Quality Solar QS405-120HM12
Quality Solar QS405-120HM12
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Quality Solar QS405-120HM12

Quality Solar QS405-120HM12

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What is your return policy?

Returns are free in the first 30 days with no restocking or processing fees, although the customer may be responsible for paying return shipping. See our complete return policy on our Shipping, Delivery, and Returns page linked in the footer of this website.

What’s covered by your return policy?

Our returns policy covers all purchases made through Portlandia Electric Supply. For warranty issues, as authorized distributors, we honor the full manufacturer warranty of ALL the brands on our website. See our complete returns and warranty policies on our Shipping, Deliver, and Returns page.

How long will it take to receive my order?

All orders are processed within 72 hours and you can expect delivery on most orders within 5-7 business days. You will receive access to our customer portal after ordering, where it is easy to track all your shipments. See our Shipping, Delivery and Returns page for more details.

What are your financing and payment options?

We offer several ways to pay to make getting your solar kit simple:

Credit Card: if the purchase is greater than your card’s limit, you can split the cost onto multiple cards as well as Paypal, financing through Affirm, and ACH/bank transfer

You can arrange financing during the checkout process, or scroll further down this page for more details. Please note, if you'd like to finance your order, you can do so instantly, right at checkout.

How does your Lifetime Customer Support work?

Our legendary lifetime customer support has helped make us the #1 online solar retailer! We have a dedicated team of solar professionals standing by to help you navigate the world of solar with ease. From selecting the perfect solar kit to installation and beyond, we provide support and expertise at every step of the journey.If you need help with ordering, shipping, troubleshooting, expanding your system, warranty issues, or anything else you have questions about for as long as you own your Portlandia Electric Supply equipment, we’ve got you covered: we’re always only a phone call or email away.

QSOLAR QS405-120HM12 405W Monocrystalline Monofacial Solar Panel

Model QS405-120HM12 | Monocrystalline PERC | 120 Half-Cut Cells | Monofacial | 1500V System Voltage

405 W
Max Power Output
21.1%
Module Efficiency
120
Monocrystalline Cells

Product Overview

The QSOLAR QS405-120HM12 405W monocrystalline solar panel delivers high efficiency and stable output for residential and commercial projects. This monofacial module is built around advanced 210 mm monocrystalline cells and optimized half-cut layout. It is engineered to provide strong performance under real roof conditions where temperature and irradiance fluctuate. With a maximum panel efficiency of 21.1%, it helps reduce required roof space while maintaining excellent generation. A robust 12-year product warranty and 25-year linear power warranty support long term investment security. After 25 years, 84.8% of initial power output is still guaranteed under the manufacturer’s warranty terms. The module operates from -40°C to +85°C, making it suitable for harsh climates and demanding environments. Anti-reflective tempered glass, anodized aluminium frame, and IP68 junction box ensure durability and safe operation over time. The QS405-120HM12 sits in a broader QSOLAR MONO 210 series, covering 385 W to 665 W, ideal for scalable system design. It is produced by Ningbo Kanglite Electronics Co., Ltd. (Nexusun Energy) in China, ensuring consistent quality control. This combination of high efficiency, extended warranty, and strong mechanical design makes it a compelling choice for modern PV systems.

Key Benefits

High energy yield from limited roof space: With up to 21.1% module efficiency, more power is produced per square meter, which helps maximize energy yield on constrained roofs and commercial structures.

Reliable long term performance: A 25-year linear power warranty with only 0.55% annual degradation after year one supports dependable output. The guaranteed 84.8% power after 25 years protects long term project returns.

Robust build for harsh environments: The module withstands wind loads up to 2400 Pa and snow loads up to 5400 Pa. High salt mist and ammonia resistance supports use in coastal, agricultural, and industrial locations.

Optimized electrical design: Half cut monocrystalline cells, reduced internal mismatch loss, and lower operating temperature enhance real world efficiency. These features help stabilize output across changing weather conditions during the day.

Flexible system integration: With a 1500 V maximum system voltage and MC4 connectors, the panel integrates easily into modern string inverters and large arrays. Standard 4 mm² TUV certified cables simplify installation and system layout for installers.

