Phocos PSW-H-3KW-120/24V 3kW Hybrid Inverter/Charger

The Phocos PSW-H-3KW-120/24V is a 3,000VA pure sine wave hybrid solar inverter charger that integrates an MPPT solar charge controller, AC battery charger, and grid/generator transfer switch into a single UL1741-certified unit for 24VDC systems. Designed for flexible deployment across off-grid, grid-tied, and unreliable-grid conditions, it operates as a UPS, a solar self-consumption device, or a battery-free grid-reduction unit—adapting to whatever energy sources are available.

Key specifications

• Continuous output power: 3,000VA / 3,000W
• Surge power: 6,000VA (2× rated, 5-second)
• AC output voltage / frequency: 110–127VAC ±5% (adjustable); 50/60Hz auto-recognition
• DC system voltage: 24VDC
• Integrated MPPT charge controller: 250Vdc max PV input voltage; MPP voltage range 90–230Vdc; 80Adc max usable PV current; 4,000W max usable PV power; 5,000Wp max PV array
• Max charge current (PV AC combined): 80Adc total
• Max AC input current: 38.3Aac
• Compatible battery types: Flooded lead acid, gel, AGM, lithium
• Inverter efficiency (from battery): >90% peak; from PV: >96% peak
• UPS transfer time: 10ms typical (UPS mode); 20ms typical (APL mode)
• Idle self-consumption: <40W
• Connectivity: BLE, USB-OTG, CANbus, RS-485, RS-232, generator start relay; detachable LCD display; 60-day onboard datalogger
• Enclosure / protection: IP21; washable dust filter
• Operating temperature: 14°F to 122°F (−10°C to 50°C); max altitude 13,123 ft. (4,000 m)
• Certifications: UL1741, CSA C22.2 No. 107.1-16, FCC Class A, RoHS compliant
• Dimensions: 18.8 W × 12.2 H × 5.6 D in. (478 × 309 × 143 mm); 27 lbs. (12 kg)
• Warranty: 3 years

Integrated MPPT eliminates a separate charge controller

Most inverter chargers require a standalone MPPT charge controller wired between the solar array and battery bank, adding hardware cost, wiring complexity, and a second point of failure. The PSW-H-3KW-120/24V includes a high-voltage MPPT controller rated to 250Vdc, which allows PV modules to be strung in series rather than requiring parallel strings with a combiner box, string fuses, or blocking diodes. The charge controller continues operating independently even when the inverter is switched off, keeping the battery bank fully charged during periods when AC output is not needed.

Any-Grid operation: off-grid, on-grid, or battery-free

The PSW-H-3KW-120/24V is designed to function under any combination of available energy sources. In fully off-grid deployments it operates as a standalone inverter with solar and generator charging. In grid-connected installations it can prioritize solar to reduce grid draw, switch to the grid when solar and battery are insufficient, and act as a UPS with a 10ms transfer time when grid power fails. For sites with a reliable grid but limited budget, the battery-free mode allows the unit to reduce grid consumption by passing solar power directly to loads without requiring any battery investment—an entry point that can be expanded with storage later. Charging source priorities are fully programmable.

Application scenarios

• Off-grid residential or cabin: Solar-charged 24V battery system with generator backup and programmable auto generator start via relay.
• Unreliable-grid installations: 10ms UPS transfer keeps critical loads—communications equipment, refrigeration, lighting—online during frequent outages.
• Grid-tied self-consumption: Reduces grid draw by prioritizing solar and battery, with the grid as a fallback; grid feed-in is code-protected to prevent accidental export.
• Battery-free grid reduction: Passes solar directly to loads on a stable grid without a battery bank, reducing electricity costs with minimal upfront investment.
• Scalable multi-unit systems: Up to nine units can be connected in parallel, split-phase, or 3-phase configurations for up to 27kW of synchronized output from the 3kW model.

Connectivity and monitoring

The PSW-H-3KW-120/24V includes a detachable LCD display and communication unit with six status LEDs, and supports BLE, USB-OTG, CANbus, RS-485, and RS-232 interfaces alongside a generator start relay. An onboard datalogger stores up to 60 days of performance data. For remote access, the unit is compatible with the Phocos Any-Bridge AB-PLC and PhocosLink Cloud platform for monitoring and control from any internet-connected device. Galvanic isolation of the battery circuit allows both positive and negative battery grounding configurations.

System compatibility

The PSW-H-3KW-120/24V operates on a 24VDC battery bank and accepts flooded, gel, AGM, and lithium battery chemistries with fully adjustable charge voltage set points for float, boost, and equalization stages. It accepts one AC input—grid or generator, not simultaneous—with a 38.3Aac maximum input current. The washable internal filter reduces dust accumulation for installations in dusty or high-particulate environments. Battery wire cross-section up to AWG 0 (50 mm²) and PV wire up to AWG 4 (16 mm²) are supported.

Why choose the Phocos PSW-H-3KW-120/24V?

The Phocos PSW-H-3KW-120/24V is the right choice for 24V system builders who need a UL1741 and CSA-certified hybrid solar inverter charger that handles off-grid, grid-tied, and battery-free operation from a single unit—without a separate MPPT charge controller. The high-voltage 250Vdc PV input reduces array wiring cost, the 10ms UPS transfer time protects critical loads, and the battery-free mode provides a low-cost entry point that can grow into a full storage system over time. Backed by Phocos' Any-Grid platform and PhocosLink Cloud monitoring, it is a well-rounded solution for installations where energy source availability is unpredictable.