SAJ B2-20.0-HV1
Description
Operating at the upper ceiling of residential high-voltage inverters.
SAJ B2-25.0-HV1 is the flagship 25.0 kWh high-voltage LFP battery tower delivering 512 V nominal operating voltage across five stacked 5 kWh modules, engineered for maximum single-column energy density and complete all-electric residential autonomy.
512 V Maximum Single-Stack Operating Voltage
Operates at the upper ceiling of residential inverters (448–576 V), delivering peak electrical efficiency.
22.50 kWh Usable Storage Reserve
Maximum single-column capacity sustains whole-home heating, cooking, and domestic loads through multi-day blackouts.
Compact Single-Column Footprint (0.23 m²)
Consolidates 25.0 kWh into a single vertical stack without occupying multiple floor spaces.
Cable-Free Modular Assembly
Internal self-aligning busbars connect power and communication lines automatically with zero external DC wiring.
More product details
Stacking 5 modules pushes string voltage to 512 V nominal (448–576 V working window), placing the hybrid inverter in its lowest-stress, highest-efficiency conversion state with minimal step-up voltage boosting.
- 160S series LFP cell string delivers maximum round-trip electrical efficiency across summer and winter cycles.
- Low operating current minimizes internal $I^2R$ resistive heating, extending calendar life past 15 years.
- Real-time master BMS balancing maintains uniform voltage and state-of-charge across all 5 stacked modules.
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4 models
Usable energy
24 kWh
9.6 kWh
14.4 kWh
19.2 kWh
Nominal energy
25.0 kWh
10.0 kWh
15.0 kWh
20.0 kWh
Nominal voltage
512 V
204.8 V
307.2 V
409.6 V
Max. charge current
30 A
30 A
30 A
30 A
Max. discharge current
30 A
30 A
30 A
30 A
Ingress protection
IP65
IP65
IP65
IP65
Weight
252.5 kg
101 kg
151.5 kg
202 kg
25.0 kWh capacity consolidated in a single vertical footprint.
Standing 1.57 m tall on its heavy-duty base pedestal, this 5-module tower delivers extreme volumetric energy density while remaining securely anchored against the wall. Internal busbar contacts eliminate 5 separate sets of external high-voltage cables and conduit runs. Integrated wall-anchoring bracket provides certified seismic and mechanical stability for the full 263.5 kg stack. IP65 rated enclosure certified for unheated basements, technical utility rooms, and sheltered outdoor alcoves (-10 to +50 °C).
H2-listed battery path.
H2 + BC2 + B2/BU2 is the pairing SAJ lists; HS3 + B2 stays closed.
15.4 kW rated at 30 A.
Rated power scales with the full stack while current stays at 30 A charge and discharge.
Technical data
The ultimate single-column residential storage flagship for complete multi-season energy independence.
512 V maximum 5-module vertical capacity for complete all-electric residential autonomy.
Maxing out the B2-HV1 single-column configuration, this 25.0 kWh tower stacks five 5.0 kWh LFP bricks to reach 512 V nominal. It delivers maximum energy density per square meter of floor space, allowing large detached homes, estates, and small commercial workshops to power heavy domestic baselines, geothermal heat pumps, and electric vehicles completely off-grid across all four seasons.
- Nominal Storage
- 25.0 kWh
- Peak Operating Voltage
- 512.0 V
- Continuous Current
- 30 A
- Minimal Footprint
- 0.23 m²
Type & Configuration
- Type
- High-voltage residential battery system, B2 Series (HV1)
- Battery module
- BU2-5.0-HV1 (32S1P, 102.4 V / 50 Ah)
- Control module
- BC2-HV1
- Control module dimension (H x W x D mm)
- 220 x 626 x 365
- Control module weight (kg)
- 11
Energy & Electrical
- Number of modules
- 5
- Rated energy (kWh)
- 25.0
- Usable energy (kWh)
- 24
- Rated power (W)
- 15360
- Nominal voltage (V)
- 512
- Operating voltage (V)
- 448 - 576.0
- Max. charge current (A)
- 30
- Max. discharge current (A)
- 30
Mechanical
- Module stack dimension (H x W x D mm)
- 1305 x 626 x 365
- Module stack weight (kg)
- 252.5
- Control module dimension (H x W x D mm)
- 220 x 626 x 365
- Control module weight (kg)
- 11
Environment
- Ingress protection
- IP65
- Protection class
- I
- Mounting
- Wall-mounted (optional) / ground-mounted
- Operating temperature range
- Charging 0 ~ 50 C; discharging -10 ~ 50 C
- Ambient humidity
- 0 ~ 95% non-condensing
- Cooling method
- Natural convection
- Communication
- CAN
Project fit
Where this model fits.
