what inverters will work with an older positive ground panel array?

[badwithusernames]

Mike 90250 and Bcroe thank you. My gut said this was the case, but not having the firsthand experience I needed to ask. I'm goin to ask around to see if I an find one more panel, then I can run two strings of 7 on one inverter, and two strings of 6 on the other. More reading and research today..
thanks as always, this site has a ton of good info archived.
SD