Magnum Energy 4000 Watt 48 Volt Sine Wave 120V Inverter & Charger With 20A Circuit Breakers

Product description

The Magnum Energy MS4048-20B is a powerful pure sine wave Inverter/Charger, ideal for mobile, off grid, and standalone applications. The AC output of this unit is 120 Volts AC single phase, but two inverters can be stacked to produce a combined 8000W, 120/240VAC inverter. When connected to an AC source, the MS4048-20B can pass through 30 Amps per leg to power loads, while at the same time charging the batteries. In this mode, the unit is not inverting, and will not push power back to the grid. The 20B unit has two 20 Amp AC circuit breakers built in, allowing for branch circuits to be connected directly to the inverter’s output. This inverter will require a minimum of 150A overcurrent protection, and #1 AWG wire to the battery for 5ft runs, or 2/0 AWG for runs longer than 10ft.

One of the best features of this inverter is the power factor corrected (PFC), Proportional-Integral (PI) multi-stage battery charging. This type of charger is included on all MS series inverters and greatly increases battery charging efficiency from an AC power source. It optimizes the AC input waveform and allows the voltage and current to be adjusted independently, which maximizes the real AC power available. This means you will use 25% to 30% less current than a standard charger. If you’re using a generator, this translates into decreased run time and less fuel consumption to get your batteries up to a full charge.

The MS Series is ETL listed to the stringent requirements of UL/cUL 458 for mobile use and UL 1741 for off grid installations.


  • Input battery voltage range: 36 – 67.6 Volts
  • AC output voltage: 120 Volts (+/- 5%)
  • Output frequency: 60 Hz (+/- 0.1 Hz)
  • Power rating: 4,000 Watts
  • 5 sec. surge power: 8,500 Watts
  • 5 min. surge power: 5,250 Watts
  • Inverter efficiency: 94%
  • Power consumption – searching: <8 Watts
  • Power consumption – inverting (no load): 25 Watts
  • Output waveform: Pure sine wave
  • Charger power factor: >0.95
  • Internal cooling: dual brushless fans
  • Dimensions: 13.75″ x 12.65″ x 8.0″
  • Weight: 55 pounds
  • 3 year warranty
  • 5 year warranty if installed on an MP or MMP panel


Magnum Energy

Magnum Energy is a leading manufacturer of advanced power conversion equipment and energy management systems for solar and renewable energy applications. The company's product line includes solar inverters, chargers, and battery monitoring systems that are designed to maximize solar energy production and minimize waste, ensuring that customers get the most out of their solar energy systems. With a focus on innovation and quality, Magnum Energy's solar products are built to withstand harsh environments and deliver exceptional performance in a range of solar applications. Whether for residential or commercial use, Magnum Energy's solar solutions provide a reliable and efficient source of solar power for all off-grid and renewable energy needs.