Sunceco SEM 340 Diamond
Sunceco SEM 340 Diamond
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Sunceco SEM 340 Diamond

Sunceco SEM 340 Diamond

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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.

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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.

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.

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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.

Sunceco SEM 340 Diamond 340W Monocrystalline Mono Solar Panel

Model SEM 340 Diamond | Mono-crystalline Silicon | 60 Full-Cell Standard | Monofacial | 1000 V System Voltage

340 W
Max Power Output
19.63%
Module Efficiency
315–345 W
Power Class Range

Product Overview

The Sunceco SEM 340 Diamond 340W monocrystalline solar panel is engineered for high efficiency and long term reliability in residential, commercial, and light industrial projects. With module efficiency up to 19.63 percent and a power range from 315 to 345 watts, this Diamond Series module delivers strong energy yields from a compact footprint. It uses mono-crystalline silicon cells, advanced surface texturing, and high transmittance tempered glass to capture more sunlight and convert it into usable electricity. A robust anodized aluminum frame, IP67 junction box, and MC4 compatible connectors support fast installation and dependable performance in demanding outdoor environments. Backed by a 15 year product warranty and long lasting power output guarantees, this panel is designed to provide stable energy production over decades while helping reduce electricity bills and carbon footprint.

Key Benefits

High power density for limited roof space: Up to 340 watts at 19.63 percent efficiency allows more energy production from smaller arrays, which is ideal where roof or ground space is restricted and system output must be maximized.

Reliable performance across 315–345 W range: The Diamond Series covers several power classes from 315 to 345 watts, which makes system design flexible and allows arrays to be tailored around project budgets and target yields.

Strong output in low irradiance conditions: Optimized cell design and surface texturing support outstanding power delivery during cloudy weather, mornings, and evenings, which increases the total kilowatt hour production across the year.

Built for harsh environmental exposure: Reinforced 3.2 millimeter tempered glass, an anodized aluminum frame, and an anti aging backsheet combine to resist sand abrasion, dust, salt mist, and ammonia corrosion in challenging climates.

Bankable, low degradation investment: Positive power tolerance, a typical total degradation rate of just 0.8 percent per year, and long term power warranties help secure predictable energy yields and improve project bankability.

How It Works

This Sunceco mono-crystalline module converts sunlight into direct current electricity using premium silicon solar cells wired together in a sealed glass laminate. When sunlight hits the cell surface, photons transfer energy to electrons within the silicon structure and create an electric current. That current is collected by conductors on the cell surface and routed through factory assembled cables and MC4 compatible connectors. In a complete solar power system, this direct current feeds a compatible inverter, which converts it into alternating current for on site consumption or export to the grid. Stable output under standard test conditions and strong performance at nominal module operating temperature help maintain energy yields throughout the day. Very low thermal coefficients help the module retain power as cell temperatures rise in hot climates, which supports dependable operation in real world rooftop and ground mount installations.

Mono-crystalline cell conversion: Each high grade mono-crystalline silicon cell absorbs incident sunlight and generates a flow of electrons. These cells are interconnected in series to build up voltage and in parallel strings to deliver the required current at the module terminals.

Optical enhancement and tempered glass: Advanced surface texturing on the cells and high transmittance 3.2 millimeter reinforced glass reduce reflection losses and trap more light inside the module. This design helps maintain strong power output even under lower irradiance levels such as overcast conditions or partial shading.

System integration and protection: The robust IP67 junction box protects electrical connections against dust and water ingress during long term outdoor exposure. Factory fitted 4.0 square millimeter solar cables and MC4 type connectors simplify string wiring to inverters while maintaining secure, low resistance connections across the array.

Technical Specifications

Brand / Manufacturer Sunceco Inc., United States
Model Name SEM 340 Diamond, Diamond Series
Cell Technology / Type Mono-crystalline silicon solar cells
Power Range 315 Wp to 345 Wp Diamond Series modules
Maximum Power (Pmax, STC) 340 Wp at 1000 W/m², 25 °C, AM 1.5
Module Efficiency (STC) 19.63% module efficiency for SEM 340 Diamond
Power Tolerance 0 / +5 W positive power tolerance
Voltage at Maximum Power (Vmpp, STC) 37.05 V
Current at Maximum Power (Impp, STC) 9.18 A
Open Circuit Voltage (Voc, STC) 44.23 V
Short Circuit Current (Isc, STC) 9.63 A
Maximum Power at NMOT 252 Wp at nominal operating cell temperature
Vmpp at NMOT 32.99 V
Impp at NMOT 7.66 A
Voc at NMOT 40.27 V
Isc at NMOT 7.99 A
Nominal Operating Cell Temperature 42 ± 3 °C
Operating Temperature Range -40 °C to 85 °C operating range
Temperature Coefficient of Pmax -0.308 % per °C
Temperature Coefficient of Voc -0.243 % per °C
Temperature Coefficient of Isc +0.047 % per °C
Maximum System Voltage 1000 V DC
Module Dimensions (H × W × D) 1762 × 983 × 35 mm overall size
Weight per Module 19.5 kg module weight
Front Glass 3.2 mm high transmittance reinforced tempered glass
Backsheet Material Anti aging protective backsheet film
Frame Type Anodized aluminum alloy frame construction
Junction Box Protection Class IP67 rated junction box enclosure
Output Cable Specification 4.0 mm² PV special cable, pre assembled
Connector Type MC4 compatible connectors

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 tested construction.
Inverter Compatibility: Designed for modern grid tied and off grid string and hybrid inverters that accept 1000 V DC class mono-crystalline PV modules with MC4 compatible connectors and standard current levels.
Environmental: Resistant to sand and dust abrasion, salt mist, and ammonia environments, with mechanical load ratings up to 3800 Pa wind and 5400 Pa snow, including impact resistance to 35 mm hail at 97 km/h.
Warranty: 15 year manufacturing product warranty, 12 years power warranty to 90 percent of rated output, and 25 years power warranty to 80 percent of rated output, supported by low annual degradation around 0.8 percent.

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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