G Solar GSM 300-375W BF framed
G Solar GSM 300-375W BF framed
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G Solar GSM 300-375W BF framed

G Solar GSM 300-375W BF framed

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In Stock

Get yours today!

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9+ sold

In the last 7 days

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Flat Rate Shipping - Calculated at Checkout

Delivery timeframe shown above at checkout

Lifetime Customer Support

Unlimited lifetime support, always available.

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Specifications

Power Rating 375W

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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.

G-Solar GSM 300–375W Bifacial Monocrystalline Framed Solar Panel

Model GSM 300–375W BF framed | Mono-crystalline Bifacial | 60 Full Cells | Bifacial | 1500V System Voltage

300–385 W
Max Power Output
Up to 18.8%
Module Efficiency
60 Cells
Mono-crystalline

Product Overview

The G-Solar GSM 300–375W Bifacial Monocrystalline Framed Solar Panel is designed for high energy yields in residential, commercial, and industrial systems. Its mono-crystalline bifacial technology captures light from both sides, increasing power generation compared to standard monofacial modules. Premium tempered glass on the front and back, combined with an anodized aluminium frame, ensures strong mechanical stability and long-term outdoor reliability. The panel delivers up to 18.8% efficiency under standard test conditions for the 310 W variant, with a maximum system voltage of 1500 V for flexible system design. German engineering, rigorous electroluminescence testing, and a proven degradation profile provide dependable output over decades. This module is ideal for rooftop arrays, ground mounts, carports, and high-reflectance installations where every watt of solar production matters.

Key Benefits

Higher Yield with Bifacial Design: Reflected light is harvested from the rear side, delivering a power generation gain of around 10–30% under suitable installation conditions.

Stable Long-Term Performance: Zero light induced degradation, low annual degradation rate of about 0.67%, and positive power tolerance support reliable output over the lifetime of the system.

Robust Mechanical Strength: The module withstands up to 3800 Pa wind load and 5400 Pa snow load, with certified resistance to hail, sand, and dust abrasion.

Enhanced Environmental Durability: Protection against salt mist and ammonia corrosion makes this panel suitable for coastal, agricultural, and industrial environments.

Bankable Warranty Package: A 15-year manufacturing warranty, plus 12 years at 90% power and 30 years at 80% power, provides long-term investment security.

Flexible System Integration: With a 1500 V maximum system voltage, MC4 compatible connectors, and a 15 A series fuse rating, the module integrates smoothly into modern string inverter and central inverter systems.

How It Works

This mono-crystalline bifacial solar panel converts sunlight into direct current electricity using high quality silicon cells arranged in a 60 cell layout. The front and rear glass surfaces allow light to reach the active cell surfaces from above and from reflected sources below the module. Under standard test conditions, the front side provides the rated output from 300 W to 385 W, depending on the selected model. The rear side produces additional power when installed above bright or reflective surfaces such as light concrete, white roofing, or snow. Power electronics such as string inverters or hybrid inverters then convert the generated DC into usable AC electricity for on-site loads or export to the grid. The integrated junction box, bypass diodes, and MC4 compatible connectors ensure safe operation, easy wiring, and reliable current flow across a wide temperature range from –40 °C to 85 °C.

Front-Side Power Generation: The front side operates at standard test conditions of 1000 W/m² irradiance, 25 °C cell temperature, and AM 1.5 spectrum. Under these conditions, the GSM 300 W module delivers a Pmax of 300 W with a Vmpp around 32.3 V and Impp around 9.29 A, while higher bin classes reach up to 385 W with increased current. The mono-crystalline cells convert incident sunlight into DC power with module efficiencies up to 18.8%, allowing compact arrays with strong output on limited roof space.

