I'm curious if it's a good idea to buy directly from the OEM that makes these solar units. They are much cheaper and offer 3 years full unit warranty and 5 years for compressor. The owner seems very active in responding to customers. Have a look at their site:
I don't want to rain on anyone's parade if they'v chosen EG4 units.

Deye Solar Air Conditioning in America | Solar Air Conditioner
Deye Inverter solar air conditioner Hybrid ACDC DC48V
deyesolar.com

Hybrid ACDC 12K/18K/24K | Solar Air Conditioner
Deye hybrid ACDC solar air conditioner, DC48V solar air conditioner. 100% saving energy, easy installation.
deyesolar.com
I don't want to rain on anyone's parade if they'v chosen EG4 units.