SMA Hybrid Inverters with Second-Life EV Batteries

SMA Solar Technology AG produces four inverter families relevant to EV second-life: Sunny Boy Storage (HV DC-coupled battery inverter, 100–550 V DC per sma.de datasheet — note: this is NOT a 48 V LV inverter as sometimes stated; the SBS 2.5 was an older LV variant now discontinued), Sunny Boy Smart Energy (HV single-phase hybrid), Sunny Tripower X (three-phase hybrid), and Sunny Tripower Smart Energy (three-phase HV hybrid).

What SMA hybrid inverters do. SMA covers four hybrid inverter families in Europe: Sunny Boy Storage 3.7/5.0/6.0 (HV DC-coupled battery inverter with 100–550 V DC input, 3.7–6 kW, per official SMA datasheet), Sunny Boy Smart Energy 3.6/4.0/5.0/6.0-50 (HV single-phase hybrid, 100–500 V DC battery port), Sunny Tripower X 12/15/20/25 (three-phase hybrid up to 25 kW), and Sunny Tripower Smart Energy 8.0/10.0 (three-phase HV hybrid). Battery communication is CAN 500 kbps using SMA-native protocol or Pylontech / BYD emulation depending on the model. Compatible EV packs range from 48 V Leaf-derived blocks (Sunny Boy Storage) to factory HV Tesla, BMW i3, and VW MEB (Smart Energy series).

About SMA

SMA Solar Technology AG is a German inverter manufacturer, headquartered in Niestetal near Kassel, in operation since 1981. SMA is the oldest inverter brand in the residential PV market and manufactures in Germany (Niestetal) and China (Denselow). Battery communication protocols are documented in "SMA Battery Communication CAN Protocol" (German + English), available to certified installers. SMA offers a 5-year standard warranty, extendable to 10 or 20 years.

Life projection methodology: calendar and cycle life projections above are estimated using published NCA/LFP/NMC degradation curves (Preger et al. 2020, Recurrent 2025 fleet data, Geotab 2023 EV battery health report) combined with typical residential cycling patterns (15–25 % daily DoD, 20–35 °C ambient). Individual pack performance depends on charging history, temperature exposure and cycle depth — always verify SoH before purchase and re-verify annually.

Supported models

Model family	Model examples	Phase	AC output	Battery DC	Comms
Sunny Boy Storage (SBS)	SBS 3.7-10, SBS 5.0-10, SBS 6.0-10	1P	3.7–6 kW	100–550 V DC (360 V rated, per sma.de)	CAN 500k (SMA / BYD HVS)
Sunny Boy Smart Energy (SBSE)	SBSE 3.6-50, SBSE 4.0-50, SBSE 5.0-50, SBSE 6.0-50	1P	3.6–6 kW	100–500 V (HV)	CAN 500k (BYD / SMA)
Sunny Tripower X (STPX)	STP 12-50, STP 15-50, STP 20-50, STP 25-50	3P	12–25 kW	150–1000 V PV; AC-coupled battery	SEMS / Modbus (battery via external)
Sunny Tripower Smart Energy (STPSE)	STPSE 8.0-50, STPSE 10.0-50	3P	8–10 kW	100–500 V (HV)	CAN 500k (BYD / SMA)

DC voltage ranges

Sunny Boy Storage (SBS 3.7-10 / 5.0-10 / 6.0-10): 100–550 V DC battery port (360 V rated, per sma.de). HV DC-coupled battery inverter — no PV MPPT; pair with a separate PV inverter. Fits BMW i3 (260–395 V), Tesla Model 3 LR NCA (260–410 V), Nissan Leaf whole pack (240–398 V), VW MEB (270–410 V for 96s2p, 310–460 V for 108s2p).
Sunny Boy Smart Energy (SBSE): 100–500 V battery port. Single-phase HV hybrid with PV MPPT (100–800 V PV window).
Sunny Tripower X (STPX): 150–1000 V PV input. No native battery port — battery integration is AC-coupled via a separate battery inverter (typically SBSE or SBS).
Sunny Tripower Smart Energy (STPSE): 100–500 V battery port. Three-phase hybrid with PV MPPT (100–800 V PV window).

Communication protocol

SMA supports two CAN modes:

SMA native mode: Proprietary frame set, used for SMA's own battery products (SMA Home Storage Solution, etc.). BMS-EV can emit these frames for advanced installations.
BYD-emulation mode: Standard on SBSE and STPSE for BYD Battery-Box compatibility. Uses the BYD HVM/HVS frame IDs (0x100, 0x101, 0x102, 0x103, 0x104, 0x105, 0x150).
BYD HVS emulation: Sunny Boy Storage EU accepts BYD Battery-Box HVS-compatible batteries. BMS-EV emits BYD HVS frames.

CAN ID (BYD mode)	Direction	Content
0x100	Battery → Inverter	Alarm and protection status
0x101	Battery → Inverter	Charge/discharge V and I limits
0x102	Battery → Inverter	SOC, SOH
0x103	Battery → Inverter	Pack V, I, T
0x104	Battery → Inverter	Cell min/max V, min/max T
0x105	Battery → Inverter	Manufacturer, model
0x150	Inverter → Battery	Inverter status, action request

Heartbeat 1 Hz. Timeout 60 s. Fault codes: SBSE / STPSE display "3701" (BMS communication lost). SBS displays "Error 6501" on missed BMS heartbeat.

