Sunceco SEM 345 Diamond
Sunceco SEM 345 Diamond
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SKU  PES-SPS-SOL-19046

Sunceco SEM 345 Diamond

Sunceco SEM 345 Diamond

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

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In Stock

Get yours today!

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9+ sold

In the last 7 days

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Delivery timeframe shown above at checkout

Lifetime Customer Support

Unlimited lifetime support, always available.

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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.

Sunceco SEM 345 Diamond 315–345W Monocrystalline Glass/Aluminium Solar Panel

Model SEM 345 Diamond | Mono-crystalline Silicon | 72 Full-Cell | Monofacial | 1000 V System Voltage

345 W
Max Power Output
19.92%
Module Efficiency
72
Mono-crystalline Cells

Product Overview

The Sunceco SEM 345 Diamond monocrystalline solar panel delivers up to 345 W of reliable power in a compact footprint. This high performance module is engineered for residential, commercial, and light industrial rooftop or ground mounted systems. Its Diamond Series design offers strong efficiency, with module efficiency reaching 19.92% at standard test conditions. A wide power range from 315 W to 345 W allows flexible system sizing and easy string configuration. Robust tempered glass, an anodized aluminum frame, and IP67 junction box protection support long term outdoor use. The panel is designed to operate in harsh climates, with an operating temperature range from -40 °C to 85 °C. Stable output is maintained through low degradation, with 90% power guaranteed at 12 years and 80% at 25 years. With a maximum system voltage of 1000 V, the module integrates smoothly into modern inverters and system architectures. Installers benefit from a balanced combination of efficiency, durability, and bankable performance. This makes the Sunceco SEM 345 Diamond solar panel a strong choice for projects where output and reliability matter.

Key Benefits

High power density: Up to 345 W output with module efficiency up to 19.92%, helping maximize energy yield from limited roof space.

Reliable long term performance: Degradation is limited to 0.8% per year, with 90% power at 12 years and 80% at 25 years.

Durable mechanical design: Tempered 3.2 mm glass, anodized aluminum frame, and IP67 junction box support demanding environments and long service life.

Consistent energy production: The module maintains strong output at nominal operating cell temperature, reaching 256 W at NMOT conditions.

Flexible system integration: A 1000 V system rating, MC4 compatible connectors, and 4 mm² PV cables simplify string design and connection.

Optimized for harsh climates: The panel operates between -40 °C and 85 °C, suiting cold regions, hot zones, and coastal applications.

How It Works

The Sunceco SEM 345 Diamond solar panel converts sunlight into clean DC electricity using high efficiency monocrystalline cells. Each silicon cell absorbs solar radiation and releases electrons, creating an electric current across the module. Cells are wired in series to reach the desired operating voltage, which is optimized around 37.23 V at maximum power. When connected to a compatible inverter, the panel’s DC power is converted into usable AC electricity for homes or businesses. The module continues producing power across a wide range of temperatures, supported by carefully engineered temperature coefficients. Advanced encapsulation, front glass, and backsheet materials protect the cells from moisture, dust, and mechanical stress. The MC4 compatible connectors and 4 mm² cables provide secure, low loss connections along the DC string. In a complete solar system, multiple SEM 345 Diamond panels are linked together to reach the target array power. This modular design allows systems to scale from small rooftop projects to larger commercial installations efficiently. With strong low irradiance performance, the panel continues to generate energy during cloudy weather and near sunrise and sunset.

Monocrystalline cell conversion: High purity mono-crystalline silicon cells absorb sunlight and convert it into DC power efficiently. The optimized cell design supports up to 19.92% module efficiency under standard test conditions.

Optimized operating point: The panel operates at 37.23 V and 9.27 A at maximum power under STC, matching modern inverter MPPT ranges. At nominal operating cell temperature, the module still delivers 33.02 V and 7.75 A for steady field performance.

Thermal and environmental management: Temperature coefficients of -0.308% / °C for Pmax and -0.243% / °C for Voc limit output losses in hot conditions. The module is tested for a nominal operating cell temperature of 42 ± 3 °C and continues working from -40 °C to 85 °C.

