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If you’re shopping for the Longi 585 Watt Solar Panel Price in USA, you’re probably comparing high-output modules for a home, business, farm, or commercial project. Price matters, but it’s only one piece of the puzzle — efficiency, warranty, durability, and long-term energy output all factor into real value.
This panel sits in the high-power category, built for large rooftop systems and ground-mounted arrays where each module needs to pull more weight. Knowing what you’re actually paying for helps you compare quotes with confidence instead of guessing.
What Is the LONGi 585W Solar Panel?
The LONGi 585W panel belongs to the company’s Hi-MO product family. Depending on the market and supplier, you’ll see it listed under model numbers like LR5-72HTH-585M or LR5-72HGD-585M. Both use n-type TOPCon cell technology, which improves efficiency and slows down performance loss compared to older p-type designs.
N-type cells handle heat better and degrade more slowly year over year — meaning the panel keeps producing closer to its rated output as it ages. For anyone planning a system meant to last 25+ years, that’s not a minor detail.
You’ll also find this panel in monofacial and bifacial versions. Monofacial collects light only from the front. Bifacial collects light from both sides, picking up extra energy from sunlight reflected off the ground — useful for white gravel, light-colored rooftops, or snowy regions.
Key Specifications at a Glance
This panel pairs high efficiency with a large-format design, so fewer panels can hit your target system size.
Typical specs include:
- Rated power around 585W under Standard Test Conditions
- Module efficiency around 22.6%
- N-type TOPCon cells
- Dimensions of roughly 2278 × 1134 × 30-35mm
- Weight between 27-32 kg depending on the model
- 15-year product warranty, 25-year performance warranty (guaranteeing at least 91.3% output after 25 years)
Real-world output drops a bit under Normal Operating Cell Temperature compared to lab conditions — that’s normal for any panel. The LONGi 585W still holds up well thanks to its efficient cell design and favorable temperature coefficient.
You’ll also get a durable aluminum frame, tempered glass, a weatherproof junction box, and IP-rated protection for year-round outdoor use.
LONGi 585W Solar Panel Price in the USA
Here’s where most buyers want a straight answer, and it does vary depending on the source.
Based on current market data, LONGi panels generally run between $0.42 and $0.85 per watt in 2026. For context, that puts a typical 6kW system around $3,300 to $5,100 before the 30% federal tax credit. Applied to a single 585W panel, that range works out to roughly $245 to $497 per unit — though bulk and wholesale buyers can often land below that, especially with pallet-quantity orders (most suppliers sell in 36-panel pallets).
A few things worth knowing:
- Residential buyers typically pay more per panel than commercial or bulk buyers
- Wholesale/pallet pricing brings the per-unit cost down meaningfully
- The panel price is just one line item — a full installed system adds mounting hardware, wiring, inverter, labor, permits, and inspection fees
If two quotes for the same panel look wildly different, the gap is usually installation and overhead, not the module itself.
Factors That Affect the Price You Pay
A handful of variables move the needle on what you’ll actually pay:
- Glass type: Glass-glass construction (tempered glass on both sides) costs more than glass-backsheet, but holds up better against moisture and wear.
- Monofacial vs. bifacial: Bifacial panels cost more upfront but can pay that back through extra energy yield in the right setting.
- Order size: Bulk and pallet purchases bring meaningfully better per-watt pricing than single-panel orders.
- Shipping: A panel this large and heavy isn’t cheap to freight, especially in small quantities.
- Local incentives: State rebates and federal tax credits don’t change the panel price, but they do change what you actually end up paying out of pocket for the full system.
Why Choose the LONGi 585W Panel
LONGi has built a strong reputation through consistent manufacturing and heavy investment in efficiency gains.
The higher wattage means fewer panels for the same system size, which trims down mounting hardware, wiring, and install time. That’s especially useful where roof space is tight each panel is doing more work.
Durability backs this up too. LONGi backs its panels with 15-year product warranties and 25-year performance warranties, guaranteeing at least 91.3% output after 25 years. The bifacial versions add another layer of value for commercial sites where ground reflection can meaningfully boost yearly output.
How It Compares to Other High-Wattage Panels
The 585W LONGi competes against similar offerings from Trina Solar, JA Solar, Canadian Solar, JinkoSolar, and Risen Energy most landing in the same 580-590W, ~22%+ efficiency range.
The real differences tend to show up in warranty terms, degradation rates, and pricing rather than dramatic efficiency gaps. LONGi sits in the mid-range tier, rated 4.3/5 by industry sources — a reasonable middle ground for buyers who want quality without paying premium-brand prices for marginal performance differences.
For most commercial projects, installers weigh total system cost over small efficiency edges between competing brands.
This is something we cover in detail in our guide on LONGI VS JINKO Solar Panels
How to Verify Authenticity Before You Buy
Counterfeit and grey-market panels show up often enough that it’s worth checking before you pay:
- Verify the serial number through LONGi directly
- Match the factory label specs against the official datasheet
- Ask for original warranty documentation
- Be cautious of prices well below typical market range
- Buy through authorized distributors when possible
A legitimate seller should answer technical questions without hesitation and hand over documentation before you pay not after.
Installation and Long-Term Value
These panels are larger than most residential modules, so installation needs proper planning roof structure, wind loading, wiring gauge, inverter compatibility, and mounting all need to check out before work starts.
Large commercial roofs, warehouses, agricultural buildings, and ground-mount systems get the most benefit from high-wattage modules like this one fewer panels, simpler wiring, and the same (or better) total output.
Your actual return depends on local electricity rates, sun hours, install quality, and available incentives. Higher-efficiency panels tend to pay themselves off faster simply because they’re producing more per square foot over the system’s lifetime.
FAQs
Is the LONGi 585W panel suitable for homes
Yes, for homes with enough roof space. Have your installer confirm structural compatibility first.
Does the bifacial version produce more electricity?
Yes, output increases when light reflects onto the rear side from bright ground surfaces.
How long does a LONGi 585W panel last?
Most installations run well past 25 years, with gradual, slow power loss over that span.
Is buying a single panel cheaper than buying a pallet?
No, bulk and pallet orders almost always come with better per-panel pricing.
Does the panel price include installation?
No. Panel pricing covers the module only labor, mounting, wiring, inverter, and permits are separate.
