SunGold Power 4000W DC 12V Pure Sine Wave Inverter With Charger

The SunGold Power 4000W DC 12V Pure Sine Wave Inverter With Charger Is the Largest Model in SunGold's 12 Volt LFP Series

The SunGold Power 4000W DC 12V Pure Sine Wave Inverter With Charger combines a 4000 watt low frequency pure sine wave inverter, a 120 amp battery charger, and a 40 amp automatic transfer switch in one unit. It runs 120 volt loads from a 12 volt battery bank, passes grid, shore, or generator power through when it is available, and recharges your batteries at the same time.

It is the top of SunGold's 12 volt LFP lineup, built for RVs, boats, trucks, and backup systems that need to carry several large appliances at once without moving up to a 24 or 48 volt battery bank.

SunGold Power 4000W DC 12V Pure Sine Wave Inverter With Charger Features

4000 Watts Continuous and a 12000 Watt Surge

The low frequency transformer design delivers 4000 watts continuously and up to 12000 watts for 20 seconds. That surge reserve helps it start refrigerators, microwaves, well pumps, air compressors, and other motor loads that briefly pull several times their running wattage.

120 Amp Multi-Stage Charger

With AC input connected, the built-in charger delivers up to 120 amps (±5A) with a 3-step intelligent profile. It offers 9 battery type settings and an adjustable charge current from 0 to 100 percent, so you can match it to lithium, AGM, gel, or flooded batteries and to the output of your generator.

40 Amp Automatic Transfer Switch

SunGold rates the transfer switch on the 4000W model at 40 amps, compared with 30 amps on the 2000W and 3000W versions. When AC input drops, the inverter picks up the load with a typical 10ms transfer time, and the input window can be set to 90 to 135VAC or 100 to 135VAC with SW2.

AC or Battery Priority and Automatic Generator Start

AC priority is the default, which keeps batteries in reserve for outages. Switch to battery priority with SW5 to run from a solar-charged battery bank first. The inverter can also start a compatible generator when the battery voltage is low and stop it when charging is complete.

Remote Control, BTS Cable, LCD, and GFCI Outlet

The package includes a remote control and battery temperature sensor cable. An LCD display, a GFCI outlet, and a power saver mode that drops idle consumption from 45 watts to 19 watts round out the feature set. Output frequency is selectable between 50 and 60Hz with SW4.

Real-World Applications

Large RVs and motorhomes. Run a microwave, induction cooktop, coffee maker, and entertainment system from a 12V lithium bank, then recharge it quickly from shore power or a generator.

Boats and marine systems. Provide household-style pure sine wave power from a 12V house bank for galley appliances and electronics.

Home and small business backup. Keep refrigeration, lighting, networking, and point-of-sale equipment running through outages with automatic transfer.

Off-grid cabins. Combine with a separate solar charge controller and generator for a 12V system that can handle larger loads.

How It Compares to Common Alternatives

Versus the 3000W 12V model. The 4000W unit adds 1000 watts of continuous capacity, a larger 120 amp charger, and a 40 amp transfer switch, at the cost of a larger 25.6 inch long, 62.2 pound chassis.

Versus moving to 24V or 48V. Higher voltage systems draw less current for the same load, which allows smaller cables. If you already have a 12V bank or 12V vehicle system, this model avoids rebuilding the battery bank, but plan for heavy cabling.

Versus all-in-one solar inverters. There is no built-in solar charge controller, so solar charging needs a separate controller.

Is This Inverter Charger the Right Fit

• Battery bank. A 12 volt bank sized for sustained 4000 watt loads is required.
• AC service. It takes 120VAC input and provides 120VAC single phase output.
• Cabling. High current at 12V calls for short, heavy DC cables between batteries and inverter.
• Space. Allow for a 25.6 x 9.1 x 7.5 inch, 62.2 pound unit.

This may be a good fit if

• You need the most output available in a 12V LFP inverter charger
• You want a 120 amp charger for a large battery bank
• You run motor loads that need a strong startup surge
• You want automatic transfer and generator start in one unit

Common Questions

How Large Is the Transfer Switch on This Model?

SunGold rates it at 40 amps for the 4000W 12V model.

Can I Use It With Lithium Batteries?

Yes. SunGold confirms compatibility with lithium iron phosphate batteries, and the charger includes selectable battery type settings.

Does It Have Built-In Solar Charging?

No. Connect solar panels through a separate solar charge controller.

What Is the Idle Draw?

SunGold lists 45 watts at idle and 19 watts in power saver mode.

What's Included

• 1 x SunGold Power 4000W 12V Low Frequency Pure Sine Inverter Charger
• 1 x Remote Control
• 1 x BTS (Battery Temperature Sensor) Cable
• 1 x English Manual

Maximum Output for a 12 Volt System

The SunGold Power 4000W DC 12V Pure Sine Wave Inverter With Charger delivers clean pure sine wave power, a 12000 watt surge, and a 120 amp charger in one heavy-duty unit. At Outbound Power, we help customers plan RV, marine, backup, and off-grid systems around their real loads. If you have questions about cable sizing, battery capacity, or adding solar, our team is happy to help.

SunGold Power 4000W DC 12V Manual