Growatt WIT 4-25K-XHU

Compatibility

Documented logger bridge; installed Edge integration untested

The WIT product page names ShineWiLAN-X2 and Modbus TCP. Growatt’s technical white paper supplies the USB-to-inverter bridge, LAN connection and FC03/FC04 requests. Its inverter-table requirement remains separate from the logger connection procedure.

WIT 4K, 5K, 6K, 8K, 10K, 12K, 15K, 17K, 20K and 25K-XHU at 380/400 V only. WIT-HU low-voltage battery and larger WIT-XHU families are separate. Check the installed nameplate, firmware, grid country, battery, meter, generator and monitoring accessory before selecting any integration design.

Models

Specifications

The manual names ten 380/400 V XHU ratings: 4, 5, 6, 8, 10, 12, 15, 17, 20 and 25 kW. Growatt splits their current electrical data between 4-15 kW and 17-25 kW May 2026 sheets. Both identify a 120-800 V lithium-ion battery range, up to 1000 V PV input, backup output and a generator/AC-coupling input.^1, 2, 3

Exact models

WIT 4K, 5K, 6K, 8K, 10K, 12K, 15K, 17K, 20K and 25K-XHU^1, 2, 3

Grid and backup voltage

Three phase; nominal 220/380, 230/400 or 240/415 V, depending on country setting^2, 3

PV input

1000 V maximum DC; 150-850 V MPPT working range; trackers and string counts vary by rating^2, 3

High-voltage battery

Lithium-ion, 120-800 V; 55 A maximum charge/discharge current; BMS communication via RS-485/CAN^2, 3

Monitoring and EMS

RS485-IN/OUT pins 1/4/5: Meter2/ShineBus/ShineMaster; pins 7/8: EMS/VPP¹

Export-limitation meter

METER pins 1/5: RS485-2B/2A for Meter1 on a single inverter¹

Grid-response contacts

DI pins 1-6: DRM1/5 to DRM4/8, REF, COM¹

4-15 kW enclosure

445 × 630 × 234 mm; 43 kg; IP66²

17-25 kW enclosure

465 × 644 × 241 mm; 45 kg; IP66³

Interface

Documented measurements and integration boundaries for WIT 4-25K-XHU.

• RS485-IN/OUT separates pins 1/4/5 for Meter2/ShineBus/ShineMaster from pins 7/8 for EMS/VPP. The logger path below avoids repurposing these occupied field buses.
• The METER connector's pins 1/5 are RS485-2B/2A for Meter1, the single-inverter export-limitation meter. The BMS1 RS-485/CAN contacts are for the battery. Do not treat either as the inverter telemetry port.
• The DI connector assigns DRM1/5 through DRM4/8, REF and COM to DRMS/RCR/digital input. Those dry contacts have a different commissioning and grid-rule role from software dispatch.
• Growatt VPP V2.03 lists WIT29.9–50K-XHU as DTC5601, rather than this 4–25 kW family. Request the WIT4–25K-XHU point table for register meanings; the logger bridge and bounded transport request are already documented.
• The GEN port can be configured for a generator or AC coupling. Battery, backup and generator energy flows need separate measurement references. Inverter output alone is not site import, export or a settlement meter.

Setup

1. Record the exact XHU installation

   Capture the full rating, firmware, country grid code, battery and BMS revision, generator or AC-coupled source, backup loads, Meter1/Meter2 and logger. Confirm whether this is XHU high-voltage equipment rather than the similarly named HU low-voltage family.

2. Trace each communications role

   Match the installed COM1/COM2 wiring to section 6.6 and record BMS1, RS485-IN/OUT, METER, DI and parallel connectors separately. Preserve the commissioned meter and protection wiring.

3. Connect to the ShineWiLAN-X2 logger

   Keep the client and logger on the same local network. Use the logger’s actual DHCP address or a reservation, with TCP port 502. Growatt’s example uses inverter unit ID 1; substitute the installed address. The white paper’s connection screen calls for a response timeout above 5 seconds, a connection timeout above 3000 ms and a poll delay above 50 ms. Start with 6 seconds, 5 seconds and 1 second respectively.

4. Check the read transport

   The white paper demonstrates FC03 holding reads starting at wire address 0. A bounded one-register variant is 03 00 00 00 01. With example transaction ID 0010 and unit ID 1, the complete Modbus TCP request is 00 10 00 00 00 06 01 03 00 00 00 01. TCP uses the MBAP header, not an RTU CRC. A normal FC03 response carries two data bytes; retain their raw UINT16 value as a link check, without labelling it power or state. An exception response or no response is not a zero measurement.

5. Verify independent measurement

   Use the XHU inverter table for point names, types, units and scaling, then compare simultaneous readings with local monitoring. Keep inverter output, battery flow, generator/backup paths and the separately located grid meter distinct. Record sample time and discard stale readings.

6. Keep dispatch under approved control

   The connection check uses read functions only. Retain commissioned generator, backup, export and battery controls; add dispatch only with the system designer’s authority, limits and communication-loss behaviour.

Common questions

Does the WIT 4-25K-XHU support Modbus TCP?

Yes. Growatt names the standard ShineWiLAN-X2 logger on this product page, and its technical white paper documents a local Modbus TCP bridge on port 502. Use the connection and bounded read check above. Assign telemetry meanings from the WIT4–25K-XHU point table rather than another WIT rating.^1, 4, 6

Can the EMS/VPP pins be used for VPP dispatch?

Pins 7/8 are assigned to EMS/VPP. Keep their existing controller role and authority intact. The public VPP V2.03 annex names the larger WIT29.9–50K-XHU family; use the 4–25 kW family’s own point table and commissioned controls design for dispatch.^1, 5, 7

Is the METER port an inverter data feed?

No such feed is established. The manual describes METER pins 1/5 as the Meter1 RS-485 connection for single-inverter export limitation. A meter's readings and protocol do not define inverter telemetry or a second master.¹

Can the generator input and backup output be measured as grid import and export?

No. GEN may be commissioned for a generator or AC coupling, and backup is a separate supply path. Grid-point import/export needs a correctly located, commissioned meter with its CT direction and sign verified against the site's single-line diagram.¹