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SAJ AS3-6K-S (6 kW single-phase AI 6-in-1 all-in-one)
SAJ Hybrid Inverter

SAJ AS3-6K-S (6 kW single-phase AI 6-in-1 all-in-one)

SAJ's AC-coupled 'Skinny 6-in-1' for retrofits: the AS3-6K-S adds a 6 kW battery PCS, stackable 5 kWh LFP packs, a backup output, EMS and an optional 7 kW EV-charger module to an existing single-phase PV system — one 17 cm-thin blind-mate stack, no DC-side rework.

  • AC-coupled retrofit: adds storage and backup alongside the existing PV inverter — grid- and PV-side CTs included
  • 6 kW PCS with stackable BU3-5.0 packs: 1–8 modules per inverter, roughly 5–40 kWh
  • Backup output 6 kW with 7,200 VA / 60 s peak; optional stack-on 7 kW EV-charger module
  • VDE-AR-N 4105 listed · German PV-wholesale stock · request a quote
single-phase
Phase
Manufacturer
SAJ
Model code
AS3-6K-S-W-PX
Item no.
DLK-SAJ-AS3-6K
Delivery
Delivery included in your Proforma
Orderable · lead time confirmed after order

Plan with AS3-6K-S-W-PX

New system, extension or replacement? Linker Advisor starts from this article and asks only for what is still open — existing model, quantity, postcode, installation date.

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Required to install — not in the box
SAJ BU3-5.0-TV2-PRO 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.
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Figures transcribed from the manufacturer datasheet on file. Confirm your grid code and configuration with our engineers before ordering.

  • GoodWe · SAJ · Pylontech · EcoFlow · Chint paired from the maker’s own lists
  • Datasheets on file for every item
  • Within 24 h engineering response
  • MOQ 1 unit · EU delivery
  • Engineering-checked configurations
Store sun. Sell peak.
System logic

Store sun. Sell peak.

Charge through solar noon, discharge into evening tariffs - shifted on your tariff schedule.

AC-coupled retrofit: adds storage and backup alongside the existing PV inverter — grid- and PV-side CTs included
6 kW PCS with stackable BU3-5.0 packs: 1–8 modules per inverter, roughly 5–40 kWh
Backup output 6 kW with 7,200 VA / 60 s peak; optional stack-on 7 kW EV-charger module
In pictures

Inspect it before you spec it.

Official renders, installation photos and system panels for this model line.

Official manufacturer product render
Product

Official manufacturer product render

Documentation

Specifications

Every value exactly as published in the official AS3-6K-S-W-PX documentation.

Rated AC power / max. apparent power6000 W / 6000 VA (AS3-6K-Sthe -IE Ireland variant is 5750 W/VA). Single-phase family: 3K / 3.6K / 4K / 4.6K / 5K / 6K
Rated / max. output current26.1 A / 26.1 A @230 Vac
Max. AC input current54.5 A @230 Vac
Rated AC voltage / frequencyL+N+PE, 220/230/240 V (range 180–280 V); 50/60 Hz
Power factor / THDi0.8 leading – 0.8 lagging; THDi < 3%
Max. efficiency97.6% (no Euro-efficiency figure published on the EU datasheet)
Battery type / voltage rangeLiFePO4; 380–500 V
Max. charging / discharging current15.8 A / 16.8 A (AS3-6K-S)
ScalabilityBU3-5.0-TV1/TV2-PRO packs, up to 8 battery modules per inverter (SAJ quotes a 5–40 kWh AS3-series capacity range)
Multi-stack expansionUp to 4 packs per ground-mounted stack (3 wall-mounted)additional stacks connect via the BC3-TV battery junction box
Rated backup output power6000 W (AS3-6K-S)
Peak backup output apparent power7200 VA for 60 s
Backup voltage / frequency / THDvL+N+PE, 220/230/240 V50/60 Hz · THDv < 3% at linear load (no switchover-time figure is published on the EU datasheet)
ModelCU2-7.4K-S-I charger module (per the AS3 single-phase user manual)
Output7 kW rated, 230 V ±20%, max. 32 A; standby consumption 7 W
Dimensions / weight160 × 695 × 170 mm (H×W×D)9 kg · -30 °C to +50 °C working range
Ingress protection / cooling / noiseIP65; natural convection; < 35 dBA
Operating temperature / humidity / altitude-30 °C to +50 °C; 0–100% non-condensing; max. 3000 m
TopologyNon-isolated
Dimensions / weightInverter 400 × 695 × 170 mm, 27.5 kgbattery with base 420 × 695 × 170 mm, 53 kg
CommunicationWi-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 / sensing2 × 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
Full datasheet (PDF) Ask an engineer
ProductSAJ AS3-6K-S (6 kW single-phase AI 6-in-1 all-in-one)

Complete the system

Balance-of-system and accessories paired with this model. Every pairing follows the manufacturer's official compatibility list.

