duerrd561
New Member
Hi everyone!
I have an ~11 year old grid-tied SunPower solar array comprised of forty SPR-245NE-WHT-D 245W modules (so 9.8kW total) and a SunPower-branded SMA SunnyBoy 8000-US string inverter. The inverter is in the process of dying, and I am looking for a suitable replacement that will work with my modules without causing them harm.
According to the SunPower data sheet I found for this specific module, it claims that it is compatible with transformer-less inverters, and that it does not require positive grounding. And according to the inverter documentation, it can be grounded positively or negatively depending on a fuse and jumper placement, and it defaults to a positive grounding configuration out-of-the-box. When I opened up the inverter, it is indeed in the (default) positive grounding configuration.
So it seems I am basically using positive grounding on modules that do not require it. Is it possible these panels were wired/grounded up on the roof in such a way that my installation requires positive grounding even though the modules do not? Or is it literally just a matter of within the inverter itself, which pole is connected to ground? I'm trying to understand what it would entail to move to a transformer-less inverter which does not provide positive grounding without compromising the function of my array.
Thanks!
I have an ~11 year old grid-tied SunPower solar array comprised of forty SPR-245NE-WHT-D 245W modules (so 9.8kW total) and a SunPower-branded SMA SunnyBoy 8000-US string inverter. The inverter is in the process of dying, and I am looking for a suitable replacement that will work with my modules without causing them harm.
According to the SunPower data sheet I found for this specific module, it claims that it is compatible with transformer-less inverters, and that it does not require positive grounding. And according to the inverter documentation, it can be grounded positively or negatively depending on a fuse and jumper placement, and it defaults to a positive grounding configuration out-of-the-box. When I opened up the inverter, it is indeed in the (default) positive grounding configuration.
So it seems I am basically using positive grounding on modules that do not require it. Is it possible these panels were wired/grounded up on the roof in such a way that my installation requires positive grounding even though the modules do not? Or is it literally just a matter of within the inverter itself, which pole is connected to ground? I'm trying to understand what it would entail to move to a transformer-less inverter which does not provide positive grounding without compromising the function of my array.
Thanks!
