Industry News

Secrets of Temperature Coefficient Pmax – Crystalline Technology Modules

By June 9, 2020 No Comments

There are many Good Quality Modules to chose from in the Australian Solar Space.

All claim High Efficiency, Warranties and Hype that they are the best by hiding behind a Bloomberg List as a Tier 1 Product that is only a reflection of the Manufacturers Cash Flow! If you are truly interested in Maximising the amount of Energy your Solar System can Generate then it is a prerequisite that you look at your Module’s Temperature Coefficient.

Unfortunately all Modules that are considered the best on our Continent and claim that they are of the highest Quality not only have similar Efficiencies but the same or similar Temperature Coefficient.

These include all Leading Brands such as Longi, LG, Jinko, Canadian, Winaico, and many more. They all have a Similar Temperature Coefficient Pmax of anywhere between -0.35 to -0.40%

So what does that mean?

The Temperature of your Solar Panel has a direct effect on its ability to Generate Electricity! Heat Limits Electronics ability to produce Power.

What is the Perfect Temperature?

All Modules perform at their best at 25 Degrees Celsius.

So what happens when Temperature increases beyond 25C or even reaches the Testing Nominal Temperature? – the Average of 40C. Is the Module the same Wattage as Advertised?

The answer is no!

The Higher the Temperature Coefficient Pmax the higher the loss of % Wattage per Celsius Degree above 25-C

Example:

350-watt Module, Temperature Coefficient Pmax of -0.35%, Todays Temperature 35 Degrees Celsius, Loss 12.25 Watts, True Wattage of Module at 35C = 337.75

That is a loss of 1.225 Watts for every Degree over 25-C.

That might not sound like much, however, if you start Multiplying by System Size, Years, Investment, Power Projection, etc then it will hinder your Bottom Line. And we have not even considered Radiant Heat from a Roof. These Temperatures can reach incredible Highs – much higher than Atmospheric Conditions.

Can your Module work when the Temperature has reached it’s tested Peak?

The losses are Astronomical!

Australia is a Large Continent with Temperature Extremes. Our Winter Average is 16C and our Summer 29C however, the highest Recorded Temperature reached 50.7C.

How many Perfect 25-C Solar Days will any Region of Australia Have?

Not sure, however, given the unpredictability of the Temperature you require to arm yourself with Modules that have a Low-Temperature Coefficient. It is one way to ensure that Module Efficiencies do not drop significantly and that your Investment can operate far better when the Environment is hot!

What Modules are available that have a Low-Temperature Coefficient Pmax?

There are not many Modules to choose from. As we reach the capacity of the 60 cell Crystalline Technology Module most Companies are turning to 72 Cells to create greater Wattage – even though the Module Efficiency seems to be the same and in most cases a little lower. However, these Modules are Large and cumbersome standing 2 Meters Tall. Great for Large Scale however not Practical for Small Projects.

The only Modules in Australia that seem to place importance on Low-Temperature Coefficient Pmax are Haitai Solar Tarzan Series and the Recom’s Jaguar Series.

Both Companies have reduced Temperature Coefficient Pmax to an amazing -0.244% through their Plate Interconnection Technology. In conclusion, what should you look for? High Module Efficiency is Great however only when the Temperature Coefficient Pmax is Low!

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