Technical Specifications

Brand / Manufacturer Sunceco Inc., United States
Model Name SEM 315 / 320 / 325 / 330 / 335 / 340 / 345 W Diamond Series
Module Type Mono-crystalline solar module, Diamond Series
Power Range (STC) 315 W to 345 W
Maximum Power Pmax (STC) 345 Wp
Module Efficiency Range (STC) 18.19% to 19.92%
Module Efficiency (SEM 345) 19.92%
Power Tolerance (Series Datasheet) 0 / +5 W
Power Tolerance (Input Content) 0 ~ +1.5 %
Total Degradation Rate 0.8 % per year (linear)
Voltage at Maximum Power Vmpp (STC) 37.23 V
Current at Maximum Power Impp (STC) 9.27 A
Open Circuit Voltage Voc (STC) 44.45 V
Short Circuit Current Isc (STC) 9.72 A
Maximum Power Pmax (NMOT) 256 Wp
Voltage at Maximum Power Vmpp (NMOT) 33.02 V
Current at Maximum Power Impp (NMOT) 7.75 A
Open Circuit Voltage Voc (NMOT) 40.31 V
Short Circuit Current Isc (NMOT) 8.07 A
Maximum System Voltage 1000 V DC
Nominal Operating Cell Temperature (NOCT) 42 ± 3 °C
Operating Temperature Range -40 °C to 85 °C
Temperature Coefficient of Pmax -0.308 % / °C
Temperature Coefficient of Voc -0.243 % / °C
Temperature Coefficient of Isc +0.047 % / °C
Panel Dimensions (H × W × D) 1762 × 983 × 35 mm
Weight 19.5 kg
Front Glass Type 3.2 mm high transmittance, reinforced tempered glass
Backsheet Anti-aging film
Frame Type Anodized aluminum alloy frame
Junction Box Protection Class IP67 rated junction box
Connector Type MC4 compatible connectors
Cable Cross Section 4.0 mm² PV cables

Certifications & Compliance

Certifications: CE compliant; IEC 61215-1 (ed.1); IEC 61215-1-1 (ed.1); IEC 61215-2 (ed.1); IEC 61730-1 (ed.2); IEC 61730-2 (ed.2); Application Class A; Safety Class II; UL 1703 Solar Module.
Inverter Compatibility: Suitable for most modern grid-tied and off-grid inverters supporting 1000 V DC strings and MPPT ranges around 37 V per module.
Environmental: Designed for resistance to sand and dust abrasion, with safety for salt mist and ammonia corrosion, supporting harsh climate and agricultural installations.
Warranty: 15 year manufacturing product warranty; 12 year power warranty guaranteeing 90% output; 25 year performance warranty guaranteeing 80% output under proper installation and use.

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.

Sunceco SEM 345 Diamond 315–345W Monocrystalline Glass/Aluminium Solar Panel

Model SEM 345 Diamond | Mono-crystalline Silicon | 72 Full-Cell | Monofacial | 1000 V System Voltage

345 W
Max Power Output
19.92%
Module Efficiency
72
Mono-crystalline Cells

Product Overview

The Sunceco SEM 345 Diamond monocrystalline solar panel delivers up to 345 W of reliable power in a compact footprint. This high performance module is engineered for residential, commercial, and light industrial rooftop or ground mounted systems. Its Diamond Series design offers strong efficiency, with module efficiency reaching 19.92% at standard test conditions. A wide power range from 315 W to 345 W allows flexible system sizing and easy string configuration. Robust tempered glass, an anodized aluminum frame, and IP67 junction box protection support long term outdoor use. The panel is designed to operate in harsh climates, with an operating temperature range from -40 °C to 85 °C. Stable output is maintained through low degradation, with 90% power guaranteed at 12 years and 80% at 25 years. With a maximum system voltage of 1000 V, the module integrates smoothly into modern inverters and system architectures. Installers benefit from a balanced combination of efficiency, durability, and bankable performance. This makes the Sunceco SEM 345 Diamond solar panel a strong choice for projects where output and reliability matter.

Key Benefits

High power density: Up to 345 W output with module efficiency up to 19.92%, helping maximize energy yield from limited roof space.

Reliable long term performance: Degradation is limited to 0.8% per year, with 90% power at 12 years and 80% at 25 years.

Durable mechanical design: Tempered 3.2 mm glass, anodized aluminum frame, and IP67 junction box support demanding environments and long service life.

Consistent energy production: The module maintains strong output at nominal operating cell temperature, reaching 256 W at NMOT conditions.

Flexible system integration: A 1000 V system rating, MC4 compatible connectors, and 4 mm² PV cables simplify string design and connection.

Optimized for harsh climates: The panel operates between -40 °C and 85 °C, suiting cold regions, hot zones, and coastal applications.

