JBoffgrid2022
New Member
- Joined
- Oct 28, 2022
- Messages
- 153
Hello All,
I'm having some difficulties figuring out my solar panel layout and wiring configuration for my new system. First, how do I equally separate my 18 panels into 4 groups so I can tie them into two separate inverters? My first thought was to have one group of 4 and one group of 5 going into inverter #1, then one group of 4 and one group of 5 going into inverter #2. I'm shying away from this method because if my ambient temp drops to -20F (Which it does at my location) the temperature drop coefficient would push my voltage dangerously close to the 480volt max input on my inverter. If I have messed this calculation up, please let me know
My other option would be to make 4 groups of 4 (16 total) and leave the remaining 2 panels for backups. I guess my question is really revolving around how I should wire these panels while keeping in mind the optimum voltage of 320v and 17a per inverter. The inverter has two separate PV inputs but I'm not sure if each input is rated at 17 amps or 34 amps.
My other question is how I will safely bring four separate strings to my inverters. I would like to have a D/C isolator switch close to my panels on the roof, then bring my four PV strings to the inverter. That way I can keep the power off until I want to turn the system on and power the inverters. Any input is greatly appreciated!
-Jack B.
Maine
System Specs:
-18 x SunPower 450w Mono Solar Panels
-2 x EG4 (Parallel) 6000XP Split Phase Inverter All in one
-4 x EG4 LifePower4 Lithium Battery 48V / 100AH
signaturesolar.com
I'm having some difficulties figuring out my solar panel layout and wiring configuration for my new system. First, how do I equally separate my 18 panels into 4 groups so I can tie them into two separate inverters? My first thought was to have one group of 4 and one group of 5 going into inverter #1, then one group of 4 and one group of 5 going into inverter #2. I'm shying away from this method because if my ambient temp drops to -20F (Which it does at my location) the temperature drop coefficient would push my voltage dangerously close to the 480volt max input on my inverter. If I have messed this calculation up, please let me know
My other option would be to make 4 groups of 4 (16 total) and leave the remaining 2 panels for backups. I guess my question is really revolving around how I should wire these panels while keeping in mind the optimum voltage of 320v and 17a per inverter. The inverter has two separate PV inputs but I'm not sure if each input is rated at 17 amps or 34 amps.
My other question is how I will safely bring four separate strings to my inverters. I would like to have a D/C isolator switch close to my panels on the roof, then bring my four PV strings to the inverter. That way I can keep the power off until I want to turn the system on and power the inverters. Any input is greatly appreciated!
-Jack B.
Maine
System Specs:
-18 x SunPower 450w Mono Solar Panels
-2 x EG4 (Parallel) 6000XP Split Phase Inverter All in one
-4 x EG4 LifePower4 Lithium Battery 48V / 100AH
EG4 LifePower4 Lithium Battery | 48V 100AH | Server Rack Battery | UL1973, UL9540A
EG4 (48V/100AH) LifePower4 Battery EG4 Lithium battery 51.2V (48V) 5.12kWh with 100AH internal BMS. Made of UL Listed Battery Cells. Off Grid Solar Batteries - Off Grid System - Solar Batteries for Home - Lithium Solar Batteries - Deep Cycle Solar Batteries - Power Reserve - Solar Panels Plus...
signaturesolar.com
