Inverter: Sungrow - dalathegreat/Battery-Emulator GitHub Wiki

[!CAUTION] Working with high voltage is dangerous. Always follow local laws and regulations regarding high voltage work. If you are unsure about the rules in your country, consult a licensed electrician for more information. DC ARC is a REAL THING - ENSURE NO LOAD is on any DC wires before working on the system.

Contents

Compatible Inverters

Model BYD CAN Sungrow SBRXXX CAN Notes
SH5.0/6.0/8.0/10RT ✅ ✅
SH3.0/3.6/4.0/5.0/6.0RS ✅ ✅
SH3.0/3.6/4.0/5.0/6.0RS (Australia) ❌ ✅ No BYD support. Old firmware may work with BYD
SH8.0RS/SH10RS (Australia) ❌ ✅ No BYD support
SH15T/SH20T/SH25T ✅ ✅ Some regions dropping BYD support
SH15T/SH20T/SH25T (Australia) ❌ ✅ No BYD support

[!NOTE] Sungrow is promoting their own battery systems and dropping third-party battery support in some regions. As of June 2024, Australia has officially dropped all support for non-Sungrow batteries. If your inverter lacks BYD support, use the Sungrow SBRXXX protocol instead.

Protocol Selection

BYD CAN Protocol

Use "BYD Battery-Box Premium HVS over CAN Bus" for inverters with BYD support.

Sungrow SBRXXX Protocol

Use "Sungrow SBRXXX battery over CAN bus" for inverters without BYD support (e.g., Australian models).

When using this protocol, select the battery model that best matches your actual battery capacity:

Model Capacity Modules Min V Max V
SBR064 6.4 kWh 2 108 V 146 V
SBR096 9.6 kWh 3 162 V 219 V
SBR128 12.8 kWh 4 216 V 292 V
SBR160 16.0 kWh 5 270 V 365 V
SBR192 19.2 kWh 6 324 V 438 V
SBR224 22.4 kWh 7 378 V 511 V
SBR256 25.6 kWh 8 432 V 584 V

See the SBR battery datasheet for full specifications.

[!NOTE] The Sungrow SBRXXX protocol uses 250 kbps CAN bitrate, which differs from most battery protocols. This means you cannot have an EV battery on the same CAN channel as the Sungrow

[!IMPORTANT] The emulator sends your actual battery's minimum and maximum voltage limits to the inverter. Before connecting, verify that your battery's voltage range is compatible with your Sungrow inverter's supported battery voltage range (check your inverter's datasheet).

Hardware Setup

CAN Wiring

Sungrow inverters have the wiring diagram on the side of the unit. Check your specific model. Example for SHxxRS inverters:

SHxxRS wiring diagram

[!NOTE] Sungrow inverters have an inbuilt fuse on the battery terminals. Check the data spec sheet for details.

Fuse location

Grounding

⚠ī¸ Grounding is critical. Ensure:

  • Battery case is connected to protective earth (PE)
  • CAN twisted pair shield is connected to PE

Failing to ground properly will result in CAN errors.

CAN Termination

When the LilyGo board connects to both a CAN battery and CAN inverter on the same pins, and both ends have termination resistors, remove the terminating resistor from the board. See CAN troubleshooting for details.

ℹī¸ To verify wiring: With inverter powered on and CAN wires connected only to the inverter, you should measure over 1V (e.g., 1.38V).

Dedicated CAN Channel (Recommended)

[!CAUTION] Safety Warning: If using a single CAN channel and the LilyGo board disconnects while the system is running (wire break or hardware failure), the inverter will continue charging/discharging the battery. The Sungrow inverter interprets automotive CAN messages as the system being alive, which can lead to dangerous over/under-charge conditions.

For maximum safety and stability, use a dedicated CAN channel for the inverter. Options:

[!NOTE] Some Sungrow inverters (e.g., SH5.0RS with Leaf battery) have CAN communication issues when battery and inverter share the same LilyGo channel. A dedicated channel resolves this.

Inverter Configuration

Self-Consumption Mode

To limit grid export (feed-in), you need a Sungrow Smart Meter (e.g., DTSU666 included with SH10RT) to measure consumption and generation.

Configure via Winet-S local web interface, iSolarCloud app, or isolarcloud.com:

Winet-S local web interface:

iSolarCloud.com:

[!NOTE] iSolarCloud takes 10-15 minutes to update inverter settings.

Operation

Startup Timing

The Sungrow inverter is sensitive to startup timing. If the inverter shows "battery not detected":

  1. Start the complete system (inverter → battery emulator → battery) in quick succession
  2. If the emulator complains about missing inverter, reboot the emulator
  3. Repeat 2-3 times until inverter and emulator sync up

Once synchronized, they will communicate reliably.

Nissan Leaf Battery Procedure

Startup

  1. Start the Sungrow inverter via AC switch
  2. Turn on the Solar DC switch
  3. Turn on the Battery DC switch
  4. Start the Leaf battery BMS with 12V
  5. Start the LilyGo hardware with 5V
  6. Handle precharge/contactor closing (manually or automatically via LilyGo)

Shutdown

  1. Turn off the Leaf BMS (cut 12V supply). Wait 60 seconds.
  2. LilyGo status LED will turn red. Inverter will stop using the battery within 30 seconds.
  3. After 30 seconds, turn off contactors (if not handled automatically)
  4. Turn off the Sungrow inverter via AC switch
  5. Turn off the Battery DC switch
  6. Turn off the Solar DC switch

Troubleshooting

Firmware Compatibility

User report: SH10RT firmware upgrade from SAPPHIRE-H 03011.95.01 to .95.07 caused data loss. Downgrading to 95.01 restored functionality.

Factory Reset WiNet-S Modul

To factory reset a Sungrow WiNet-S module, press and hold the small button on the dongle for over 30 seconds until the RUN indicator blinks fast. This restores default settings, resets the password to the default ("pw8888"), and clears Wi-Fi configurations.

Error Codes 714, 703, "Inverter_missing"

If you experience these errors (common on SH10RT(AU)):

  1. Clear all faults, error codes, and battery emulator events
  2. Wait for the system to complete automatic handshake
  3. Communication should restore automatically

Tested Configurations

BYD CAN Protocol:

  • Battery Emulator firmware: 8.0

Sungrow SBRXXX Protocol:

  • Battery Emulator firmware: 9.1.4
  • Inverter: SH10RS (AU)
  • LCD (ARM) firmware: SUNSTONE-H_01011.02.55
  • MDSP firmware: SUNSTONE-H_03021.01.09
  • SDSP firmware: SUNSTONE-H_04011.02.03
  • AFCI firmware: AFCI_06002.10.11

Hardware configuration example: RJXZS BMS → CAN NATIVE (LilyGo) → Battery Emulator → MCP2515 CAN module (J1 header jumped) → Inverter PIN5 and PIN7