EG4 18kPV Hybrid Inverter - Manufacturer Recondition @ Signature Solar

Hope this is the right place to ask about the re-manned 18K PV units Signature Solar is selling.

I am interested in buying but have a few questions. 

 They are listed as never sold or being out of the factory.   Were these test units, Blems,- are the Chipsets  or anything else internal parts wise different? like lower wattage IGBTs or MOSFETS or?

 The New 18K PV I bought in August 2024 from Signature is it identical? Thought I read there was a screen display change at some point  and see the newest 18K pv's are a version 2?

 I Would  be running it  in parallel with the existing 18K and/ or will just add another EG 4 Power Pro battery. Is there any real difference versus ordering a New 18K PV other than the shorter 5 year warranty.

 Thanks, just wanting as much info as possible about the re-manned 18K pv's.