I'm currently using a 550W solar panel (49V VOC) to charge my Anker C1000 LiFePo4 power station, and it's working flawlessly. I also have a couple of older SunPower 215W panels (47V VOC) that I want to add for extra wattage, especially on cloudy days, but they are positive ground panels. Since my system isn't grid-tied and only has positive and negative leads from the panels, I'm wondering if mixing these panels could cause any problems. I've tried connecting one of the SunPower panels, and it works fine, but I'm concerned about potential polarization effects on the 550W panel or any safety risks. I've heard mixed opinions about performance drops, but my main worry is about damaging my larger setup or any safety issues. Any thoughts?
1 Answer
Just to clarify, there’s no such thing as positive or negative ground panels—it's really about the grounding of your system. Since your panels have similar VOCs, you should be good! You’re probably just seeing a slight drop in efficiency since they aren't perfectly matched, but with the extra wattage from the SunPower panels, you should be in a net positive situation overall. You can safely keep them connected without damages or hazards!
Thanks for the info! I was worried about the performance loss, but it's good to hear it works out overall. Seems like I can confidently use my SunPower panels!