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Battery System Setup
PowerSync supports two methods for accessing your Tesla Powerwall. Choose one — you don't need both.
The easiest setup option. Teslemetry is a third-party proxy service for Tesla API.
| Pros | |
|---|---|
| Simple API key authentication | No OAuth complexity |
| Works with localhost | No public domain needed |
| 2-minute setup | Just copy/paste API key |
| Reliable service | Well-maintained proxy |
Setup:
- Sign up at https://teslemetry.com
- Connect your Tesla account
- Copy your API key
- Paste into PowerSync settings
Direct OAuth access to Tesla's Fleet API. Completely free but requires more setup.
Setup:
- Install the official Tesla Fleet integration in Home Assistant
- Settings > Devices & Services > Add Integration > "Tesla Fleet"
- Follow the OAuth login flow
- PowerSync automatically detects your Tesla Fleet credentials
- Leave the Teslemetry field empty during PowerSync setup
Supports H1, H3, H3-Pro, H3 Smart, and KH model families via Modbus TCP or RS485 serial. No cloud API required for battery control — all control is done locally via Modbus.
OEM rebrands using identical hardware are also supported — the model family is auto-detected via register probing during setup.
| Model Family | Type | Register Space | OEM Rebrands |
|---|---|---|---|
| H1 | Single Phase | 31xxx/41xxx | AIO-H1, a-TroniX AX |
| H3 | Three Phase | 31xxx/41xxx | AIO-H3, Kuara H3, Sonnenkraft SK-HWR, 1KOMMA5 |
| H3-Pro | Three Phase (Higher Power) | 37xxx/46xxx/49xxx | — |
| H3 Smart | Three Phase (Native WiFi) | 37xxx/46xxx/49xxx | — |
| KH | Single Phase Hybrid | 31xxx/41xxx | — |
Rebrands: If your inverter is an OEM rebrand (e.g., Kuara, Sonnenkraft, 1KOMMA5), just connect it like any other FoxESS unit. PowerSync identifies the model family automatically from Modbus registers — no special configuration needed.
Modbus TCP (Recommended for H3 Smart)
- Port: 502 (default)
- Slave ID: 247 (default)
- For H3 Smart: Connect directly to the inverter's IP address — no external adapter needed
RS485 Serial
- Baud rate: 9600 (default)
- Slave ID: 247 (default)
- Requires an RS485 adapter (USB or network gateway like Elfin EW11)
The H3 Smart has a built-in WiFi Modbus TCP server. No external RS485 adapter is needed.
- Find the inverter's IP address — it appears as "espressif" on your network (it uses an ESP WiFi module)
- Ensure firmware is up to date — the Modbus TCP server requires current firmware
- Use default settings — Port 502, Slave ID 247
- PowerSync will auto-detect the model as H3 Smart during setup
Troubleshooting: If the connection test fails:
- Check your router for a device named "espressif" to find the correct IP
- Update inverter firmware to the latest version
- Verify port 502 is not blocked by your network
A FoxESS Cloud API key allows PowerSync to sync Amber/Octopus prices as time-based schedules on your inverter (up to 8 periods per day). This is not required for battery control — all control is done locally via Modbus.
Getting your API key:
- Log in to foxesscloud.com
- Go to User Profile > API Management
- Generate a new API key
- Enter the API key and your device serial number during PowerSync setup
Note: When Smart Optimization (LP) is enabled, cloud schedule sync is automatically skipped — the LP optimizer controls the inverter directly via Modbus, and uploading schedules to the cloud would conflict.
| Mode | Value | Description |
|---|---|---|
| Self Use | 0 | Default operation |
| Feed-in First | 1 | Export priority |
| Backup | 2 | Backup mode |
| Force Charge | 3 | Force charge from grid |
| Force Discharge | 4 | Force discharge/export |
Full support for Sigenergy hybrid inverters with integrated battery storage.
- Tariff Sync via Cloud API — Uploads pricing to Sigenergy Cloud using 30-minute TOU format
- Real-Time Energy Data via Modbus — Reads solar, battery, grid power and SOC from your inverter
- DC Solar Curtailment — Controls DC solar via Modbus TCP during negative prices (load-following mode)
| Connection | Purpose | Required |
|---|---|---|
| Cloud API | Tariff sync to Sigenergy | Yes |
| Modbus TCP | Real-time energy data + DC curtailment | Yes |
Important: Modbus TCP Server must be enabled on your Sigenergy inverter before PowerSync can connect. This setting is typically configured by your installer via the SigenStor app or installer portal.
Device ID Note: If you have an AC Charger installed, it uses Device ID 1 by default. The inverter must be set to a higher ID (e.g., 2).
What You Need:
| Credential | Description | Where to Find |
|---|---|---|
| Your Sigenergy account email | Your login email | |
| Password | Your Sigenergy account password | Your normal password |
| Device ID | Optional — usually not needed | Leave blank (see note below) |
| Station ID | Your Sigenergy station identifier | SigenAI or browser dev tools |
Device ID (optional):
Sigenergy no longer requires a Device ID for authentication. Leave this field blank. If authentication fails without it, you can find it by:
- Go to https://web-aus.sigencloud.com/ in your browser (don't log in yet)
- Open Developer Tools (F12) > Network tab > filter by Fetch/XHR > check "Preserve log"
- Log in normally
- Find the
tokenPOST request > Payload tab > look for userDeviceId (13 digits)
Getting Station ID:
- Ask SigenAI in the app: "Tell me my StationID"
- Or find it in dev tools network requests
- Select Sigenergy as your battery system
- Enter Cloud credentials (email, password)
- Select your station from the list
- Enter your inverter's Modbus IP address
- Optionally enable DC solar curtailment
Full support for GoodWe hybrid inverters via the goodwe Python library. Local connection only — no cloud API required.