Rear-Side Bifacial Gain: The rear glass side captures diffuse and reflected light from the ground or mounting surface, contributing additional output up to 10–30% in optimized layouts. Under STC-like rear conditions, rear-side Pmax for the 300 W class is specified around 255 W, with proportionally similar values for higher power classes. This effect is strongest when modules are elevated above light coloured or reflective surfaces with adequate spacing, which increases overall system yield without additional module area.

Performance Across Real-World Conditions: At nominal operating cell temperature conditions of 800 W/m² and 20 °C, the 300 W bifacial panel delivers about 221 W from the front side. Carefully controlled temperature coefficients of –0.38%/°C for Pmax, –0.30%/°C for Voc, and +0.048%/°C for Isc help maintain strong performance in hot climates. Triple 100% electroluminescence testing ensures hidden cell defects are minimized, so the panel continues operating reliably under varying irradiance, temperature, wind load, and snow load conditions.

Technical Specifications

Brand G-Solar
Model Series GSM 300–385W BF framed, Premium BF Series
Technology Mono-crystalline bifacial, advanced surface texturing
Cell Configuration 60 cells (6×10), 5 bus bars
Power Range (Front Side STC) 300 W / 305 W / 310 W up to 385 W, depending on model
Maximum Power (Pmax) – GSM 300 (STC) 300 W front side / 255 W rear side
Vmpp – GSM 300 (STC) 32.3 V front side / 32.2 V rear side
Impp – GSM 300 (STC) 9.29 A front side / 7.92 A rear side
Voc – GSM 300 (STC) 39.2 V front side / 38.9 V rear side
Isc – GSM 300 (STC) 9.82 A front side / 8.41 A rear side
Module Efficiency Range (STC) 18.2% to 18.8% front side, 15.5% to 16.1% rear side equivalent
Pmax at NOCT – GSM 300 221 W front side / 187 W rear side at 800 W/m², 20 °C
Vmpp at NOCT – GSM 300 29.7 V front side / 29.6 V rear side
Impp at NOCT – GSM 300 7.43 A front side / 6.34 A rear side
Open-Circuit Voltage at NOCT – GSM 300 36.3 V front side / 36.0 V rear side
Short-Circuit Current at NOCT – GSM 300 7.91 A front side / 6.78 A rear side
Power Tolerance 0 to +5 W positive tolerance on nameplate rating
Maximum System Voltage 1500 VDC (IEC) / 1000 VDC (UL)
Maximum Series Fuse Rating 15 A
Nominal Operating Cell Temperature (NOCT) 42 ± 2 °C
Operating Temperature Range –40 °C to 85 °C
Temperature Coefficient of Pmax –0.38 %/°C
Temperature Coefficient of Voc –0.30 %/°C
Temperature Coefficient of Isc +0.048 %/°C
Module Dimensions (H × W × D) 1974 × 992 × 35 mm
Weight 21.7 kg
Front / Back Glass 2.0 mm tempered glass on both sides
Frame Material Anodized aluminium alloy framed design
Junction Box IP68 distributed junction box with bypass diodes
Connector Type MC4 compatible connectors
Output Cable 4.0 mm² cables, asymmetrical lengths (–) 350 mm, (+) 160 mm
Mechanical Load Rating 3800 Pa wind load, 5400 Pa snow load, 35 mm hail at 97 km/h
Country of Origin Germany

Certifications & Compliance

Certifications: CE compliant, IEC 61215 application, TÜV Safety Class II, UL 1703, triple 100% EL tested, PID free.
Inverter Compatibility: Suitable for modern grid-tied and hybrid inverters that accept 1500 VDC strings and MC4 compatible connectors, including residential, commercial, and utility scale systems when designed within electrical limits.
Environmental: Excellent fire resistance, resistance to sand and dust abrasion, tested for salt mist and ammonia corrosion, suitable for coastal, agricultural, sandy, snowy, and high latitude regions.
Warranty: 15-year manufacturing warranty, 12 years at 90% rated power output, and 30 years at 80% rated power output, supported by the bankable Premium BF Series design.

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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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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