How Much Do LONGi Solar Panels Cost in 2026?

Last updated: February 1, 2026

Complete LONGi solar panel pricing guide for 2026. Compare costs per watt, installation prices, and value across all LONGi models.

You've narrowed your solar panel search to LONGi — great choice. But before you sign an installer contract, you need to understand what you'll actually pay. Panel prices are just 25-35% of total system cost; installation, inverters, permitting, and overhead make up the rest. Let's break down the real numbers so you can negotiate with confidence.

LONGi offers 8 solar panel models ranging from 430W to 620W, with efficiencies between 21.6% and 23.0%. Pricing varies by distributor and installer, but LONGi panels are generally considered premium based on their specification tier. The total installed cost of a solar system using LONGi panels depends on system size, inverter choice, installation complexity, and your region.

Key Takeaways

• LONGi sells 8 panel models from 430W to 620W
• Panel pricing varies by model and installer — get 3+ quotes
• Efficiency range: 21.6%–23.0% (industry average ~21%)
• An 8 kW system with LONGi panels needs ~13 panels
• The 30% federal solar tax credit applies to all LONGi panel installations
• Total installed system cost typically runs $2.50–$3.50 per watt including labor

Quick Solar Calculator

Use this reference table to estimate your solar needs based on common home sizes:

Home Size	Est. Usage	System Size	Panels Needed	Est. Cost	After 30% ITC
1,000-1,500 sq ft	7,500 kWh/yr	5 kW	~12	$15,000	$10,500
1,500-2,000 sq ft	10,000 kWh/yr	7 kW	~16	$21,000	$14,700
2,000-2,500 sq ft	12,000 kWh/yr	8 kW	~19	$24,000	$16,800
2,500-3,500 sq ft	15,000 kWh/yr	10 kW	~23	$30,000	$21,000
3,500+ sq ft	20,000 kWh/yr	13 kW	~30	$39,000	$27,300

Formula: Panels needed = Annual kWh ÷ (Panel watts × Sun hours × 365 ÷ 1000). Using 440W avg panel, 4.5 peak sun hours. Costs at $3.00/watt national average. Full sizing guide →

LONGi Solar Panel Models

Model	Power	Efficiency	Cell Type	Warranty	Degradation
Hi-MO 7 620W	620W	23%	HPBC (Back Contact N-type)	12/30 yr	0.35%/yr
Hi-MO 7 590W	590W	22.8%	HPBC (Back Contact N-type)	12/30 yr	0.4%/yr
Hi-MO 6 580W	580W	22.3%	PERC Mono Half-cut	12/25 yr	0.5%/yr
Hi-MO X6 Max 470W	470W	22.3%	TOPCon N-type	15/30 yr	0.4%/yr
Hi-MO X6 445W	445W	22%	TOPCon N-type	12/25 yr	0.4%/yr
Hi-MO 6 Scientist 550W	550W	22%	PERC Mono	12/25 yr	0.5%/yr
Hi-MO 6 Artist 440W	440W	22%	PERC Mono	12/25 yr	0.5%/yr
Hi-MO 6 Explorer 430W	430W	21.6%	PERC Mono	12/25 yr	0.5%/yr

Sorted by efficiency. Click any model for full specifications.

Estimated System Costs with LONGi Panels

System Size	Panels Needed	Est. Cost (before ITC)	After 30% ITC
5 kW	~9 panels	$12,500–$17,500	$8,750–$12,250
8 kW	~13 panels	$20,000–$28,000	$14,000–$19,600
10 kW	~17 panels	$25,000–$35,000	$17,500–$24,500
12 kW	~20 panels	$30,000–$42,000	$21,000–$29,400

Estimates based on national average installed costs of $2.50–$3.50/watt. Actual prices vary by location, installer, and system configuration. Using Hi-MO 7 620W (620W) for panel count estimates.

Frequently Asked Questions

How much does a full LONGi solar system cost?

A complete solar system using LONGi panels typically costs $2.50–$3.50 per watt installed, depending on system size and location. For an 8 kW system (~13 LONGi panels), expect $20,000–$28,000 before the 30% federal tax credit brings the net cost to $14,000–$19,600. This includes panels, inverter, mounting hardware, permitting, and labor.

Are LONGi solar panels worth the price?

LONGi panels offer 23.0% peak efficiency with 12-year product warranties. This puts them among the higher-performing panels on the market, which can justify a premium price through greater energy production per square foot. The key is comparing the total installed cost per watt — not just the panel price — across multiple installer quotes.

What is the cheapest LONGi solar panel?

The most affordable LONGi panel is typically the lowest-wattage model in their lineup (430W at 21.6% efficiency). However, the cost per watt often decreases with higher-wattage models, so the best value may be a mid-range or higher-wattage option. Always compare the cost per watt rather than the per-panel price.

Does LONGi offer financing or leasing?

LONGi is a panel manufacturer, not an installer, so they don't directly offer financing. However, most solar installers offer multiple financing options including solar loans (typically 4–7% APR for 10–25 years), leases, and power purchase agreements (PPAs). Cash purchases give you the best long-term ROI. The 30% federal tax credit is only available with purchases or loans, not leases.

How do LONGi panels compare on price vs competitors?

LONGi panels compete in the premium efficiency tier alongside brands like Maxeon, REC, and Panasonic. Price differences between brands are typically $0.05–$0.20 per watt for panels alone, but this is a small fraction of total system cost. Focus on the installed cost per watt from your specific installer quotes.