Design Your Solar + Battery System
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Your Custom System Recommendation
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Recommended System Packages
Pre-engineered solutions for your needs
- Solar calculations assume optimal roof orientation (south-facing) and minimal shading
- Battery sizing includes 20% reserve for system efficiency and degradation
- Backup duration based on reduced "critical loads" (~60% of normal usage)
- Actual performance varies based on weather, usage patterns, and system configuration
- Final pricing subject to site survey and engineering review
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Advanced Analysis Results
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What-If Scenarios
Explore how different situations affect your system needs
Impact: +20-40 kWh/day depending on driving
Recommendation: Add 6-8 kW of solar capacity and 15-20 kWh of battery storage. Schedule charging during super off-peak rates (11PM-6AM at ~$0.15/kWh).
Pro Tip: Size your system now for future EV - it's 30-40% cheaper than upgrading later.
Challenge: Multi-day planned power shutoffs in fire-prone areas like Ramona and Fallbrook.
Recommendation: Size battery for 48-72 hours autonomy (65-98 kWh). Guardian Shell's 1125° fire rating provides critical protection.
SDG&E averages 3-5 PSPS events annually in backcountry areas.
Opportunity: Buy low, use high with battery storage.
Strategy: Charge at $0.15/kWh (11PM-6AM), discharge at $0.93/kWh (4-9PM). That's $0.78/kWh profit per cycle.
A 49 kWh battery cycling daily saves $2,500+/year on arbitrage alone!
Impact: Pool pump adds 10-15 kWh/day, heating can double that.
Recommendation: Add 3-4 kW solar. Use variable speed pumps during peak solar hours. Consider solar thermal for pool heating instead of electric.
Challenge: A/C running 24/7 during heat waves can use 60-80 kWh/day.
Recommendation: Sol-Ark 18K handles high surge loads. Size battery for overnight A/C operation (25-30 kWh minimum).
Mini-split heat pumps are 30-40% more efficient than central A/C.
Priority: Absolute reliability required for CPAP, oxygen, dialysis, etc.
Recommendation: Oversize battery by 50-100%. Sol-Ark's 5ms transfer time is medical-grade UPS quality. Add generator backup for extended outages.
Guardian Shell's fire protection is critical for home medical safety.
Reality: SDG&E rates have increased 7-10% annually for the past decade.
Value: A system breaking even in 6 years at today's rates may break even in 4 years with continued increases. Solar + storage = energy cost insurance.
Lock in your energy costs for 25+ years.
Challenge: Export rates dropped from ~$0.30/kWh to ~$0.05-0.08/kWh.
Strategy: Battery storage is now ESSENTIAL. Store excess solar for evening use rather than exporting to grid at low rates.
Self-consumption is 3-5x more valuable than grid export under NEM 3.0.
Impact: +15-25% daily usage, but more during solar production hours.
Silver Lining: Better solar utilization since you're home during peak production. May need less battery since daytime loads absorb solar directly.
Reliable power becomes mission-critical for video calls!
Frequently Asked Questions
Common questions about solar + storage systems
Yes, when designed properly.
Our ECHO battery modules use LiFePO4 (Lithium Iron Phosphate) chemistry - fundamentally different from the lithium-ion batteries in phones/laptops that make headlines:
- LiFePO4 Chemistry: Most stable lithium chemistry. No thermal runaway below 518°F - standard lithium-ion starts at 302°F
- Guardian Shell Housing: 1125° fire-rated enclosure provides multiple hours of protection
- Multi-Level BMS: Monitors every cell, preventing overcharge, over-discharge, and temperature excursions
- UL Certifications: UL9540, UL9540A (fire propagation), and UL1973 certified
Your system is safer than the gas tank in your car or the natural gas line to your home.
ECHO 3.0: 6,000+ cycles at 80% DOD = 25+ year calendar life
- Cycle Life: 6,000+ full cycles. At 1 cycle/day, that's 16+ years of cycles available
- Calendar Life: 25+ years before capacity drops below 80%
- Real Usage: Most homes partial-cycle (20-60% DOD), extending life significantly
- Round-Trip Efficiency: ≥96% — more of your stored energy is available
Warranty: 25-year warranty — the best in the industry.
