Off-Grid Solar Kit · 12,000W · 20.48kWh · 7,200W PV
12kW Off-Grid Solar System with 20.48kWh of CoreX 5 Pro Storage
The most affordable way into a 12kW split-phase off-grid system: the FR12K-B inverter, four CoreX 5 Pro rack batteries (20.48kWh) and sixteen 450W bifacial N-type panels (7,200W), with RSD, breakers and bus bar included.
FR-12K20CP Overview
The FR-12K20CP gives a home or cabin true 240V off-grid capability – 12,000W continuous, 24,000W surge – at an entry price. The FR12K-B all-in-one inverter/charger handles solar charging on two MPPTs, generator charging at 120A, load transfer in 10ms and rapid shutdown, all inside one wall-mounted cabinet with its own breakers.
Four CoreX 5 Pro server-rack batteries provide 20.48kWh of LiFePO4 storage at 51.2V, enough for a typical evening-and-night load with reserve. Each module carries a 100A smart BMS and EVE Grade A cells rated for 6,000+ cycles, communicates with the inverter over CAN/RS485, and reports to the SunGoldPower app over Bluetooth and Wi-Fi. Sixteen SGN-450-BDG5 bifacial N-type panels produce 7,200W – about 29kWh a day at four sun hours.
The kit ships with battery brackets, two 50 ft 10 AWG PV extension cables, a 4/0 AWG battery cable, two 25A PV breakers and a 400A bus bar set. It grows easily: the inverter accepts 13.2kW of PV, the battery stack takes up to 15 modules, and up to six inverters can be paralleled. A wall-mounted CoreX 5 Elite version (FR-12K20CE) is available.
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FR-12K20CP Key Features
12kW split-phase all-in-one inverter
FR12K-B: 120/240V output, 24kW surge, dual MPPT, 200A charger, generator input, RSD and breakers built in.
20.48kWh LiFePO4 storage
Four CoreX 5 Pro 5.12kWh rack batteries with EVE Grade A cells and 100A BMS, expandable to 76.8kWh.
7,200W of bifacial N-type solar
Sixteen 450W dual-glass panels at 22.5% efficiency, UL61730 and CEC listed, 30-year performance warranty.
Whole-home 240V loads
Runs well pumps, mini-splits, dryers and ranges that 120V-only systems cannot.
Wi-Fi app monitoring
Track production, consumption and state of charge remotely; set output priority and time-of-use charging.
Grows with you
Add panels (13.2kW input), batteries (15 per stack) or inverters (up to six for 72kW).
What’s in the Kit
- 1×FR12K-B 12,000W 48V 120/240V all-in-one off-grid inverter
- 4×CoreX 5 Pro 100Ah 51.2V 5.12kWh server-rack LiFePO4 batteries
- 16×SGN-450-BDG5 450W bifacial N-type monocrystalline solar panels
- 4×Battery brackets
- 2×50 ft 10 AWG solar extension cables (inverter PV input)
- 1×4/0 AWG battery cable
- 2×25A PV breakers
- 1×400A bus bar set
What 20.48kWh of storage can run
Estimates assume 85% usable energy and typical load ratings; actual runtime depends on your appliances, weather and settings.
FR-12K20CP Common Questions
Is 20.48kWh enough for a house?
It covers a typical evening and overnight load (8-15kWh) with reserve; homes with heavy 240V loads or long cloudy periods should consider the 30.72kWh FR-12K30CP or add CoreX 5 Pro modules later.
How much solar can the inverter take?
Up to 13,200W (6,600W per MPPT), so the 7,200W array leaves room for about 13 more 450W panels.
What is the difference between CP and CE?
CP includes CoreX 5 Pro server-rack batteries with brackets; CE includes CoreX 5 Elite wall-mounted batteries. Same 20.48kWh.
Does the kit ship free?
Yes – free shipping within the contiguous USA (freight delivery for kits), $0 sales tax in most states.
FR-12K20CP Specifications
FR12K-B 12kW All-in-One Off-Grid Inverter
| Inverter Output | |
| Rated output power | 12,000W |
| Peak power | 24,000W |
| Output voltage | 120/240Vac single-phase / split-phase |
| Load motor capacity | 6HP |
| Frequency | 50/60Hz |
| Output waveform | Pure sine wave |
| Switching time | 10ms (typical) |
| Parallel units | Up to 6 (72kW) |
| Battery | |
| Battery type | Lithium-ion / lead-acid / user-defined |
| Rated battery voltage | 48Vdc |
| Voltage range | 40-60Vdc |
| Max PV charging current | 200A |
| Max grid/generator charging current | 120A |
| Max hybrid charging current | 200A |
| PV Input | |
| MPPT trackers | 2 |
| Max PV input power | 6,600W + 6,600W (13,200W) |
| Max input current | 22A / 22A |
| Max open-circuit voltage | 500Vdc |
| MPPT operating range | 125-425Vdc |
| MPPT tracking efficiency | 99.9% |
| Battery-to-AC efficiency | 92% |
| Grid / Generator Input | |
| Input voltage range | 90-140Vac |
| Input frequency | 50/60Hz |
| Bypass overload current | 63A |
| General | |
| Dimensions | 28.48 x 17.64 x 5.91 in (723 x 448 x 150 mm) |
| Weight | 61.73 lb (28 kg) |
| Protection | IP20, indoor use |
| Ambient temperature | 14-131°F (derated above 113°F) |
| Noise | <60dB |
| Cooling | Intelligent fan |
| Communication | RS485 / CAN / USB / dry contact; Wi-Fi / GPRS optional |
| Safety | IEC62109-1, IEC62109-2, UL1741 |
| EMC | EN61000-6-1, EN61000-6-3, FCC 15 Class B |
| Warranty | 2 years |
CoreX 5 Pro 5.12kWh Server Rack LiFePO4 Battery
| Battery | |
| Nominal voltage | 51.2V |
| Nominal capacity | 100Ah |
| Energy | 5.12kWh |
| Cell type | EVE Grade A LiFePO4 |
| Voltage range | 43.2-56.8V |
| Charging current limit | 50A |
| Max continuous charge current | 95A |
| Max discharge current | 100A (100A smart BMS) |
| Cycle life | 6,000+ cycles |
| Communication | CAN / RS485; Bluetooth and Wi-Fi monitoring |
| Parallel | Up to 15 units (76.8kWh) |
| General | |
| Recommended operating temperature | 50-113°F |
| Dimensions | 20.80 x 17.64 x 5.91 in (3U rack) |
| Weight | 94.8 lb |
| Warranty | 10 years |
SGN-450-BDG5 450W Bifacial N-Type Solar Panel
| Electrical | |
| Peak power | 450W (power tolerance 0/+5W) |
| Cell type | N-type monocrystalline, 96 cells (2 x 48) |
| Module efficiency | 22.5% |
| Bifaciality | 80% ±10% |
| Max power voltage (Vmp) | 30.08V |
| Max power current (Imp) | 14.97A |
| Open-circuit voltage (Voc) | 35.03V |
| Short-circuit current (Isc) | 16.05A |
| Max fuse rating | 30A |
| Mechanical | |
| Dimensions | 69.37 x 44.65 x 1.38 in (1762 x 1134 x 35 mm) |
| Weight | 53.35 lb (24.2 kg) |
| Construction | Bifacial dual-glass |
| Operating temperature | -40 to 185°F |
| Certifications | UL61730, CEC listed |
| Warranty | 12 years materials and workmanship, 30 years performance |
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