Battery compatibility

EV battery pack	Voltage	Recommended SMA model
Nissan Leaf whole pack (24/30/40 kWh)	240–398 V	Sunny Boy Storage (SBS 3.7–6.0)
Renault Zoe whole pack (ZE40/ZE50)	300–410 V	Sunny Boy Storage (SBS 3.7–6.0)
Tesla Model 3/Y	315–403 V	SBSE (cap 480 V), STPSE
BMW i3	260–402 V	SBSE, STPSE
VW MEB (ID.3/ID.4/Enyaq)	288–418 V	SBSE (cap 480 V), STPSE
Nissan Leaf 62 kWh	350–403 V	SBSE, STPSE
Hyundai/Kia 400 V E-GMP	320–400 V	SBSE, STPSE
Renault Zoe R135	300–400 V	SBSE, STPSE
Hyundai/Kia 800 V E-GMP	500–800 V	Not supported (exceeds 500 V ceiling)
Porsche Taycan / e-tron GT	612–835 V	Not supported

Wiring architecture

┌───────────────────┐ ┌────────────────┐ ┌──────────────────┐ │ EV battery pack │ │ BMS-EV │ │ SMA hybrid │ │ (Leaf 48 V or │ DC │ Controller │ CAN │ Battery port │ │ Tesla / i3 / │──────►│ (precharge + │──────►│ 41–63 V (SBS) │ │ MEB HV) │ │ translator) │ │ 100–500 V (SBSE) │ │ │ │ │ │ 100–500 V (STPSE)│ │ Vehicle BMS kept │ CAN │ BYD or │ │ │ │ alive by 12 V │◄─────►│ Pylontech │ │ PV MPPT (SBSE/ │ │ from BMS-EV aux │ │ frame emu. │ │ STPSE hybrids) │ └───────────────────┘ └────────────────┘ └────────┬─────────┘ │ │ AC 230 V (SBS/SBSE) │ AC 400 V 3P (STPSE) ▼ Grid + loads (STPX PV inverter may share AC bus)

Common integration guides

Known limitations

500 V DC ceiling on Smart Energy. Both SBSE and STPSE top out at 500 V. 800 V native packs (Taycan, Ioniq 5, EV6) are not compatible.
Sunny Tripower X has no battery port. STPX is a PV-only three-phase inverter — battery integration is AC-coupled via a separate battery inverter. Add SBS (LV) or SBSE (HV) on the AC side, not a direct STPX battery port.
Sunny Boy Storage is AC-coupled only. No PV MPPT input. Pair with SMA Sunny Boy or Sunny Tripower PV inverter on the same AC bus.
Battery whitelist strict. SMA firmware whitelists specific BYD Battery-Box and LG Chem RESU model strings. BMS-EV emits a whitelisted string; verify acceptance in the SMA Sunny Portal.
Slower firmware release cadence. SMA firmware updates less frequently than Chinese vendors. Verify battery protocol version on installed firmware before commissioning.
Higher price point. SMA prices are 30–60% above Chinese equivalents. Justified by warranty length (up to 20 years) and EU manufacturing but relevant for budget-sensitive installs.

FAQ

Which SMA model should I use for a Tesla Model 3 pack?

Sunny Tripower Smart Energy (STPSE 8.0-50 or 10.0-50) for three-phase installations, or Sunny Boy Smart Energy (SBSE 5.0/6.0-50) for single-phase homes. Cap SBSE charge target at 480 V to preserve headroom against the 500 V ceiling.

Can SMA handle a Nissan Leaf 40 kWh pack?

Yes, via Sunny Boy Storage in the common re-configuration where Leaf modules are paralleled to 48 V. Factory-voltage Leaf packs (~350 V on 62 kWh) fit Sunny Boy Smart Energy.

Does SMA support 800 V EV batteries?

No. The highest DC ceiling on the Smart Energy series is 500 V. Porsche Taycan, Audi e-tron GT, Hyundai Ioniq 5, Kia EV6 are outside this window.

What is the difference between Sunny Boy Storage and Sunny Boy Smart Energy?

Sunny Boy Storage (SBS) is AC-coupled, 48 V LV, no PV MPPT — retrofit product. Sunny Boy Smart Energy (SBSE) is a DC-coupled hybrid with PV MPPT and HV battery (100–500 V) — new-build product.

Can I use SMA Sunny Tripower X with a battery?

Not directly — STPX has no battery port. Add a separate battery inverter (SBS or SBSE) on the AC bus.

How does SMA compare to Deye or GoodWe on price?

SMA is 30–60% more expensive per kW than equivalent Deye or GoodWe. The trade-off is EU manufacturing, longer warranty (5–20 years), and SMA's Sunny Portal cloud service.

Which grid codes does SMA support?

EN 50549, VDE-AR-N 4105, VDE 0126-1-1, CEI 0-21, G98/G99, RD 1699, and country-specific codes for most European and Australian markets. Set at commissioning via SMA Sunny Explorer or the local web UI.

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Last updated: 2026-09-18

Current firmware: 15.0.14

Technical author: BMS-EV engineering team (Clima Boost sp. z o.o., Poland)

Reviewer: Jakub Lipiński, founder/lead engineer BMS-EV

Revision: 2026-09-18 — aligned with firmware 15.0.14, SOFAR 180–800 V DC verification, Kia EV6 + SOFAR HYD 15KTL case study reference

Parameter	Value	Source
Sunny Boy Storage 3.7/5.0/6.0 EU battery voltage	100–550 V DC (360 V rated)	SMA Sunny Boy Storage EU product page
Sunny Boy Smart Energy (SBSE) battery voltage	100–500 V DC	SMA Sunny Boy Smart Energy
Sunny Tripower Smart Energy (STPSE) battery voltage	100–500 V DC	SMA Sunny Tripower Smart Energy