AoKu AKESS Flex Series Stackable All-In-One Energy Storage System (1.2kW / 1.28kWh - 5.12kWh)
AoKu AKESS Flex Series Stackable All-In-One Energy Storage System (1.2kW / 1.28kWh - 5.12kWh)
AoKu AKESS Flex Series (1200W Inverter | 1.28kWh Base Battery, Expandable to 5.12kWh) is a stackable modular All-In-One LiFePO4 Energy Storage System. Featuring a built-in 1.2kW pure sine wave AC inverter, 800W MPPT solar charge controller (17-115VDC), 10ms UPS seamless transfer, Bluetooth & LCD telemetry, and tool-free vertical stacking expansion up to 4 battery modules (5.12kWh) for home backup and off-grid power autonomy.
KEY FEATURES & BENEFITS
Tool-Free Stackable Modular Expansion (Up to 5.12kWh)
Innovatively engineered with vertical stackable pin connectors. Start with the base 1200W / 1.28kWh system and seamlessly add up to 4 battery modules in series to expand capacity up to 5.12kWh (100Ah) without cluttered external cables or complex installation tools.
High-Efficiency Built-in 800W MPPT Solar Charger
Loaded with an integrated Maximum Power Point Tracking (MPPT) charge controller supporting 800W maximum PV solar input and a wide 17-115VDC tracking voltage window. Delivers over 90% peak solar charging efficiency under changing weather conditions.
1.2kW Pure Sine Wave Inverter & 10ms UPS Backup
Delivers clean 220V-240V AC output with <10ms instantaneous UPS switchover during municipal grid blackouts. Safely powers sensitive electronics, home appliances, laptops, refrigerators, and television sets without voltage surges or harmonic distortion.
Long-Life Grade-A LiFePO4 Chemistry (10+ Year Life Design)
Powered by Tier-1 12.8V 100Ah (1280Wh) Lithium Iron Phosphate (LiFePO4) battery modules featuring high thermal stability, non-combustible safety, 150A continuous charge/discharge rating, and an ultra-low monthly self-discharge rate of ≤3.5% at 25°C.
Smart Bluetooth Telemetry & Visual LCD Display
Equipped with integrated Bluetooth wireless connectivity and a clear graphic LCD screen. Homeowners and technicians can track battery SOC %, real-time charge/discharge wattage, PV solar yield, and system operating parameters on-screen or via mobile APP.
200% Inrush Surge Capacity & Dual AC Input Window
Handles high-inrush motor loads with surge ratings up to 200% for 10 seconds (120%~200% load). Supports dual selectable AC input voltage ranges (170-280VAC for PCs / 90-280VAC for general appliances) and 2-50A adjustable AC charging current.
PRODUCT SPECIFICATIONS
| Category | Technical Parameter | AKESS Flex Base System | Max Stacked System (4 Units) |
|---|---|---|---|
| ⚡ Inverter & System Ratings | |||
| System System Ratings | Rated Inverter Capacity | 1200 W (1.2 kW) | 1200 W (1.2 kW) |
| Battery Energy Storage Capacity | 1.28 kWh (1280 Wh) | 5.12 kWh (5120 Wh) | |
| Base Battery Configuration | 1x 12.8V 100Ah Module | 4x 12.8V 100Ah Series Stack | |
| Physical Dimensions (W×D×H) | 340 × 172 × 255 mm (Base Module) | ||
| Net Weight (Reference) | 13.2 kg | ~52.8 kg (4 Stacked Modules) | |
| 🔌 AC Utility Input Specification | |||
| AC Mains Input | Rated Input Voltage | 208 / 220 / 230 / 240 VAC | |
| Selectable AC Voltage Window | 170~280 Vac (PCs) | 90~280 Vac (Home Appliances) | ||
| AC Input Frequency Range | 40 ~ 70 Hz (Auto Sensing) | ||
| Max. AC Input Current | 10 A | ||
| AC Charging Current Range | 2 ~ 50 A Adjustable | ||
| ☀️ PV Solar Input Specification | |||
| PV Solar Input | Solar Controller Type | Built-in High-Efficiency MPPT Controller | |
| Max. PV Input Power | 800 W | ||
| MPPT Tracking Voltage Range | 17 ~ 115 VDC | ||
| Max. PV Input Open Voltage | 115 VDC | ||
| PV Charging Current Range | 2 ~ 50 A | ||
| Max. Total Charging Current | 100 A | ||
| 💡 AC Output & Inverter Specification | |||
| Inverter AC Output | Rated AC Output Power | 1.2 kW (1200 W) Pure Sine Wave | |
| Rated Output Voltage / Freq | (220V ~ 240V) ± 5% | 50/60 Hz ± 0.1% | ||
| Overload Surge Capability | 60s @ 102%~120% Load | 10s @ 120%~200% Load | ||
| Peak Efficiency | >90% (Battery Mode) | >96% (Line Mode) | ||
| UPS Transfer Switch Time | 10 ms (Sub-10ms Instantaneous Switchover) | ||
| 🔋 LiFePO4 Battery Module Specification | |||
| Battery Module | Battery Chemistry Cell Type | Grade-A LiFePO4 (Lithium Iron Phosphate) | |
| Rated Module Voltage / Capacity | 12.8 V Nominal | 100 Ah @ 0.2C (1280 Wh Base) | ||
| Designed Lifespan Design | 10+ Years Lifetime Design | ||
| Self-Discharge Rate | ≤ 3.5% per month @ 25°C | ||
| Charging Voltage & Mode | 14.8V ± 0.2V (CC/CV Mode up to 0.5C) | ||
| Max. Continuous Charging Current | 150 A | ||
| Max. Continuous Discharging Current | 150 A | ||
| Discharge Cut-Off Voltage | 8.8 V | ||
| Max. Stacked Expansion Units | Up to 4 Batteries in Series (Total 5.12kWh) | ||
| 📡 Communication & User Interface | |||
| Communication Interface | Display & Wireless Connectivity | Built-in Bluetooth Wireless Telemetry & Digital LCD Screen | |
Technical Documentation
Access complete industrial specification layouts, installation blueprints, communication protocol guides, and international compliance certifications.
