@paullb Where did you get this info? Core Power has been in business for some years. Mark Shifter was one of the original principals, also served in this capacity with Perpetual Technologies.This when BPT still in business. Perp Tech went out of business, involved in serious shenanigans, seems Core Power sold out to Walter.
I understand the technology is pretty much same, not sure they're using same transformers as BPT 3.5 Signatures use Plitron transformers, unit weight 80lbs. Equi=Core 1800 weighs 54lbs. Points to substantial differences in transformers.