12000W 48V Split Phase Pure Sine Wave Inverter Charger

Off Grid Solar Inverter 12kW 48V — Authentic [AGS + BTS]

The off grid solar inverter that replaces grid power entirely — this 12,000W 48V split-phase pure sine wave inverter charger delivers 120V and 240V simultaneously from a 48V DC battery bank, with a 115-amp built-in battery charger, auto generator start, battery temperature sensing and 8-millisecond transfer time. It is built for residential homes, off-grid cabins, business backup systems and any application where utility independence demands professional-grade inverter hardware rather than a compromise solution. The offgrid inverter specification is locked: 36kW surge capacity, pure sine wave output, 300% overload headroom and compatibility with every major battery chemistry in current use.

Table of Contents

1. Product Specifications
2. Split-Phase 120V/240V Output
3. 115-Amp Intelligent Battery Charger
4. Auto Generator Start and BTS
5. Transfer Switch and UPS Operation
6. Battery Compatibility
7. Off Grid Solar Products — System Integration
8. FAQ

Product Specifications

DC Input Protection:

Split-Phase 120V/240V Output

Split-phase output is the specification that makes this off grid solar inverter appropriate for genuine residential electrical replacement rather than partial load coverage. Standard North American home wiring uses a split-phase 240V service — two legs of 120V combining to 240V at the main panel. This inverter replicates that exact configuration.

The practical consequence is complete panel replacement. Every circuit breaker in a standard residential panel — from the electric water heater and dryer on 240V breakers to standard outlets and lighting on 120V breakers — operates normally from this inverter output. No circuit limitations, no appliance exclusions and no need for a separate 240V transformer.

At 12,000W continuous with 36,000W of surge capacity for 20 seconds, the unit starts and runs every single-phase motor load in a residential property: HVAC compressors, well pumps, electric water heaters, clothes dryers, workshop compressors and power tools simultaneously within the continuous rating.

115-Amp Intelligent Battery Charger

The integrated 115-amp AC-to-DC battery charger recharges the 48V battery bank when shore power or generator output is available. At 115 amps into a 48V system, the charger delivers approximately 5,520W of charging power — one of the highest charging rates available in the residential solar inverter charger class.

Four-step intelligent charging — bulk, absorption, float and equalisation — with Power Factor Correction (PFC) ensures efficient, chemistry-appropriate battery conditioning across all supported battery types. The 0–100% selectable charge rate enables optimisation against generator capacity, available shore power headroom and battery bank size.

• Bulk phase: Maximum current charging to approximately 80% state of charge.
• Absorption phase: Constant voltage with tapering current to reach full charge.
• Float phase: Maintenance voltage to hold fully charged batteries without overcharging.
• Equalisation phase: Periodic elevated voltage to balance cell voltages in flooded lead-acid banks.

Auto Generator Start and BTS

Auto Generator Start (AGS) activates a connected generator automatically when battery state-of-charge drops below a configurable low-voltage threshold, and shuts it down when batteries reach the target charge level. The 15-second delay before load transfer when AC input recovers protects connected equipment from generator output irregularities during startup — a detail that prevents nuisance trips and appliance damage that generators without stable alternator output can cause during the first seconds of operation.

The Battery Temperature Sensor (BTS) monitors cell temperature and adjusts charging voltage accordingly — applying higher voltage at cold temperatures to compensate for reduced electrochemical activity, and lower voltage at elevated temperatures to prevent accelerated degradation. For this solar energy inverter to deliver its full warranted battery service life, BTS-compensated charging is not optional — it is the feature that separates correctly executed battery systems from systems that degrade prematurely.

Transfer Switch and UPS Operation

The 8-millisecond typical transfer time between utility and battery power is the specification that qualifies this unit as an uninterruptible power supply (UPS) for connected loads. Most consumer electronics, computers and sensitive appliances tolerate brief power interruptions up to approximately 20ms before experiencing operational disruption. At 8ms, this inverter consistently transfers below that threshold.

The AC/Battery Priority mode — inverter-preferred UPS configuration — runs the inverter continuously from battery power with AC input used solely for battery charging. This mode provides zero transfer time for connected loads and is the correct configuration for medical equipment, continuous process equipment and computing infrastructure where even 8ms transfer represents an unacceptable interruption.

Battery Compatibility

Eight battery voltage selections cover every major chemistry in current residential and commercial use:

• LiFePO4 (Lithium Iron Phosphate) — the dominant modern off-grid chemistry with superior cycle life and flat discharge curve.
• Gel batteries — sealed, maintenance-free VRLA chemistry for stationary applications.
• AGM (Absorbed Glass Mat) — high-rate sealed VRLA appropriate for high-current applications.
• Flooded lead-acid — standard wet-cell chemistry requiring equalisation charging support.
• User-defined — custom voltage setpoints for non-standard battery configurations.

The correct chemistry selection applies the right bulk, absorption and float voltage setpoints — the single most important factor in achieving the rated cycle life from any battery chemistry.

Off Grid Solar Products — System Integration

This inverter is the power conversion heart of a complete off grid solar products system. Integration with solar panels uses a separate MPPT charge controller feeding the 48V battery bank, which the inverter then draws from for AC output. The built-in AC charger handles generator and shore power battery charging independently of the solar charge pathway.

For a completely integrated system, pair this unit with a dedicated MPPT solar charge controller sized to the panel array, a correctly specified 48V LiFePO4 battery bank and a generator or shore power source for cloudy-day backup. The result is a fully managed off-grid power system with automatic switching between solar, battery and generator sources.

Explore compatible products in our Off-Grid Solar Inverters, Solar Kits and Off-Grid Power Systems categories.

FAQ

What makes this an authentic off grid solar inverter rather than a backup inverter? A backup inverter is designed for brief operation — minutes to hours — during grid outages. An authentic off grid solar inverter is designed for continuous, indefinite primary operation as the sole AC power source. This 12kW unit is rated for continuous duty at 12,000W, has a 115-amp battery charger for daily deep-cycle charging, supports auto generator start for automatic backup and carries the 8-battery-type compatibility required for long-term off-grid battery system management. These specifications define primary off-grid operation rather than emergency backup.

Does this offgrid inverter work with LiFePO4 batteries? Yes. LiFePO4 (Lithium Iron Phosphate) is one of the eight supported battery chemistries with a dedicated voltage profile selection. The correct LiFePO4 setting applies the appropriate bulk voltage (typically 57.6V for 48V banks), absorption duration and float voltage — protecting the battery management system and ensuring the charger terminates at the correct state of charge without triggering BMS protection cutoffs.

What is the inverter price relative to comparable 12kW split-phase units? The inverter price for this 12kW 48V split-phase unit with 115A charger, AGS, BTS and remote control represents strong value in the professional off-grid inverter class. Comparable units from other manufacturers at equivalent specifications typically command significantly higher pricing. The price reference is in the specifications above; contact for current pricing confirmation before ordering.

Can I parallel multiple units for higher output? This unit supports parallel operation — connect multiple identical units for combined output in single-phase, split-phase or three-phase arrangements. Parallel capability is confirmed in the product documentation. Verify the parallel connection protocol and maximum unit count in the technical manual before configuring a multi-unit installation.

Is this inverter compatible with a generator as AC input? Yes. The AC input range of 184–253V AC (with extended range to 140–270V AC) accommodates generator output voltage variation that falls outside strict utility tolerance. The auto generator start feature directly controls the generator start/stop signal, and the 15-second delay before load transfer when generator AC recovers ensures stable generator output before loads are transferred from battery to incoming AC.