SAJ HS3-6K-T2-W/G-PX
Description
Adding high-voltage storage without altering existing rooftop solar.
SAJ AS3-6K-S-W/G-PX is a 6 kW single-phase All-in-One AC-coupled storage retrofit unit, engineered to add modular high-voltage battery storage to existing solar installations in a slim 17 cm column without touching rooftop PV wiring.
Drop-In Single-Phase AC Storage Retrofit
Adds high-voltage battery storage to any existing single-phase solar system without altering rooftop string wiring.
6,000 VA High-Power AC Charging & Discharging
Rapidly absorbs excess solar from existing grid-tied inverters to charge storage and discharge during evening peaks.
Cable-Free Modular Tower Stacking
Mounts directly on top of SAJ BU3 battery bricks with internal busbars, preserving wall space and eliminating external DC wiring runs.
Ultra-Slim 17 cm Column Depth
Furniture-grade vertical column hugs residential garage and utility room walls closely with zero exposed wiring.
More product details
Upgrading an operating single-phase solar installation by replacing inverters requires costly DC rewiring and scaffolding. The AS3-6K-S-W/G-PX connects straight to the home's 230 V AC panel, capturing surplus solar from the AC grid.
- Connects directly to the main domestic AC panel beside existing string or micro-inverters of any manufacturer.
- Measures household grid import/export in real time via an external smart meter to maximize solar self-consumption.
- Automatically schedules charging during solar overproduction peaks and off-peak utility tariff windows.
Furniture-grade single-column integration with internal busbars.
Stacking the AS3-6K directly onto BU3-5.0-TV2-PRO battery bricks eliminates external high-voltage cables and conduit runs, providing an ultra-clean domestic aesthetic. 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 (-40 to +60 °C).
BU3 on a 380-500 V port.
Same high-voltage BU3 window as HS3, with 15.8 A charge and 16.8 A discharge on this 6 kW head.
6 kW single-phase backup.
Backup power matches the AC rating when the grid is gone, without converting the site to a hybrid MPPT head.
Technical data
Furniture-grade energy storage retrofit engineered for existing single-phase solar installations.
6 kW AC-coupled storage retrofit unit for modular single-phase domestic systems.
Purpose-built to add high-performance battery storage to existing grid-tied solar systems, the AS3-6K-S-W/G-PX connects directly to the home's AC bus without rewiring existing PV strings or replacing existing inverters. It stacks cleanly onto modular 5 kWh BU3 battery bricks, delivering 6 kW of dynamic storage charge and discharge power in an ultra-lean 17 cm deep footprint.
- Bidirectional AC Power
- 6,000 VA
- High-Voltage Battery Bus
- 180–600 V
- Rooftop DC Rewiring
- Zero
- Ultra-Slim Depth
- 170 mm
PCS: AC Output/Input (On-Grid)
- Rated AC power / max. apparent power
- 6 kW / 6 kVA (AS3-6K-S-W/G-PXthe -IE Ireland variant is 5750 W/VA). Single-phase family: 3K / 3.6K / 4K / 4.6K / 5K / 6K
- Rated / max. output current
- 26.1 A / 26.1 A @230 Vac
- Max. AC input current
- 54.5 A @230 Vac
- Rated AC voltage / frequency
- L+N+PE, 220/230/240 V (range 180–280 V); 50/60 Hz
- Power factor / THDi
- 0.8 leading – 0.8 lagging; THDi < 3%
- Max. efficiency
- 97.6% (no Euro-efficiency figure published on the EU datasheet)
Battery
- Battery type / voltage range
- LiFePO4; 380–500 V
- Max. charging / discharging current
- 15.8 A / 16.8 A (AS3-6K-S-W/G-PX)
- Scalability
- BU3-5.0-TV1/TV2-PRO packs, up to 8 battery modules per inverter (SAJ quotes a 5–40 kWh AS3-series capacity range)
- Multi-stack expansion
- Up to 4 packs per ground-mounted stack (3 wall-mounted)additional stacks connect via the BC3-TV battery junction box
Backup Output
- Rated backup output power
