Answers from
the install bench.

SDM120CTM for single-phase sites; SDM630MCT for three-phase. One useful tip for single-phase installs: consider using the SDM630MCT in 1P2W mode anyway — it has an on-meter address button, which makes recovery much easier if the meter address gets bumped during commissioning.

Enabling Grid Tie Meter2 sends an RS485 broadcast that forces every connected meter to address 002. If meter1 and meter2 are both wired at that moment, both end up at 002 and the inverter reports a W04 address collision.

The silent trap: sometimes meter1’s address gets bumped without any warning at all — everything looks fine, but import/export and time-of-use readings are quietly wrong, and nobody notices until bills don’t add up days later. This is the single most damaging commissioning trap in the Deye ecosystem, so follow the connection sequence below.

For dual-meter installs: connect ONLY meter2 first — leave meter1 unwired. Enable “Ex_Meter For CT” and “Grid Tie Meter2”, then verify meter2 now sits at address 002. Only then connect meter1, which keeps its default address 001. Result: zero collision risk.

The arrow points TOWARD the grid (away from the load). Installed backwards, import and export readings are inverted — export reads as import and vice versa. It’s an invisible defect: the system runs, but the customer notices wrong bills weeks later. Make the two-minute visual check part of every install.

Dual-band routers — Telstra-supplied units especially — often default to an encryption mode the datalogger can’t handle. The fix: log into the router, make sure the 2.4 GHz network is enabled, set encryption to WPA2-PSK, and turn Band Steering OFF. Without this, expect 30+ minutes of troubleshooting on a typical Telstra site.

No — 2.4 GHz only. Band Steering must also be off, otherwise the router keeps pushing the datalogger toward 5 GHz and the connection drops. Note that many newer routers don’t have the 2.4 GHz band enabled by default.

The datalogger broadcasts its own Wi-Fi hotspot: the SSID is the device serial number, and the password is the characters after “PWD” on the device label. Connect a laptop to that hotspot and open 10.10.100.254 in a browser for the admin page. First-time setup asks you to set a username and password (minimum 6 characters). This lets you do manual Wi-Fi configuration without the Deye app — handy on sites with poor mobile signal.

APAC — set at account registration (on the Login or Me page). Device data does NOT transfer between data centres: if an account is accidentally registered in EMEA or AMEA, the historical data is stranded there and devices may need full re-registration.

Why it matters: it’s a one-way decision. Get it wrong and the customer loses their history.

Business. Tap the avatar in the upper-left, choose “Create a Business”, fill in the details and confirm — each account can hold up to 5 businesses. Personal accounts suit end customers with a single plant; Business accounts give installers multi-plant views and Plant Authorization controls. Starting Personal and trying to add installer capability later is much harder than starting Business from day one.

Flashing means it’s still trying to reach the router, or it has reached the router but not Deye Cloud yet. Work through this checklist in order: (1) router actually has internet — test on a phone; (2) datalogger is on 2.4 GHz, not 5 GHz; (3) encryption is WPA2-PSK, not WPA3; (4) Band Steering is off; (5) no corporate firewall blocking deye.com endpoints. If it still won’t go solid within 5 minutes of a clean config, power-cycle the inverter once.

Why it matters: the NET light is the installer’s primary feedback. Knowing flashing-vs-solid saves a lot of false alarm calls.