How It Works

During operation, sunlight strikes the 210 mm monocrystalline solar cells, where photons are converted into direct current electricity. The QS405-120HM12 uses 120 half cut cells that reduce resistive losses and improve performance under partial shade. At standard test conditions, the module reaches a maximum power output of 405 W at a voltage of 34.4 V and current of 11.77 A. When installed outdoors, the anti reflection coated tempered glass allows more light to reach the cells while protecting them from impacts. The anodized aluminium frame and sealed IP68 junction box keep moisture and dust away from electrical parts. Generated DC power flows through integrated MC4 connectors and 4 mm² solar cables to the inverter, where it is converted to usable AC power. The panel continues to produce energy across a wide operating temperature range from -40°C up to +85°C. Over the lifetime of the system, degradation is controlled by careful materials selection and production processes, protecting long term energy yield. Paired with suitable inverters and mounting systems, the QS405-120HM12 forms the foundation of efficient rooftop or ground mounted arrays.

Monocrystalline half cut cell conversion: The module uses monocrystalline cells arranged in a 120 half cut configuration to convert solar radiation into electricity efficiently. Half cut cells reduce internal current, which decreases resistive losses and improves shade tolerance compared with full size cells.

Optical and thermal optimization: High transmission, low iron tempered glass with an anti reflection coating increases light capture across the day. A lower operating temperature and optimized temperature coefficient help maintain power output during hot weather and intense sun.

Protection, wiring, and system connection: An IP68 junction box with quality sealing keeps critical connections dry and protected from dust and humidity. Factory fitted MC4 connectors and 4 mm² cables carry DC power safely to the inverter, ensuring a secure, low loss connection inside the array.

Technical Specifications

Brand QSOLAR / Ningbo Kanglite Electronics Co., Ltd. (Nexusun Energy)
Model QS405-120HM12 (MONO 210 Series)
Cell Technology Monocrystalline, 210 x 210 mm, 10BB
Cell Count & Layout 120 half cut cells (5×12 + 5×12)
Power Range (Series) 385 Wp to 665 Wp (MONO 210 series)
Maximum Power (Pmax, STC) 405 Wp
Maximum Power (Pmax, NOCT) 306 Wp
Voltage at Pmax (Vmpp, STC) 34.4 V
Current at Pmax (Impp, STC) 11.77 A
Voltage at Pmax (Vmpp, NOCT) 32.5 V
Current at Pmax (Impp, NOCT) 9.41 A
Open Circuit Voltage (Voc, STC) 41.4 V
Open Circuit Voltage (Voc, NOCT) 38.9 V
Short Circuit Current (Isc, STC) 12.34 A
Short Circuit Current (Isc, NOCT) 9.95 A
Module Efficiency (STC) 21.1%
Panel Efficiency Range (Series) 20.9% to 21.2%
Power Tolerance 0 to +5 W (approx. 0 to +0.83%)
Operating Temperature Range -40°C to +85°C
Maximum System Voltage 1500 V DC (Application Level A)
Max Series Fuse Rating 25 A / 30 A
Front Glass 3.2 mm high transmission, low iron, tempered glass with anti reflection coating
Frame Material Anodized aluminium alloy
Dimensions (L × W × H) 1754 × 1096 × 35 mm
Weight 21.0 kg ± 3%
Junction Box Protection IP68 rated junction box
Connector Type MC4 compatible connectors
Cable Specification TÜV certified 4.0 mm² solar cable
Country of Manufacture China

Certifications & Compliance

Certifications: IEC 61215, IEC 61730, IEC 61701 (salt mist), IEC 62716 (ammonia) as stated in the MONO 210 series datasheet.
Inverter Compatibility: Compatible with most modern string and central inverters that support 1500 V DC systems and MC4 type connectors. Always confirm exact string design and operating window with your inverter datasheet or designer.
Environmental: Designed for high salt mist and ammonia resistance, suitable for coastal, agricultural, and industrial environments when installed to local standards and best practices.
Warranty: 12-year product warranty covering materials and workmanship, plus 25-year linear power warranty with first year degradation ≤ 2.0% and annual degradation ≤ 0.55% from year two, ensuring at least 84.8% of initial power output at year 25 under specified conditions.

Documentation

Product Datasheet (PDF)

● Available | Contact us for lead time and pricing

Customer Reviews

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What is your return policy?

Returns are free in the first 30 days with no restocking or processing fees, although the customer may be responsible for paying return shipping. See our complete return policy on our Shipping, Delivery, and Returns page linked in the footer of this website.

What’s covered by your return policy?

Our returns policy covers all purchases made through Portlandia Electric Supply. For warranty issues, as authorized distributors, we honor the full manufacturer warranty of ALL the brands on our website. See our complete returns and warranty policies on our Shipping, Deliver, and Returns page.

