which solar module is more efficient in hot weather, module with monocrystalline cells or module with polycrystalline cells.

Hi,
I think mono is better than poly! Email: pvpowerstores@hotmail.com

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Because the power loss=(NOCT-20)*Temperature Coefficient of Pmax, the actual efficiency is determined by two factors. The lower the temperature rise in hot weather and lower temperature coefficient of Pmax are better and no direct relevant with mono or poly.

Calculation of the Minimum PV Voltage.
This happens at max temperature
using Vmax. Incorporate Cell Temperature of PV specification

Vadjmin = ( (TLocalMax + TCelAdj – TSTC) X CoeffVolTemp) + Vmax
Maximum number of modules in string
Rated System Voltage / Vadjmin
Wattage of max individual strings
No of Modules X Module Wattage
Voltage of max individual string
Vadjmin X No of string modules

It does not matter what is the best the mono or the poly it is related to the specification of the cell itself.
The lower the temperature of the environment and the panel the higher the power output.
NOCT (Normal Operating Cell Temperature) is 45 degree Celcius plus you add the environment temperature to the formula.
I hope this will clear out your concern.
attiliodalvit@gmail.com

woops sorry guys im way off...lol

In hot temperatures of tropical regions, we've observed the incremental benefits of MONO due to higher efficiency are negated by higher price vs. POLY. However if space is not a constraint we've observed aSi thinfilms doing very well due to their extremely low negative temp coefficient of power as well as ability to accommodate higher range of lights. This results in almost 17-20% higher generation of power over a period with availability even during cloudy/rainy days.
We undertake projects of both kinds of Off-Grids and On-Grids with both PV and ThinFilms and have seen their performance in operation.
Chetan Vyas
chetan@acvasolar.com