Will ask that information from the installer
appreicate the help
Something limiting my PV production all of a sudden
- Thread starter doronazl
- Start date
appreicate the help
sunshine_eggo
Happy Breffast!
3kW array at 29° tilt. Almost perfect tilt.
Clearly not a perfect day with intermittent cirrus clouds. Ambient was 29°C.
About 12% below rated.
This is also at 6500 ft elevation. Thinner atmosphere means a little more sun than average.
Clearly not a perfect day with intermittent cirrus clouds. Ambient was 29°C.
About 12% below rated.
This is also at 6500 ft elevation. Thinner atmosphere means a little more sun than average.
TomC4306
Solar Obsessive
As measured from flat? Horizontal? Up and down is 90⁰
sunshine_eggo
Happy Breffast!
Flat and horizontal (they're the same). MOST references to tilt indicate from flat/horizontal including PVWatts.
At 34° latitude, 29° a few weeks before the equinox is pretty optimal.
TomC4306
Solar Obsessive
Equinox, yes. Solstice? No. They should be closer to vertical than closer to horizontal.
Edit.. and yes, I know they're the same.
Edit.. and yes, I know they're the same.
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sunshine_eggo
Happy Breffast!
Not sure what we're debating. OP was asking:
I presented him with day's worth of data from a nearly perfectly oriented array in a warm-ish climate only a few degrees cooler than his, but with delightfully minimal humidity.
I presented him with day's worth of data from a nearly perfectly oriented array in a warm-ish climate only a few degrees cooler than his, but with delightfully minimal humidity.
TomC4306
Solar Obsessive
The sun moves 46° between the winter solstice and the summer solstice in the sky. Therefore if you point your panels at the equinox position (the point where the day and the night are equal ) then the Sun moves 23° above that plane in the summer and 23° below that plane in the winter.
Sorry. Got sidetracked by your 29° reference. I'll send you a DM.
sunshine_eggo
Happy Breffast!
At equinox, sun is at 0 latitude.
I'm at 34° latitude. Array at 29° will be perfectly aligned when the sun is at 5° shortly before the autumnal equinox. I'm calling <5° off perpendicular as "nearly perfectly oriented."
The data provided was for about 16 days before the equinox. For calculation convenience, assuming 90 days from summer solstice to autumnal equinox and a linear progression of change in latitude from 23.5° to 0°, sun is at 5° latitude 19 days before the equinox.
Meets my "close enough" gauge quite nicely.
TomC4306
Solar Obsessive
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ZippyZappy
New Member
I have seen on some days that my solar production ramps up in the morning and then stops at around 2.8kW where it stays for a few hours before it goes down during evening.
I have a 5kW Deye, 5kW Volta battery and 6 x 545W = 3270W solar panels. I have seen the panels produce near that maximum during cooler lightly cloudy days where the clouds scatter the sunlight.
Is there any reason why this might be happening? My settings seem to allow the higher wattage, but on warm sunny days it seems to be limited. See below graph as example (Does this look like clipping?):
I have a 5kW Deye, 5kW Volta battery and 6 x 545W = 3270W solar panels. I have seen the panels produce near that maximum during cooler lightly cloudy days where the clouds scatter the sunlight.
Is there any reason why this might be happening? My settings seem to allow the higher wattage, but on warm sunny days it seems to be limited. See below graph as example (Does this look like clipping?):
houseofancients
Solar Wizard
can you compare that to the SOC of your battery ?
if grid export is disabled, and the battery is full, the pv will only produce what it needs to fulfill the loads
if grid export is disabled, and the battery is full, the pv will only produce what it needs to fulfill the loads
ZippyZappy
New Member
Here is the same graph with the SOC added. The battery is far from full during that time.
sunshine_eggo
Happy Breffast!
wait... 2800/3270 = 86% rated.
Sounds good to me.
While you may have more sun, that additional sun causes CELL heating, which degrades performance. Your cells could easily be pushing 50°C or higher. The performance numbers are for CELL temps of 25°C.
Check the NOCT and NMOT rating for your panels and compare.
Additionally, what is the PV input current of the DEYE, and what is your array current?
Flagish
https://www.wunderground.com/wundermap leads to https://www.wunderground.com/dashboard/pws/KAZFLAGS192
Random pick weather station with Solar Radiation (watts/m²) near bottom of page. Not all stations have Solar Radiation (watts/m²). Can look back to any day/wk/mth/yr. In future, 10 days. Shading and large bodies of water nearby make a difference. Consult Google Earth for optimum and not necessarily closest station location.
