SAJ EK90 HS5-5K-S3-X (5 kW single-phase all-in-one)
Description
3-pitch solar tracking on a single-phase residential inverter.
SAJ EK90 HS5-6K-S3-X is a 6 kW single-phase All-in-One modular hybrid inverter unit delivering 6,600 VA maximum apparent power and 12 kWp solar intake across 3 independent 16 A MPPT channels, engineered to stack cable-free atop 314 Ah BU5 battery bricks.
3 Independent 16 A MPPT Trackers
Industry-first 3-MPPT single-phase residential inverter, eliminating string mismatch across complex multi-pitch roofs.
12,000 Wp Solar PV Intake (200% Ratio)
Double solar intake ensures rapid battery charging and daytime domestic self-consumption even on overcast winter days.
Direct Cable-Free BU5 Stacking
Mates power and communication lines directly through internal busbars with zero exposed high-voltage DC conduit.
Sub-10 ms Seamless UPS Backup
Built-in automated transfer switch keeps critical home electronics and heating controls online during outages.
More product details
Most single-phase residential inverters feature only 2 MPPTs, forcing installers to compromise string design or install expensive DC optimizers on 3-pitch roofs. The HS5-6K provides 3 independent 16 A MPPT channels (Isc 20 A).
- 3 MPPT channels allow dedicated tracking for East, South, and West domestic roof planes with zero cross-string clipping.
- Wide MPPT operating window (100–550 V) optimizes harvest across extreme temperature swings.
- 200% DC oversizing channels surplus daytime generation directly into high-voltage BU5 storage.
SAJ HS5
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4 models
Rated AC power
6 kW
5 kW
8 kW
10 kW
Phase
Single-phase
Single-phase
Single-phase
Single-phase
MPPT trackers
3
3
3
4
Max. efficiency
98.0 %
98.0 %
98.0 %
98.0 %
Battery voltage
350-600 V
350-600 V
350-600 V
350-600 V
Ingress protection
IP66
IP66
IP66
IP66
Weight
Inverter: 39.5; Battery pack:BU5-6.0-TV: 60.4; BU5-7.0-TV: 68; BU5-9.0-TV: 79.2; Battery base: 8 kg
Inverter: 39.5; Battery pack:BU5-6.0-TV: 60.4; BU5-7.0-TV: 68; BU5-9.0-TV: 79.2; Battery base: 8 kg
Inverter: 39.5; Battery pack:BU5-6.0-TV: 60.4; BU5-7.0-TV: 68; BU5-9.0-TV: 79.2; Battery base: 8 kg
Inverter: 39.5; Battery pack:BU5-6.0-TV: 60.4; BU5-7.0-TV: 68; BU5-9.0-TV: 79.2; Battery base: 8 kg
Dimensions
Inverter: 835 / 350 / 270; Battery pack: 835 / 270 / 270; Battery base: 835 / 70 - 80 / 270 mm
Inverter: 835 / 350 / 270; Battery pack: 835 / 270 / 270; Battery base: 835 / 70 - 80 / 270 mm
Inverter: 835 / 350 / 270; Battery pack: 835 / 270 / 270; Battery base: 835 / 70 - 80 / 270 mm
Inverter: 835 / 350 / 270; Battery pack: 835 / 270 / 270; Battery base: 835 / 70 - 80 / 270 mm
Furniture-grade single-column integration with internal busbars.
Stacking directly on top of BU5-6.0 / 7.0 / 9.0 kWh battery modules eliminates external high-voltage conduits, junction boxes, and messy communication patch leads. Internal push-in busbars pass high-voltage power and communication directly between inverter and battery modules. Eliminates exposed high-voltage DC wiring on garage and utility room walls, maximizing residential safety. IP65 cast-aluminum casing certified for clean indoor utility rooms or sheltered outdoor walls (-10 to +50 °C).
3 MPPTs at 600 V
3 trackers take the string plan on this S3 head. Maximum PV voltage stays at 600 V on single-phase HS5
BU5 stack under the head
1 to 6 blind-mate packs, 6 to 54 kWh family range. No cable battery interface to another brand
Technical data
Furniture-grade residential energy management engineered for electrified single-phase homes with heat pumps.
3 independent MPPT trackers with 12 kWp solar intake in a 6 kW single-phase tower.
Sized for high-consumption single-phase homes, the EK90 HS5-6K-S3-X accepts up to 12,000 Wp of rooftop solar across 3 distinct roof aspects. It delivers 6,600 VA maximum apparent power, stacking directly on 314 Ah BU5 modular battery bricks (6.0 to 27.0 kWh) to power domestic heat pumps and domestic EV chargers with sub-10 ms UPS backup.
