Grankia GMH445W
Grankia GMH445W
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SKU  PES-SPS-SOL-7068

Grankia GMH445W

Grankia GMH445W

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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 445W

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 GMH445W 445W Monocrystalline Monofacial Solar Panel

Model GMH445W | Monocrystalline | 120 Half-Cell | Monofacial | 1500V System Voltage

445 W
Max Power Output
20.6%
Module Efficiency
120 Cells
Monocrystalline

Product Overview

The Grankia GMH445W 445W monocrystalline solar panel delivers high power density for residential and commercial rooftops. This advanced module uses 120 half-cut monocrystalline cells to achieve up to 20.6% panel efficiency across a 430 to 455 Wp power range. A tightly controlled power tolerance of 0 to +1% supports predictable system design and stable long term returns. The module operates safely up to 1500 V system voltage, making it suitable for modern string inverter architectures. Robust EVA encapsulation, a 3.2 mm tempered glass front, and an anodized aluminium frame provide mechanical strength and weather resistance. The panel performs reliably between -40°C and 85°C, with a nominal operating temperature of 45±2°C for real world applications. Engineers and installers can use this module to build efficient arrays for homes, businesses, and distributed solar projects. Manufactured by Grankia Electric (Guangdong) Co., Ltd. in China, it offers a balanced mix of output, durability, and value. A 12 year product warranty gives additional confidence in long term performance in varied climates.

Key Benefits

High power density: The 445 Wp rated output allows more energy generation from limited roof area. This supports higher yield layouts on residential and commercial buildings.

Reliable efficiency range: Panel efficiency up to 20.6% and a power range from 430 to 455 Wp help optimise system production. Consistent performance simplifies array design and yield forecasting.

Stable performance in real conditions: Low temperature coefficients limit power loss on hot days. An operating range from -40°C to 85°C allows use in harsh and varied climates.

Durable construction: A 3.2 mm glass front, EVA encapsulant, and anodized aluminium frame protect the cells. The IP68 junction box enhances protection against dust and moisture ingress.

Flexible system integration: The 1500 V maximum system voltage and 25 A series fuse rating fit most modern string inverters. Cable length of 300 mm with 4 mm² cross section supports straightforward onsite wiring.

How It Works

This monocrystalline solar panel converts sunlight into usable direct current electricity through its 120 half cut cells. Each cell is made from high purity silicon that releases electrons when photons are absorbed. The panel wiring combines these cells so voltage and current reach optimal levels at the maximum power point. At 445 Wp, the module delivers its rated output at 34.48 V and 12.91 A under standard test conditions. An inverter then converts the generated direct current into alternating current for household or commercial loads. Excess energy can be exported or stored depending on the system design and local regulations. Temperature coefficients define how output changes as the module heats or cools in operation. Careful selection of mounting angle and array layout supports stable energy generation over the day.

Monocrystalline energy conversion: The 182×91 mm monocrystalline cells capture incoming sunlight and create charge carriers. Half cell construction helps reduce resistive losses while enabling higher string lengths and improved shade tolerance.

Maximum power point operation: At the maximum power point, voltage stabilises around 34.48 V while current reaches 12.91 A. Modern inverters track this point continuously so the panel delivers close to its 445 Wp rating whenever conditions allow.

Thermal and environmental behaviour: The nominal operating temperature of 45±2°C represents typical outdoor cell conditions. Defined temperature coefficients for Pmax, Voc, and Isc describe how power and voltage shift as the module heats or cools during daily operation.

Technical Specifications

Brand / Manufacturer Grankia Electric (Guangdong) Co., Ltd.
Country of Origin China
Model Number GMH445W
Module Type Monocrystalline, monofacial
Power Range 430 ~ 455 Wp
Maximum Power (Pmax) 445 Wp
Power Tolerance 0 ~ +1 %
Module Efficiency 20.6 % (range 19.9 ~ 21.1 %)
Voltage at Maximum Power (Vmpp) 34.48 V
Current at Maximum Power (Impp) 12.91 A
Open Circuit Voltage (Voc) 41.1 V
Short Circuit Current (Isc) 13.82 A
Maximum System Voltage 1500 V
Series Fuse Rating 25 A
Nominal Operating Cell 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
Panel Dimensions (H × W × D) 1909 × 1134 × 30 mm
Weight 23.9 kg
Cell Size 182 × 91 mm
Number of Cells 120
Front Glass Thickness 3.2 mm
Encapsulant Type EVA
Frame Material Anodized aluminium
Junction Box Diodes 3 bypass diodes
Junction Box Protection Class IP68
Cable Cross Section 4 mm²
Cable Length 300 mm

Certifications & Compliance

Certifications: Industry standard safety and performance certifications are typically applied for this class of module. Please confirm the exact certificate list with the supplier before procurement.
Inverter Compatibility: Compatible with most 1000 V and 1500 V string inverters that support monocrystalline 120 cell modules within the 430 to 455 Wp range.
Environmental: Designed for outdoor operation from -40°C to 85°C with IP68 junction box protection for demanding climates and weather conditions.
Warranty: 12 year product warranty from Grankia covering manufacturing defects, subject to the manufacturer’s standard terms and conditions.

