Hi
How good are these, for grid tie applications are they worth even buying?
like the bp mst-50mv

Do you have a specific panel in mind ?

I figured you were looking at the BP Asi panels on eBay

BP no longer makes these panels, or any Asi panel, the only manufacture that still does is unisolar

Asi , was touted as the coming of cheap PV panels , but many manufactures found it wasn't cheaper to produce , there are long term degradation issues and they need 2X the space of Si for the same wattage.

I like a deal just like anyone else , but when you can get brand new Si panels for 3.60 watt with a proven track record , is it really a bargain to get Asi panels that are no longer produced , what do you do when you get panel failures , you should check with BP Solar about warranties

My vote, maybe for a single panel, it might be OK, for any type of real array, no way, of course just IMHO

Henry,
you are free to use my data
32 Solarex Millenium MSX43watt, 81v each (weird voltage).
For the first week or so i got over 1500 watts during burn in.
Now the BEST i can do in clear sky with a 23degree tilt to the panels (roof is a 4in 12 or a 5 in 12, eyeballed it at 23.5degrees with protractor) at about 38degree latitude, sloar noon etc. is 1054 watts.
to me they are down over 20% over a 6 year period.
they are 26inches by 48 inches and at BEST 33watts per panel.
I am getting ready to install some Sharp 185's when i get an inverter and misc items tha tare about 20% larger
BUT
33watts vs 185 watts is about 4x the power
why did i buy amorphous? i didnt know any better at the time