Nexmetal 24V DC Battery Powered Mini Split Air Conditioner Heat Pump Review – 0.75 Ton 9,000 BTU Off-Grid Climate Control System
The Nexmetal 24V DC battery powered Mini Split Air Conditioner Heat Pump (0.75 Ton – 9,000 BTU/h) is designed for users who need efficient cooling and heating directly from a 24V battery system. Built specifically for off-grid homes, solar-powered cabins, RV conversions, marine installations, and remote workshops, this system operates natively on 21–30V DC current without requiring an inverter.
Unlike traditional mini split systems that depend on AC power conversion, this 24V DC mini split heat pump delivers energy directly from a battery bank to a true 24V DC compressor and fan system. The result is improved efficiency, reduced energy loss, and simplified installation in solar environments.
In this detailed review, we will explore its technical specifications, energy efficiency, heating and cooling performance, solar compatibility, installation requirements, real-world use cases, and overall value.
Product Overview
The Nexmetal 24V DC 0.75 Ton Mini Split is a wall-mounted mini split system that provides both cooling and heating functions. Key highlights include:
- Cooling capacity: 9,000 BTU/h (2,600 W)
- Heating capacity: 13,000 BTU/h (2,800 W)
- Rated power input: 500 Watts (20.8 A)
- SEER rating: 15
- Voltage range: 21–30V DC
- Native 24V DC compressor and fan motors
- Memory function after power failure (up to 24 hours)
- Included 10 ft insulated lines, drain line, and remote
This system is ideal for users operating 24V lithium or AGM battery banks who want a reliable, inverter-free air conditioning solution.
Technical Specifications Table
Below is a structured data table based on manufacturer and Amazon listing information:
| Feature | Specification |
|---|---|
| Brand | Nexmetal |
| Model Type | 24V DC Battery Powered Mini Split |
| Form Factor | Mini-Split |
| Capacity | 0.75 Ton |
| Cooling Capacity | 9,000 BTU/h (2,600 W) |
| Heating Capacity | 13,000 BTU/h (2,800 W) |
| Voltage Range | 21–30 Volts DC |
| Rated Power Input | 500 Watts (20.8 A) |
| SEER | 15 |
| Color | White |
| Product Dimensions | 11″D x 30″W x 21″H |
| Start Year | 2023 |
| Special Feature | Native 24V DC Operation |
| Included Accessories | 10 ft insulated lines, drain line, remote |
Native 24V DC Operation – No Inverter Required
One of the most important features of this Nexmetal 24V DC mini split is that it runs directly on 21–30V DC power.
Traditional AC mini splits require:
- 110V or 220V AC input
- DC-to-AC inverter for solar systems
- Higher startup surge handling
In contrast, this unit eliminates the inverter entirely.
Advantages of Direct DC Operation
- No energy loss from DC-to-AC conversion
- Lower system complexity
- Reduced heat generation
- Higher overall efficiency
- Greater compatibility with 24V battery banks
This makes it particularly well-suited for solar-powered off-grid systems.
Cooling Performance – 9,000 BTU Capacity
With a cooling capacity of 9,000 BTU/h (2,600 W), this system is capable of effectively cooling:
- Small to medium cabins
- RV interiors
- Tiny houses
- Bedrooms up to approximately 400 square feet
- Small workshops
- Marine living quarters
Efficient Cooling Output
Despite drawing only 500 watts, the system delivers substantial cooling performance. Because it operates natively on DC power, nearly all available battery energy is directed to the compressor and fans.
This results in:
- Reduced battery strain
- Longer runtime compared to AC systems
- Stable indoor temperature control
Heating Performance – 13,000 BTU Heat Pump
The heating performance of this unit is particularly impressive.
Heating Capacity:
- 13,000 BTU/h (2,800 W)
Unlike resistance heaters that consume high amounts of electricity, this system uses a heat pump mechanism. A heat pump transfers heat rather than generating it directly, which significantly improves efficiency.
According to product information, it provides heating efficiency up to five times greater than a traditional electric heater.
Benefits of Heat Pump Heating
- Lower power consumption compared to resistance heaters
- Efficient cold-weather operation
- Reduced battery drain
- Year-round functionality
The higher heating output compared to cooling capacity makes this model particularly attractive for colder climates.
