Hi,
I'm new here, but not new to off grid PV.
I'm upgrading my existing PV system.
Currently I have 4 * 135w (12v. nominal) panels, (2 * 24v 270w series strings) that are running through 2 * 15 amp circuits
from rooftop to a cheapo 24v/30 amp charge controller to a 24v battery bank.
Very simple, all good.
I want to add 3 * 250w (24v nominal) panels and replace the cheapo controller. with a 45 amp MPPT controller.
I want to utilize the existing roof to controller wiring.
To stay under 45 amp controller capacity and the 15 amp roof circuits, I need to bump up to 48v strings.
The new system would be:
4 * 135w = 540w in one 48v string on one of the 15amp circuits
3 * 750w = 750w in one 48v string on the other 15amp circuit
The unusual part of this, and my question is...
Is there any reason not to parallel 2 of the 250w 24v panels, and then series them to the third 250w panel?
Thanks, Eric
I'm new here, but not new to off grid PV.
I'm upgrading my existing PV system.
Currently I have 4 * 135w (12v. nominal) panels, (2 * 24v 270w series strings) that are running through 2 * 15 amp circuits
from rooftop to a cheapo 24v/30 amp charge controller to a 24v battery bank.
Very simple, all good.
I want to add 3 * 250w (24v nominal) panels and replace the cheapo controller. with a 45 amp MPPT controller.
I want to utilize the existing roof to controller wiring.
To stay under 45 amp controller capacity and the 15 amp roof circuits, I need to bump up to 48v strings.
The new system would be:
4 * 135w = 540w in one 48v string on one of the 15amp circuits
3 * 750w = 750w in one 48v string on the other 15amp circuit
The unusual part of this, and my question is...
Is there any reason not to parallel 2 of the 250w 24v panels, and then series them to the third 250w panel?
Thanks, Eric
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