Growatt SPH TL3 BH UP

Use cases

• Monitor PV production, battery SOC, and grid exchange on a live cloud dashboard for your customer.
• Create alerts when battery temperature or inverter temperature exceeds safe operating thresholds.
• Automate battery charging during low electricity prices and discharging during peak price windows using spot price data.
• Limit or stop PV export to the grid automatically when energy prices turn negative.
• Track daily and total energy production and consumption to generate periodic performance reports.
• Remotely adjust charging power rate and export limits without an on-site visit.

Installation

1. 1Connect the Modbus gateway to the RS485-3 port on the Growatt SPH TL3 BH UP inverter using a twisted-pair cable (A, B, GND).
2. 2Configure the RS485 connection on the gateway to 9600 baud, 1 stop bit, no parity, and set the Modbus slave address to 1 (default).
3. 3On the inverter, set Export mode to ON (manual ref 6.4.4 par 6) and change the RS485 setting to VPP (manual ref 6.4.4 par 7).
4. 4If AC charging is required, enable it on the inverter or via server.growatt.com and set the time frame to 00:00 to 23:59.
5. 5Do not connect the Growatt energy meter on the same Modbus data link as the gateway, as this causes inverter reboots.
6. 6Import the Growatt SPH TL3 BH UP template in the ModbusCloud platform and verify that live readings appear on the dashboard.

Things to watch for

01

Why does my Growatt inverter keep rebooting after connecting the Modbus gateway?

The Growatt energy meter and the Modbus gateway must not share the same RS485 bus. Keep the meter on its dedicated link to the inverter and connect the gateway to the RS485-3 port only.

02

I cannot control battery charging or export limits. What settings are missing?

Ensure the RS485 setting on the inverter is set to VPP (manual ref 6.4.4 par 7). Also verify that Export mode is ON. If AC charging is needed, enable it with a 00:00 to 23:59 time frame via the inverter menu or server.growatt.com.

03

What baud rate and serial settings should I use?

Use 9600 baud, 1 stop bit, and no parity. The default Modbus slave address on the Growatt SPH is 1.

04

Can I use Grid First mode to discharge the battery back to the grid?

Yes. Enable Grid First mode and set the time frame to 00:00 to 23:59 via server.growatt.com. The template then allows you to control discharge timing based on energy prices.

Registers (40)

37 read / 7 write

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