Very convenient topic. What would you think about a VOC of 57,5V for an MPPT inverter that can not tolerate more than 60VDC? Theoretically at 0*C the VOC could reach the 60V.I would not try it unless you know for sure that the power station has really good protection for PV input, the VOC will go even higher in cold condition.
I have a power station with 12-30V PV max input PV voltage.
I also have a used panel with Voc 32.6 and Vmp 25.9. Is it going to be okay for me to plug the panel into the power station directly with it being so slightly over?
Thanks
Well with everyone's input, I think I might just go get a charge controller then. Seems like its a disaster waiting to happen
Of course, it's the Bullbat Pioneer 500. The spec says 12-30V input and 160W maxmay i ask, what model name power station?
with the goal zero lithium 3000 i uninstalled their charge controller (only like 20V max input) and replaced it with a victron mppt with muuch higher max input voltage rating (100V) and it worked great. felt so good to safely connect two 300W panels in series to charge that power station.
very important to research the power station’s battery cell chemistry max and min voltage and program the solar charge controller according to that
That's too cool. ThanksYou can use the online Victron MPPT calculator to know for sure if the PV voltage input is OK or not.
I've had a similar question. I have a PV Input of 142.35v. I'm looking at a SCC with a 150v Max input. It rarely gets below 30°F where I am , but is that too close? Would it be "less stressful" on a 175 or 200v max input controller?
Have ( 3 ) 355w panels wired in series. Each panel 47.45 Voc.The answer on this forum would be no.
I would say don't try it unless you are watching and also ready for equipment damage.
With that said, I've done some testing in the past few days
1. At least the SCC I have, it will give a fault code when the voltage is above the max instead of just burning down like I was thinking from reading some comments here.
2. The spike in voltage happens even at 41F, so 30F is not a way to guarantee the spike won't happen.
Why do you have to push it to that high of a voltage though?
I've had a similar question. I have a PV Input of 142.35v. I'm looking at a SCC with a 150v Max input. It rarely gets below 30°F where I am , but is that too close? Would it be "less stressful" on a 175 or 200v max input controller?
Have ( 3 ) 355w panels wired in series. Each panel 47.45 Voc.
24V System.
I haveThe answer on this forum would be no.
I would say don't try it unless you are watching and also ready for equipment damage.
With that said, I've done some testing in the past few days
1. At least the SCC I have, it will give a fault code when the voltage is above the max instead of just burning down like I was thinking from reading some comments here.
2. The spike in voltage happens even at 41F, so 30F is not a way to guarantee the spike won't happen.
Why do you have to push it to that high of a voltage though?
My panels were $100 ea. ( Insurance resale ) and tested. They are already installed on my small shed. I don't have a 4th or room for one on the roof.I wouldn't do it with a 150V SCC. I would use 200V SCC, or four PV panels 2s2p on 150V.
My math, using assumed cold temperature and temperature coefficient, is +16% on Voc, which would be 165V. That's 10% over, not "a little".
Unless you sharpen your pencil using accurate numbers for your case, like it never gets cold, and you find it remains no higher than 150V.
Except, if you get something like Midnight Classic, their "Hyper-VOC" tolerates a certain amount of over-voltage, just doesn't operate until Voc drops below the limit.
I have
My panels were $100 ea. ( Insurance resale ) and tested. They are already installed on my small shed. I don't have a 4th or room for one on the roof.