SMA Sunny Boy 2.5kW

The Sunny Boy Storage is the battery inverter for high-voltage batteries from important reputable manufacturers. With a charge and discharge power of 2.5 kW, it is ideally suited to coping with the electricity demand of a private household. The device combines the flexibility of the AC coupling with the advantages of high-voltage technology, enabling a significant reduction in system and installation costs. Thanks to the integrated web server and the direct portal access, commissioning is simple and the energy flows in the household are as transparent as possible. However electric current is produced and consumed – whether in existing or new PV systems, using wind energy, in CHP plants or to ensure a secure supply in the event of grid failures – the Sunny Boy Storage does it all, both today and in the future, because systems with the Sunny Boy Storage can be flexibly extended at any time on both the generator and battery sides.


  • Multiple configuration options and
  • extendable PV design
  • For new and existing systems
  • Compatible with all high-voltage
  • lithium-ion batteries


  • Most economical AC-connected system on the market
  • 97% efficiency
  • Integrated dynamic active power limitation for PV inverters


  • One-person installation
  • WLAN and intuitive web interface
  • Transparency thanks to its direct
  • connection to Sunny Portal / Sunny Places

Technical data Sunny Boy Storage 2.5
Rated power (at 230 V, 50 Hz) 2500 W
Max. apparent AC power 2500 VA
Nominal AC voltage / range 220 V, 230 V, 240 V / 180 V to 280 V
AC power frequency / range 50 Hz, 60 Hz / −5 Hz to +5 Hz
Rated power frequency / rated grid voltage 50 Hz / 230 V
Max. AC current 11:00 AM
Power factor at rated power 1
Adjustable displacement power factor 0.8 overexcited to 0.8 underexcited
Feed-in phases / connection phases 1/1
Battery DC input
Max. DC power (at cos φ =1) 2650 W
Max. DC voltage 500 V
DC voltage range / DC rated voltage 100 V to 500 V / 360 V
Min. DC voltage / start DC voltage 100 V / 100 V
Max. DC current 10 A
Max. DC short-circuit current 18 A
Battery type Li-ion*
Max. efficiency / European weighted efficiency ∼97.0% / ∼96.5%
Self-consumption with no load and battery consumption / standby ≤ 10 W / ≤ 2 W
Protective devices
Input-side disconnection point
Ground fault monitoring / grid monitoring ● / ●
DC reverse polarity protection / AC short-circuit current capability / galvanically isolated — / ● / —
All-pole-sensitive residual-current monitoring unit
Protection class (according to IEC 62103) / overvoltage category (according to IEC 60664-1) I / III
General data
Dimensions (W / H / D) 450 / 357 / 122 mm (17.7 / 14.1 / 4.8 inches)
Inverter weight 9.2 kg (20.3 lbs)
Operating temperature range in battery operation −40°C to +60°C (−40°F to +140°F)
Noise emission, typical < 25 dB
Topology Transformerless
Cooling method Convection
Degree of protection (according to IEC 60529) / climatic category (according to IEC 60721-3-4) IP65 / 4K4H
Max. permissible value for relative humidity (non-condensing) 1
DC connection / AC connection Connector/connector
Integrated web server
Interfaces Ethernet/WLAN
Communication protocols Modbus (SMA, Sunspec), Webconnect
Battery communication CAN Bus
Integrated dynamic active power limitation
Warranty: Ten years
Certificates and approvals (more available upon request) AS4777, C10/11/2012, CEI0-21, CE, G83/2, DIN EN 62109-1 /IEC 62109-1, VDE-AR-N4105
Certificates and approvals (currently being planned) NEN 50438, VFR 2014, G59/3 EN50438, RD 1699, VDE0126-1-1, PPC,NRS097, PPDS, IEC61727
Sunny Home Manager / SMA Energy Meter ○ / ○
Retrofittable battery-backup function Q4 2016
* SMA-approved batteries, e.g. Tesla Powerwall Daily, etc.
● Standard features ○ Optional features — not available
Data in nominal conditions
Technical data is subject to change; status May 2016
Type designation SBS2.5-1VL-10


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