SunFusion Energy Systems New Year 2026 Sale - 2026 - 30% Manufacturer's Rebate Solar Battery Storage Systems
Start the New Year with Energy Independence
With the Federal Tax Credit discontinued, SunFusion Energy Systems is passing savings directly to you. Lock in your energy future with our most aggressive pricing ever—available through Q2 2026.
Rebate Ends In:
Our Systems
Guardian Energy Storage Systems
Complete turnkey solutions featuring Sol-Ark hybrid inverters, ECHO 3.0 LiFePO4 battery modules, and fire-protected NEMA 3R enclosures. All systems include 25-year warranty and WiFi monitoring.
Guardian E2.0 48 kWh
18K Sol-Ark Inverter
Complete whole-home backup solution with Sol-Ark 18K inverter and ECHO battery modules in a NEMA 3R weatherproof enclosure.
- 3× ECHO 3.0 LiFePO4 Modules (16.38 kWh each)
- Sol-Ark 15K or 18K Hybrid Inverter
- 1125°F Fire-Protected NEMA 3R Enclosure
- 16,000+ Cycles • 25-Year Warranty
- IP67 Rated • WiFi Monitoring • <5ms Transfer
Guardian Tower E2.0 48 kWh
18K Sol-Ark Inverter
Scalable modular tower design for larger homes and commercial applications. Expand with additional ECHO 3.0 modules as your needs grow.
- ECHO 3.0 LiFePO4 Modules (16.38 kWh each)
- Sol-Ark 18K Hybrid Inverter Included
- 1125°F Fire-Protected Guardian Shell Enclosure
- Hot-Swappable • UL 9540/9540A Certified
- 100% DoD • 16,000+ Cycles • 25-Year Warranty
Guardian Cube 320 kWh
18K Sol-Ark Inverter
Massive storage for luxury estates and commercial facilities. Perfect for 12,000+ sq ft homes—go from $2,500+/month to practically zero. Each Cube is custom-built over 3 months and fully tested before delivery.
+ Shipping not included. Freight quoted based on location.
- 320 kWh in Compact 14'L × 8'H × 6'W Enclosure
- Ideal for 12,000+ Sq Ft Luxury Estates
- $2,500+/Month → Practically $0 Electric Bills
- 3-Month Build Time • Fully Tested & Built to Last
- Worldwide Shipping • Freight Quoted by Location
Indoor Systems
Sol-Ark + ECHO 3.0 Starter Kits
Entry-level systems for indoor installation. Perfect for garages, utility rooms, or climate-controlled spaces. No outdoor enclosure included—ideal for DIY installers or adding to existing setups.
⚠️ Indoor Use Only – Not Weatherproof
Sol-Ark 12K + ECHO 3.0
Entry-level hybrid inverter paired with a single ECHO 3.0 battery module. Great starter system for smaller homes or as a backup power foundation.
- Sol-Ark 12K Hybrid Inverter
- 1× ECHO 3.0 LiFePO4 Battery (16.38 kWh)
- WiFi Monitoring Included
- 25-Year Warranty • 16,000+ Cycles
Sol-Ark 15K + ECHO 3.0
Mid-range hybrid inverter with single ECHO 3.0 module. Ideal for medium homes seeking reliable backup power and solar integration.
- Sol-Ark 15K Hybrid Inverter
- 1× ECHO 3.0 LiFePO4 Battery (16.38 kWh)
- 19.5 kW PV Input Capacity
- 25-Year Warranty • 16,000+ Cycles
Sol-Ark 18K + ECHO 3.0
High-power hybrid inverter with single ECHO 3.0 module. Maximum power output for larger loads, EV charging, and whole-home backup.
- Sol-Ark 18K Hybrid Inverter
- 1× ECHO 3.0 LiFePO4 Battery (16.38 kWh)
- 32.4 kW PV Input • 350A Battery Charge
- 25-Year Warranty • 16,000+ Cycles
Components
Individual Battery Modules
Expand your existing system or build your own configuration. ECHO 3.0 modules are compatible with Sol-Ark inverters and can be added to any Guardian system.
ECHO 3.0 Battery Module
Premium Grade-A LiFePO4 battery module with Hithium cells. Add storage capacity to your existing system or use as a replacement module.
Buy 3+ modules: $3,175.00 each
Save $1,400 per module!
