Off-Grid Solar Kit 8kW 48V 120V/240V 20.48kWh LiFePO4 Battery 12×415W Solar Panels (SGM-8K20)

Off Grid Solar System Kit — 8kW 48V 20.48kWh 415W Complete System

The off grid solar system kit that serious DIY solar builders trust — the SGM-8K20 delivers 8kW of 120V/240V split-phase off-grid power with 12 × 415W monocrystalline solar panels, 20.48kWh of LiFePO4 battery storage and an 8kW inverter that supports up to 6-unit parallel expansion. Available in two battery configurations — four 100AH batteries or two 200AH batteries — this system is widely used across off-grid homes, cabins, emergency backup installations and light commercial applications. It is flexible, expandable and built to run washers, refrigerators, water pumps and everything in between without the compromises that undersized solar kits create.

Table of Contents

1. Kit Contents by Configuration
2. System Specifications
3. 20.48kWh Battery Storage
4. 12 × 415W Solar Array
5. Two Battery Configurations
6. Application Range
7. Expansion and Flexibility
8. FAQ

Kit Contents by Configuration

SGM-8K20 (4 × 100AH Batteries):

• 1 × 8,000W 48V DC 120V/240V AC Inverter (Up to 6 units parallel)
• 12 × 415W Monocrystalline Solar Panels
• 4 × 100AH 51.2V LiFePO4 Battery SG48100P
• 2 Sets × 50ft Solar Extension Cables (Inverter PV Input)
• 12 × Sets Mounting Z-Brackets
• 1 × 200A DC Breaker
• 2 × 25A PV Breaker

SGM-8K20T (2 × 200AH Batteries):

• 1 × 8,000W 48V DC 120V/240V AC Inverter (Up to 6 units parallel)
• 12 × 415W Monocrystalline Solar Panels
• 2 × 200AH 51.2V LiFePO4 Battery SG48200T
• 2 Sets × 50ft Solar Extension Cables (Inverter PV Input)
• 12 × Sets Mounting Z-Brackets
• 1 × 200A DC Breaker
• 2 × 25A PV Breaker

System Specifications

20.48kWh Battery Storage

At 20.48kWh, the SGM-8K20 carries the largest battery bank of any 8kW off grid solar kit in the range — nearly double the 10.24kWh storage provided by the SGK-8MAX. This additional storage capacity provides:

• Extended overnight operation before morning solar generation resumes
• Buffer for multiple consecutive cloudy days without generator backup
• Reduced depth-of-discharge per cycle — extending battery service life
• Capacity for higher daily consumption profiles without risking morning battery depletion

For off grid solar power applications in locations with variable weather, cloudy seasons or high daily consumption, the 20.48kWh storage in this off grid solar system kit is the defining specification advantage over competing 8kW systems.

12 × 415W Solar Array

The 12 × 415W monocrystalline panels deliver 4,980W of generation capacity — producing approximately 20–30kWh daily under 4–6 hours of peak sun. At this generation rate, the 20.48kWh battery bank recharges fully each day under normal conditions, maintaining the storage reserve that protects the system from load-shedding events during cloudy periods.

For buyers comparing this solar installation kit against the SGK-8MAX’s 5,400W array, the SGM-8K20’s 4,980W array sacrifices a modest amount of peak generation in exchange for significantly more battery storage — a trade-off that favours systems where overnight or multi-day storage is the priority over peak-day generation maximisation.

Two Battery Configurations

The choice between SGM-8K20 (4 × 100AH) and SGM-8K20T (2 × 200AH) delivers identical 20.48kWh storage with different physical battery arrangements:

4 × 100AH (SGM-8K20): Four smaller batteries providing wiring and management flexibility — easier to position in constrained battery enclosure locations and simpler to individually replace if a single unit requires service.

2 × 200AH (SGM-8K20T): Two larger batteries providing a simpler physical installation with fewer connections — preferred for installations where minimising battery wiring complexity is a priority.

Both configurations deliver identical system performance — the choice is purely one of physical installation preference.

Application Range

This off grid solar power kits specification is widely deployed across:

• Off-grid homes and cabins requiring full household load coverage
• Emergency backup systems requiring extended runtime without generator use
• Agricultural installations needing pump and irrigation control power
• Light commercial and industrial applications with moderate daily consumption
• Workshop and outbuilding power where grid extension is uneconomical

The 8kW inverter output and 20.48kWh storage make this one of the most versatile off grid solar systems in the residential and light commercial category.

Expansion and Flexibility

The SGM-8K20 supports up to 6 inverters in parallel — enabling output expansion to 48kW as needs grow. Additional battery banks can be added to increase storage beyond 20.48kWh. Additional panels can be connected to expand generation capacity. This kit solar off grid system is designed for systems that grow rather than systems that stagnate.

Explore additional kit configurations in our Solar Kits, Off-Grid Solar Systems and Solar Panels categories.

FAQ

What makes this off grid solar system kit different from the SGK-8MAX? The primary distinction is battery storage — the SGM-8K20 provides 20.48kWh versus the SGK-8MAX’s 10.24kWh. The solar array is slightly smaller (4,980W vs 5,400W), but the doubled storage capacity makes the SGM-8K20 significantly better suited to applications requiring extended overnight runtime, cloudy-day resilience or higher daily consumption profiles that a smaller battery bank cannot support reliably.

Is this a good DIY solar panel kit for off-grid homes? Yes — the SGM-8K20 is one of the most popular DIY solar panel kit choices for off-grid homes precisely because it balances generation, storage and output in a configuration that handles full household loads without compromise. The two battery configuration options provide installation flexibility, and the complete hardware package eliminates the component sourcing complexity that undermines many DIY solar projects.

What is the daily solar generation from this kit solar energy system? With 4,980W of solar panels and 4–6 hours of peak sun, this kit solar energy system generates approximately 20–30kWh per day — sufficient to fully recharge the 20.48kWh battery bank daily and power concurrent daytime loads from solar generation directly.

Can this solar installation kit run a whole home? Yes — at 8kW continuous output, the SGM-8K20 handles all standard residential loads simultaneously including air conditioning, well pump, refrigerator, washer, lights, entertainment and office equipment within the 8kW rating. The 20.48kWh battery provides overnight coverage for a fully equipped home through the night and into morning solar generation.

What are the two battery options for this off grid solar kit? The SGM-8K20 uses 4 × 100AH LiFePO4 batteries providing wiring flexibility and individual replaceability. The SGM-8K20T uses 2 × 200AH LiFePO4 batteries providing simpler installation with fewer connections. Both configurations deliver identical 20.48kWh total storage and identical system performance — the choice is a physical installation preference.