Frank in Thailand
making mistakes so you don't have to...
Hi there!
One picture tells more then a hundred words
Thailand has the sun directly above our heads so the overhang of the roof casts a shadow.
Sunrises on the right, and sundown on the left.
Morning and later afternoon no shade.
I have 2 x 12 panels.
5 can be covered half in the sade.
7 would be sunny.
Will a shaded solar panel that provide the same voltage but half the capacity...
Say 150 watt in stead of 300w, will they limit the others to also provide maximal 150w?
So the choice is 12* 150w
Or loose 3 panels, and get 9* 300?
5 x 150 + 7 x 300 = 2850
Or 12 x 150? = 1800
Or 9 x 300? = 2700 (not using the shaded space)
Shading starts around 10.30 and stops around 14.30
This 40% shading is the maximum it will get
What is the best way to install?
To add complexity, they can't be parallel. Inverter starts at 250v, max 450v.
6 x 36v = 216..
Minimal 7 panels in a string.
Mppt max capacity 3500
Thailand heat, angle, some dust, there will never be full performance of the 300w.
Say 10-25% less due to environment.
14 panels would be too much for one MPPT.
So giving one 14 and the other 10 isn't an option.
Well .. is, but will result in loss as the MPPT can't convert all the provided electricity.
Ideal it can produce 2 x 3500 watt
I like to get as close as possible to this maximal performance as possible.
What to do with the shade???
Not use the space (and not use 3 panels)
Or...
??
Your input is much appreciated ?
One picture tells more then a hundred words
Thailand has the sun directly above our heads so the overhang of the roof casts a shadow.
Sunrises on the right, and sundown on the left.
Morning and later afternoon no shade.
I have 2 x 12 panels.
5 can be covered half in the sade.
7 would be sunny.
Will a shaded solar panel that provide the same voltage but half the capacity...
Say 150 watt in stead of 300w, will they limit the others to also provide maximal 150w?
So the choice is 12* 150w
Or loose 3 panels, and get 9* 300?
5 x 150 + 7 x 300 = 2850
Or 12 x 150? = 1800
Or 9 x 300? = 2700 (not using the shaded space)
Shading starts around 10.30 and stops around 14.30
This 40% shading is the maximum it will get
What is the best way to install?
To add complexity, they can't be parallel. Inverter starts at 250v, max 450v.
6 x 36v = 216..
Minimal 7 panels in a string.
Mppt max capacity 3500
Thailand heat, angle, some dust, there will never be full performance of the 300w.
Say 10-25% less due to environment.
14 panels would be too much for one MPPT.
So giving one 14 and the other 10 isn't an option.
Well .. is, but will result in loss as the MPPT can't convert all the provided electricity.
Ideal it can produce 2 x 3500 watt
I like to get as close as possible to this maximal performance as possible.
What to do with the shade???
Not use the space (and not use 3 panels)
Or...
??
Your input is much appreciated ?