Here's a vendor I've bought from.
This listing is new 440W panels, pallet at $0.50/W (not including shipping)
So I can see the appeal of your approach.
These 30 new 440W panels are a high efficiency solar panel. Please see pictures for reference. They come with a manufacturer 25 year warranty.
www.santansolar.com
I forget which is which, regarding N-type vs. P-type wafers, which are then doped P-type vs. N-type to make a PN junction. I thought both were subject to PID if biased the wrong way. Change in materials (epoxy, glass) was suppose to have mitigated the issue.
Panels used to be negative grounded, for positive 12V or whatever systems.
SunPower made panels of the opposite from usual doping, and were supposed to be lower degradation. But they suffered severe PID. SMA offered a paper and I think a box to bias the panels differently at night, partially reversing the ion flow. SunPower got SMA to provide inverters which could be configured either positive or negative ground.
Now SunPower has panels they say are "PID free", meaning so low a PID effect as to be negligible.
For about a year I had AstroPower single crystal, Sharp polycrystaline, SunPower single crystal all strings in parallel and on transformerless inverter. Half the string was positive biased, half was negative. I later noted some Sharp were badly degraded, but don't know if it came from biasing.
I now have separate negative ground for AstroPower and Sharp, positive ground for SunPower. I've acquired some REC half-cut, low PID but I'll try to determine optimum bias for them.
