Magnum Energy MS4048-20BL 4000 Watt 48 Volt Sine Wave 120V Inverter & Charger With 20A Circuit Breakers


Due to supply chain delays, Magnum inverters are currently two to six months behind schedule. If you need something sooner, we have put together a list of our recommended alternatives. Please email us or give us a call if you have any questions.

Out of stock

Magnum Energy Pure Sine Wave MS4048-20B Inverter/Charger, 4000 Watts, 48 VDC

NOTE: We are an authorized Magnum Energy dealer. Be careful when browsing the internet for deals on Magnum equipment. According to Magnum's policy, the warranty on equipment purchased from unauthorized dealers is null and void. If you see a price that looks too good to be true, it probably is.

NOTE1: On -15B and -20B models, the pass-thru current is limited by the inverter’s output breaker size.

NOTE2: The -15B/-20B models have a single AC input and cannot be configured for a 60-amp pass-thru capability.

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.

If you prefer to use fuses for the inverter, we offer the FB-1 fuse holder and the F-150T fuses. We recommend placing the fuse as close as possible to the battery bank positive terminal. A circuit breaker gives you the added benefit of acting as a disconnect switch if you ever need to turn off the battery bank connection to your inverter. The MidNite Solar MNEDC175 circuit breaker is the proper size for the MS4048. If you need an enclosure for the circuit breaker, we offer a few options for enclosures that include the 175A breaker.

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 (24.9 kg)

3 year warranty
5 year warranty if installed on an MP or MMP panel

Write Your Own Review
Only registered users can write reviews. Please Sign in or create an account
More Information
Display "Price"Hide