Growatt WIT 4-25K-XHU

Compatibility

Growatt port roles documented; direct read and control unverified

The exact-family manual assigns RS485-IN/OUT pins 1/4/5 to Meter2/ShineBus/ShineMaster and pins 7/8 to EMS/VPP. It assigns a separate METER port to Meter1 and DI to DRMS. The product page says Modbus TCP is available but supplies no XHU endpoint, firmware, read map, authentication or dispatch contract. Growatt VPP protocol V2.01 omits XHU from its model/DTC annex.

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.

• The manual's RS485-IN and RS485-OUT have two functions on different pins: pins 1/4/5 for Meter2, ShineBus or ShineMaster, and pins 7/8 marked EMS/VPP. A connector label is not an inverter register map or permission for a second master.
• 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's public VPP protocol V2.01 has command registers but its DTC annex lists WIT 100KTL3-H, not WIT 4-25K-XHU. Applying its register numbers to this model without Growatt's explicit firmware mapping would be unsafe.
• 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. Obtain an XHU-specific third-party contract

   Ask Growatt or the plant integrator for the exact firmware's approved read endpoint, physical connection, Modbus TCP/RTU role, register map, units, scaling, permitted client count and access controls. Obtain a separate dispatch/control contract if flexibility is required.

4. Verify independent measurement

   Only after a documented read path is approved, compare simultaneous PV, battery, grid and load values with Growatt's local display and an independent site meter. Confirm signs, CT direction, timestamps, stale-data behavior and state transitions.

5. Keep dispatch under approved control

   Do not test VPP writes or DRMS contacts from a generic protocol PDF. Commission generator start, backup, export limit and battery priorities with the system designer, including fail-safe behavior and authority arbitration.

Common questions

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

Growatt's product page says Modbus TCP is available, but the retained page and manual do not identify which XHU firmware or accessory hosts it, its port, security, register set or simultaneous-client rules. Treat a direct Edge read as unverified until the exact interface contract is supplied.^1, 4

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

The manual marks RS485-IN/OUT pins 7/8 as EMS/VPP, but pin labels do not define commands, permissions, priority, acknowledgement or fail-safe behavior. Growatt VPP protocol V2.01 does not list this XHU family in its model/DTC annex. Obtain an exact-firmware approval and controls design before dispatch.^1, 5

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