Specifications

• Rated AC Output Power: 300W
• Output Voltage Waveform: Pure Sine Wave
• Output Voltage: 185V ~ 230Vac, 50Hz
• Low DC Warning Point: ≤ 3.2Vdc
• Low DC Cut-off Voltage: 2.9Vdc
• Low DC Warning Return Voltage: > 20%
• Charging Power (Utility + Solar): Max. 400W
• Bulk Charging Voltage: 3.6Vdc
• Float Charging Voltage: 3.5Vdc

AC Input

• Nominal Input Voltage: 230Vac
• Low Loss Voltage: 90Vac ±7
• Low Loss Return Voltage: 100Vac ±7
• High Loss Voltage: 280Vac ±7
• High Loss Return Voltage: 270Vac ±7
• Max. AC Input Voltage: 300Vac
• Nominal Input Frequency: 45~65Hz
• AC Charging Power: Max. 300W

Solar Input

• Nominal PV Voltage: 30Vdc
• PV Array MPPT Voltage Range: 10Vdc ~ 55Vdc
• Max. PV Array Open Circuit Voltage: 56Vdc
• Solar Charging Power: Max. 300W

Built-in Lithium Iron Battery (LiFePO4)

• Battery Capacity: 896Wh
• Nominal Battery Voltage: 3.2Vdc
• Typical Capacity: 280Ah
• Max. Charge Current: 130A
• Max. Discharge Current: 130A
• Operation Voltage Range: 2.9Vdc ~ 3.6Vdc
• Operating Temperature: -10°C ~ +50°C

DC Output

• DC Output Power: Max. 12V 60W
• DC Output Sockets:
• 1× 5V1A USB Charger
• 2× DC 12V 5A
• DC Power Jack (5.5 × 2.1mm)

Display & Indicators

• Display Function: LCD
• LED Indicators:
• 4 pcs SOC indicators
• 1 pcs working status indicator

Protection Features

• Overcharge Protection
• Over-discharge Protection
• Overcurrent Protection
• Short-circuit Protection
• Over-temperature Protection

Environment

• Noise Level: < 40dB (1 meter)
• Working Temperature: -10°C ~ +50°C
• Humidity: 5% ~ 95% (No condensation)
• Sea Level: ≤ 2000m

Dimension & Weight

• Product Size (L×W×H): 294 × 207 × 193 mm
• Package Size (L×W×H): 400 × 274 × 252 mm
• Net Weight: 12 kg

The Sako Alpha ESS 300W All-In-One Energy Storage System is a compact and versatile power solution featuring pure sine wave output, built-in MPPT solar charger, and programmable supply priority for PV, battery, or grid. It supports mobile charging and DC lamp interface, and is compatible with utility mains or generator input. With integrated 1 kWh or 2 kWh LiFePO₄ battery options, it delivers reliable and efficient backup power for homes, offices, or small applications.