Its interesting that you have had issues - I've fitted them to several boats where nothing else will fit and all make around their full output - but on 12v boats . There are 6 on a Woods that I fitted that run all the systems and 2 CR50 fridges in the UK - in full sun we see about 20 amps in to the 200ah Lithium battery .
Have you specifically fitted the 50w flexible panels? It would appear that the larger sizes perform well
My panels were bought directly from Renogy in the USA. Not through a dealer. How do you expect me to investigate the panels further? I have tested them thoroughly and they don't perform anywhere near what my glass panels are doing. They have never got anywhere near the rated output when my glass panels have exceeded the rated output by 15%. The four 50w panels have never exceeded 127w, ever. What user error do you think I could have?
In the interest of science, I just disconnected the panels. Checked the open circuit current. All circa 22v. I disconnect one pair of panels such that the cable volt drop is now only dealing with 100w of solar not 200w. The output for that 100w of solar in direct sun was 1.6A at 24v. Compared to 360w of framed solar panels with exactly the same orientation producing 12A@24v
Open circuit current 22V?
The controllers are Victron smart solar MPPTs about as good as it gets. Tell me if you know a better solar controller?
Yes as I said - I did 6 of the 50w on a Woods Banshee because the deck only allowed for the small size in odd places and 2 on a Colvic and another two on a third mono but I have no idea how they performed as the owner never unplugged from shore power in two years and then went off in a camper van !
Your MPPT will be charging at 28v so 1.6A at 28v is 45 watts - and if you have 8% drop for temperature on a 50w thats 46w max so they are doing exactly what they should aren't they? Now with the two in series they give 40v and the MPPT should make some of that back to charge at 28v but you're not doing too badly . Was the sun directly overhead or close enough rather than an angle.
1.6A was for a pair so 100w of solar not a single 50w panel
Short circuit voltage is zero. Depending on the kwolitee of your 'short' of course.
2 x 22v panels wired in series = 44v, easy for the Victron MPPT to step that down to whatever the 24v batteries need.
Well treated panels don’t have significant failure rates, those days are long gone and people need to stop perpetuating those myths.
As I and other have suggested, ask Renogy why you’re getting those numbers. You can do all the tests you like but if you have bad panels only Renogy can help you. Until and unless you do that please stop bad mouthing them in Internet forums with your anecdotal results.
You need to get a better understanding of the tech. That's not how it works
I contacted Renogy yesterday through there on line chat help. Typed in the details of the problem. Got a reply and then told it timed out due to inactivity! There's not mine. Couldn't be arsed to type it all in again but might give it another go today.
At 52°C there will be a significant degradation in the output of any solar panel, it's simple physics.
You're the one who's not making it work....
I agree, but that assumes there's genuine evidence of a bad product and some effort has been made to determine that the problem is systemic. Millions of these have been sold and most of us are having no problems at all which suggests strongly that the product itself is not flawed. That means either user error, faulty item, or fake item.
