Solar Street Light Sizing

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Solar Street Light Sizing

Postby Solutionsmind » Fri Jul 06, 2018 6:08 am

For a 30W LED Solar Street light….How many 150W PV Panels will power the lamp throughout the night ( 6 pm to 7 am )?
What should be the size of AGM Battery to be used?
How should the PV panel and batteries be connected-series or parallel?
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Re: Solar Street Light Sizing

Postby Gordon-Loomberah » Fri Jul 06, 2018 8:58 am

Too many unknowns to give a proper answer...

What voltage (Vmp) are the panels?
How much sunlight would they get- any shading?
What are the hours of solar radiation per day throughout the year
How many days of cloudy weather do you get in winter or in the wet season if you have one?
What are the specifications and characteristics of your AGM batteries?
What is the LED light voltage?

The panels should not be connected to the batteries directly, you need a charge controller.
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Re: Solar Street Light Sizing

Postby davidg » Sun Jul 08, 2018 8:02 am

Solutionsmind wrote:How many 150W PV Panels will power the lamp throughout the night ( 6 pm to 7 am )?

I'm not sure you will find 150w panels cost effective, it would be better to see what panels get you best bang for buck where you are. In Australia that tends to be in excess of 250W panels (modules) now.
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Re: Solar Street Light Sizing

Postby Solutionsmind » Tue Jul 10, 2018 10:06 pm

1. Optimum Operating Voltage of the Panel( Vamp) : 17.5V
2. How much Sunlight daily : 8 Hours ( 9 am to 5pm)
The Average Peak Sun-Hours is 3 hours( 12pm to 3pm)
3. Any shading? : No
4. Hours of Solar Radiation per day throughout the year: 4000Wh/day
5. How many days of cloudy weather: We have two seasons in Nigeria, namely dry and rainy season.During the rainy season,we could have no sunshine for maximum of 7 Days.
During the rainy season,there is still sunlight.
6. Specification of AGM Battery : 150AH ( QUANTA Brand)
7. LED Light Voltage : 30W LED Street light lamp.
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Re: Solar Street Light Sizing

Postby davidg » Tue Jul 10, 2018 10:49 pm

Mmmmm.......... Solar panel too small use 270w to 300 watt house style panels, the voltage is higher, they produce more power. The voltage mismatch is handled by the mppt charger controller.

Don't waste your with those low voltage panels, use a true mppt charge controller of proper size

Don't waste your time using 9 to 5 only use peak sun hours. Then use the no sun days calc from there.

If you expect an AGM battery to last do not use a battery rather use cells and base calls on no more than 50% DOD for the battery pack. Otherwise you will be replacing it/them very likely annually.
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An OTT Genset for a house.
PVOutput Stats

Sparkys light up your life :)
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