OFF-GRID PWM3KW50A Solar Photovoltaic Inverter with WiFi function, complete with two Bass Polska AGM BP-5976 batteries (x2) — a ready-made solution for powering a home or small facility. This kit works as follows: when there is no power supply, the inverter automatically switches to battery power; when the grid is restored, the inverter switches to battery charging mode. When using the kit to power a gas boiler, refrigerator, lighting, internet, TV, or computer, the proposed set will provide up to 15-26 hours of operation before full discharge. In case of maximum load up to 3 kW (e.g., circulation pumps, hair dryers, electric ovens, dishwashers and washing machines, electric stoves), the kit can sustain operation for approximately 1 hour. The full charging time for fully discharged batteries averages 10-15 hours, provided an optimal charging current of 20 Ah, which is considered safe and optimal for batteries. The kit includes two AGM (Absorbed Glass Mat) batteries, each with a capacity of 130 Ah and 12V power; when connected in parallel, they will provide the necessary 24V for the inverter to operate, with a total capacity of 2500 Wh.

OFF-GRID PWM3KW50A is a multifunctional inverter and charger that combines the functions of an inverter, a solar PWM charge controller, and a battery charger. Thanks to its built-in capabilities and WiFi support, you get system control and monitoring along with reliable autonomous power.

Technical Data

Grid Mode

• Input voltage waveform – sine wave (from grid or generator)
• Nominal input voltage – 230V AC
• Low voltage disconnect – 170V AC (UPS), 100V AC (typical electrical devices)
• Maximum AC input voltage – 300V AC
• Nominal input frequency – 50 Hz / 60 Hz (auto-sensing)
• Output short-circuit protection - grid mode: overcurrent protection; battery mode: electronic protection
• Transfer time – 10 ms (typical UPS); 20 ms (typical – electrical devices)
• Output power reduction – when input voltage drops below 170V AC, output power is limited

Inverter Mode

• Nominal output power – 3kVA / 3kW -3000W
• Output voltage waveform – pure sine wave
• Nominal output voltage – 230V±5%
• Output frequency – 50 Hz
• Peak efficiency – 90%
• Instantaneous peak power – 2x nominal power for 5 s – 6000W
• Nominal input voltage – 24 VDC
• DC voltage at cold start – 23 VDC
• Self-consumption –

This kit is ideal for users looking for an autonomous energy system with the ability to connect a solar power plant and remote monitoring via WiFi. The reliable Bass Polska AGM batteries included in the kit ensure long-term operation during grid outages, and the pure sine wave inverter guarantees stable operation of household and electronic appliances. The OFF-GRID PWM3KW50A model combines ease of use, overload and short-circuit protection, automatic mode switching, and efficient battery charging, making it a convenient solution for home or small business.

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