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12kW Off-Grid Solar System with 9kW Panels & 14.34kWh LiFePO4 Battery

$9,999.99 $19,999.99

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About this system

What it is, and what it is for

Power your home, cottage, cabin, farm, or remote property with the ROCKSOLAR 12kW Off-Grid Solar System. Featuring a Growatt SPE12000 US 12kW inverter, 9kW bifacial solar array, and GSL 14.34kWh LiFePO4 battery, this complete system delivers reliable 120/240V split-phase power for residential off-grid living.

Key Features

12kW Growatt SPE12000 US inverter
120/240V split-phase pure sine wave power
Up to 36kW surge power
20 × JA Solar JAM54D41 450W bifacial solar panels
9kW total solar array
14.34kWh GSL LiFePO4 battery
Dual MPPT solar inputs
Supports up to 18kW PV input
Generator charging support
Ideal for homes, cottages, farms, cabins, and remote properties

14.34kWh GSL LiFePO4 Battery

The included GSL residential battery provides dependable, long-life energy storage for demanding off-grid applications.

51.2V / 280Ah
14.34kWh nominal capacity
90% recommended depth of discharge
8,500+ cycle life
Integrated BMS
CAN, RS485 & WiFi communication
IP65-rated enclosure
Expandable up to 16 batteries in parallel
15-year warranty

120/240V Split-Phase Power

The Growatt SPE12000 US supplies both 120V and 240V power, making it suitable for everyday household loads and compatible larger appliances, including refrigerators, lighting, electronics, well pumps, kitchen appliances, washing machines, power tools, and other 240V equipment.

Actual runtime depends on solar production, battery state of charge, and connected loads.

System Specifications

Specification	Details
Inverter	Growatt SPE12000 US
Rated Output	12,000W
AC Output	120/240V Split Phase
Surge Power	Up to 36,000W
Solar Array	9kW
Solar Panels	20 × JA Solar JAM54D41 450W Bifacial
Maximum PV Input	18kW
Battery	GSL 14.34kWh LiFePO4
Battery Voltage	51.2V
Battery Capacity	280Ah
Generator Charging	Supported

What’s Included

1 × Growatt SPE12000 US 12kW Off-Grid Inverter
1 × GSL 51.2V 280Ah 14.34kWh LiFePO4 Battery
20 × JA Solar JAM54D41 450W Bifacial Solar Panels
2 × 40 ft PV Cables
1 × 600V 20A 2-Pole DC Circuit Breaker
1 × Breaker Box

Warranty & Support

GSL 14.34kWh Battery: 15-Year Warranty
Growatt SPE12000 US Inverter: 5-Year Standard Warranty
JA Solar JAM54D41 450W Solar Panels: 12-year product warranty, 30-year linear power warranty
Solar Panel Service Life: 30+ Years
Lifetime ROCKSOLAR Technical Support

Reliable Off-Grid Power for Homes & Cottages

With a 12kW split-phase inverter, 9kW bifacial solar array, and 14.34kWh LiFePO4 battery storage, this system provides a powerful foundation for reliable off-grid living. It is well suited for homes, cottages, cabins, farms, homesteads, and remote properties across the USA.

What ships

6 components, and one thing that isn't here

Each one is a product we sell on its own, so you can read its full listing, and replace or add to it later.

Racking and mounting are not included.

Rails, roof hooks, ground-mount posts and clamps depend on the roof or ground they go on, so no system ships with them. They are sold separately, and the finder adds the right pack for your surface when it sizes a system.

Documentation

Published before you buy. No email required.

The wiring diagram and the commissioning record are drawn from this system's own figures.

The wiring diagram and commissioning record are for customer reference only. They are not a stamped design. Installation, grounding and any grid connection must be carried out by a licensed electrician, and a professional engineer's review is required where your jurisdiction calls for one.

Full specification

Every number, by component.

The figures the manufacturer publishes. The datasheet above is the reference if the two ever differ.

GSL Energy 14.34kWh 51.2V 280Ah LiFePO₄ Battery	Details
Manufacturer	GSL Energy
Battery Chemistry	LiFePO₄ (Lithium Iron Phosphate)
Nominal Voltage	51.2V
Capacity	280Ah
Total Energy	14.34kWh
Usable Energy (80% DoD)	11.47kWh
Recommended Charge / Discharge Current	150A
Maximum Charge / Discharge Current	200A
Peak Discharge Current (2 min @ 25°C)	100A
Cycle Life	≥8,500 cycles @ 80% DoD
Operating Temperature (Charge)	0°C to 55°C
Operating Temperature (Discharge)	-20°C to 55°C
Installation Type	Ground / Outdoor Installation
Ingress Protection	IP65
Scalability	Up to 16 units in parallel (229kWh total)
Communication Interfaces	CAN 2.0, RS485, WiFi, Bluetooth
Dimensions (W × H × D)	700 × 1050 × 200 mm
Weight	Approx. 128.5 kg
Warranty	15 Years
Certifications	UL1973, UL9540A, UL9540, IEC62619, CE-EMC, UN38.3, MSDS

