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Pairing a used Tesla Model 3 or Model Y HV pack with the Sungrow SH RT residential and SH T commercial three-phase hybrid inverter series.
Direct answer. A Tesla Model 3 / Y HV pack (350–410 V nominal) is compatible with the Sungrow SH RT series (SH5.0RT through SH10RT), whose battery DC input accepts 200–800 V. Commercial-scale SH T models (SH15T, SH20T, SH25T) share the same protocol at higher power. The BMS-EV controller can advertise itself either as a Sungrow native SBR/SBH battery module or as a Pylontech HV stack — Sungrow firmware supports both. Native mode gives finer telemetry; Pylontech mode is more portable across firmware revisions.
| Component | Status | Notes |
|---|---|---|
| Tesla Model 3 SR / LR / Performance pack | Yes | NCA and LFP |
| Tesla Model Y LR / Performance pack | Yes | Identical BMS to Model 3 |
| Sungrow SH RT series (5–10 kW) | Yes | Native Sungrow CAN or Pylontech HV |
| Sungrow SH T commercial (15–25 kW) | Yes | Same protocol, higher current |
| Sungrow SG string inverters (SG3K-D, SG10RT etc.) | No | PV-only, no battery port |
| Sungrow SH LV variants | No | 48 V nominal, incompatible with HV pack |
| Model | AC power | Phase | DC battery range | MPPT |
|---|---|---|---|---|
| SH5.0RT | 5.0 kW | 3-phase | 200–800 V | 2 |
| SH6.0RT | 6.0 kW | 3-phase | 200–800 V | 2 |
| SH8.0RT | 8.0 kW | 3-phase | 200–800 V | 2 |
| SH10RT | 10.0 kW | 3-phase | 200–800 V | 2 |
| SH15T | 15.0 kW | 3-phase | 200–800 V | 3 |
| SH20T | 20.0 kW | 3-phase | 200–800 V | 3 |
| SH25T | 25.0 kW | 3-phase | 200–800 V | 3 |
The Tesla Model 3 / Y HV pack operates in the 300–415 V range. The Sungrow SH RT battery input starts at 200 V minimum, and the SBH battery module standard is defined at 320–460 V nominal — a very close match to Tesla's operating window. Maximum charge current on SH10RT is 30 A DC; SH25T supports 50 A. The pack's C-rate limits will constrain charge current below the inverter's ceiling in most configurations.
Two operating modes are available:
| Mode | Sungrow menu selection | BMS-EV emulation target | Notes |
|---|---|---|---|
| Native Sungrow | "SBH200" or "SBR128" | Sungrow SBH battery frames (0x100–0x18F) | Full telemetry incl. per-module info; sensitive to firmware version |
| Pylontech HV | "Pylontech H48050 / H2" | Pylontech HV frames (0x4210–0x4260) | Portable across firmware releases; fewer diagnostic fields |
| Data | Source (Tesla BMS) | Native Sungrow frame |
|---|---|---|
| Pack voltage | 0x132 byte 0–1 | 0x100 byte 0–1 |
| Pack current | 0x132 byte 2–3 | 0x100 byte 2–3 |
| SoC | 0x33A byte 5 | 0x104 byte 0–1 |
| Cell voltages (max/min) | 0x312 byte 0–3 | 0x108 byte 0–3 |
| Temperature max | 0x312 byte 3 | 0x10C byte 0 |
| Charge/discharge limits | Computed | 0x110 byte 0–3 |
| Module topology | Injected by BMS-EV | 0x180 (advertises stack of SBH200 modules) |
Engineering values below are examples. Final conductor cross-section and protective-device sizing must be calculated for the actual pack, maximum current, cable length, installation method, ambient temperature and applicable local standards (IEC 60364-7-712, VDE-AR-N 4105, NEC 690).
For a new installation being commissioned in 2026, use Pylontech HV mode. It is stable across firmware versions, less likely to be affected by future battery whitelisting, and iSolarCloud shows all the important data. Use native Sungrow mode only if a specific feature (e.g. detailed per-module SoH) is required.
The SH RT is designed as a grid-tied hybrid with backup. Continuous off-grid operation is possible on some jurisdictions with the correct configuration but is not the primary use case; for permanent off-grid, consider the Deye SUN or similar dedicated hybrid.
Measured round-trip (AC-in to AC-out) is typically 88–91 % on SH10RT with a Tesla pack, and slightly higher (~92 %) on SH25T thanks to lower relative conversion losses at higher power.
The Sungrow SH RT internally implements a DC-coupled architecture — PV feeds a shared DC bus with the battery, minimising conversion losses. No external DC-DC is required; the BMS-EV controller reports charge current limits and the inverter allocates PV energy accordingly.
Yes. The Sungrow installer menu has "Reserved SoC" (minimum) and "Force charge to SoC" settings. Configure 20 % / 90 % to reduce cycling stress on an aged Tesla pack.
The SH RT disconnects from the grid within 200 ms and switches loads to the backup output. The battery continues to supply energy up to the inverter's continuous backup power rating (e.g. 5 kW for SH5.0RT).
Sungrow's inverter warranty is unaffected by the choice of battery — it covers only the inverter itself. Battery warranty is not covered by any party; second-life pack risk is borne by the installer/owner.