● Available | Contact us for lead time and 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 GMH445W 445W Monocrystalline Monofacial Solar Panel

Model GMH445W | Monocrystalline | 120 Half-Cell | Monofacial | 1500V System Voltage

445 W
Max Power Output
20.6%
Module Efficiency
120 Cells
Monocrystalline

Product Overview

The Grankia GMH445W 445W monocrystalline solar panel delivers high power density for residential and commercial rooftops. This advanced module uses 120 half-cut monocrystalline cells to achieve up to 20.6% panel efficiency across a 430 to 455 Wp power range. A tightly controlled power tolerance of 0 to +1% supports predictable system design and stable long term returns. The module operates safely up to 1500 V system voltage, making it suitable for modern string inverter architectures. Robust EVA encapsulation, a 3.2 mm tempered glass front, and an anodized aluminium frame provide mechanical strength and weather resistance. The panel performs reliably between -40°C and 85°C, with a nominal operating temperature of 45±2°C for real world applications. Engineers and installers can use this module to build efficient arrays for homes, businesses, and distributed solar projects. Manufactured by Grankia Electric (Guangdong) Co., Ltd. in China, it offers a balanced mix of output, durability, and value. A 12 year product warranty gives additional confidence in long term performance in varied climates.

Key Benefits

High power density: The 445 Wp rated output allows more energy generation from limited roof area. This supports higher yield layouts on residential and commercial buildings.

Reliable efficiency range: Panel efficiency up to 20.6% and a power range from 430 to 455 Wp help optimise system production. Consistent performance simplifies array design and yield forecasting.

Stable performance in real conditions: Low temperature coefficients limit power loss on hot days. An operating range from -40°C to 85°C allows use in harsh and varied climates.

Durable construction: A 3.2 mm glass front, EVA encapsulant, and anodized aluminium frame protect the cells. The IP68 junction box enhances protection against dust and moisture ingress.

Flexible system integration: The 1500 V maximum system voltage and 25 A series fuse rating fit most modern string inverters. Cable length of 300 mm with 4 mm² cross section supports straightforward onsite wiring.

How It Works

This monocrystalline solar panel converts sunlight into usable direct current electricity through its 120 half cut cells. Each cell is made from high purity silicon that releases electrons when photons are absorbed. The panel wiring combines these cells so voltage and current reach optimal levels at the maximum power point. At 445 Wp, the module delivers its rated output at 34.48 V and 12.91 A under standard test conditions. An inverter then converts the generated direct current into alternating current for household or commercial loads. Excess energy can be exported or stored depending on the system design and local regulations. Temperature coefficients define how output changes as the module heats or cools in operation. Careful selection of mounting angle and array layout supports stable energy generation over the day.

Monocrystalline energy conversion: The 182×91 mm monocrystalline cells capture incoming sunlight and create charge carriers. Half cell construction helps reduce resistive losses while enabling higher string lengths and improved shade tolerance.

Maximum power point operation: At the maximum power point, voltage stabilises around 34.48 V while current reaches 12.91 A. Modern inverters track this point continuously so the panel delivers close to its 445 Wp rating whenever conditions allow.

Thermal and environmental behaviour: The nominal operating temperature of 45±2°C represents typical outdoor cell conditions. Defined temperature coefficients for Pmax, Voc, and Isc describe how power and voltage shift as the module heats or cools during daily operation.

Technical Specifications

Brand / Manufacturer Grankia Electric (Guangdong) Co., Ltd.
Country of Origin China
Model Number GMH445W
Module Type Monocrystalline, monofacial
Power Range 430 ~ 455 Wp
Maximum Power (Pmax) 445 Wp
Power Tolerance 0 ~ +1 %
Module Efficiency 20.6 % (range 19.9 ~ 21.1 %)
Voltage at Maximum Power (Vmpp) 34.48 V
Current at Maximum Power (Impp) 12.91 A
Open Circuit Voltage (Voc) 41.1 V
Short Circuit Current (Isc) 13.82 A
Maximum System Voltage 1500 V
Series Fuse Rating 25 A
Nominal Operating Cell 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
Panel Dimensions (H × W × D) 1909 × 1134 × 30 mm
Weight 23.9 kg
Cell Size 182 × 91 mm
Number of Cells 120
Front Glass Thickness 3.2 mm
Encapsulant Type EVA
Frame Material Anodized aluminium
Junction Box Diodes 3 bypass diodes
Junction Box Protection Class IP68
Cable Cross Section 4 mm²
Cable Length 300 mm

Certifications & Compliance

Certifications: Industry standard safety and performance certifications are typically applied for this class of module. Please confirm the exact certificate list with the supplier before procurement.
Inverter Compatibility: Compatible with most 1000 V and 1500 V string inverters that support monocrystalline 120 cell modules within the 430 to 455 Wp range.
Environmental: Designed for outdoor operation from -40°C to 85°C with IP68 junction box protection for demanding climates and weather conditions.
Warranty: 12 year product warranty from Grankia covering manufacturing defects, subject to the manufacturer’s standard terms and conditions.

● 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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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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