SEER 15 Energy Efficiency Rating
The SEER rating of 15 indicates solid seasonal cooling efficiency. While some higher SEER systems exist, this rating balances performance and power draw in off-grid environments.
When paired with its inverter-free DC operation, the effective efficiency in solar applications becomes even more significant.
Efficiency in Off-Grid Systems
The manufacturer states this system is:
- Twice as efficient as a 220V mini split
- Effectively three times more efficient in off-grid systems without an inverter
This efficiency improvement comes primarily from eliminating AC conversion losses.
True 24V DC Compressor and Fan Motors
This is not a modified AC unit. It features:
- True 24V DC compressor
- True 24V DC indoor and outdoor fans
Why This Matters
- Lower startup surge
- Smooth voltage delivery
- Reduced electrical stress
- Enhanced longevity
AC mini splits often experience high surge currents when starting. This DC-native design minimizes surge demand, protecting battery banks and wiring systems.
Power Consumption and Battery Runtime
Rated Power Input: 500 Watts (20.8 A)
For example:
A 24V 200Ah lithium battery bank stores approximately 4,800 Wh.
At 500W consumption, theoretical continuous runtime equals:
Approximately 9–10 hours, depending on cycling and temperature demand.
Because mini splits cycle rather than run continuously, actual runtime may extend significantly.
This makes it suitable for:
- Daytime solar cooling
- Evening operation from battery reserves
- Remote off-grid living
Memory Function After Power Failure
The unit remembers its last operating mode for up to 24 hours after power interruption.
This is especially useful for:
- Solar fluctuations
- Battery voltage drops
- Automatic restart after charging resumes
- Maintaining consistent settings
It reduces manual adjustment needs in off-grid systems.
Installation Components Included
The package includes:
- 10 ft insulated refrigerant lines
- Drain line
- Remote control
These components simplify installation and reduce additional expenses.
However, installation typically requires:
- Proper mounting
- Refrigerant line vacuuming
- Electrical wiring knowledge
Professional installation is recommended for optimal safety and efficiency.
Design and Physical Dimensions
The indoor unit measures:
- 11 inches deep
- 30 inches wide
- 21 inches high
Its white exterior design blends well in residential and mobile environments.
The compact size allows installation in tight spaces without overwhelming small rooms.
Ideal Applications
The Nexmetal 24V DC 9,000 BTU mini split is best suited for:
- Off-grid cabins
- Solar-powered tiny homes
- RV conversions
- Van life setups
- Boats and marine cabins
- Remote offices
- Emergency backup cooling systems
It is not intended for whole-house central air but excels in focused small-to-medium space climate control.
Advantages Summary
- Native 24V DC operation
- No inverter required
- 9,000 BTU cooling
- 13,000 BTU heating
- Heat pump efficiency
- 500W rated power input
- Memory restart feature
- Solar compatibility
- Reduced startup surge
- Included installation kit components
Limitations to Consider
- Designed for smaller areas
- Requires 24V battery system
- Professional installation recommended
- Not a replacement for large central HVAC systems
Understanding these limitations ensures proper application.
Comparison with Traditional 220V Mini Splits
| Feature | Nexmetal 24V DC | Standard 220V Mini Split |
|---|---|---|
| Inverter Required | No | Yes |
| Conversion Loss | None | Moderate |
| Startup Surge | Low | Higher |
| Solar Compatibility | Excellent | Moderate |
| System Complexity | Lower | Higher |
For users operating 24V battery banks, the inverter-free design offers meaningful efficiency improvements.
Real-World Use Case Example
In a 24V off-grid cabin with:
- 24V 300Ah lithium battery bank
- 2,000W solar array
This unit can operate throughout peak sunlight hours and continue into evening without excessive battery depletion.
The combination of moderate power draw and heat pump efficiency makes it practical for sustainable living setups.
Final Verdict
The Nexmetal 24V DC battery powered Mini Split Air Conditioner Heat Pump (0.75 Ton – 9,000 BTU) is a specialized climate control solution designed specifically for 24V battery and solar systems.
Its inverter-free design, true 24V DC components, 9,000 BTU cooling, and strong 13,000 BTU heating capacity make it well-suited for off-grid applications. While it is not intended for large homes, it performs efficiently in cabins, RVs, tiny houses, and remote installations.
For users seeking reliable, efficient, and solar-compatible cooling and heating without the complexity of AC conversion, this mini split offers a practical and focused solution.