- Single-Phase Power
- 6,000 VA
- 200% Solar DC Intake
- 12,000 Wp
- Multi-Pitch Routing
- 3 MPPTs
- External DC Conduits
- Zero
Inverter: AC Output (On-Grid)
- Rated output power
- 6 kW
- Rated / max. apparent power
- 6 / 6.6 kVA
- Rated / max. output current
- 26.1 A / 28.7 A
- Phase / rated output voltage
- Single-phase, L+N+PE; 220, 230, 240 V
- Rated AC grid frequency
- 50/60 Hz
- Max. AC input current
- 63 A, the built-in 63 A bypass enables whole-house backupcurrent configurable in the elekeeper App
- Adjustable power factor
- 0.8 leading – 0.8 lagging
- Total current harmonic distortion
- THDi < 3%
Inverter: PV Input & Efficiency
- Recommended max. PV power
- 12 kWp
- Max. input voltage
- 600 V
- MPPT voltage range
- 50–550 V (operating range 50–600 V)
- Start-up / nominal DC input voltage
- 80 V / 360 V
- Max. input current per MPPT
- 20 A (25 A max. short-circuit)
- Number of MPP trackers / strings
- 3 MPPT, strings 1+1+1 (5K–8K: 3 MPPTthe 10 kW unit is the -S4- version with 4 MPPT)
- Max. efficiency
- 98.0%
- Euro (EU) efficiency
- 97.6%
Battery (EK90 BU5 HV packs)
- Battery / cell chemistry
- LiFePO4 (LFP), 314 Ah cell
- Module (pack) models & energy
- EK90 BU5-6.0-TV = 6 kWhBU5-7.0-TV = 7 kWh · BU5-9.0-TV = 9 kWh (usable = total, 100% depth of discharge)
- Stackable capacity per system
- Up to 6 battery packsconfigurable system energy X = 6/7/9/12/14/15/16/18/21/24/25/27/28/30/35/36/40/42/45/50/54 kWh
- Rated pack voltage / system battery voltage range
- 390 V per BU5 pack (each with built-in DC-DC optimizer)system battery voltage range 300–600 V
- Max. charge/discharge power per pack
- BU5-6.0-TV = 3 kW; BU5-7.0-TV = 3.5 kW; BU5-9.0-TV = 4.6 kW
- Max. charge/discharge current per pack
- BU5-6.0-TV = 7.7 A; BU5-7.0-TV = 9.0 A; BU5-9.0-TV = 11.8 A
- Cycle life
- 10,000 cycles (user manual, provided by the battery manufacturer, 25±2°C)the datasheet marketing highlight states 12,000 cycles (0.2C, to 60% SOH, lab conditions)
- Battery communication interface
- CAN
- Warranty
- Per SAJ warranty policy (datasheet and manual state 'refer to the warranty policy'no retention figure published for this model)
Backup / Off-Grid Output
- Max. backup output apparent power
- 6 kVA
- Max. backup output current
- 26.1 A
- Peak backup output apparent power
- 12 kVA for 10 s
- Switchover time (grid-to-backup)
- ≤ 10 ms
- Whole-house backup path
- Built-in 63 A bypass (no backup retrofit box required)alternatively SAJ's manual specifies a Lazzen NDQ2S-63/1P manual transfer switch for the whole-home backup topology, plus a partial-backup wiring option
General / Enclosure & Communication
- Ingress protection (IP)
- IP66
- Operating temperature range
- -30 °C to +50 °C (charging/discharging)relative humidity 5–95% non-condensing
- Cooling
- Smart air cooling (inverter) with heating function for low-temperature operationbattery packs natural convection
- Dimensions (W × H × D)
- Inverter: 835 × 350 × 270 mmbattery pack: 835 × 270 × 270 mm · battery base: 835 × 70–80 × 270 mm
- Weight
- Inverter: 39.5 kgbattery packs: BU5-6.0-TV 60.4 kg, BU5-7.0-TV 68 kg, BU5-9.0-TV 79.2 kg · battery base: 8 kg
- Corrosion resistance / altitude / class
- C4max. 3000 m · protective class I · overvoltage category DC II / AC III · non-isolated (transformerless) topology
- Communication
- WLAN / Fast Ethernet / RS485communication module eSolar AIO3 Pro or eSolar 4G Pro
- Metering
- Dual-channel Wireless-pro LoRa meter (wiring-free, optimal range 150 m penetrating walls)wired RS485 meter connections also supported
Project fit
Where this model fits.