How long will it take to receive my order?

All orders are processed within 72 hours and you can expect delivery on most orders within 5-7 business days. You will receive access to our customer portal after ordering, where it is easy to track all your shipments. See our Shipping, Delivery and Returns page for more details.

What are your financing and payment options?

We offer several ways to pay to make getting your solar kit simple:

Credit Card: if the purchase is greater than your card’s limit, you can split the cost onto multiple cards as well as Paypal, financing through Affirm, and ACH/bank transfer

You can arrange financing during the checkout process, or scroll further down this page for more details. Please note, if you'd like to finance your order, you can do so instantly, right at checkout.

How does your Lifetime Customer Support work?

Our legendary lifetime customer support has helped make us the #1 online solar retailer! We have a dedicated team of solar professionals standing by to help you navigate the world of solar with ease. From selecting the perfect solar kit to installation and beyond, we provide support and expertise at every step of the journey.If you need help with ordering, shipping, troubleshooting, expanding your system, warranty issues, or anything else you have questions about for as long as you own your Portlandia Electric Supply equipment, we’ve got you covered: we’re always only a phone call or email away.

QSOLAR QS405-120HM12 405W Monocrystalline Monofacial Solar Panel

Model QS405-120HM12 | Monocrystalline PERC | 120 Half-Cut Cells | Monofacial | 1500V System Voltage

405 W
Max Power Output
21.1%
Module Efficiency
120
Monocrystalline Cells

Product Overview

The QSOLAR QS405-120HM12 405W monocrystalline solar panel delivers high efficiency and stable output for residential and commercial projects. This monofacial module is built around advanced 210 mm monocrystalline cells and optimized half-cut layout. It is engineered to provide strong performance under real roof conditions where temperature and irradiance fluctuate. With a maximum panel efficiency of 21.1%, it helps reduce required roof space while maintaining excellent generation. A robust 12-year product warranty and 25-year linear power warranty support long term investment security. After 25 years, 84.8% of initial power output is still guaranteed under the manufacturer’s warranty terms. The module operates from -40°C to +85°C, making it suitable for harsh climates and demanding environments. Anti-reflective tempered glass, anodized aluminium frame, and IP68 junction box ensure durability and safe operation over time. The QS405-120HM12 sits in a broader QSOLAR MONO 210 series, covering 385 W to 665 W, ideal for scalable system design. It is produced by Ningbo Kanglite Electronics Co., Ltd. (Nexusun Energy) in China, ensuring consistent quality control. This combination of high efficiency, extended warranty, and strong mechanical design makes it a compelling choice for modern PV systems.

Key Benefits

High energy yield from limited roof space: With up to 21.1% module efficiency, more power is produced per square meter, which helps maximize energy yield on constrained roofs and commercial structures.

Reliable long term performance: A 25-year linear power warranty with only 0.55% annual degradation after year one supports dependable output. The guaranteed 84.8% power after 25 years protects long term project returns.

Robust build for harsh environments: The module withstands wind loads up to 2400 Pa and snow loads up to 5400 Pa. High salt mist and ammonia resistance supports use in coastal, agricultural, and industrial locations.

Optimized electrical design: Half cut monocrystalline cells, reduced internal mismatch loss, and lower operating temperature enhance real world efficiency. These features help stabilize output across changing weather conditions during the day.

Flexible system integration: With a 1500 V maximum system voltage and MC4 connectors, the panel integrates easily into modern string inverters and large arrays. Standard 4 mm² TUV certified cables simplify installation and system layout for installers.

How It Works

During operation, sunlight strikes the 210 mm monocrystalline solar cells, where photons are converted into direct current electricity. The QS405-120HM12 uses 120 half cut cells that reduce resistive losses and improve performance under partial shade. At standard test conditions, the module reaches a maximum power output of 405 W at a voltage of 34.4 V and current of 11.77 A. When installed outdoors, the anti reflection coated tempered glass allows more light to reach the cells while protecting them from impacts. The anodized aluminium frame and sealed IP68 junction box keep moisture and dust away from electrical parts. Generated DC power flows through integrated MC4 connectors and 4 mm² solar cables to the inverter, where it is converted to usable AC power. The panel continues to produce energy across a wide operating temperature range from -40°C up to +85°C. Over the lifetime of the system, degradation is controlled by careful materials selection and production processes, protecting long term energy yield. Paired with suitable inverters and mounting systems, the QS405-120HM12 forms the foundation of efficient rooftop or ground mounted arrays.

