Is the Sunsynk SYNK-SG04LP3 SYNK-10K-SG04LP3 compatible with the Sunsynk CHNT DDSU666 (1ph 80A)?

Yes — listed by the manufacturer.

The manufacturer's published pairing data lists these together.

Manufacturer's compatibility listListed together in the manufacturer's published pairing data. A cited document reference is being added as datasheets are processed.

Pairing details

Both products

Design a system with this pair