Prefersdirt
Solar Enthusiast
- Joined
- Sep 28, 2019
- Messages
- 377
Please double check my math. I am at the point of getting the mounting supplies to put the panels on the roof. Want to maximize the number of panels. I have 10 panels – figured out I can put more up, but that is all I have. Information as of now is:
Each panel is:
250W,
37.6V max
8.27A
I have a Midnight Solar breaker box that will hold 6 DC breakers, so there is flexibility there.
I am currently using a GroWatt 3k at 24V for the inverter and PV controller. My intent is to use part of the next “stimulus” check to buy a tier 1 inverter and SCC.
The GroWatt has a PV max voltage of 145V with a range of 30~115V. Typical Amperage is 80A. I can’t find max Amps in the manual. On page 39 the max charging current is 140Amp (ouch!) If you know better info, please share.
What I currently am looking at is 3S3P. Each set of 3 would give me 750W, 38V, and 8.3 amps. Putting them into parallel gives me 2250W, 114V, and 25A.
I can’t go 3S4P as that overages my voltage at 152V.
I don’t think I can go 2S5P as that overages my voltage as well.
Is the 3S3P the max I can get with the equipment I have now? I think I have the ability to add another 4 panels (max of 14) to the roof space, but that requires another order. One step at at time. Get as many as possible operating.
Thank you
Each panel is:
250W,
37.6V max
8.27A
I have a Midnight Solar breaker box that will hold 6 DC breakers, so there is flexibility there.
I am currently using a GroWatt 3k at 24V for the inverter and PV controller. My intent is to use part of the next “stimulus” check to buy a tier 1 inverter and SCC.
The GroWatt has a PV max voltage of 145V with a range of 30~115V. Typical Amperage is 80A. I can’t find max Amps in the manual. On page 39 the max charging current is 140Amp (ouch!) If you know better info, please share.
What I currently am looking at is 3S3P. Each set of 3 would give me 750W, 38V, and 8.3 amps. Putting them into parallel gives me 2250W, 114V, and 25A.
I can’t go 3S4P as that overages my voltage at 152V.
I don’t think I can go 2S5P as that overages my voltage as well.
Is the 3S3P the max I can get with the equipment I have now? I think I have the ability to add another 4 panels (max of 14) to the roof space, but that requires another order. One step at at time. Get as many as possible operating.
Thank you
Last edited: