Howdy folks,
I'm a newbie here trying to get a little better understanding of how solar energy works in this particular given situation.
I have my theories based on what I remember from what I read, but no experience working on this scale of solar energy. My theories are open for correction. It's the reason I am here.
My model is an OFF GRID home with the roof line running mostly north and south. There are 1000 watts of panels on the roof. The East side of the roof has 500 watts worth, the west side of the roof has a set of 500 watts of panels. As the sun rises, the MORNING sun strikes only the east panels. The MIDDAY sun lights both panels, and the EVENING sun lights only the west panels.
Part I
What are the most efficient ways to connect these panels together?
A: Series
B: Parallel
Part II: Separately
Here are my theories:
A) Connected in series, the dark panels will prevent the lighted panels from working, so I would see the power grow from 0 to 1000 watts starting when the sun first lights both panels. It will drop from 1000 to 0 watts as the sun drops off the east panel.
B) Connected in parallel, I would expect to see the power rise from 0 to 500 watts as the morning sun rises on the east panel. Then, it would rise from 500 to 1000 watts as it adds light to the west panel. Then, it would drop to 500 watts as the east panel becomes shaded, and finally to 0 when the sun sets below the west panel.
Part II: Separately
In this scenario, the east and west panels are separate systems. They each have a solar charge controller, but they share a common load.
How do I tie them both to the same load?
My theories:
A) Parallel: Tie the outputs of the two charge controllers together to feed one 12 volt source.
I believe I would end up with the same results as connecting the panels in series. The charge controller with the most output would supersede the other controller. The controller with the lower output would read the higher voltage of the other controller and think the battery was fully charged and turn itself off.
B) Series: Tie outputs of the two charge controllers together in series to raise the voltage. Feed the combined voltage output of the two into a third controller that charges the battery or feeds the load.
For best results, the third controller would need to be an MPPT type and the two separate controllers would have to be able to work together. For this scenario, I am assuming they are and they work together.
My theory is that as the east system will generate 12.6 to 14.6 volts with the current rising until it peaks at midday. Then, the west system will kick in an additional 12.6-14.6 volts to raise the voltage to as much as 24 to 30 volts peak. The MPPT will drop the voltage and charge the batteries or the load accordingly.
Since my Renogy PWM charge controller varies battery charging voltage to match the condition of the battery, I would guess my above theory is total trash as it would never know what the state of the battery is.
My guess is that the best scenario is connecting the east and west panel systems in parallel and feeding one charge controller.
I'm a newbie here trying to get a little better understanding of how solar energy works in this particular given situation.
I have my theories based on what I remember from what I read, but no experience working on this scale of solar energy. My theories are open for correction. It's the reason I am here.
My model is an OFF GRID home with the roof line running mostly north and south. There are 1000 watts of panels on the roof. The East side of the roof has 500 watts worth, the west side of the roof has a set of 500 watts of panels. As the sun rises, the MORNING sun strikes only the east panels. The MIDDAY sun lights both panels, and the EVENING sun lights only the west panels.
Part I
What are the most efficient ways to connect these panels together?
A: Series
B: Parallel
Part II: Separately
Here are my theories:
A) Connected in series, the dark panels will prevent the lighted panels from working, so I would see the power grow from 0 to 1000 watts starting when the sun first lights both panels. It will drop from 1000 to 0 watts as the sun drops off the east panel.
B) Connected in parallel, I would expect to see the power rise from 0 to 500 watts as the morning sun rises on the east panel. Then, it would rise from 500 to 1000 watts as it adds light to the west panel. Then, it would drop to 500 watts as the east panel becomes shaded, and finally to 0 when the sun sets below the west panel.
Part II: Separately
In this scenario, the east and west panels are separate systems. They each have a solar charge controller, but they share a common load.
How do I tie them both to the same load?
My theories:
A) Parallel: Tie the outputs of the two charge controllers together to feed one 12 volt source.
I believe I would end up with the same results as connecting the panels in series. The charge controller with the most output would supersede the other controller. The controller with the lower output would read the higher voltage of the other controller and think the battery was fully charged and turn itself off.
B) Series: Tie outputs of the two charge controllers together in series to raise the voltage. Feed the combined voltage output of the two into a third controller that charges the battery or feeds the load.
For best results, the third controller would need to be an MPPT type and the two separate controllers would have to be able to work together. For this scenario, I am assuming they are and they work together.
My theory is that as the east system will generate 12.6 to 14.6 volts with the current rising until it peaks at midday. Then, the west system will kick in an additional 12.6-14.6 volts to raise the voltage to as much as 24 to 30 volts peak. The MPPT will drop the voltage and charge the batteries or the load accordingly.
Since my Renogy PWM charge controller varies battery charging voltage to match the condition of the battery, I would guess my above theory is total trash as it would never know what the state of the battery is.
My guess is that the best scenario is connecting the east and west panel systems in parallel and feeding one charge controller.
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