Hello, this is my first post here. I have been lurking on solar forums on and off for several years, and have helped install a few systems, so I am a little bit familiar with this..
My wife and I had been intending to do a grid tied system, but with the current state of the economy and the job market, we made the call to do it now, and lower our monthly expenses as soon as possible. I am putting a system together of used components, some of which I know are not the ideal choice but it's how I can afford to do it now.
What I have currently, are 24 sun power 305 panels.
I have access to a NOS, SunnyBoy 7000us transformer type inverter, that has positive ground capability to work with these panels. Going this route costs me about a quarter of what it would cost with new panels, which is nice as work has been sporadic for the past several months. My issue is, the SB 7000 only appears to have one MPPT input, that supports one string. I can do it, and wire the panels to be below the max voltage and amperage.... but the barn roof has two sections facing slightly differently. Ideally I would have two strings and two MPPT inputs. So, is there any newer inverter, that can be made configured to run a positive ground array of panels? Or, is there a way to add more MPPT inputs to the SB 7000?
I have found someone locally, that has supposedly found a way to use these same panels with a sunny boy island, and is grid tied somehow, but I have yet to connect with him.
I've read a ton, and come up with nothing positive, but I'll keep asking before giving up completely.
Thanks in advance, SD
My wife and I had been intending to do a grid tied system, but with the current state of the economy and the job market, we made the call to do it now, and lower our monthly expenses as soon as possible. I am putting a system together of used components, some of which I know are not the ideal choice but it's how I can afford to do it now.
What I have currently, are 24 sun power 305 panels.
I have access to a NOS, SunnyBoy 7000us transformer type inverter, that has positive ground capability to work with these panels. Going this route costs me about a quarter of what it would cost with new panels, which is nice as work has been sporadic for the past several months. My issue is, the SB 7000 only appears to have one MPPT input, that supports one string. I can do it, and wire the panels to be below the max voltage and amperage.... but the barn roof has two sections facing slightly differently. Ideally I would have two strings and two MPPT inputs. So, is there any newer inverter, that can be made configured to run a positive ground array of panels? Or, is there a way to add more MPPT inputs to the SB 7000?
I have found someone locally, that has supposedly found a way to use these same panels with a sunny boy island, and is grid tied somehow, but I have yet to connect with him.
I've read a ton, and come up with nothing positive, but I'll keep asking before giving up completely.
Thanks in advance, SD
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