best low light performance

It is different here in the early morning, when the air is wetter than in the evening. We don't get the sun till after sunrise due to mountains to the East and same thing due to mountains to the West for sunset.

So "low light" times are extended perhaps here compared with where PT is on the prairies.

pianotuna wrote:
Hi,

Just time after sunrise when you get 0.1 of an amp.

OK. The sun must work different here. It is below the horizon now and I am showing .85 amps. Maybe its different in the AM.

Interesting article from John Wiles (PV Guru) on output versus irradiance.

PV Article

Discussion on the NAWS forum regarding high versus low voltage panels in low light:

NAWS Forum Discussion

Bruce

Hi BFL13,

Because with the mono--the volts are lower but the raw amps coming into the controller are higher. Which means the lower voltage allows the controller to run just a smidgen more efficiently.

BFL13 wrote:
Sounds like you have your answer! (Assuming you have proper wire)

I will not ask how come MPPT, which magically makes amps out of volts, does better with fewer volts! That way lies madness. :(

Hi,

Just time after sunrise when you get 0.1 of an amp.

pianotuna wrote:
Hi harold,

Did you not read Salvo's post about the Unisolar panels? Or perhaps you did not understand it?

Sure did , understood it too. I was no aware they are out of business.
Probably because they were putting out to much power under low light conditions they were burning out controllers.
I will monitor and report tomorrow just when my panels start producing power if its acceptable to do so in April instead of June.
Do you need the specific time and amps?

Still waiting on your answers????????????

Sounds like you have your answer! (Assuming you have proper wire)

I will not ask how come MPPT, which magically makes amps out of volts, does better with fewer volts! That way lies madness. :(

Hi Bfl13,

The mono would have the edge on the MPPT conversion due to lower voltage. Transmission losses the Poly has the edge due to higher voltage.

Ok so Mono one a bit better in lower light, but which would have that MPPT making more amps in regular light? Did you ask them that?

You don't want to give up more amps most of the time just for a bit better amps sometimes.

Hi,

They replied quite quickly:

The Mono is the more efficient panel in lower light.

I don’t have a chart for the Polly’s but as a rule of the thumb mono is slightly more efficient in lower light conditions.

Hope this helps! Jon