question

yj-lin avatar image
yj-lin asked

Why is the MPPT 100/30 Pmax higher than the panel rating?

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Hello Guys,

Can anyone help me to clarify why my Pmax is sometimes over 800w ? I have only two 350w panels installed totally 700w. Images attached.

many thanks,

YJ

Solar Panelsmart mppt
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1 Answer
Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @YJ Lin,

See the fine print below the numbers.

The panel specification is for STC or Standard Test Conditions, with a power input of 1000W/sqM at 25 degrees celsius.

In the real world the suns power can be much higher than 1000W/sqM - though usually not for very long, you will typically see these 'peak' power events occur when the sun comes out from behind a cloud.

For this moment, the panels may be cooler than 25 degrees celsius (increasing panel voltage), and sun power might be at 1200W/sqM, providing the extra 20% power you are seeing on the MPPT.

2 comments
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nancieuhh avatar image nancieuhh commented ·

Hey, @Guy Stewart (Victron Community Manager),

Thank you for sharing your valuable knowledge with us. It would be helpful to clarify the question asked.

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yj-lin avatar image yj-lin commented ·

Many thanks for your clear explanation.

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