Sun Gold Power 4000W 12V Inverter Charger 120A 12kW Surge

Product Overview

This Sun Gold Power 4000W 12V pure sine wave inverter with charger is built for 12V battery setups that need dependable 120V AC power in RVs, trailers, motorhomes, truck campers, and off-grid or backup systems. It is a low-frequency inverter that combines the inverter, built-in battery charger, and automatic transfer switch in one unit, so the power system stays cleaner and easier to manage. When you are running tools, kitchen loads, or the basics in a tight electrical space, an all-in-one inverter charger helps keep the setup organized and predictable.

On the output side, it delivers pure sine wave 120VAC power with bypass mode, rated for 4000W continuous output. It also provides a surge rating of 12,000W for 20 seconds, giving extra headroom for short start-up events and demanding appliances. Typical transfer time is 10ms, which supports smoother switching between AC input and battery power. Output frequency supports 50Hz or 60Hz, and nominal efficiency is listed as greater than 88%.

For 12V systems, the DC input specs are clearly defined. Nominal input voltage is 12V with a minimum start voltage of 10V. The low battery alarm range is 10.5V to 11.0V, and the low battery trip range is selectable from 10.0V to 10.5V. High voltage alarm is 16V, and low battery restart voltage is 13V. Idle consumption is 45W, with power saver mode idle consumption at 18W, which helps reduce waste when the inverter is on but loads are light.

Charging is handled by the integrated AC charger with a 120A ±5A charger rate. AC input voltage is 120VAC, with a selectable AC input range of 90–135VAC or 100–135VAC. Charge settings are selectable based on battery type with adjustable charge current from 0% to 100%, and charging follows a 3-step intelligent battery charging method. Overcharge protection shutdown is specified at 15.7V. Control and visibility are straightforward through the LCD display for system monitoring, and remote control plus a BTS cable are included. This unit also supports automatic generator start when battery voltage is low and lets you select AC or battery priority via switch. A GFCI socket is included for enhanced safety.

Key Features

• 4000W low-frequency pure sine wave inverter with integrated charger
• Inverter, battery charger, and AC auto-transfer switch in one unit
• AC or battery priority selectable via switch
• Automatic generator start when battery voltage is low
• Adjustable charging current from 0% to 100%
• Supports 50Hz or 60Hz output frequency
• GFCI socket for enhanced safety
• LCD display for system monitoring
• Remote control and BTS cable included
• Low idle current for improved efficiency
• Suitable for RV, trailer, motorhome, truck camper, backup, and off-grid use

Specifications

• Continuous output power: 4000W
• Surge rating: 12000W, 20 seconds
• AC output voltage: 120VAC
• AC input voltage: 120VAC
• Output waveform: pure sine wave, bypass mode
• Typical transfer time: 10ms
• Nominal efficiency: greater than 88%
• Nominal input voltage: 12V
• Minimum start voltage: 10V
• Low battery alarm: 10.5V–11.0V
• Low battery trip: 10.0V–10.5V, selectable
• High voltage alarm: 16V
• Low battery restart voltage: 13V
• Idle consumption: 45W
• Power saver mode idle consumption: 18W
• Charger rate: 120A ±5A
• AC input range: 90–135VAC, 100–135VAC selectable
• Overcharge protection shutdown: 15.7V
• Selectable charge settings based on battery type, adjustable charge current 0%–100%
• 3-step intelligent battery charging
• 4000W 12V low-frequency pure sine inverter
• User manual
• Remote control
• BTS cable
• Unit weight: 62.2 lb
• Unit size: 25.6 × 9.1 × 7.5 inch
• Shipping weight: 71 lb
• Shipping size: 30.3 × 13.4 × 12.8 inch

What’s Included

• 4000W 12V low-frequency pure sine inverter
• User manual
• Remote control
• BTS cable

Best For

• RV, trailer, motorhome, and truck camper builds needing stable 120VAC pure sine power
• 12V battery systems that want an all-in-one inverter, charger, and automatic transfer switch
• Demanding appliance and tool start-ups needing 12,000W surge capability for 20 seconds
• Systems needing 120A ±5A AC charging with 0%–100% adjustable charge current
• Generator-backed builds using automatic generator start when battery voltage is low
• Installations where lower standby draw matters with 18W power saver mode idle consumption

Why This One Makes Sense

This inverter charger is a solid fit when you need high-capacity 120VAC power from a 12V battery system and you want the charging and transfer functions built in. You get 4000W continuous pure sine output with bypass mode, plus 12,000W surge for 20 seconds for short start-up events. Typical 10ms transfer time helps keep the system switching sources smoothly, and AC or battery priority selection via switch keeps the operating behavior aligned with how the rig or site is set up. The integrated 120A ±5A charger with selectable AC input range and 0%–100% adjustable charging current supports better control over battery charging, while the 18W power saver idle consumption helps reduce standby waste. Add the included remote control and BTS cable, LCD monitoring, automatic generator start support, and a built-in GFCI socket, and it fits mobile and off-grid systems that need dependable power without extra boxes.