How much sun intensity need for mono panel need to produce electricity ?

Re: How much sun intensity need for mono panel need to produce electricity ?

Where in India (?) are you... Need to find a website/information that is local to your installation. Weather can have a serious effect on solar production.

This website seems to have pretty good coverage for India (I am not sure how accurate it is--It may forecast less power than other programs):

http://solarelectricityhandbook.com/solar-irradiance.html

PV Watts has a few Indian cities... And has detailed output that gives hour by hour output (based on ~20 year average weather). Perhaps that will give you the information you are looking for.

Mono and Poly Crystalline panels perform about the same. The big difference is Mono crystalline panels are somewhat more efficient at converting solar energy into electricity, so your array size (square meters) may be 10% or so smaller foot print.

For most people, Mono panels cost more per Watt vs poly crystalline. If there is no reason to pack as much power in as small as place as possible (i.e., a small roof area/portable installation, etc.). -- Just get the best $$$/Watt price (installed) that you can.

How much light--Basically, a solar panel needs direct light (weak sunrise/sun set) to bring the output voltage up to ~Vmp (voltage maximum power)--From that point on, the output current is proportional to the amount of sun hitting the panel.

Panels in deep shade and/or partial shading (overhead wires, vent pipes, landscaping/trees, etc.) will produce much less power (even a little shading can knock 25% or more power from a solar array (even upwards of 100% loss of power depending on array configuration and amount and location of shading).

You can make your own solar intensity meter--Just take a silicon solar panel and short its output through a precision resistor. Use a sensitive volt meter to measure the voltage drop across the resistor. The output current of a shorted solar panel is proportional to the amount of sunlight (and is usually linear in the 5-10% range). Also, the output current is relatively insensitive to panel temperature (panel voltage is ~5-10x more sensitive to cell temperature vs current output).

-Bill