce.

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

Postby Tracker » Thu Sep 05, 2013 10:11 am

feral wrote:......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.....


my only comment is that the ISSUE is the voltages seen.. high voltages ..


Now, I have to assume that there is something wrong, if you can get consistent voltages over float.

and, if the battery itself can affect this voltage, then that too is bloody strange.

after all, we don't hear folk declaring that their Outback charges to a higher voltage IF the battery is AGM, OR GELL, OR red or blue..
A voltage regulator does just that..... regulate ... and you program for the battery specs..

the issue with Absorb voltage and time is hardly that relevant .... 0.3v difference..
1.3v over IS relevant .. 63v is seriously relevant ... So if it is completely normal for all charge regulators to make up their own minds as to what voltage they will charge to then so be it.. :cry:
Could the load cause the problems .. :idea: :?:
..
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Last edited by Tracker on Thu Sep 05, 2013 10:25 am, edited 1 time in total.
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby Tracker » Thu Sep 05, 2013 10:21 am

Cherokee Solar wrote:
karlajensen wrote:only way 60 cell panels work (as 99% of MPP controllers will run higher voltage panels than batteries but NOT the other way around)


That confirms something I've suspected about MPPT controllers in that they can step down voltage, but not step it up. Makes sense as the circuits would be easier and cheaper to produce.


it would not be all that hard to make a stepup MPPT, but then you would lose efficiency, and surely that defeats the whole idea... also, given that you can always add panels ... eg 3 rather than 2, it makes no sense worrying about it.. you just choose the panels to best suit the CC..
..
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby Gordon-Loomberah » Thu Sep 05, 2013 10:42 am

Tracker wrote:Could the load cause the problems .. :idea: :?:


Sudden removal of a large load can cause a brief increase in voltage as the CC adjusts the current back to meet the new load demand. It shouldn't be more than a volt or so (depends somewhat on current and battery capacity, and SOC), and it should be brief, a few seconds at most.
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby AWDFun » Thu Sep 05, 2013 10:52 am

Ive heard extreme gassing at 63V for hours with my unit.
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby davidg » Thu Sep 05, 2013 9:05 pm

AWDFun wrote:Ive heard extreme gassing at 63V for hours with my unit.

You have a problem, it's cooking them nicely are they AGM's or Gell's ? If they are it's destroying them quickly :cry:
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby offgridQLD » Fri Sep 06, 2013 8:33 am

Perhaps it's a hybrid charger. Recharge your battery's and produce hydrogen in large quantity's at the same time. At least you don't have to worry about setting a EQ charge as its doing a nice strong one every day for you. Perhaps the engineers got the cook books and there technical books mixed up (simmer and reduce) :lol:

Seriously I would get that charger off the battery's. I wouldn't feel comfortable leaving the house for more than 1hr at a time with that thing in charge of the bank.

I would play with it connected to a few old car battery's so you have nothing to risk. let it prove it self or get it sorted before risking it on your house bank.


If anyone wants a basic but reliable! plazmatronics pl40 charge controller. I have two doing nothing.I did give 1st dibs on one of them to some one on the forum cant remember who?. I will put one of them up in the for sale section of the forum.

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

Postby feral » Fri Sep 06, 2013 8:59 am

Now, I have to assume that there is something wrong, if you can get consistent voltages over float.


Wonder if the BTS is out of wack?

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

Postby AWDFun » Fri Sep 06, 2013 11:18 am

davidg wrote:
AWDFun wrote:Ive heard extreme gassing at 63V for hours with my unit.

You have a problem, it's cooking them nicely are they AGM's or Gell's ? If they are it's destroying them quickly :cry:


Yeah figured. They are AGM. Not much more I can do about it really.
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Re: MPPSolar - PCM5048 - Time to come out.. :-(

Postby Gordon-Loomberah » Fri Sep 06, 2013 11:43 am

There are things you can do... Does it have a separate battery voltage sensing connection? If you add a boltage in series in there, say a 3V battery, then it will charge the main battery at a lower, by 3V, voltage. If it is only Vfloat that is too high and you have it adjusted as low as it can go already, does it have an output that is triggered by going to Float? Use that to bring in the battery sense extra battery voltage, so it is only seeing that extra high voltage when in Float.
You will destroy those batteries quite quickly of they see 63V for too much time. If one battery goes pop! or catches alight, is the resulting mess likely to damage any of your other equipment?
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