Monocrystalline half cut cell conversion: The module uses monocrystalline cells arranged in a 120 half cut configuration to convert solar radiation into electricity efficiently. Half cut cells reduce internal current, which decreases resistive losses and improves shade tolerance compared with full size cells.

Optical and thermal optimization: High transmission, low iron tempered glass with an anti reflection coating increases light capture across the day. A lower operating temperature and optimized temperature coefficient help maintain power output during hot weather and intense sun.

Protection, wiring, and system connection: An IP68 junction box with quality sealing keeps critical connections dry and protected from dust and humidity. Factory fitted MC4 connectors and 4 mm² cables carry DC power safely to the inverter, ensuring a secure, low loss connection inside the array.

Technical Specifications

Brand QSOLAR / Ningbo Kanglite Electronics Co., Ltd. (Nexusun Energy)
Model QS405-120HM12 (MONO 210 Series)
Cell Technology Monocrystalline, 210 x 210 mm, 10BB
Cell Count & Layout 120 half cut cells (5×12 + 5×12)
Power Range (Series) 385 Wp to 665 Wp (MONO 210 series)
Maximum Power (Pmax, STC) 405 Wp
Maximum Power (Pmax, NOCT) 306 Wp
Voltage at Pmax (Vmpp, STC) 34.4 V
Current at Pmax (Impp, STC) 11.77 A
Voltage at Pmax (Vmpp, NOCT) 32.5 V
Current at Pmax (Impp, NOCT) 9.41 A
Open Circuit Voltage (Voc, STC) 41.4 V
Open Circuit Voltage (Voc, NOCT) 38.9 V
Short Circuit Current (Isc, STC) 12.34 A
Short Circuit Current (Isc, NOCT) 9.95 A
Module Efficiency (STC) 21.1%
Panel Efficiency Range (Series) 20.9% to 21.2%
Power Tolerance 0 to +5 W (approx. 0 to +0.83%)
Operating Temperature Range -40°C to +85°C
Maximum System Voltage 1500 V DC (Application Level A)
Max Series Fuse Rating 25 A / 30 A
Front Glass 3.2 mm high transmission, low iron, tempered glass with anti reflection coating
Frame Material Anodized aluminium alloy
Dimensions (L × W × H) 1754 × 1096 × 35 mm
Weight 21.0 kg ± 3%
Junction Box Protection IP68 rated junction box
Connector Type MC4 compatible connectors
Cable Specification TÜV certified 4.0 mm² solar cable
Country of Manufacture China

Certifications & Compliance

Certifications: IEC 61215, IEC 61730, IEC 61701 (salt mist), IEC 62716 (ammonia) as stated in the MONO 210 series datasheet.
Inverter Compatibility: Compatible with most modern string and central inverters that support 1500 V DC systems and MC4 type connectors. Always confirm exact string design and operating window with your inverter datasheet or designer.
Environmental: Designed for high salt mist and ammonia resistance, suitable for coastal, agricultural, and industrial environments when installed to local standards and best practices.
Warranty: 12-year product warranty covering materials and workmanship, plus 25-year linear power warranty with first year degradation ≤ 2.0% and annual degradation ≤ 0.55% from year two, ensuring at least 84.8% of initial power output at year 25 under specified conditions.

Documentation

Product Datasheet (PDF)

● Available | Contact us for lead time and pricing
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Customer Success Stories

Troy P

EG4 off-grid base kit, Happy with my purchase.

This is the first stage of my three planned purches. I got the eg4 inverter 6000 XP base kit with six 400 watt panels and the two server rack batteries. Did a little online research and followed the instructions and it got set up without any issues. Right now I'm just running it in my garage on a single outlet and have been running dual 750 watt water distillers with it. Once I get the second inverter and a bunch more panels and batteries, I plan on attaching it to my subpanel in my house that has my lights and outlets and appliances on it. Then I'll get a soft start for my AC and blower and run it on my main panel.

Jacob B

Easy Process, Genuine Support

Trying to pick the correct solar system for your needs can be very technical and frustrating. I wanted to thank Yvhan and the Portlandia Electric supply team for their patience and helpful attitudes through multiple calls. I feel like we were able to narrow it down to what worked for me and my family. My system works great and I couldn't be happier to have picked Portlandia Electric Supply.

