About parallel wiring panel

[Ginozor]

Hello , I'm Giorgio from Italy, I have a question about the connection of several solar panels in parallel,
suppose I have a panel at 45 degrees 18v that generates 2A and a panel at 0 degrees that generates 3A connected in parallel with diode schottky,
my mppt will receive 2A + 3 A 18v?

[inetdog]

Happy to answer your question once you are able to finish asking it.
In general you can put panels in parallel when connected to an MPPT type input as long as the voltages of the two panels are within 5%. In some cases (three or more panels) you may need to put fuses in each panel connection.

[Ginozor]

Happy to answer your question once you are able to finish asking it.
In general you can put panels in parallel when connected to an MPPT type input as long as the voltages of the two panels are within 5%. In some cases (three or more panels) you may need to put fuses in each panel connection.

Hello , I'm Giorgio from Italy, I have a question about the connection of several solar panels in parallel,
suppose I have a panel at 45 degrees 18v that generates 2A and a panel at 0 degrees that generates 3A connected in parallel with diode schottky,
my mppt will receive 2A + 3 A 18v?

sorry but the forum dont take degrees simbol

[bcroe]

If they are identical panels, you do not need the diode. Bruce Roe

[Ginozor]

If they are identical panels, you do not need the diode. Bruce Roe

No the panels have the same vmp and the same voc with different power , but my question is , will the current add up even if different ?

[Mike90250]

Panels in parallel = Amps add together you will be sending 5A @ 18V

Problem you have 18V panels. Wired in parallel, you still only have 18V and a MPPT controller will need about 25 or 30V to be able to properly charge a 12V battery

Please check the operating manual for what voltage is effective with your controller. I would suggest a regular PWM controller with 18V panels is good for 12V batteries

[Ginozor]

Panels in parallel = Amps add together you will be sending 5A @ 18V

Problem you have 18V panels. Wired in parallel, you still only have 18V and a MPPT controller will need about 25 or 30V to be able to properly charge a 12V battery

Please check the operating manual for what voltage is effective with your controller. I would suggest a regular PWM controller with 18V panels is good for 12V batteries

Hi mike ,

i use this mppt (https://www.aliexpress.com/item/E-Bi...39344c4dINsa2J) for charging a lithium pack 13s 8p for my solar bike

But all panels aren't in the same degrees i only ask if the amps add togheter with diode schottky that prevent backflow

[inetdog]

Hi mike ,

i use this mppt (https://www.aliexpress.com/item/E-Bi...39344c4dINsa2J) for charging a lithium pack 13s 8p for my solar bike

But all panels aren't in the same degrees i only ask if the amps add togheter with diode schottky that prevent backflow

The different amount of sunlight hitting the panel will have the greatest effect on the Imp value, and very little effect on the Vmp. So your two panels will still have very close to the same voltage (close enough that either an MPPT or a PWM controller will work just fine with the parallel combination.
As Mike said, you do not need the diodes.
You add the amps at any particular moment together, but because of the angle difference the output of the two panels will not peak at the same time, so you will never actually see 5A at any single time. The peak of the sum of the currents will not be with full output from each panel, more likely at a time when it is equally distant between the first panel peak and the second panel peak. When you plot the current output the combined current will not be the sum of the individual peaks, but the output curve will be much wider, leading to a higher total power (area under the curve.)

[Ginozor]

The different amount of sunlight hitting the panel will have the greatest effect on the Imp value, and very little effect on the Vmp. So your two panels will still have very close to the same voltage (close enough that either an MPPT or a PWM controller will work just fine with the parallel combination.
As Mike said, you do not need the diodes.
You add the amps at any particular moment together, but because of the angle difference the output of the two panels will not peak at the same time, so you will never actually see 5A at any single time. The peak of the sum of the currents will not be with full output from each panel, more likely at a time when it is equally distant between the first panel peak and the second panel peak. When you plot the current output the combined current will not be the sum of the individual peaks, but the output curve will be much wider, leading to a higher total power (area under the curve.)

Thx thx thx


but I'm not clear about the curve area, I hypothesized the voltages measured with the meter

[Mike90250]

Panels in light, pretty much produce voltage according to their temperature. As the brightness goes up, the current (amps) increases. If a panel was overloaded past it's Vmp point, it's voltage would rise back to the Vmp. Generally, diodes are NOT used with parallel panels under any conditions.

Just say No to Diodes