SunFusion is currently offering a 30% Manufacturer's Rebate on all Guardian systems and Sol-Ark kits.
This limited-time rebate significantly reduces your system cost:
- Guardian E2.0 48 kWh: $39,104 → $27,373 (save $11,731)
- Guardian Tower: $46,014 → $32,210 (save $13,804)
- Sol-Ark 15K + ECHO: $16,500 → $11,550 (save $4,950)
- ECHO 3.0 Bulk (3+): $4,575 → $3,175 per module
Why the rebate? SunFusion wants to make energy independence accessible to more families. This rebate won't last forever, so contact us to lock in your savings.
Note: The federal ITC for residential solar has expired, but this manufacturer rebate provides comparable savings.
Battery capacity + load management = days of autonomy
Example: Guardian E2.0 (49 kWh) during 3-day storm:
- Day 1: Critical loads only (5 kW avg) = 41 kWh remaining
- Day 2: Partial solar (20%) + critical loads = 29 kWh remaining
- Day 3: Minimal solar + reduced loads = 12 kWh remaining
- Day 4: Storm clears, solar recharges battery ☀️
Strategies: Sol-Ark auto-starts generator at 20% battery. Even cloudy days produce 10-30% rated capacity.
Pro tip: Guardian Tower (65-98 kWh) provides 4-7 days autonomy with zero solar.
Yes, with smart load management.
Sol-Ark inverter capabilities:
- Sol-Ark 15K: 15kW continuous, 24kW surge (10 sec)
- Sol-Ark 18K: 18kW continuous, 36kW surge (10 sec)
Common loads: Central A/C (3-5 kW running, 8-10 kW startup), Electric Dryer (3-5 kW), EV Charger (7.2 kW), Water Heater (4-5 kW).
Sol-Ark's smart load management sequences high-power loads to avoid simultaneous startup. You may need to avoid running ALL high-power items at once during an outage.
No. Buy when you need it, not when it's "perfect."
- Waiting game: Costs dropped 85% since 2010. Future drops will be incremental (2-5%/year)
- Rising rates: You're paying 7-10% more annually while waiting - that adds up fast
- Current tech: LiFePO4 is proven, safe, and lasts 25+ years
- Financing: Monthly loan payments can be less than your current electric bill
Math check: System saving $5,000/year. Wait 2 years for 10% price drop ($5,000 savings), but lose $10,000 in utility bills. Net loss: $5,000. Plus rates keep rising.
Very little - these are "set and forget" systems.
- Solar panels: Rain naturally cleans. Optional manual cleaning 1-2x/year in dusty areas. 25-year warranty.
- Batteries: Zero maintenance - solid-state, no moving parts. BMS handles balancing automatically. Remote monitoring.
- Inverter: Filter cleaning 1x/year (5 min). Fan replacement every 10-15 years (~$200). 10-year warranty (extendable to 25).
Total annual effort: ~1 hour of your time, $0 in most years.
Replace your roof BEFORE installing solar.
- Don't: Install on old roof - removal/reinstall costs $5,000-8,000 later
- Do: Fresh roof + solar = no worries for 25+ years
- Asphalt shingles: Don't install solar if >15 years old
- Tile/metal: Can install even on older roofs (50+ year life)
Some installers partner with roofers for combined quotes. You can finance both together.
Typical timeline: 8-12 weeks from contract to power-on
- Week 1-2: Design, engineering, permit applications
- Week 3-8: Permit review (varies wildly by jurisdiction - this is the bottleneck)
- Week 9-10: Physical installation (3-5 days actual work)
- Week 11-12: City inspection, utility meter swap, PTO granted
Pro tip: Schedule your installation before summer to avoid peak season delays and be ready for wildfire/PSPS season.
CA Contractor License #1053778 | C-10 Electrical
(858) 217-8861 | info@sunfusion.us
Solar & Battery System Estimate
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💡 Financing Options Available
Low-interest solar loans can make your monthly payment less than your current electric bill. Contact us to explore financing options.
Disclaimer: This estimate is for planning purposes only. Final pricing subject to site survey, engineering review, permitting costs, and current material pricing. Savings estimates based on current utility rates and assume 5% annual rate increases. Contact us about available state and local incentives.