Sunny Boy Smart Energy — 3.6–9.9 kW single-phase hybrid inverter

Country: Germany · Model: Sunny Boy Smart Energy

The Sunny Boy Smart Energy single-phase hybrid inverter comes in 3.6, 4.0, 5.0 and 6.0 kVA, with 8.0 and 9.9 versions sold only in Italy. Up to 5 Home Storage modules with a total of 16.4 kWh connect to it, and it is meant for private homes with a single-phase supply.

Models: 3.6 / 4.0 / 5.0 / 6.0 kVA; 8.0 / 9.9 (Italy only)
MPPT: 3 (4 on 8.0 and 9.9)
Battery: up to 5 Home Storage modules, 16.4 kWh
Backup socket: 16 A / 230 V, up to 3,680 W

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Technical specifications

More from the manufacturer’s documentation
Models	3.6 / 4.0 / 5.0 / 6.0 kVA; 8.0 / 9.9 (Italy only)
MPPT	3 (4 on 8.0 and 9.9)
Battery	up to 5 Home Storage modules, 16.4 kWh
Backup socket	16 A / 230 V, up to 3,680 W
Full backup	Backup 1P / 3P Kit
Max. PV array power	7,200 Wp (3.6), 8,000 Wp (4.0), 10,000 Wp (5.0), 12,000 Wp (6.0)
Max. input voltage	600 V
MPP voltage range	60–480 V
Min. / start voltage	60 / 66 V
Max. input current	15 A per input (sum of all inputs max. 66 A)
Battery	lithium-ion, 90–500 V; charge / discharge 30 / 30 A; 1 input
Rated AC power	3,600 / 4,000 / 5,000 / 6,000 W; 4,600 W for 5.0 and 6.0 per VDE-AR-N 4105
Nominal AC voltage	230 / 240 V; range 184–253 V
Grid frequency	50 / 60 Hz (44–66 Hz)
Max. output current	16 A (3.6) to 30 A (6.0)
Power factor	1; adjustable 0 overexcited to 0 underexcited
Max. / European efficiency	97.8 / 96.6% (3.6) to 98.0 / 97.5% (6.0)
Power with Backup 1P	7,300 W; 11,040 W and 9,200 W short-term; automatic switching
Dimensions (W × H × D)	500 × 586 × 236 mm
Weight	17.5 kg
Operating temperature	−25 °C to +60 °C with derating
Noise emission	35 dB(A)
Self-consumption at night	6 W
Topology / cooling	transformerless / natural convection
Degree of protection / climatic category	IP65 / 4K26
Relative humidity	up to 100% non-condensing
Protocols	Modbus (, SunSpec), Modbus RTU, Speedwire/Webconnect, Battery Interface
Digital inputs / output	2 inputs; SG Ready output (relay 30 V DC / 1 A)
Warranty	5 years; 10 years with registration within 12 months
Standards	VDE-AR-N 4105, EN 50549-1, IEC 62109-1/-2, TED749, CEI 0-21, C10/11, AS4777-2
Cybersecurity	EN 18031-1 (RED), ETSI EN 303 645, Speedwire Encrypted Communication (SEC), EU data hosting (ISO 27001)
Customs codes (for reference)
HS code	8504.40
UKTZED code (Ukraine)	8504408400 (≤7.5 kVA); 8504408800 (>7.5 kVA)
CN code (EU)	85044084

Specifications are taken from the manufacturer’s technical documentation. Updated 10/31/2026. Customs codes are for reference only; the final code is determined at customs declaration for the specific model.

Description

The inverter has 3 MPPT inputs, the 8.0 and 9.9 versions have 4, and each input accepts up to 15 A. The MPP range is 60–480 V with a 66 V start and a 600 V maximum, so short east and west strings start producing early in the morning. The battery input takes 90–500 V lithium-ion packs at 30 A. During a grid outage, selected loads run from a 16 A / 230 V backup socket rated up to 3,680 W. Whole-home backup needs a Backup 1P or 3P Kit unit, and with Backup 1P the system carries 7,300 W continuously and 9,200 and 11,040 W for short periods, with automatic transfer. The inverter weighs 17.5 kg, is cooled by natural convection, runs at 35 dB(A) and draws 6 W at night. The IP65, 4K26 housing hangs indoors or outside, derating in heat within its −25 °C to +60 °C limit. An SG Ready relay output (30 V DC / 1 A) starts a heat pump on solar surplus.

How to choose

Size it by the array, with the 3.6 taking up to 7,200 Wp, the 4.0 up to 8,000, the 5.0 up to 10,000 and the 6.0 up to 12,000 Wp. In Germany, VDE-AR-N 4105 caps the 5.0 and 6.0 at 4,600 W of feed-in. If no battery is needed, the grid-tied Sunny Boy 3.0–6.0 covers the same power range. A house with a three-phase supply suits the Sunny Tripower 3.0–10.0, and an off-grid system on lead-acid batteries calls for the Sunny Island 6.0H / 8.0H.