Scenarios that show which projects the SAJ EK90 HS5-6K-S3-X (6 kW single-phase all-in-one) belongs in, what to verify before quoting, and when another model is the better pick.
Project scenario
Single-Phase Residences with 3 Roof Pitches & Heat Pump (8–12 kWp PV)
Single-phase homes running a modulating heat pump across multiple roof orientations.
6 kW AC power delivers the extra electrical headroom needed for heat pump compressor cycles, while 3 MPPTs eliminate external optimizers.
- BoundaryIf local grid connection rules permit higher single-phase export (up to 32 A / 40 A) and the home runs an EV charger alongside the heat pump, step up to the HS5-8K or HS5-10K. ---
What Linker confirms with you
- If local grid connection rules permit higher single-phase export (up to 32 A / 40 A) and the home runs an EV charger alongside the heat pump, step up to the HS5-8K or HS5-10K. ---
Documents
SAJ EK90 HS5 Single-Phase Datasheet (EU)Product questions
What size AC circuit breaker is required for the HS5-6K-S3-X?
32 A 1-pole MCB; 3 × 6 mm² copper cable. The HS5-6K-S3-X delivers a nominal continuous output current of 26.1 A (max output current 27.3 A @ 230 V). A 1-pole 32 A miniature circuit breaker (MCB) is standard on the AC distribution board.
System components
Required components
SAJ eSolar Wireless-pro Meter
Item number: DLK-SAJ-ESOLAR-WIRELESS-PRO-METER
The inverter needs grid-point metering to see import/export in real time, this enables self-consumption optimisation and export limiting. The EK90 system is built around SAJ's dual-channel wireless LoRa meter: wiring-free, optimal range 150 m through walls
Recommended components
SAJ eSolar AIO3 data collector
Item number: DLK-SAJ-ESOLAR-AIO3
Cloud/app gateway for remote monitoring, AI Care health checks, firmware updates and remote commissioning: SAJ's documents list the eSolar AIO3 Pro / 4G Pro as the system's communication modules
SAJ EK90 BU5-6.0 / 7.0 / 9.0-TV battery packs
Item number: DLK-SAJ-EK90-BU5-6-0-TV
Storage scales purely by stacking packs, up to 6 per system (6–54 kWh), each with its own DC-DC optimizer, so capacity can be added later without dragging down the existing stack
Optional components
SAJ ATS 63 A transfer panel (ATS1-T63-A)
Item number: DLK-SAJ-ATS1T63A
Automatic grid/backup changeover (63 A, automatic/manual modes) for hands-off whole-home backup instead of the manual transfer-switch topology in SAJ's manual, confirm the phase variant for a single-phase site when quoting
SAJ eManager
Item number: DLK-SAJ-EMANAGER
Extends the elekeeper ecosystem with heat-pump linkage, generation metering and deeper tariff-based load scheduling beyond the standard meter, optional, not required for a basic PV+storage install
SAJ Smart Wi-Fi Plug
Item number: DLK-SAJ-SAJ-SMART-PLUG
Lets the AI energy manager shift individual appliance loads into surplus-solar or cheap-tariff windows, a low-cost way to raise self-consumption
Approved pairings
SAJ EK90 BU5-6.0-TV battery pack (6 kWh, 314 Ah LFP)Item number DLK-SAJ-EK90-BU5-6-0-TVBlind-mate stacking only: 1 to 6 BU5 packs (6/7/9 kWh, 100% DoD) under the HS5 unit. SAJ defers pack-combination rules to a battery combination datasheet that its Download Center does not carry, so the 21 permitted size combinations are undocumented - quote conservatively.
SAJ EK90 BU5-7.0-TV battery pack (7 kWh, 314 Ah LFP)Item number DLK-SAJ-EK90-BU5-7-0-TVBlind-mate stacking only: 1 to 6 BU5 packs (6/7/9 kWh, 100% DoD) under the HS5 unit. SAJ defers pack-combination rules to a battery combination datasheet that its Download Center does not carry, so the 21 permitted size combinations are undocumented - quote conservatively.
SAJ EK90 BU5-9.0-TV battery pack (9 kWh, 314 Ah LFP)Item number DLK-SAJ-EK90-BU5-9-0-TVBlind-mate stacking only: 1 to 6 BU5 packs (6/7/9 kWh, 100% DoD) under the HS5 unit. SAJ defers pack-combination rules to a battery combination datasheet that its Download Center does not carry, so the 21 permitted size combinations are undocumented - quote conservatively.
