Grankia GMH455W
Grankia GMH455W
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SKU  PES-SPS-SOL-7070

Grankia GMH455W

Grankia GMH455W

OEM Authorized Dealer BABA Compliant Full OEM Warranty 7-10 Business Day Delivery

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truck
In Stock

Get yours today!

truck
9+ sold

In the last 7 days

truck
Flat Rate Shipping - Calculated at Checkout

Delivery timeframe shown above at checkout

Lifetime Customer Support

Unlimited lifetime support, always available.

In High Demand! Order Now To Secure Your Items

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Specifications

Power Rating 455W

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.

Grankia GMH455W 455W Monocrystalline Monofacial Solar Panel

Model GMH455W | Monocrystalline | 120 Half-Cell | Monofacial | 1500 V System Voltage

455 Wp
Max Power Output
21.1%
Module Efficiency
120 Cells
Monocrystalline Half-Cell

Product Overview

The Grankia GMH455W 455W monocrystalline solar panel delivers reliable high power for residential and commercial arrays. With a rated maximum power of 455 Wp and panel efficiency up to 21.1%, this module is designed to harvest more energy from limited roof space. Advanced monocrystalline half cells, combined with a durable anodized aluminium frame and 3.2 mm tempered glass, help ensure strong performance in demanding outdoor conditions. An operating temperature range from -40°C to 85°C supports installations in both hot and cold climates. The panel is engineered for systems up to 1500 V, making it suitable for modern string inverters and larger arrays. A 12-year product warranty provides long term peace of mind, while a tight positive power tolerance from 0 to +1% supports accurate system design and dependable output.

Key Benefits

High power density for limited roof space: The 455 Wp output and up to 21.1% efficiency enable more energy from fewer modules, ideal where roof or ground space is constrained.

Reliable monocrystalline half-cell design: High quality 182 × 91 mm monocrystalline cells in a 120 half-cell layout support stable performance, improved current handling and reduced resistive losses.

Robust build for harsh environments: An anodized aluminium frame, EVA encapsulant and 3.2 mm glass provide strong mechanical strength and long term resistance to wind, snow and UV exposure.

Stable performance across temperatures: Optimized temperature coefficients for power, voltage and current support better real world yields in both hot and cold climates over the module lifetime.

Flexible system integration: Compatibility with 1500 V systems, a 25 A series fuse rating and 4 mm² cables simplifies design for residential, commercial and light industrial installations.

Trusted manufacturer and global supply: Produced by Grankia Electric (Guangdong) Co., Ltd. in China, the panel supports projects that require dependable manufacturing and scalable production capacity.

How It Works

This monocrystalline solar panel converts sunlight into direct current electricity through its 120 high efficiency cells. When the sun hits the cell surface, photons transfer energy to electrons in the silicon, creating electrical current. The 455 Wp rating is defined under standard test conditions, helping system designers predict array production. During operation, the panel works at its maximum power point, balancing voltage and current to maximize output. Integrated bypass diodes in the IP68 junction box help reduce power loss in partial shading. The generated DC electricity is then routed through system cabling to an inverter, where it is converted into usable AC power for homes or businesses or directed to battery storage systems.

Monocrystalline cell energy conversion: Each 182 × 91 mm monocrystalline cell is made from high purity silicon that supports efficient electron flow. Sunlight excites electrons within the cell structure, and the internal electric field directs them into an external circuit, creating current for your solar system.

Maximum power point operation: Under standard conditions, the module delivers 34.87 V at 13.05 A at its maximum power point. Inverter electronics continuously track this point so the panel operates near its ideal voltage and current, improving system yield throughout the day.

Thermal and environmental management: The typical cell operating temperature of 45±2°C and tuned temperature coefficients limit performance loss during hot weather. Durable EVA encapsulation, tempered glass and a sealed IP68 junction box protect electrical connections from moisture, dust and mechanical stress over many years.

Technical Specifications

Brand Grankia Electric (Guangdong) Co., Ltd.
Model Number GMH455W
Cell Technology Monocrystalline silicon
Cell Size 182 × 91 mm
Number of Cells 120 half cells
Power Range 430 – 455 Wp
Maximum Power (Pmax) 455 Wp
Power Tolerance 0 ~ +1 %
Module Efficiency 19.9 – 21.1 %
Voltage at Maximum Power (Vmpp) 34.87 V
Current at Maximum Power (Impp) 13.05 A
Open Circuit Voltage (Voc) 41.4 V
Short Circuit Current (Isc) 13.97 A
Normal Cell Operating Temperature 45 ± 2 °C
Operating Temperature Range -40 ~ 85 °C
Temperature Coefficient of Pmax -0.35 %/°C
Temperature Coefficient of Voc -0.276 %/°C
Temperature Coefficient of Isc 0.046 %/°C
Maximum System Voltage 1500 V
Series Fuse Rating 25 A
Panel Dimensions (H × W × D) 1909 × 1134 × 30 mm
Weight 23.9 kg
Front Glass Thickness 3.2 mm tempered glass
Encapsulant EVA (ethylene-vinyl acetate)
Frame Material Anodized aluminium
Junction Box Protection Class IP68 with 3 bypass diodes
Cable Cross Section 4 mm²
Cable Length 300 mm
Country of Origin China

Certifications & Compliance

Certifications: Standard international IEC and safety certifications are typically supported for grid connected projects. Please confirm exact certificates with the latest manufacturer datasheet.
Inverter Compatibility: Suitable for most modern string and hybrid inverters rated for 1500 V DC systems, when designed within electrical limits.
Environmental: Designed for outdoor rooftop and ground mount use, with IP68 junction box and durable materials supporting long term weather resistance.
Warranty: 12-year product warranty on materials and workmanship, with performance coverage according to the manufacturer’s current warranty policy.

