SofarSolar SOFAR 80…136KTL (battery)
The SofarSolar SOFAR 80...136KTL is a three-phase string inverter series used in commercial and utility-scale PV installations, covering models including HYD 5...20K-3PH, HYD 3...6K-EP, SOFAR 80...136KTL, and SOFAR 5...24KTL-G3. This template targets the battery control interface over Modbus RTU, exposing the battery mode setpoint register at address 4368. Writing to this register via the ModbusCloud Gateway lets you command charge, discharge, or passive operating modes from the cloud portal. One targeted write register, used carefully, keeps battery dispatch under external supervisory control.
- Protocol
- Modbus RTU
- Connection
- RS485
- Registers
- 1, read and write
- Brand
- SofarSolar
- Compatible models
- HYD 5…20K-3PH · HYD 3…6K-EP · SOFAR 80…136KTL · SOFAR 5…24KTL-G3
- Last updated
Registers (1)
0 read, 1 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| batterymode | Write |
Loading registers…
Send your device list
If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Command the inverter into passive mode to hand off battery dispatch decisions to an external energy management system.
- Force a charge cycle during off-peak tariff windows by writing the charge mode value to register 4368.
- Switch to discharge mode during peak-demand periods to reduce grid import and verify the inverter responds correctly.
- Alert on unexpected mode state by scheduling periodic confirmation reads against the last written value.
- Track mode change timestamps in the ModbusCloud portal to build an audit log of battery dispatch events.
Installation
Enable Modbus RTU on the inverter: on the LCD panel, navigate to the communication or settings menu and confirm the Modbus address (default 1, range 1 to 63) and baud rate (default 9600, 8N1).
Wire the RS485 bus: connect A+ and B- from the inverter COM port to the corresponding terminals on the ModbusCloud Gateway, and fit a 120-ohm termination resistor at the last device on the bus.
In the ModbusCloud portal, add the ModbusCloud Gateway, import the SofarSolar SOFAR 80...136KTL (battery) template, and set the unit ID to match the inverter's configured Modbus address.
Verify connectivity by triggering a test read on the batterymode register (address 4368) in the portal and confirming a valid integer response before issuing any write commands.
Things to watch for
My write to register 4368 returns an error. What is wrong?
The SofarSolar Modbus User Guide specifies that writes to address 4368 must start exactly at that address with a write length of exactly 1 register using function code 0x10. Writing a different length or starting offset will be rejected. Confirm the template uses FC 16 and length 1, and check firmware is current for your model.
The gateway connects but register 4368 shows no response. What now?
Check the RS485 wiring polarity: A+ and B- can be inadvertently swapped, which prevents any communication. Also verify the Modbus address in the portal matches the address set on the inverter LCD. The default baud rate is 9600/8N1; a mismatch will produce timeouts.
Is there a risk of damaging the inverter by writing the wrong mode value?
Yes. Register 4368 is a live operational setpoint that changes inverter battery behaviour immediately. Writing an unsupported or out-of-range value can trigger protection faults or put the battery into an unintended state. Always confirm the valid mode values for your specific model firmware before writing, and test in a controlled window, not during peak production.
Communication worked, then stopped after a firmware update. Why?
SofarSolar has changed Modbus register behaviour and protocol variants across firmware versions for the KTL and HYD series. After a firmware update, re-check the Modbus protocol family applicable to your serial number, confirm the baud rate has not been reset, and update the inverter firmware to the latest version before re-establishing communication.
Want to see how it works?
