Hello everybody ¡¡¡ My name is Daniel and I live in Spain, sorry if my english is not perfect , i will try my best do.
I own a PIP5048GK, and already working with it for a few months, (August 2018).
I had some issues with it that I would like to share here with you , just in case someone else is also.
I also have some questions for the Pros.
first off all i use the unit without batteries, only solar panales and AC, I opted for this unit because Batteries are so expensive still, but maybe in the future it will be an option.
Also my solar panels are canadian solar i will leave here the specs in case we need them
Electrical Data | Noct* for CS6U 330P
Nominal Max. Power (Pmax) 239 W
Opt. Operating Voltage (Vmp) 33.9 V
Opt. Operating Current (Imp) 7.05 A
Open Circuit Voltage (Voc) 41.9 V
Short Circuit Current (Isc) 7.66 A
Canadian solar STC CS6U 330P
Nominal Max. Power (Pmax) 330 W
Opt. Operating Voltage (Vmp) 37.2 V
Opt. Operating Current (Imp) 8.88 A
Open Circuit Voltage (Voc) 45.6 V
Short Circuit Current (Isc) 9.45 A
When i bought it, all was working good, for a week or so, and suddenly one day the inverted turned off, and all electricity went off too in the house, i went to the unit and it was showing error 02 in the screen, which according to the manual is overheat. ummm strange , i touched the unit and it was not hot. turned it off manually from AC, restarted the inverted and it all worked fine again.
next day ..... again same thing happened, turned it on again and went to the computer to check watchpower software, and ..... surprise...... constant error 02 in the event error log.
I contacted MPP solar, and they sent me, after a few weeks of discussions and strange tests, new temperature sensors, but after changing them all was still the same.
I kept complaining to mpp solar and now they sent me a new motherboard, but i did not change it still, because after all this time, 6 months of back and forth emails, i had time to watch and test my faulty unit, and i found why it was really turning off. and the answer is.... i did not have enough Volts from my solar panels.
I started with 5 panels, the unit always went off early in the morning, between 9/10 AM, i realized that at that time the Voltage was too close to those 120V that the unit needs to work , and with the error 02 always behind in the shows, the unit was turning off and showing only then the error 02.
Now, i just added a new panel , so i have 6 and is been working perfect for 2 weeks now, now the voltage never gets below 140V, still error 02 is there in the software do, but unit works just fine. Honestly i don't know if the unit will do the same if i had 5 panels and no error 02 problem, i really think unit will probable work fine with 5 panels if it didn't have the error 02, maybe one day i will test it after i change the MB, if the error 02 disappears after i change it.
Anyway thats been my experience with it, just in case someone has only 5 panels with similars specs as mine and the inverter suddenly stops, well just try with 6.
Now some questions i have.
i was planing to set my system with 12 panels of those above, but i have 2 roofs with almost same orientation , but one is lower and because of that it gets the sun half an hour later in the morning and almost 1 our extra in the evening.
My original idea it was to set 6 units in one roof and 6 in the other and work with 2 strings, but after contacting mppsolar they told me that i can't , because the max AMP of this inverter is 18A, and unfortunately those solar panels get peaks of 9,5A. i have spend a few hours checking the amps in the App and almost never goes that hight, but it happens. so i'm afraid to do that setting, and if i do 1 string i will not enjoy all my solar time, and also i can only set 10 panels.
So questions are.
can i set more than 18A , can that destroy my inverter, or the unit will deal with it, and stop/suspend if it happens ?
If the answer is not, can i add something to limit the Amps to those 18, so the inverter never gets more than 18A from the panels?
Someone commented in an earlier post of setting 3 strings with total of 24 panels, but he did not share the total Amps or configuration.
well thanks a lot in advance, bTW i tried to contact voltronic with this topic also, as they are the manufactures and no answer what so ever from those guys. how strange is that...