Is the Sunsynk SYNK-SG04LP1-SM2 SYNK-5K-SG04LP1-SM2 compatible with the Chint DDSU666 CHNT DDSU666 (1ph 80A)?

Yes — listed by the manufacturer.

The manufacturer's published pairing data lists these together.

Minute Solar records Sunsynk SYNK-SG04LP1-SM2 SYNK-5K-SG04LP1-SM2 with Chint DDSU666 CHNT DDSU666 (1ph 80A) as compatible (A — Automatic). Read by Minute Solar from recorded specifications, compatibility groups or a stored record that has not yet been reviewed; no manufacturer approval is recorded.

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

Sunsynk SYNK-SG04LP1-SM2 SYNK-5K-SG04LP1-SM2 — inverter
Chint DDSU666 CHNT DDSU666 (1ph 80A) — meter

Design a system with this pair

Automatic Expert Manufacturer Approved Manufacturer Guaranteed

Compatibility levels: what we have read, and what the manufacturer has promised

Minute Solar's reading

Automatic. Read by Minute Solar from recorded specifications, compatibility groups or a stored record that has not yet been reviewed; no manufacturer approval is recorded.
Expert. Reviewed and accepted by a named expert within their approved area, or supported by Minute Solar testing; it is not manufacturer approval or a guarantee.

The manufacturer's word

Manufacturer Approved. The manufacturer has confirmed this exact pairing in writing (grey tick).
Manufacturer Guaranteed. A contractual manufacturer guarantee is recorded for this pairing (blue tick).

A is the default: our reading of a stored record or a manufacturer compatibility group before anyone has reviewed it, not the manufacturer's word. No decision recorded means there is neither, and it is not incompatible. Evidence applies to the stated pairing and conditions.