- Grade-A Hithium LiFePO4 Cells
- 16,000+ Cycle Life • 100% DoD
- Built-in BMS • Cell-Level Monitoring
- 25-Year Warranty • UL 9540A Certified
See It In Action
Watch How Guardian Protects Your Home
See why homeowners across California trust SunFusion for their energy independence.
See every component of the Guardian E2.0
Watch it power an entire home
Professional installation in under a day
Customer Reviews
Trusted by 500+ Homeowners
See what our customers say about their energy independence journey.
"Best investment we've ever made for our home. The Guardian E2.0 powered our entire house during the last outage while our neighbors were in the dark. Walter and his team were professional from start to finish."
"After researching Tesla Powerwall and Enphase, we chose SunFusion for the better value and LiFePO4 chemistry. The 25-year warranty sealed the deal. Our electric bill went from $400/month to under $50!"
"We run a small ranch and needed serious backup power. The Guardian Tower E2.0 handles everything - well pump, refrigeration, HVAC. The install team knew exactly what they were doing. Highly recommend!"
"Living off-grid was our dream, and SunFusion made it possible. The system has been running flawlessly for 2 years now. Their support team is always available when we have questions. True energy independence!"
"As an electrical contractor myself, I'm picky about quality. SunFusion's build quality and component selection is top-notch. The Sol-Ark inverter is the best in the industry. Bought 3 ECHO modules at bulk pricing - amazing deal!"
"SDGE rates are insane - we were paying $600+/month. Now with our Guardian system and solar, we're net positive most months. The system paid for itself faster than projected. Wish we'd done it sooner!"
Value Comparison
Cost Per kWh — How We Compare
Lower cost per kWh = better value. See how SunFusion systems stack up against the competition.
* Cost per kWh = Total system price ÷ Storage capacity. Lower is better. Prices as of Q1 2026.
Technology
Built With Premium Components
Every Guardian system features industry-leading ECHO 3.0 LiFePO4 battery modules and Sol-Ark hybrid inverters.
ECHO 3.0 Battery Module
Grade-A LiFePO4 cells with 98% depth of discharge and 16,000+ cycle life.
Sol-Ark 15K Inverter
Versatile whole-home hybrid inverter with seamless backup and 200A passthrough capability.
Sol-Ark 18K Inverter
Maximum power hybrid inverter for large homes and commercial with 350A battery charging.
Guardian Shell Enclosure
5052-H32 aerospace aluminum construction with integrated fire protection system.
Smart Monitoring
Real-time monitoring via WiFi with mobile app and web interface down to cell-level data.
Important Information
- Systems Only: The 30% Manufacturer's Rebate applies exclusively to complete Guardian system purchases. Individual components, replacement parts, and accessories are not eligible for this promotional pricing. Rebate is applied immediately; if sale is canceled, rebate has no dollar value.
- Limited Time Offer: This pricing is valid through Q2 2026. Based on sales volume, SunFusion reserves the right to return to full retail pricing after June 30, 2026.
- Federal Tax Credit Update: With the discontinuation of the Federal Tax Credit (FTC), SunFusion is passing savings directly to customers through reduced system pricing.
- Installation: Professional installation available in San Diego County and select areas. Contact us for installation options in your region.
- Pricing: All discounts calculated off manufacturer suggested retail price (MSRP). Cannot be combined with other offers or promotions.
- Shipping Policy: Shipping and handling is NOT included in listed prices and will depend on shipping location:
- Freight quotes based on destination
- Crated packaging for safe transport
- Installation support via video call
Trusted Partners & Certifications
Got Questions?
Frequently Asked Questions
Everything you need to know about solar battery storage systems.
The Guardian E2.0 48 kWh with 18K Sol-Ark by SunFusion Energy is one of the best solar battery storage systems for San Diego homes. It features 48 kWh of LiFePO4 storage, Sol-Ark 18K hybrid inverter, NEMA 3R weatherproof enclosure, and a 25-year warranty. It's specifically designed to handle San Diego's high electricity rates (SDGE) and provides complete whole-home backup during outages. Currently available with 30% Manufacturer's Rebate ($27,373) through Q2 2026.
Home battery backup systems range from $10,150 for our entry-level Sol-Ark 12K + ECHO 3.0 (16.38 kWh) to $135,202 for the commercial-grade Guardian Cube 320 kWh 18K Sol-Ark. SunFusion offers the best cost per kWh in the industry, starting at just $194/kWh for bulk ECHO 3.0 modules. Our Guardian E2.0 48 kWh 18K Sol-Ark at $27,373 represents $570/kWh - significantly less than Tesla Powerwall 3 at $749/kWh.