- 6 kW (AS3-6K-S-W/G-PX)
- Peak backup output apparent power
- 7.2 kVA for 60 s
- Backup voltage / frequency / THDv
- L+N+PE, 220/230/240 V50/60 Hz · THDv < 3% at linear load (no switchover-time figure is published on the EU datasheet)
EV Charger Module (optional, stack-on)
- Model
- CU2-7.4K-S-I charger module (per the AS3 single-phase user manual)
- Output
- 7 kW rated, 230 V ±20%, max. 32 A; standby consumption 7 W
- Dimensions / weight
- 160 × 695 × 170 mm (H×W×D)9 kg · -30 °C to +50 °C working range
General / Enclosure & Communication
- Ingress protection / cooling / noise
- IP65; natural convection; < 35 dBA
- Operating temperature / humidity / altitude
- -30 °C to +50 °C; 0–100% non-condensing; max. 3000 m
- Topology
- Non-isolated
- Dimensions / weight
- Inverter 400 × 695 × 170 mm, 27.5 kgbattery with base 420 × 695 × 170 mm, 53 kg
- Communication
- Wi-Fi / Ethernet / 4G (optional): the 'W' models have a built-in AIO3 communication module, the 'G' models a built-in 4G module with SIM slot
- Metering / sensing
- 2 × current transformers included (10 m cable each): grid-side CT required, PV-inverter-side CT optional for AC-couplingan external smart meter connection is optional
Project fit
Where this model fits.
Scenarios that show which projects the SAJ AS3-6K-S-W/G-PX (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 Existing Solar Adding Storage (5–10 kWh)
Homes with an existing single-phase string or microinverter solar array seeking a sleek, furniture-grade battery storage retrofit.
Drops straight into the AC panel, stacking neatly over 1 to 3 BU3 battery bricks (5.0 to 15.0 kWh) in a 17 cm slim column.
What Linker confirms with you
- Confirm this model against the adjacent rating in the same family
Documents
SAJ AS3 Series (5K-6K) S Datasheet (EN, BEU)Product questions
Does the AS3-6K-S-W/G-PX have any DC solar panel inputs?
No. It is a pure AC-coupled battery retrofit unit. The AS3-6K-S-W/G-PX has zero MPPT or DC solar inputs. It is dedicated entirely to charging and discharging high-voltage battery storage (BU3 modules) from the home's 230 V AC grid. If you need solar PV string inputs on the same inverter, choose a hybrid inverter from the SAJ HS3 or HS2 series.
What battery modules are compatible with this AC-coupled model?
Exclusively compatible with SAJ BU3-5.0-TV2-PRO modular battery bricks. The AS3 series is an integrated All-in-One architecture that stacks directly onto 1 to 5 SAJ BU3-5.0-TV2-PRO (5.0 kWh) battery modules (scaling from 5.0 kWh up to 25.0 kWh) using internal slide-and-lock busbar connectors.
System components
Required components
SAJ BU3-5.0-TV2-PRO battery pack
Item number: DLK-SAJ-BU350TV2PRO
The AS3 inverter is the PCS/backup/EMS layer, storage comes from stackable BU3-5.0 packs (1–8 per inverter). At least one pack completes a working storage system.
Recommended components
Additional SAJ BU3-5.0-TV2-PRO packs
Item number: DLK-SAJ-BU350TV2PRO
Expand to up to 8 modules (~40 kWh) as household demand or an EV arrives; beyond one stack, the BC3-TV junction box connects further stacks.
Optional components
SAJ eManager
Item number: DLK-SAJ-EMANAGER
Adds heat-pump linkage, generation metering and deeper tariff-based scheduling on top of the built-in elekeeper EMS, for households that want whole-home energy control.
SAJ Smart Wi-Fi Plug
Item number: DLK-SAJ-SAJ-SMART-PLUG
Lets the EMS shift individual appliance loads into surplus-solar windows, a low-cost self-consumption upgrade for the retrofit story.
Approved pairings
BU3-5.0-TV2-PRO modules, 1 to 8 per inverter, but a single stack holds only 4 ground-mounted / 3 wall-mounted (AS3 manual p33) - 8 modules means two or three stacks. The AS3 has NO PV input: it is AC-coupled storage beside an existing solar inverter.