Electronics > Power/Renewable Energy/EV's

New Solar Panel Test -

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Someone:

--- Quote from: Dunk_c on October 25, 2016, 10:15:17 am ---Reality check - Anyone ever seen a 60w panel in a 550x440 frame?  Even without any testing this seems to be small and more like what I see for 40w panels. Also, some other panels in this wattage I have seen use a 36 string of 2/3 cut 125x125 cells (as far as I  ould measure from web pictures).

I have asked the seller if the replacement will meet the label performance. Waiting in reply.

--- End quote ---
This is the easy answer to your question! Other typical panels have less than 150W/m2, so their claim of 250W/m2 is very unlikely and only possible with bleeding edge single junction cells under ideal conditions. Its like battery capacities from grey market sellers, always suspicious.

Dunk_c:
Seller gave the usual story about panels never meeting quoted specs but I accepted offer of second free panel.  I'll just bolt the two together.  Not worth the hassle of return and finding another. Cost will be less than $1/W.  I don't have any placement constraints.  There were more than sixty endorsments for the item,  99% positive - I wonder what they actually got!

I will report back perfromance of second panel.

Seekonk:
Most don't really know what their panels are doing.  Many solar systems have excess potential and it is difficult to determine when some start to go bad.  I have an Arduino based solar system and dump excess power to heat water.   I have a routine in TOOLS that I can call to shut everything off for a moment and operate the PWM heaters to determine power point and power of array.  Had enough panels go bad to know you can't just set and forget.

Dunk_c:
As expected the replacement panel performed similarly. 

Dunk_c:
I tried to determine a rough MPP, this time tracking MPP with a variable dummy load

2:30 pm, clear sky, hot panel, perpendicular to the sun
W/m^2 = 1070 using uncalibrated solar irradiance meter
60w electronic CC dummy load

See chart, MPP = 32w, half the advertised rating (under my conditions admittedly)

I expect the second unit will behave identically.

So the two connected in parallel should yield 60w.

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