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Reusing a Volkswagen MEB battery (ID.3, ID.4, ID.5, Skoda Enyaq, Audi Q4 e-tron) with an SMA hybrid inverter from the Smart Energy series. SMA uses the proprietary BAT-CAN protocol.
Short answer. A VW MEB pack (NMC 310–460 V, LFP 290–365 V) fits the SMA Sunny Boy Smart Energy 3.6–6.0 single-phase input range of 100–500 V and the Sunny Tripower Smart Energy three-phase input range of 150–500 V. SMA does not accept Pylontech, BYD or generic protocols — it uses its own SMA BAT-CAN. The BMS-EV controller emulates an authorised SMA battery device and forwards MEB BMS telemetry.
| Inverter | Battery DC range | Power | Phase | Notes |
|---|---|---|---|---|
| SMA Sunny Boy Smart Energy 3.6 | 100–500 V | 3.6 kW | Single-phase | NMC 310–460 V fits, LFP 290–365 V fits |
| SMA Sunny Boy Smart Energy 4.0 | 100–500 V | 4.0 kW | Single-phase | MEB fits |
| SMA Sunny Boy Smart Energy 5.0 | 100–500 V | 5.0 kW | Single-phase | MEB fits |
| SMA Sunny Boy Smart Energy 6.0 | 100–500 V | 6.0 kW | Single-phase | MEB fits, NMC peak ~460 V within 500 V cap |
| SMA Sunny Tripower Smart Energy 5.0 | 150–500 V | 5.0 kW | Three-phase | NMC fits, LFP mostly fits (290 V > 150 V) |
| SMA Sunny Tripower Smart Energy 8.0 | 150–500 V | 8.0 kW | Three-phase | MEB fits |
| SMA Sunny Tripower Smart Energy 10.0 | 150–500 V | 10.0 kW | Three-phase | MEB fits, NMC peak ~460 V within 500 V cap |
| SoC | NMC MEB | LFP MEB | SB SE (100–500 V) | STP SE (150–500 V) |
|---|---|---|---|---|
| 0% cutoff | ~310 V | ~290 V | Both fit | Both fit |
| 50% | ~390 V | ~330 V | Both fit | Both fit |
| 100% | ~460 V | ~365 V | Both fit (40 V headroom NMC) | Both fit (40 V headroom NMC) |
NMC MEB has 40 V of ceiling headroom at 100% SoC against SMA's 500 V limit; comfortable in practice because MEB BMS never permits over-voltage. LFP MEB has substantial headroom throughout its range.
SMA Smart Energy uses the proprietary SMA BAT-CAN protocol at 500 kbps. The BMS-EV controller emulates an authorised SMA battery device:
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).
SMA developed its own BAT-CAN protocol independently and has not opened the port to generic vendors. This is the defining difference vs SolaX, FoxESS, Solis, GoodWe, all of which accept Pylontech/BYD directly.
Single-phase homes: Sunny Boy Smart Energy 3.6–6.0. Three-phase homes with 77–82 kWh MEB and higher power needs: Sunny Tripower Smart Energy 5–10 kW.
Yes. The BMS-EV controller auto-detects NMC or LFP from the MEB BMS and reports the correct voltage envelope. LFP MEB fits both SMA windows.
3.10.xx or later on the Smart Energy inverter.
Yes — SMA requires installer credentials to change battery type and grid parameters. Obtain from SMA or your distributor before commissioning.
Yes. MEB BMS SoC is mapped directly to the SMA SoC field the Sunny Portal reads.
Yes with the SMA Automatic Transfer Switch. Discharge power is limited by the MEB BMS current limit BMS-EV reports.
Typical DC-to-AC-to-DC round-trip efficiency of a MEB pack with SMA Smart Energy is 87–91%. Losses come primarily from inverter conversion; pack resistive losses at 0.2–0.3C are ~1–2%.