Scenarios that show which projects the SAJ B2-25.0-HV1 belongs in, what to verify before quoting, and when another model is the better pick.
Project scenario
Large All-Electric Detached Residences (16–25 kWp Solar Arrays)
Luxury single-family homes with heavy consumption (geothermal or air-to-water heat pumps, induction hobs, home automation, and domestic EV charging).
22.50 kWh usable capacity provides the depth needed to achieve 90%+ annual solar self-consumption, buffering high daytime solar yields to cover heavy evening heating and cooking baselines.
- BoundaryIf household overnight baseline is under 12 kWh and the property does not use large heat pump space heating, step down to save capital expenditure. ---
What Linker confirms with you
- If household overnight baseline is under 12 kWh and the property does not use large heat pump space heating, step down to save capital expenditure. ---
Documents
SAJ B2 HV1 / HV5 Series high-voltage battery datasheet (AU, EN) SAJ B2 Series (5.0-25.0) HV1/HV5 Battery Datasheet (EN, AU)Product questions
Can I add a 6th battery module to this tower to reach 30 kWh?
No. Maximum 5 modules (25.0 kWh) per single tower. The physical height, structural stability, and electrical voltage ceiling (576 V DC max) of the BC2 base limit each column to 5 modules maximum. To expand beyond 25.0 kWh, you must install a second complete tower (including its own BC2 base) and connect the two towers in parallel using an external high-voltage DC combiner box.
What is the total assembled height and weight of the 5-module tower?
1,566 mm height (approx. 61.6 inches / 1.57 m); 263.5 kg total weight. * Total Height: 1,566 mm (approx. 1.57 m) on its leveling pedestal. * Total Weight: 263.5 kg (approx. 581 lbs). * Mandatory Installation Step: Securing the included top wall-mounting bracket into solid masonry is mandatory to prevent tipping hazards.
Approved pairings
SAJ CH3-100K-T8Item number DLK-SAJ-CH3100KT8CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ CH3-110K-T8Item number DLK-SAJ-CH3110KT8CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ CH3-125K-T8Item number DLK-SAJ-CH3125KT8CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ CH3-75K-T6Item number DLK-SAJ-CH375KT6CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ CH3-80K-T6Item number DLK-SAJ-CH380KT6CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ CH3-99.9K-T8Item number DLK-SAJ-CH3999KT8CB3-L261 and CB3-M20, through the CB3-HVC high-voltage cabinet. SAJ's CB3 datasheet states it directly: the battery is compatible with SAJ CH2 and CH3 series inverters. 60 to 260 kWh per cluster.
SAJ H2-10K-T3 (10 kW three-phase hybrid inverter)Item number DLK-SAJ-H210KT3B2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ H2-12K-T3 (12 kW three-phase hybrid inverter)Item number DLK-SAJ-H212KT3B2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ H2-15K-T3Item number DLK-SAJ-H215KT3B2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ H2-20K-T3Item number DLK-SAJ-H220KT3B2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ H2-25K-T3Item number DLK-SAJ-H225KT3B2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ H2-30K-T3-DEItem number DLK-SAJ-H230KT3DEB2-5.0-HV1 to B2-25.0-HV1 and B2-5.0-HV5 to B2-25.0-HV5, through the BC2-HV1 control module. SAJ's Configuration Instructions V1.0 state the system as H2 plus BC2 plus BU2. CAVEAT: the signed statement is SAJ's Oceania issue and names the -AU model variants. Ask SAJ to confirm the EU and DE variants in writing before a first order.
SAJ HS2-10K-T2-XItem number DLK-SAJ-HS210KT2XBU2-5.0-HV1/HV5, up to 5 battery modules. Battery window 180 to 600 V.
SAJ HS2-5K-T2-X (5 kW three-phase hybrid inverter)Item number DLK-SAJ-HS25KT2XBU2-5.0-HV1/HV5, up to 5 battery modules. Battery window 180 to 600 V.
SAJ HS2-6K-T2-XItem number DLK-SAJ-HS26KT2XBU2-5.0-HV1/HV5, up to 5 battery modules. Battery window 180 to 600 V.
SAJ HS2-8K-T2-XItem number DLK-SAJ-HS28KT2XBU2-5.0-HV1/HV5, up to 5 battery modules. Battery window 180 to 600 V.
