Grankia GMH440W
Grankia GMH440W
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Grankia GMH440W

Grankia GMH440W

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9+ sold

In the last 7 days

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Unlimited lifetime support, always available.

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Specifications

Power Rating 440W

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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.

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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.

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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.

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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.

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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 GMH440W 440W Monocrystalline Monofacial Solar Panel

Model GMH440W | Monocrystalline | 120 Half-Cell 182×91 mm | Monofacial | 1500V System Voltage

440 Wp
Max Power Output
20.3%
Module Efficiency
120 Cells
Monocrystalline Cells

Product Overview

The Grankia GMH440W 440W monocrystalline solar panel is designed for projects that demand reliable power and strong performance in a compact footprint. With a rated maximum power of 440 Wp and panel efficiency up to 20.3%, this module delivers excellent energy yield per square meter for residential, commercial, and light industrial arrays. The panel sits in the broader GMH series power range from 430 to 455 Wp, giving system designers flexibility when matching strings and inverters. A robust anodized aluminium frame, high quality EVA encapsulant, and 3.2 mm tempered glass support long term durability in challenging climates. The GMH440W uses 120 monocrystalline cells sized 182×91 mm, configured as half cells for improved performance and lower resistive losses. With a 12 year product warranty and 1500 V system voltage rating, this Grankia module can be used confidently in modern high voltage string designs. Temperature coefficients are tightly controlled, helping maintain output in hot conditions and improving predictability of long term energy production.

Key Benefits

High power density: The 440 Wp output paired with 20.3% efficiency helps maximize energy generation on limited roof or ground space. This higher power density supports lower balance of system costs and simplifies array design.

Optimized electrical performance: A positive power tolerance of 0 to +1% ensures that each panel delivers at least its rated power under standard test conditions. This improves real world yield and makes system performance more predictable over time.

Reliable in harsh temperatures: With an operating temperature range from -40°C to 85°C, the GMH440W is suitable for cold winters and hot summers. Carefully controlled temperature coefficients help limit output losses in high ambient and cell temperatures.

Durable construction: The panel combines a 3.2 mm glass layer, EVA encapsulation, and an anodized aluminium frame to protect cells from mechanical stress. An IP68 rated junction box with three diodes offers strong moisture resistance and safe long term operation.

Flexible system integration: A 1500 V maximum system voltage and 25 A series fuse rating support use in large strings and varied inverter platforms. The consistent module weight and dimensions make installation straightforward across roof mount and ground mount structures.

How It Works

The GMH440W solar panel converts sunlight into usable electrical energy using high efficiency monocrystalline cells arranged in a 120 half cell layout. When sunlight reaches the 182×91 mm cells, photons are absorbed and create electron flow within the silicon material. This flow becomes direct current electricity, which is directed through the panel’s internal busbars and out through the junction box and DC cables. The panel operates at a maximum power voltage of 34.28 V and a maximum power current of 12.84 A under standard test conditions. System designers combine multiple modules in series and parallel strings to achieve the desired array voltage and current. The generated DC power is then routed to a compatible inverter, where it is converted to alternating current for on site use or export to the grid. Throughout this process, the panel’s electrical characteristics, temperature behavior, and protection features work together to maintain stable output and protect connected equipment.

Monocrystalline energy conversion: Each monocrystalline cell uses a highly ordered silicon structure that supports efficient charge movement and higher output per cell. The GMH440W module groups 120 of these cells to create a powerful generator while keeping voltage and current within safe limits for modern inverters.

Voltage, current, and power point: At its maximum power point, the panel operates around 34.28 V and 12.84 A, delivering approximately 440 Wp under test conditions. Inverters with maximum power point tracking continuously adjust the operating point along the current voltage curve to capture the highest possible output from the module.

Thermal behavior and protection: As temperatures rise, cell voltage naturally decreases, but the GMH440W’s low temperature coefficients limit performance loss. The IP68 junction box with three diodes helps protect the module against reverse currents and localized shading, while the 25 A series fuse rating safeguards wiring and connected components.

Technical Specifications

Brand / Seller Grankia Electric (Guangdong) Co., Ltd.
Country of Origin China
Module Type Monocrystalline, monofacial
Model Number GMH440W
Power Range 430 Wp to 455 Wp (series range)
Maximum Power (Pmax) 440 Wp
Power Tolerance 0 ~ +1 %
Panel Efficiency 20.3% (series range 19.9 ~ 21.1%)
Voltage at Maximum Power (Vmpp) 34.28 V
Current at Maximum Power (Impp) 12.84 A
Open Circuit Voltage (Voc) 40.95 V
Short Circuit Current (Isc) 13.74 A
Nominal Module Temperature 45 ± 2 °C
Operating Temperature Range -40 °C to 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
Cell Size 182 × 91 mm
Number of Cells 120 cells
Glass Thickness 3.2 mm tempered glass
Encapsulant Type EVA (ethylene vinyl acetate)
Frame Type Anodized aluminium frame
Junction Box Diodes 3 bypass diodes
Junction Box Protection Class IP68 rated
Cable Cross Section 4 mm²
Cable Length 300 mm

Certifications & Compliance

Certifications: Module designed to comply with mainstream IEC and UL standards for crystalline PV modules. Please refer to the official datasheet or manufacturer for the latest certification list.
Inverter Compatibility: Suitable for use with most modern string and hybrid inverters that support 1500 V DC systems. Always check inverter input limits for voltage, current, and maximum string power before final selection.
Environmental: Built for outdoor rooftop and ground mount use with IP68 junction box protection and UV stable materials. Operating temperature range from -40 °C to 85 °C supports a wide range of climate zones and environmental conditions.
Warranty: 12 year product warranty on materials and workmanship as specified by Grankia. Performance warranty terms and detailed conditions should be confirmed in the official warranty documentation or datasheet for this module series.

Documentation

Product datasheet is available directly from Grankia or your distributor upon request.

● Available | Contact us for current lead time, logistics options, and project 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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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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