Growatt Off-Grid Storage SPE12000 US	Details
Battery Voltage	46 – 60 VDC (Lithium)
Battery Type	Lithium/Lead-acid
Inverter Output (Rated Power)	12KW
Surge Rating	36KW
Waveform	Pure sine wave/ same as input (bypass mode)
Nominal Output Voltage RMS	120/240Vac (195-255Vac)(optional)
Output Frequency	60Hz (58.3~61.7Hz)
Inverter Efficiency (Peak)	96.50%
Transfer Time	≤20ms Single /≤30ms Parallel
Solar Charger (Maximum PV Charge Current)	27A(Per MPPT)
Maximum PV Array Power	18000W(9000W per MPPT)
AC Input Voltage	120/240Vac
Max. Charging Current	70A
Protection Degree	IP20
Dimensions (W/H/D)	550/465/150 mm
Weight	21.5kg
Operating Environment (Temperature Range)	0°C to 50°C
Warranty	5-year standard warranty

JA Solar JAM54D41 LB 450W N-Type Double Glass Bifacial Solar Panel	Details
Rated Power (as supplied)	450W
Brand	JA Solar
Model	JAM54D41 LB
Power Output Range	430W – 455W
Cell Technology	N-Type Bycium+ Mono-Crystalline
Module Type	Double Glass Bifacial Half-Cell (16BB)
Number of Cells	108 (6 × 18)
Maximum Module Efficiency	Up to 22.5%
Bifaciality Ratio	Approx. 80%
Power Tolerance	0 ~ +3%
Module Dimensions	1762 × 1134 × 30 mm
Module Weight	22 kg
Front Glass	1.6 mm Heat-Strengthened Glass
Rear Glass	1.6 mm Heat-Strengthened Glass
Frame	Anodized Aluminum Alloy (Black, 30 mm)
Junction Box	IP68 Rated with MC4-EVO2 Connectors
Maximum System Voltage	1500 V DC
Maximum Series Fuse	30 A
Operating Temperature	−40°C to +85°C
Temperature Coefficient (Pmax)	−0.29% / °C
Mechanical Load (Front)	5400 Pa
Mechanical Load (Rear)	2400 Pa
Product Warranty	12 Years
Performance Warranty	30-Year Linear Power Warranty (≤ 0.4% annual degradation)
Country of Origin	China

Common questions

Before you order.

If yours isn't here, ask an engineer. It costs nothing and it's the step most people skip.

Is the racking or mounting hardware included?

No. Rails, roof hooks, ground-mount posts and clamps depend on the roof or ground they go on, so no system ships with them. They are sold separately. The finder adds the right pack for your surface when it sizes a system, or ask us and we will match one to your roof.

Can I install it myself?

The equipment ships ready to connect, but the AC side, the grounding and any connection to the grid must be done by a licensed electrician. A grid-tied or hybrid system also needs a permit and your utility's interconnection approval before it is switched on. The wiring diagram and commissioning record we publish are for reference; they are not a stamped design, and a professional engineer's review is required where your jurisdiction calls for one.

Are the solar panels included?

Where the title names an array — “7.04 kW panels”, say — the panels are in the box and appear under What ships. A backup system whose title names no array, such as the Growatt whole-home and partial-home backup systems, is the inverter and battery only, and its listing says so. Panels for those are sold separately.

What is the difference between off-grid, grid-tie and hybrid?

An off-grid system has no utility connection: the battery carries the night and the generator input carries the dark days. A grid-tie system has no battery: it feeds your panel and the grid by day and goes dark in an outage. A hybrid system does both — it works with the grid and keeps a battery, and with its transfer switch it carries your essential circuits through an outage.

Which tax credits and incentives apply?

The 30% federal residential credit ended on 31 December 2025, and nothing on this page assumes it. Some states still run their own credits, sales-tax exemptions or generation payments; the savings estimate above lists the ones we know of for your state, and our tax credit guide explains what applies in 2026.

Can I charge from a generator?

Most off-grid inverters in the range have a generator input for charging on dark days; the specification table says whether this one does and at what current. A grid-tie inverter has no generator input. A hybrid system takes a generator through its transfer switch, if your electrician wires one in.

What if I'm not sure this is the right product?

Ask before you order. Send us what you need to run, or your pool or well figures, and an engineer will confirm the choice — it costs nothing. Or use the finder below, which sizes from what you actually run and shows its reasoning.

Not sure this is the right one? Tell the finder what you need to run and it will size it from stock, with the reasoning shown.

Size a system → Talk to an engineer