How It Works

The Sunceco SEM 345 Diamond solar panel converts sunlight into clean DC electricity using high efficiency monocrystalline cells. Each silicon cell absorbs solar radiation and releases electrons, creating an electric current across the module. Cells are wired in series to reach the desired operating voltage, which is optimized around 37.23 V at maximum power. When connected to a compatible inverter, the panel’s DC power is converted into usable AC electricity for homes or businesses. The module continues producing power across a wide range of temperatures, supported by carefully engineered temperature coefficients. Advanced encapsulation, front glass, and backsheet materials protect the cells from moisture, dust, and mechanical stress. The MC4 compatible connectors and 4 mm² cables provide secure, low loss connections along the DC string. In a complete solar system, multiple SEM 345 Diamond panels are linked together to reach the target array power. This modular design allows systems to scale from small rooftop projects to larger commercial installations efficiently. With strong low irradiance performance, the panel continues to generate energy during cloudy weather and near sunrise and sunset.

Monocrystalline cell conversion: High purity mono-crystalline silicon cells absorb sunlight and convert it into DC power efficiently. The optimized cell design supports up to 19.92% module efficiency under standard test conditions.

Optimized operating point: The panel operates at 37.23 V and 9.27 A at maximum power under STC, matching modern inverter MPPT ranges. At nominal operating cell temperature, the module still delivers 33.02 V and 7.75 A for steady field performance.

Thermal and environmental management: Temperature coefficients of -0.308% / °C for Pmax and -0.243% / °C for Voc limit output losses in hot conditions. The module is tested for a nominal operating cell temperature of 42 ± 3 °C and continues working from -40 °C to 85 °C.

Technical Specifications

Brand / Manufacturer Sunceco Inc., United States
Model Name SEM 315 / 320 / 325 / 330 / 335 / 340 / 345 W Diamond Series
Module Type Mono-crystalline solar module, Diamond Series
Power Range (STC) 315 W to 345 W
Maximum Power Pmax (STC) 345 Wp
Module Efficiency Range (STC) 18.19% to 19.92%
Module Efficiency (SEM 345) 19.92%
Power Tolerance (Series Datasheet) 0 / +5 W
Power Tolerance (Input Content) 0 ~ +1.5 %
Total Degradation Rate 0.8 % per year (linear)
Voltage at Maximum Power Vmpp (STC) 37.23 V
Current at Maximum Power Impp (STC) 9.27 A
Open Circuit Voltage Voc (STC) 44.45 V
Short Circuit Current Isc (STC) 9.72 A
Maximum Power Pmax (NMOT) 256 Wp
Voltage at Maximum Power Vmpp (NMOT) 33.02 V
Current at Maximum Power Impp (NMOT) 7.75 A
Open Circuit Voltage Voc (NMOT) 40.31 V
Short Circuit Current Isc (NMOT) 8.07 A
Maximum System Voltage 1000 V DC
Nominal Operating Cell Temperature (NOCT) 42 ± 3 °C
Operating Temperature Range -40 °C to 85 °C
Temperature Coefficient of Pmax -0.308 % / °C
Temperature Coefficient of Voc -0.243 % / °C
Temperature Coefficient of Isc +0.047 % / °C
Panel Dimensions (H × W × D) 1762 × 983 × 35 mm
Weight 19.5 kg
Front Glass Type 3.2 mm high transmittance, reinforced tempered glass
Backsheet Anti-aging film
Frame Type Anodized aluminum alloy frame
Junction Box Protection Class IP67 rated junction box
Connector Type MC4 compatible connectors
Cable Cross Section 4.0 mm² PV cables

Certifications & Compliance

Certifications: CE compliant; IEC 61215-1 (ed.1); IEC 61215-1-1 (ed.1); IEC 61215-2 (ed.1); IEC 61730-1 (ed.2); IEC 61730-2 (ed.2); Application Class A; Safety Class II; UL 1703 Solar Module.
Inverter Compatibility: Suitable for most modern grid-tied and off-grid inverters supporting 1000 V DC strings and MPPT ranges around 37 V per module.
Environmental: Designed for resistance to sand and dust abrasion, with safety for salt mist and ammonia corrosion, supporting harsh climate and agricultural installations.
Warranty: 15 year manufacturing product warranty; 12 year power warranty guaranteeing 90% output; 25 year performance warranty guaranteeing 80% output under proper installation and use.

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

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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