Required
SAJ BU3-5.0-TV2-PRO battery pack
[1]

SAJ BU3-5.0-TV2-PRO battery pack

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.
View product →
Recommended
Optional
SAJ eManager
[1]

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.
View product →
SAJ Smart Wi-Fi Plug
[2]

SAJ Smart Wi-Fi Plug

Lets the EMS shift individual appliance loads into surplus-solar windows — a low-cost self-consumption upgrade for the retrofit story.
View product →

Availability & compliance 1

Yes, the EU datasheet's standards row includes VDE-AR-N 4105 for Germany, alongside several other grid codes.

  • Standards: VDE-AR-N 4105 and VDE 0126-1-1 (Germany), EN 62109-1/2, EN 50438, EN 50549, IEC 62116, IEC 61727, plus country codes CEI 0-16/0-21, AS 4777.2, NBR 16149, RD 1699/RD 413, UNE 206006/206007
  • The battery side is promoted with self-heating and an internal fire-protection system; an IEC 62619 listing is not shown on this datasheet, so do not quote it
  • As a grid-connected storage system it is registered in the Marktstammdatenregister as usual; confirm the current certificate revision at quote

Configuration 4

The AS3 sits on the AC side, measuring the house and existing PV inverter via supplied CTs, so no DC-side rework is needed.

  • Measures via two supplied CTs: a required grid-side CT and an optional CT on the solar-inverter side, each with a 10 m cable
  • Charges the battery from surplus AC power. No DC-side rework, no restringing, existing PV inverter stays in place; SAJ's retrofit path for homes that already have solar
  • Phase: single-phase unit (L+N+PE, 220/230/240 V), match to a single-phase supply or one phase of a three-phase home, and verify metering topology on site
  • For unusual existing-inverter constellations, ask us to confirm compatibility with SAJ before ordering

One AS3 inverter supports 1 to 8 BU3-5.0 battery modules, arranged in stacks with a defined layout.

  • Modules: 1 to 8 BU3-5.0 (LiFePO4, pack-level DC/DC optimiser); SAJ quotes 5-40 kWh for the AS3 series
  • Per stack: up to 4 modules ground-mounted (3 per wall-mounted stack)
  • Beyond one stack, additional stacks connect through the BC3-TV battery junction box, with stacks placed within about 0.5 m of each other due to cable lengths
  • SAJ recommends expanding with same-configuration packs in parallel
  • Battery voltage window at the PCS: 380-500 V

It has a dedicated backup output for essential circuits, though no switchover time is published for this model.

  • Backup output: 6,000 W continuous with a 7,200 VA peak for 60 seconds, enough headroom for compressor and motor starts on essential circuits
  • Backup-load circuit is fed separately from the grid connection (backup and grid connectors are separate plug-in kits)
  • The EU datasheet does not publish a grid-to-backup switchover time for the AS3, so do not promise a UPS-grade millisecond figure; if seamless whole-home transfer is the requirement, look at the EK90 HS5 hybrid line instead

Yes, the single-phase AS3 takes an optional stack-on charger module.

  • Module: CU2-7.4K-S-I, 7 kW rated at 230 V, max. 32 A
  • Mounted on top of the battery stack and managed in the elekeeper ecosystem alongside PV, storage and household loads
  • Dimensions/weight: 160 x 695 x 170 mm, 9 kg, 7 W standby consumption
  • It is an optional package in the system configuration, name it in your RFQ if the project needs it

Operation & warranty 1

No extra dongle is needed, communication is built in, differing only by model suffix.

  • 'W' models ship with a built-in AIO3 communication module (Wi-Fi/Ethernet/Bluetooth)
  • 'G' models ship with a built-in 4G module and SIM slot for sites without usable home internet
  • Commissioning and monitoring run through the elekeeper App (One-Click Savings, One-Click Diagnosis, scheduling, energy trading)
  • Warranty: SAJ's AS3 documents refer to the SAJ warranty policy rather than publishing retention figures; request the warranty document with your quote and pass its exact terms to the end customer
Next step

Send the project. Hear from an engineer within 24 hours.

Loads, tariff, site constraints - our engineers reply with a compatibility check and a sizing recommendation.

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