- Auto-Detection — Model family is automatically identified during setup
- Force Charge/Discharge — Via ECO_CHARGE and ECO_DISCHARGE operation modes
- Backup Reserve — Set minimum SOC via depth-of-discharge control
- Grid Export Limit — Configurable export power limit
- Battery Health — SOH read from inverter
| Series | Type | Battery Control |
|---|---|---|
| ET | Three Phase Hybrid | Full support |
| EH | Three Phase Hybrid | Full support |
| BT | Three Phase Hybrid | Full support |
| BH | Three Phase Hybrid | Full support |
| ES | Single Phase Hybrid | Full support |
| EM | Single Phase Hybrid | Full support |
| BP | Single Phase Hybrid | Full support |
| DT/MS/XS | Grid-only (no battery) | Not supported |
UDP via WiFi Dongle (Default)
- Port: 8899
- Works with most GoodWe inverters out of the box
- Uses the inverter's WiFi dongle for communication
TCP via LAN Dongle
- Port: 502
- Requires a GoodWe LAN dongle (WLA0000-01-00P V2.0)
- More reliable for installations with poor WiFi
- Find the inverter's IP address — check your router's device list for the WiFi or LAN dongle
- Select GoodWe as your battery system during PowerSync setup
- Enter the inverter's IP address
- Select the protocol (UDP or TCP) matching your dongle type
- The port defaults automatically (8899 for UDP, 502 for TCP)
- PowerSync tests the connection and auto-detects your inverter model
Note: If setup reports "no battery support", your inverter is a grid-only model (DT/MS/XS series) which does not have battery control capabilities.
| Mode | Description |
|---|---|
| General | Normal self-consumption operation |
| ECO Charge | Force charge from grid (used by force_charge) |
| ECO Discharge | Force discharge to grid (used by force_discharge) |
GoodWe uses Depth of Discharge (DOD) internally. PowerSync converts automatically:
- Setting backup reserve to 20% → DOD = 80%
- Setting backup reserve to 100% → DOD = 0% (full backup)
- Maximum DOD is capped at 89% (minimum 11% reserve)
Full support for Sungrow SH-series hybrid inverters via direct Modbus TCP. No cloud API required.
- Direct Modbus Control — All control via local Modbus TCP
- Force Charge/Discharge — Manual or automatic battery control
- Rate Limiting — Set maximum charge and discharge rates (kW)
- Export Limit Control — Limit grid export power
- Backup Reserve — Configure minimum SOC for backup power
- Battery Health Monitoring — Read SOH directly from BMS
- AEMO Spike Auto-Discharge — Automatic VPP participation for Globird users
| Series | Type | Battery Control |
|---|---|---|
| SH-series | Hybrid Inverter | Full support |
| SG-series | String Inverter | AC curtailment only (no battery) |
| Setting | Default |
|---|---|
| Port | 502 |
| Slave ID | 1 |
| Register | Function |
|---|---|
| 13021 | Battery SOC (0.1%) |
| 13022 | Battery SOH (0.1%) |
| 13050 | EMS Mode (0=Self-consumption, 2=Forced) |
| 13051 | Charge Command (0xAA=Charge, 0xBB=Discharge, 0xCC=Stop) |
| 13059 | Minimum SOC / Backup Reserve (0.1%) |
| 13066 | Max Discharge Current (0.001A) |
| 13067 | Max Charge Current (0.001A) |
| 13074 | Export Power Limit (W) |
If you have two Sungrow SH inverters — for example, a grid-facing primary and a secondary on the primary's backup port — PowerSync can manage both as a single combined system.
How it works:
- During initial setup, after configuring the primary inverter you'll be prompted to optionally add a second inverter's IP address
- Both inverters are polled independently and their data is aggregated into a single view
- Solar, battery power, and load are summed across both inverters
- Grid power uses the primary inverter only (it's the grid-facing unit)
- Battery SOC is averaged across both (equal weight)
- Commands (force charge, force discharge, restore) are sent to both inverters simultaneously
- Charge/discharge rate limits are split equally between both inverters
- Export limits are set on the primary only (the grid-facing inverter)
Setup:
- Configure your primary (grid-facing) Sungrow inverter as normal
- On the "Secondary Sungrow Inverter" step, enter the IP of your second inverter
- PowerSync tests the connection and stores both configurations
- To add/remove a secondary later, go to Settings > Devices & Services > PowerSync > Configure
Safety features:
- If the secondary inverter fails to connect on startup, PowerSync falls back to single-inverter mode automatically
- Per-inverter SOC is logged when SOC divergence exceeds 5%
- Each sub-coordinator polls independently — a temporary Modbus failure on one inverter doesn't block the other
- Removing the secondary IP in the options flow cleanly removes all secondary config
Globird's VPP program pays premium rates during AEMO price spikes ($3000/MWh or above). PowerSync can automatically participate:
- Enable AEMO Spike Auto-Discharge in the mobile app Controls screen
- Select your NEM region (NSW1, VIC1, QLD1, SA1, TAS1)
- When AEMO prices hit $3000/MWh, PowerSync automatically forces battery discharge
- When the spike ends, battery returns to normal operation
- Push notifications are sent for both spike start and end
Tip: If you also have a separate AC-coupled solar inverter, configure it in the AC Inverter Curtailment section. PowerSync will validate that your Sungrow battery and AC inverter don't use the same Modbus slave ID.