Technical Catalog
Get the AoKu AKESS Flex Series catalog for full electrical specifications, cabinet dimensions, battery configurations, wiring guides, and certifications.
User Manual
Get the AoKu AKESS Flex Series user manual for step-by-step installation, wiring diagrams, LCD settings, warning/fault code solutions, and battery maintenance.
PRODUCT APPLICATIONS
The AoKu AKESS Flex Series Stackable All-In-One Energy Storage System provides compact, dependable, and expandable electrical power. Featuring a 1.2kW pure sine wave inverter and 1.28kWh-5.12kWh modular LiFePO4 battery capacity, it integrates seamlessly across six key application scenarios:
🏠 Residential Emergency Home Backup
Provides clean sub-10ms UPS power for home refrigerators, LED lighting, Wi-Fi routers, televisions, and kitchen appliances during sudden grid blackouts and severe weather events.
☀️ Remote Off-Grid Solar Cabins & Cottages
Pairs with up to 800W solar arrays and 5.12kWh stacked battery modules to deliver 24/7 off-grid electricity for remote mountain cabins, vacation homes, and eco-estates.
🚐 Mobile RVs, Motorhomes & Camping Travel
Compact 340×172×255mm footprint fits easily inside overland RVs, campervans, and glamping sites to power induction cooktops, laptops, cameras, and portable refrigeration.
🏬 Telecom Outposts & Remote IoT Field Stations
Delivers highly reliable 1.2kW continuous power and Bluetooth telemetry monitoring for off-grid weather monitoring stations, agricultural IoT sensors, and telecom repeaters.
🏬 Small Commercial Shops & POS Terminal Protection
Shields retail store POS systems, security surveillance cameras, barcode scanners, and payment gateways from business downtime caused by local power grid flickers.
🏥 Medical CPAP Devices & Sensitive Lab Backup
Pure sine wave AC output (<5% THD) guarantees ultra-quiet, stable electricity for home medical devices, oxygen concentrators, CPAP sleep apnea equipment, and lab analyzers.
PRODUCT SOLUTIONS
Technical solution architectures engineered by AoKu Energy to eliminate complex installation, slow solar charging, and battery expansion limits in residential energy storage:
📈 Flexible Pay-As-You-Grow Modular Battery Expansion
The Problem: Fixed-capacity all-in-one ESS units force homeowners to pay upfront for oversized battery storage they may not initially need.
AoKu Solution: AKESS Flex uses vertical stackable pin interconnection. Start with a single 1.28kWh module and stack up to 4 battery units as energy demand increases, scaling smoothly to 5.12kWh with zero additional wiring costs.
🔄 Sub-10ms Seamless UPS Switching for Sensitive Loads
The Problem: Slow off-grid inverter transfer times (>20ms) cause computers to shut down and NAS storage networks to corrupt data during sudden outages.
AoKu Solution: Integrated hardware static transfer switches transition from utility AC to 1.2kW battery inverter power in under 10ms, maintaining continuous zero-downtime protection.
☀️ Optimized 800W MPPT Solar Harvest Under Cloud Cover
The Problem: Traditional PWM solar chargers suffer up to 30% solar yield losses during overcast morning and evening hours.
AoKu Solution: Integrated high-speed MPPT tracking (17-115VDC window | 800W PV) locks onto the maximum power point continuously, boosting energy harvest efficiency by over 30%.
⚙️ High-Inrush Motor Surge Capability (200% Peak Load)
The Problem: Inductive loads like refrigerator compressors, water pumps, and power tools trigger instant overload trip-outs on ordinary 1kW inverters.
AoKu Solution: Advanced power electronics support 200% peak surge capability for 10 seconds (up to 2400W peak), smoothly starting heavy motor loads without inverter shutoff.
📦 Ultra-Compact Space-Saving Vertical Footprint
The Problem: Bulky horizontal battery banks and separate inverter cabinets consume valuable floor space in apartments and small homes.
AoKu Solution: Space-saving vertical 340×172mm base footprint occupies minimal floor space while providing clean, modern aesthetic integration for living rooms and utility closets.
🔋 Grade-A LiFePO4 Safety & 10+ Year Long Life Guarantee
The Problem: Lead-acid batteries degrade rapidly within 2-3 years, while inferior lithium cells pose thermal runaway and fire risks.
AoKu Solution: Premium 12.8V 100Ah Lithium Iron Phosphate (LiFePO4) chemistry engineered for 10+ year service life, backed by 150A continuous discharge rating and ≤3.5% low monthly self-discharge.
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