SMA Solar Technology Sunny Tripower X 25

Compatibility

Compatible through Modbus TCP

SMA publishes a model-specific register package and the ennexOS Modbus server interface. The worked read uses the SMA profile and the inverter’s own device scope, not a system aggregate or a borrowed SunSpec register address.

Sunny Tripower X 25, type STP 25-50 (non-US), using the model-specific parameter package for firmware 03.16.xx.R. Operating manual version 1.4 covers firmware 3.06.15.R and later, but the worked register definitions here are pinned to 03.16.xx.R. STP 25-US-50, Sunny Tripower X 60 and Sunny Tripower Hybrid X are outside this guide.

Connect it with

• 
  Gateway ZGW-20
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Models

Specifications

The current operating manual allows configuration as a System Manager or as a subordinate device. In System Manager mode it describes a maximum system size of 135 kVA and up to five additional devices, with device-type limits applying. The inverter can also sit below a separate SMA Data Manager. This guide leaves the existing management role intact and adds only a bounded read of the inverter’s own values. It does not change country settings, power limits, protection functions or the ownership of site-level control.^1, 3

Exact type

STP 25-50, Sunny Tripower X 25, non-US¹

Nominal AC output

25 kW, three-phase¹

PV topology

Three MPP trackers; PV inverter, not Hybrid X¹

Register scope

Parameter package for firmware 03.16.xx.R²

Default server transport

Modbus TCP, port 502; interface disabled by default¹

Device versus system

Unit 3: device values; unit 2: system values; unit 1: product information³

Selected identity

30053, U32 TAGLIST; code 9488 identifies Sunny Tripower X 25²

Selected active power

30775, S32 FIX0, W, unit ID 3²

Total yield

30513, U64 FIX0, Wh, unit ID 3²

Environment

IP65; -25 to +60 °C installation temperature range¹

Interface

Documented measurements and integration boundaries for Sunny Tripower X 25.

• Device type code and other documented identity fields.
• Instantaneous active power from the individual inverter, in watts.
• Total yield as an unsigned 64-bit watt-hour counter.
• Model-supported AC and DC measurements, each with its own data width and format.

Setup

1. Match the model and firmware

   Sunny Tripower X 25, type STP 25-50 (non-US), using the model-specific parameter package for firmware 03.16.xx.R. Operating manual version 1.4 covers firmware 3.06.15.R and later, but the worked register definitions here are pinned to 03.16.xx.R. STP 25-US-50, Sunny Tripower X 60 and Sunny Tripower Hybrid X are outside this guide.

2. Preserve the existing system role

   Record whether this inverter is System Manager or subordinate. Do not change that role to obtain a measurement. Keep the inverter, whole-system and downstream-device identities separate in the point names and client configuration.

3. Enable the local server deliberately

   The interface is disabled by default. Use the documented local configuration with an authorised installer or administrator, then verify the configured port, normally 502. Keep access on the intended site network; the operating manual says not to use port forwarding for Modbus.

4. Select the individual inverter endpoint

   Use SMA profile unit ID 3 for the worked device registers. Unit 1 identifies the product, unit 2 is system scope, and assigned IDs of 10 and above address connected devices. Do not apply the older generic SMA SunSpec unit-ID offset rule to this ennexOS configuration.

5. Read identity before measurements

   Read FC03 at literal decimal address 30053, quantity 2. A U32 TAGLIST value of 9488 identifies Sunny Tripower X 25 in this firmware package. Then read 30775 as two registers for signed active power, or 30513 as four registers for total yield. Read each multi-register item together.

6. Validate the data and pace requests

   Use big-endian order and each entry’s documented format. FIX0 requires no decimal scaling. Treat S32 0x80000000 and U64 all-ones as unavailable, not as real measurements. The ennexOS interface recommends at least one second between transfers and no more than five parameters or measured values simultaneously. Compare the result with the inverter’s own live display.

Common questions

Why is unit ID 2 wrong for this worked read?

The ennexOS interface reserves unit 2 for system parameters and measurements. The exact device map assigns active power and total yield to unit 3. Mixing the two scopes can produce the wrong site interpretation even when a response is syntactically valid.^2, 3

Can I use fixed SunSpec addresses instead?

SMA also documents SunSpec for ennexOS. Its supported models are included dynamically and are traversed using each model’s ID and length. That is a separate configuration and discovery path; the literal addresses in this guide belong to the SMA profile.^3, 4

Does the register range mean this model is rated 50 kW?

No. A register’s allowed numeric range is not the inverter nameplate rating. The STP 25-50 operating manual gives a 25 kW rated AC output; a broader range in the register definition does not change that rating.^1, 2

Can this monitoring client change export limits?

Not through the read-only procedure here. Grid management and control registers have additional operating and permission requirements. The Modbus document also warns that repeated writes to persistent settings can damage flash memory.³

Does a communication failure mean zero production?

No. Missing replies and unavailable sentinels must remain distinguishable from a valid zero-watt value. Otherwise outages in data collection can appear as genuine generation changes.³