Off-Grid Solar Kit 12kW/15kW/18kW 120V/240V with LiFePO4 Batteries & 415W Solar Panels (SGR-18K20E)

Off Grid Solar Kit — Complete 12kW 18kW Split Phase 120V/240V System

The off grid solar kit that covers everything from the average home to the demanding cabin — the SGR-18K20E delivers 12kW, 15kW or 18kW of split-phase 120V/240V output, paired with 415W monocrystalline solar panels, 100AH 51.2V LiFePO4 lithium batteries, MPPT solar charge controllers, mounting hardware and all necessary cables in a single complete package. This is not a starter solar installation kit — it is a professional-grade, fully scalable off grid solar power system capable of running air conditioners, well pumps, refrigerators, lights, TVs, workshop equipment and light commercial loads from a single purchase.

Table of Contents

1. Kit Contents by Configuration
2. System Specifications
3. Split Phase 120V/240V Output
4. LiFePO4 Battery Storage
5. Solar Panel Specification
6. Expandability
7. What Can This System Power?
8. FAQ

Kit Contents by Configuration

SGR-12K20E (12kW):

• 1 × 12,000W 48V DC 120V/240V AC Output Inverter
• 12 × 415W Monocrystalline Solar Panels
• 5 × 100AH 51.2V LiFePO4 Battery
• 2 × 100A MPPT Solar Charge Controller
• 1 × Enclosed Battery Cabinet
• 2 Sets × 50ft Solar Extension Cables (Inverter PV Input)
• 2 Sets Cable Between Battery and MPPT Controller
• 12 Sets Mounting Z-Brackets
• 1 × 400A DC Breaker
• 2 × 25A PV Breaker

SGR-15K20E (15kW) and SGR-18K20E (18kW):

• 1 × 15,000W or 18,000W 48V DC 120V/240V AC Output Inverter
• 20 × 415W Monocrystalline Solar Panels
• 6 × 100AH 51.2V LiFePO4 Battery
• 2 × 100A MPPT Solar Charge Controller
• 1 × Enclosed Battery Cabinet
• 2 Sets × 50ft Solar Extension Cables (Inverter PV Input)
• 2 Sets Cable Between Battery and MPPT Controller
• 20 Sets Mounting Z-Brackets
• 1 × 400A DC Breaker
• 2 × 50A PV Breaker

System Specifications

Split Phase 120V/240V Output

The split-phase 120V/240V output is the defining electrical specification that makes this off grid solar system kit compatible with standard North American home wiring. Split-phase power delivers two 120V legs that combine to 240V — enabling simultaneous operation of 240V appliances (air conditioners, well pumps, electric water heaters, dryers) alongside standard 120V household loads on the same system.

This is the same electrical configuration delivered by the utility grid to most North American homes. An off grid solar power system with split-phase output replaces grid power with zero functional compromise — every outlet, appliance and circuit in the home operates exactly as it would on utility power.

For those seeking a complete kit solar energy solution that eliminates dependence on the grid without requiring any appliance changes or electrical adaptations, split-phase 120V/240V is the non-negotiable specification.

LiFePO4 Battery Storage

The 100AH 51.2V LiFePO4 batteries in this off-grid solar system packages with batteries configuration represent the current gold standard in residential energy storage chemistry.

LiFePO4 (lithium iron phosphate) batteries deliver superior cycle life — typically 2,000–6,000 charge-discharge cycles — compared to lead-acid alternatives. They maintain a flat discharge curve that keeps voltage stable throughout the discharge cycle, improving inverter efficiency and appliance performance. They operate safely without the thermal runaway risk associated with other lithium chemistries, and they charge and discharge more efficiently — retaining more of the solar energy captured by the panels rather than losing it as heat during storage.

At 51.2V nominal voltage, these batteries are directly compatible with the 48V inverter architecture — a system voltage that minimises wiring losses and maximises overall system efficiency in residential off-grid applications.

Solar Panel Specification

Each off grid solar panels complement in this kit is a 415W monocrystalline panel from Sungold — precision-engineered for maximum output and durability in the weather conditions typical of off-grid installation locations. The monocrystalline cell technology delivers high efficiency per panel area, and the robust frame construction provides the wind resistance and structural integrity required for permanent installation on homes and cabins.

The included mounting Z-brackets provide direct panel-to-roof attachment for standard composition shingles and metal roofing — no separate racking system required for most residential installations.

Expandability

One of the most important features of this off grid solar kit is its designed expandability. The system can be extended at any point by:

• Adding more batteries to increase storage capacity
• Adding more solar panels to increase daily generation
• Connecting up to 6 identical inverters in parallel for additional output in single-phase, split-phase or three-phase arrangements

This solar kits off grid approach means the initial investment does not create a capacity ceiling — the system grows with your needs rather than requiring complete replacement when energy demand increases.

What Can This System Power?

At 12kW–18kW of continuous output with 25–30kWh of battery storage, this off grid solar power kits system handles every high-demand load a North American home typically runs:

• Central air conditioning
• Well pump
• Refrigerator and freezer
• Washer and dryer
• Water heater
• Workshop tools
• Office equipment
• Lighting throughout the home
• Entertainment systems

This is a genuine solar kits solution for whole-home off-grid living — not a compromise system that forces lifestyle changes.

Explore the complete range of off-grid solar kits in our Solar Kits, Off-Grid Solar Systems and Solar Panels categories.

FAQ

What is included in this off grid solar kit? The off grid solar kit SGR-18K20E includes a 12,000W, 15,000W or 18,000W 48V split-phase inverter, 12 or 20 × 415W monocrystalline solar panels, 5 or 6 × 100AH 51.2V LiFePO4 batteries, 2 × 100A MPPT charge controllers, an enclosed battery cabinet, 50ft solar extension cables, battery-to-MPPT cables, mounting Z-brackets and DC and PV breakers — everything required for a complete off-grid solar power installation.

What is the difference between the 12kW, 15kW and 18kW configurations? The 12kW (SGR-12K20E) configuration includes 12 solar panels and 5 batteries. The 15kW (SGR-15K20E) and 18kW (SGR-18K20E) configurations include 20 solar panels and 6 batteries — producing more daily generation and storing more energy for overnight use. The 15kW and 18kW differ only in inverter output rating. Choose based on your peak load requirements and daily consumption profile.

Is this a DIY solar panel kit I can install myself? This kit is designed to simplify installation by including all necessary components — panels, inverter, batteries, cables, breakers and mounting hardware. While many experienced DIY installers complete off-grid systems without professional assistance, local electrical codes vary. Always verify your jurisdiction’s requirements for self-installed off-grid solar power systems before proceeding.

What does split phase 120V/240V mean for this off-grid solar system packages with batteries? Split-phase 120V/240V output means the inverter produces the same electrical configuration as standard North American utility power — two 120V legs combining to 240V. This allows every standard appliance, outlet and circuit in the home to operate normally on off-grid solar power, including 240V loads like air conditioners and well pumps, without any wiring modifications or appliance adaptations.

Can I expand this kit solar energy system in the future? Yes — this system is designed for expansion. Additional batteries can be added to increase storage capacity. Additional solar panels can be connected to increase daily generation. Up to 6 identical inverters can be connected in parallel to increase total output in single-phase, split-phase or three-phase arrangements. The initial purchase establishes the system foundation — expansion components can be added at any time.