Patrick B

Off Grid Solar Purchase

I wanted to get an offgrid solar system for years but didn’t know where to start. I found Portlandia Electric Supply on Facebook and decided to submit a quote. Within 24 hours I had a custom proposal that was almost half the price of the companies I had previously got quotes from. My wife and I decided to order online and the kit came in a timely manner and it was an easy install. Great company to work with!

James Martin

Highly Recommend

I would like to take the time to express the outstanding service that I was provided with by Portlandia Electric Supply. They provided me with all the answers to my questions, and after reviewing our quote over the phone I felt comfortable proceeding to order my kit. It’s exactly what I needed and they were there to help us over the phone when we had questions installing it. I highly recommend others in need to choose Portlandia Electric Supply.

Brian H

Solar Kit for Mobile Work Van

As a professional videographer, I needed reliable power on the go.Portlandia Electric Supply Delta Pro and roof-mounted panels were the perfect solution. Setup was easy, and the kit included everything needed. The Delta Pro powers my cameras, lights, laptop, and a small fridge with impressive battery capacity.

Keith S

Best Tech Support

You folks have been wonderful guiding me through the ins and outs of going solar. Plus your tech guys Rod and Nelson are the absolute best. They explained all the different aspects of inverters, batteries and how to keep them in top condition. Too much more to put here… but no other company has the 100% tech support you provide for your customers!

Coll A

Great Experience

My experience with Portlandia Electric Supply has been excellent. Before the sales, they answered all my questions to assure that I got what I needed. After the sales they continued to support me with answers and help. I had a warranty issue with a unit, and it was handled as well as possible. I would recommend them to anyone looking to go solar.

Troy P

EG4 off-grid base kit, Happy with my purchase.

This is the first stage of my three planned purches. I got the eg4 inverter 6000 XP base kit with six 400 watt panels and the two server rack batteries. Did a little online research and followed the instructions and it got set up without any issues. Right now I'm just running it in my garage on a single outlet and have been running dual 750 watt water distillers with it. Once I get the second inverter and a bunch more panels and batteries, I plan on attaching it to my subpanel in my house that has my lights and outlets and appliances on it. Then I'll get a soft start for my AC and blower and run it on my main panel.

Jacob B

Easy Process, Genuine Support

Trying to pick the correct solar system for your needs can be very technical and frustrating. I wanted to thank Yvhan and the Portlandia Electric supply team for their patience and helpful attitudes through multiple calls. I feel like we were able to narrow it down to what worked for me and my family. My system works great and I couldn't be happier to have picked Portlandia Electric Supply.

Patrick B

Off Grid Solar Purchase

I wanted to get an offgrid solar system for years but didn’t know where to start. I found Portlandia Electric Supply on Facebook and decided to submit a quote. Within 24 hours I had a custom proposal that was almost half the price of the companies I had previously got quotes from. My wife and I decided to order online and the kit came in a timely manner and it was an easy install. Great company to work with!

James Martin

Highly Recommend

I would like to take the time to express the outstanding service that I was provided with by Portlandia Electric Supply. They provided me with all the answers to my questions, and after reviewing our quote over the phone I felt comfortable proceeding to order my kit. It’s exactly what I needed and they were there to help us over the phone when we had questions installing it. I highly recommend others in need to choose Portlandia Electric Supply.

Brian H

Solar Kit for Mobile Work Van

As a professional videographer, I needed reliable power on the go.Portlandia Electric Supply Delta Pro and roof-mounted panels were the perfect solution. Setup was easy, and the kit included everything needed. The Delta Pro powers my cameras, lights, laptop, and a small fridge with impressive battery capacity.

Keith S

Best Tech Support

You folks have been wonderful guiding me through the ins and outs of going solar. Plus your tech guys Rod and Nelson are the absolute best. They explained all the different aspects of inverters, batteries and how to keep them in top condition. Too much more to put here… but no other company has the 100% tech support you provide for your customers!

Coll A

Great Experience

My experience with Portlandia Electric Supply has been excellent. Before the sales, they answered all my questions to assure that I got what I needed. After the sales they continued to support me with answers and help. I had a warranty issue with a unit, and it was handled as well as possible. I would recommend them to anyone looking to go solar.

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Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

Shop Securely, Trusted Supplier, 100% Satisfaction

Trusted Company, Real Products, Lifetime Support

Avoid Scams, Buy with Confidence, Enjoy Peace of Mind

Manufacturer Warranty, Exceptional Service

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