● Available | Contact us for lead time and project specific pricing

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)

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.

Grankia GMH455W 455W Monocrystalline Monofacial Solar Panel

Model GMH455W | Monocrystalline | 120 Half-Cell | Monofacial | 1500 V System Voltage

455 Wp
Max Power Output
21.1%
Module Efficiency
120 Cells
Monocrystalline Half-Cell

Product Overview

The Grankia GMH455W 455W monocrystalline solar panel delivers reliable high power for residential and commercial arrays. With a rated maximum power of 455 Wp and panel efficiency up to 21.1%, this module is designed to harvest more energy from limited roof space. Advanced monocrystalline half cells, combined with a durable anodized aluminium frame and 3.2 mm tempered glass, help ensure strong performance in demanding outdoor conditions. An operating temperature range from -40°C to 85°C supports installations in both hot and cold climates. The panel is engineered for systems up to 1500 V, making it suitable for modern string inverters and larger arrays. A 12-year product warranty provides long term peace of mind, while a tight positive power tolerance from 0 to +1% supports accurate system design and dependable output.

Key Benefits

High power density for limited roof space: The 455 Wp output and up to 21.1% efficiency enable more energy from fewer modules, ideal where roof or ground space is constrained.

Reliable monocrystalline half-cell design: High quality 182 × 91 mm monocrystalline cells in a 120 half-cell layout support stable performance, improved current handling and reduced resistive losses.

Robust build for harsh environments: An anodized aluminium frame, EVA encapsulant and 3.2 mm glass provide strong mechanical strength and long term resistance to wind, snow and UV exposure.

Stable performance across temperatures: Optimized temperature coefficients for power, voltage and current support better real world yields in both hot and cold climates over the module lifetime.

Flexible system integration: Compatibility with 1500 V systems, a 25 A series fuse rating and 4 mm² cables simplifies design for residential, commercial and light industrial installations.

Trusted manufacturer and global supply: Produced by Grankia Electric (Guangdong) Co., Ltd. in China, the panel supports projects that require dependable manufacturing and scalable production capacity.

How It Works

This monocrystalline solar panel converts sunlight into direct current electricity through its 120 high efficiency cells. When the sun hits the cell surface, photons transfer energy to electrons in the silicon, creating electrical current. The 455 Wp rating is defined under standard test conditions, helping system designers predict array production. During operation, the panel works at its maximum power point, balancing voltage and current to maximize output. Integrated bypass diodes in the IP68 junction box help reduce power loss in partial shading. The generated DC electricity is then routed through system cabling to an inverter, where it is converted into usable AC power for homes or businesses or directed to battery storage systems.

Monocrystalline cell energy conversion: Each 182 × 91 mm monocrystalline cell is made from high purity silicon that supports efficient electron flow. Sunlight excites electrons within the cell structure, and the internal electric field directs them into an external circuit, creating current for your solar system.

Maximum power point operation: Under standard conditions, the module delivers 34.87 V at 13.05 A at its maximum power point. Inverter electronics continuously track this point so the panel operates near its ideal voltage and current, improving system yield throughout the day.

Thermal and environmental management: The typical cell operating temperature of 45±2°C and tuned temperature coefficients limit performance loss during hot weather. Durable EVA encapsulation, tempered glass and a sealed IP68 junction box protect electrical connections from moisture, dust and mechanical stress over many years.

Technical Specifications

Brand Grankia Electric (Guangdong) Co., Ltd.
Model Number GMH455W
Cell Technology Monocrystalline silicon
Cell Size 182 × 91 mm
Number of Cells 120 half cells
Power Range 430 – 455 Wp
Maximum Power (Pmax) 455 Wp
Power Tolerance 0 ~ +1 %
Module Efficiency 19.9 – 21.1 %
Voltage at Maximum Power (Vmpp) 34.87 V
Current at Maximum Power (Impp) 13.05 A
Open Circuit Voltage (Voc) 41.4 V
Short Circuit Current (Isc) 13.97 A
Normal Cell Operating Temperature 45 ± 2 °C
Operating Temperature Range -40 ~ 85 °C
Temperature Coefficient of Pmax -0.35 %/°C
Temperature Coefficient of Voc -0.276 %/°C
Temperature Coefficient of Isc 0.046 %/°C
Maximum System Voltage 1500 V
Series Fuse Rating 25 A
Panel Dimensions (H × W × D) 1909 × 1134 × 30 mm
Weight 23.9 kg
Front Glass Thickness 3.2 mm tempered glass
Encapsulant EVA (ethylene-vinyl acetate)
Frame Material Anodized aluminium
Junction Box Protection Class IP68 with 3 bypass diodes
Cable Cross Section 4 mm²
Cable Length 300 mm
Country of Origin China

Certifications & Compliance

Certifications: Standard international IEC and safety certifications are typically supported for grid connected projects. Please confirm exact certificates with the latest manufacturer datasheet.
Inverter Compatibility: Suitable for most modern string and hybrid inverters rated for 1500 V DC systems, when designed within electrical limits.
Environmental: Designed for outdoor rooftop and ground mount use, with IP68 junction box and durable materials supporting long term weather resistance.
Warranty: 12-year product warranty on materials and workmanship, with performance coverage according to the manufacturer’s current warranty policy.

● Available | Contact us for lead time and project specific 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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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

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

Be Smart, Buy From an Authorized Dealer

When you choose Portlandia Electric Supply, you’re buying real products from a trusted company with established supplier relationships. Enjoy peace of mind with 100% manufacturer warranty coverage and lifetime customer support. In an age where online shopping is fraught with risks, it’s crucial to avoid fly-by-night websites that skirt regulations. Shop with confidence, knowing you’re getting genuine quality and reliable service.

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