GoodWe SDT G3 8–15 kW

Compatibility

Direct Edge integration not yet verified

The exact-family V2.1 datasheet specifies SunSpec-compliant Modbus RTU. Its public model definitions provide a best-effort read procedure, with model discovery determining the point layout. The installed RS485 bus and fitted communications accessory determine the connection.

Use the exact -30 or -EU30 nameplate and the V2.4 Model d terminal drawing. On an installer-approved inverter-network bus, use its commissioned serial settings and address with one client. Compare the first power reading with the local interface; preserve meter, logger and export-control roles.

Models

Specifications

The March 2026 sheet identifies the covered five codes in the 4–30 kW two-MPPT range. Each has 1100 V maximum DC input, 140–1000 V MPPT operating range, IP66 enclosure and nominal 220/380, 230/400 or 240/415 V three-phase output, subject to local grid standards.²

Covered models

GW8000-SDT-30; GW10K-SDT-30; GW10K-SDT-EU30; GW12K-SDT-30; GW15K-SDT-30^2, 3

Nominal AC power

8, 10, 10, 12 or 15 kW respectively²

PV tracking

Two MPPTs, one string per MPPT for the covered models²

Inverter-network RS485

Manual Model d: B1/A1 on terminals 1/2 and 3/4, for a logger or inverter network³

Meter RS485

Manual Model d: B2/A2 on terminals 5/6, for the export-control meter³

Published protocols

SunSpec-compliant Modbus RTU and Modbus TCP; discover the returned models on the commissioned endpoint²

Enclosure and cooling

IP66; natural convection in this 8–15 kW subset²

Interface

Documented measurements and integration boundaries for SDT G3 8–15 kW.

• The V2.4 manual groups all five covered models as Model d. Its RS485 B1/A1 terminals 1–4 connect inverter networks or a GoodWe data logger. Its separate meter B2/A2 terminals 5–6 support the meter and CT export-control arrangement. Trace the existing plant before connecting another client.
• The manual describes GoodWe collector options: EzLogger Pro or SEC1000 up to 20 inverters per COM port, EzLogger 3000C or SEC3000 up to 25. These are GoodWe bus design limits, not proven Edge polling capacity. The manual reserves SEC3000C for GW50K-SDT-C30, outside this group.
• The V2.1 datasheet specifies SunSpec-compliant Modbus RTU for this 8–15 kW subset, alongside Modbus TCP and optional communications hardware. Start with the inverter RS485 discovery procedure below. Check the fitted stick’s documentation separately when choosing a TCP connection.
• For export limiting or 24-hour consumption monitoring, the manual requires a correctly placed grid-point CT and meter. Inverter AC power alone cannot measure net import or export; verify CT direction, phase mapping and sign at the connection point.
• RCR inputs may serve grid dispatch requirements in Germany and remote shutdown is integrated, but the manual says those functions are disabled by default and require commissioning. A physical input is not an authorisation for third-party software dispatch.

Setup

1. Match the exact nameplate

   Record the whole model suffix, country approval, inverter firmware and grid profile. The EU30 and ordinary 10 kW -30 have different published maximum AC output.

2. Trace the GoodWe communication topology

   Identify the fitted logger, SEC controller or communications stick. For the five covered Model d units, terminals 1/2 and 3/4 are B1/A1 for inverter networking or a logger; terminals 5/6 are B2/A2 for the meter. Use the inverter-network pair for discovery, with the commissioned bus owner’s agreement.

3. Document the grid-point measurement

   Record the meter, CT ratio, CT arrow, three phase mapping and physical point of connection. Compare GoodWe's load and export readings against an independent meter before treating them as site flexibility data.

4. Discover the SunSpec models

   On an installer-approved inverter RS-485 bus, use the configured server address and serial settings with one client. FC03 reads two registers at wire addresses 0, 40000 or 50000 to find the SunSpec signature 53 75 6E 53. Read each model header (ID and length), advance by length + 2, and stop at ID 65535. Record the returned model IDs; do not assume model 103 or fixed positions.

5. Read AC power

   If discovery returns model 103, let H be its header wire address. FC03 at H + 14, quantity 2, reads signed int16 W and W_SF. Power = W × 10^W_SF; 0x8000 means unavailable. Synthetic H = 40070 gives PDU 03 9C 94 00 02; bytes 30 39 FF FF mean 12345 × 10^-1 = 1234.5 W. Compare with GoodWe’s interface. Model 113 or another returned model needs its own definition.

6. Keep controls separate

   Document who owns export limitation, RCR, remote shutdown and any VPP dispatch. Do not write setpoints or alter grid settings on the basis of a protocol label or this selection guide.

Common questions

Does the Wi-Fi/LAN stick give Edge a direct Modbus TCP connection?

The datasheet lists Modbus TCP and optional communication hardware, but the retained documents do not prove the service, access rights or point map of a particular stick and firmware. Verify those details with GoodWe and the site owner before a read.^2, 3

Can inverter output represent site export or VPP capacity?

No. The manual's export-limit topology uses a meter and correctly oriented CTs near the grid connection point. Establish net site power, loads, controllability and dispatch permission separately.³

Is the GW10K-SDT-EU30 identical to GW10K-SDT-30?

Both are rated 10 kW nominal, but the V2.1 sheet lists 10 kW maximum AC active power for the EU30 and 11 kW for the -30. Use the exact suffix for sizing and local approval.²

How can I make a first read without a GoodWe register map?

Use the V2.1 datasheet and V2.4 manual as the starting revisions. Discover SunSpec on the inverter-network bus using its configured address and serial settings. If model 103 is returned, the setup procedure reads W and W_SF and compares the result with GoodWe’s interface. Use the definition of the model actually returned; model 113 has a different layout.^{2, 3, 4, 5}