Three-Phase Off-Grid Inverter · 18,000W · 48V
18kW of Three-Phase Off-Grid Power with 28.8kW of Solar Input
An 18kW 120/208V three-phase all-in-one solar charge inverter for farms, workshops and light commercial sites – 28.8kW of PV input, dual AC outputs and parallel expansion to 108kW.
PowerCore 18K-48 Overview
The Sungold Power PowerCore 18K-48 is a commercial-grade three-phase off-grid inverter that combines an 18kW pure sine wave inverter, dual MPPT solar charge controllers and a 360A battery charger in one wall-mounted unit. It is built for 120/208V loads that a split-phase inverter cannot serve: commercial kitchens, cold storage and refrigeration, CNC and workshop machinery, irrigation pumps, HVAC and greenhouse equipment.
Two independent MPPT trackers accept up to 14.4kW of solar each (28.8kW total, 600Vdc max), and the 48V battery bus works with SunGoldPower LiFePO4 batteries or lead-acid banks. A 100A continuous grid pass-through and generator input keep the site running through long stretches of poor weather, while the programmable GEN/smart-load port can be set up as either a generator input or a second, non-critical load output.
Need more than 18kW? Up to six PowerCore 18K-48 units run in parallel for 108kW of three-phase output. Four output-priority modes (UTI, SBU, SOL, SUB) and time-of-use scheduling let you decide when solar, battery or grid carries the load.
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PowerCore 18K-48 Key Features
18kW three-phase 120/208V output
Rated 18,000W continuous with 2x surge for 10 seconds, pure sine wave, 50/60Hz, on L1+L2+L3+N+PE – the right format for three-phase motors, compressors and commercial equipment.
28.8kW of solar input
Two MPPT trackers, 36A each, 120-550Vdc operating window and 600Vdc maximum let you build large strings and harvest up to 14.4kW per tracker.
360A battery charging
Charges from PV, grid or generator at up to 360A on a 48V bus, with 3-stage/equalization curves for lead-acid and BMS self-adaption for lithium packs.
Dual AC output
A main output for critical loads plus a programmable GEN/smart-load port that separates non-essential circuits or accepts a generator.
Parallel to 108kW
Stack up to six units for larger farms, workshops and small commercial facilities without changing the system architecture.
Monitoring and protection
LCD display, RS485/CAN/USB/dry-contact ports, optional Wi-Fi/GPRS/4G module, independent AC and DC breakers and a full protection suite.
What’s in the Box
- 1×PowerCore 18K-48 all-in-one solar charge inverter
- 1×User manual
PowerCore 18K-48 Common Questions
Is the PowerCore 18K-48 a split-phase 120/240V inverter?
No. It outputs 120/208V three-phase (L1+L2+L3+N). For 120/240V split-phase homes, see the Sungold Power FR12K-B or SGS-12K18MAX instead.
How much solar can I connect?
Up to 28.8kW across two MPPT inputs (14.4kW each), with a 600Vdc maximum open-circuit voltage and 120-550Vdc MPPT range.
Can it run from a generator?
Yes. The AC input accepts grid or generator power (100A continuous pass-through) and charges the battery at up to 360A.
Which batteries work with it?
48V lithium batteries with CAN/RS485 communication (SunGoldPower PowerMax, CoreX 5 series) or lead-acid banks using the built-in charge profiles.
PowerCore 18K-48 Specifications
PowerCore 18K-48 18kW Three-Phase Solar Charge Inverter
| Inverter Output | |
| Rated output power | 18,000W (19,800VA) |
| Peak power | 2 x rated, 10s |
| Rated AC output current | 50A |
| Output frequency | 50/60Hz |
| Rated output voltage | 120/208Vac (L1+L2+L3+N+PE) |
| Output voltage range | 120/208Vac ±5% |
| Parallel capacity | 1-6 units (up to 108kW) |
| Battery | |
| Battery type | Lithium-ion / lead-acid / user-defined |
| Rated battery voltage | 48Vdc |
| Battery voltage range | 40-60Vdc |
| Max PV charging current | 360A |
| Max grid/generator charging current | 360A |
| Max charge/discharge current | 360A |
| Charging curve | 3 stages / equalization; self-adaption to BMS for lithium |
| PV Input | |
| MPPT trackers | 2 |
| Max PV array power | 14.4kW + 14.4kW (28.8kW) |
| Max input current | 36A + 36A |
| Min PV / start-up voltage | 100Vdc |
| Max PV input voltage | 600Vdc |
| MPPT operating range | 120-550Vdc |
| Grid / Generator Input | |
| Frequency range | 50/60Hz |
| Input voltage | 120/208Vac (L1+L2+L3+N+PE) |
| AC voltage range | Phase 90-140Vac; line 156-242Vac |
| Continuous grid pass-through | 100A |
| General | |
| Dimensions | 23.36 x 33.40 x 8.47 in |
| Weight | 118 lb |
| Protection | IP20, indoor use |
| Operating temperature | 14-131°F (derated above 113°F) |
| Noise | <60dB |
| Cooling | Intelligent air cooling |
| Communication | RS485 / CAN / USB / dry contact; Wi-Fi / GPRS / 4G stick optional |
| Safety | IEC62109-1, IEC62109-2 |
| EMC | EN61000-6-1, EN61000-6-3, FCC 15 Class B |
| Warranty | 2 years |
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