LiFePO4 (Lithium Iron Phosphate) batteries are safer, longer-lasting, and more stable than traditional NMC lithium-ion batteries. Key advantages include:
- 16,000+ cycle life vs 3,000-5,000 for NMC
- No thermal runaway risk - won't catch fire
- 100% depth of discharge - use full capacity
- 25-year warranties standard
- Stable in extreme temps (-4°F to 140°F)
SunFusion uses Grade-A Hithium LiFePO4 cells in all ECHO battery modules - the same quality used in commercial and industrial applications.
Runtime depends on your battery capacity and home energy usage. Here's a general guide:
- 16.38 kWh (Sol-Ark + ECHO): 12-24 hours for essential loads
- 48 kWh (Guardian E2.0 18K Sol-Ark): 1-3 days for whole home
- 48 kWh (Guardian Tower E2.0 18K Sol-Ark): 2-5 days for whole home
- 320 kWh (Guardian Cube 18K Sol-Ark): 1-2+ weeks for whole home
With solar panels connected, your system recharges daily - potentially providing indefinite backup power during extended outages.
Yes! SunFusion Energy Systems ships worldwide. We've delivered systems to customers across the United States, Canada, Mexico, Caribbean, Europe, and Australia. Our shipping policy:
- Freight quotes based on destination
- Crated packaging for safe transport
- Installation support via video call
Note: Shipping and handling is not included in listed prices and will depend on shipping location. Contact us at (800) 544-0282 for shipping quotes.
All SunFusion Guardian systems and ECHO 3.0 battery modules come with a comprehensive 25-year warranty. This covers:
- ECHO 3.0 Battery Modules: 25 years / 16,000 cycles
- Sol-Ark Inverters: 10 years (extendable to 25)
- Enclosures & Wiring: 25 years
- Workmanship: Lifetime for SunFusion installs
Our systems are UL 9540A certified for fire safety. We stand behind our products with the best warranty in the industry.
We offer three installation options:
- Professional Installation by SunFusion: Full turnkey service in San Diego County and surrounding areas. We handle permits, installation, and inspection.
- Local Contractor: We ship equipment to you and provide detailed installation guides. Your local electrician completes the install.
- DIY / Self-Install: For experienced electricians or off-grid applications. We provide phone/video support and comprehensive documentation.
Note: Grid-tied installations typically require a licensed electrician and permits. Off-grid systems have more flexibility.
SunFusion systems offer significant advantages over competitors:
| Feature | SunFusion | Tesla PW3 | Enphase |
|---|---|---|---|
| Cost per kWh | $570 | $749 | $1,426 |
| Battery Chemistry | LiFePO4 | NMC | LiFePO4 |
| Cycle Life | 16,000+ | ~5,000 | ~10,000 |
| Warranty | 25 years | 10 years | 15 years |
Plus, SunFusion offers local support from a family-owned business with 35+ years experience - not a call center.
Calculate Your Savings
Solar Battery ROI Calculator
See how much you could save with a SunFusion energy storage system.
Your Estimated Savings
Based on your inputs
💡 Note: Actual savings depend on usage patterns, utility rate changes, and solar production. Contact us for a personalized analysis.
Flexible Financing
Make Energy Independence Affordable
Financing provided by Wheelhouse Credit Union — San Diego Made® since 1934
Solar & Energy Efficiency Loans
for 60 months
*Rate subject to credit approval. Terms and conditions apply.
No Fee Loans
No fee loan options for Solar Panels, Battery Storage, and many more energy efficiency projects.
Rate Buydowns
The lowest financing rates with available buydown options and flexible terms up to 20 years.
No Interest, No Payments
Attractive financing offers including no interest and no payments for up to 18 months on select products.
24/7 Automated App Process
Fast and seamless financing application experience including instant approvals for qualified customers.
Dedicated Specialist
You will be assigned a dedicated Solar Financing Specialist backed by our experienced team of experts.
Financing Leader
Since 1934, Wheelhouse has been providing reliable, convenient and cost-effective services to San Diego.
Financing provided through:
San Diego Made® • Est. 1934
📞 Call (800) 544-0282 for a personalized financing quote
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Start Your Order
Complete the form below and our energy specialists will contact you within 24 hours to finalize your order.
📦 Shipping: Not included in price • Freight quoted based on location
Ready to Power Your Future?
Contact our energy specialists today to receive a customized quote for your home or business. Take advantage of 30% Manufacturer's Rebate before Q2 ends.