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Colin

Multi strings

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3 minutes ago, Chris Hobson said:

No offence meant and no offence  taken

Thank you

Oooh I like East-West arrays. Just completed a 25kWp East-West array.

Wow, how do they perform ?

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5 minutes ago, ibiza said:

Wow, how do they perform ?

25kWp was producing 23kW at 3:30 in the afternoon. I think they are a marvelous idea. Tilt at about 15°. You lose about 10-15% production versus a North-facing array but there is less seasonal variation and far more importantly a longer solar day. If you grid-tie and are largely are going to use energy for self consumption. This would be the way I would go.

I'll take photos later this week.

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49 minutes ago, Chris Hobson said:

25kWp was producing 23kW at 3:30 in the afternoon. I think they are a marvelous idea. Tilt at about 15°. You lose about 10-15% production versus a North-facing array but there is less seasonal variation and far more importantly a longer solar day. If you grid-tie and are largely are going to use energy for self consumption. This would be the way I would go.

I'll take photos later this week.

Do you have a knowledge of how much longer it is or what are the "working hours " these days?

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9 hours ago, ibiza said:

Do you have a knowledge of how much longer it is or what are the "working hours " these days?

I have a North-west pointing array and it makes good power until well past 5pm, I easily get an extra hour out of it. See attached a comparison between my North-facing string vs the NW-facing string. I have these on separate MPPTs, but I believe it does illustrate the concept.

 

Selection_118.png

Selection_119.png

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My array is split in half (due to space constraints), nine panels face NW and nine panels NE. I also have a longer solar day and I was a little worried at first, but I am very happy with the result

 

image.png.b5ec0badb6401bcc741bda87d81abbe8.png

 

Not the best solar day but the graph gives a good indication of production.

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My system does however have high voltage, high quality diodes to prevent one half of the array feeding back to the other panels, just thought I would mention that.

An extra layer of protection.

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Update of my multi strings

7:20

12+3 panels   98.2V         578w

12     panels    89.1v         262w

12:00

12+3 panels   84v           1986w

12    panels    74v            2108w

16;00

12+3 panels    79v          1007w

12    panels     85v            636w

 

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