Sunceco SEM 325 Diamond
Sunceco SEM 325 Diamond
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Sunceco SEM 325 Diamond

Sunceco SEM 325 Diamond

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Unlimited lifetime support, always available.

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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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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 325 Diamond 325W Monocrystalline Mono Solar Panel

Model SEM 325 Diamond | Mono-crystalline silicon | 60 Full-Cell | Monofacial | 1000V System Voltage

325 W
Max Power Output
18.76%
Module Efficiency
315–345 W
Diamond Series Range

Product Overview

The Sunceco SEM 325 Diamond monocrystalline solar panel delivers reliable 325 W output with high conversion efficiency. This Diamond Series module has been engineered for residential, commercial, and light industrial rooftops that demand stable performance over decades. Module efficiency reaches 18.76% at Standard Test Conditions, helping more power fit into constrained roof spaces. The SEM 325 sits within a power range from 315 W to 345 W across the Diamond lineup, allowing flexible system design on one unified platform. A rugged anodized aluminium frame, tempered high-transmittance glass, and anti-aging backsheet support long-term durability in harsh outdoor environments. The panel operates safely up to 1000 V system voltage, making it compatible with modern string inverters and commercial arrays. A 15-year product warranty is combined with a long-term power warranty that limits annual degradation. With strong performance at low irradiance and robust mechanical loading, this panel is well suited to demanding sites with variable weather and seasonal conditions.

Key Benefits

High efficiency mono-crystalline cells: Advanced monocrystalline silicon cells reach 18.76% efficiency at STC, maximizing energy per square meter.

Strong performance across Diamond power range: The Diamond Series covers 315 W to 345 W, enabling flexible array design while maintaining matching aesthetics and electrical behavior.

Robust environmental protection: The panel uses 3.2 mm reinforced tempered glass, an anti-aging backsheet, and IP67 junction box for reliable outdoor use in varied climates.

Optimized for long-term yield: Power warranty guarantees 90% output at 12 years and 80% at 25 years, supported by a low 0.8% degradation rate per year.

Bankable quality and safety: Triple 100% EL testing, PID-free design, and mechanical load ratings up to 3800 Pa wind and 5400 Pa snow increase reliability and project bankability.

How It Works

The Sunceco SEM 325 Diamond solar panel converts sunlight into usable DC electricity using high-performance monocrystalline cells. Each cell absorbs incoming solar radiation and generates an electric current through the photovoltaic effect. Cells are wired together inside the module to produce a 325 W output under Standard Test Conditions. The front side uses high-transmittance tempered glass to allow maximum light into the cell matrix while protecting against impact and weather. An encapsulant layer and anti-aging backsheet seal the cells from moisture and contamination during long-term operation. The integrated junction box and MC4-compatible connectors safely route generated current to string cables and then to the inverter. The inverter later converts this DC power into AC electricity suitable for home or commercial loads. Carefully engineered temperature coefficients maintain stable output over a wide operating range, ensuring dependable yield in both hot and cold climates.

Monocrystalline cell conversion: Mono-crystalline silicon cells absorb photons and free electrons, generating direct current within each cell. Cells are series-connected to build useful voltage levels while current is defined by the cell string, delivering 8.91 A at maximum power under STC.

Optimized operating point (Vmpp and Impp): The module operates most efficiently at 36.49 V and 8.91 A at maximum power under STC. Under Nominal Module Operating Temperature, the optimum point shifts to 32.89 V and 7.35 A, and inverters track this point to maximize harvested energy.

Thermal and environmental management: The module is rated for a cell temperature around 42 ± 3 °C under NMOT, balancing performance and component stress. Temperature coefficients for power, voltage, and current manage output changes as conditions vary between -40 °C and 85 °C during operation.

Technical Specifications

Brand Sunceco Inc.
Country of Origin United States
Series Diamond Series SEM 315–345 W
Model Number SEM 325 Diamond
Cell Technology Mono-crystalline silicon
Cell Type and Count 60 full-size mono cells (typical configuration)
Power Range (Series) 315 W to 345 W
Maximum Power (Pmax, STC) 325 Wp
Module Efficiency (STC) 18.76%
Power Tolerance 0 / +5 W (positive power tolerance)
Voltage at Maximum Power (Vmpp, STC) 36.49 V
Current at Maximum Power (Impp, STC) 8.91 A
Open-Circuit Voltage (Voc, STC) 43.55 V
Short-Circuit Current (Isc, STC) 9.36 A
Maximum Power (Pmax, NMOT) 241 Wp
Voltage at Maximum Power (Vmpp, NMOT) 32.89 V
Current at Maximum Power (Impp, NMOT) 7.35 A
Open-Circuit Voltage (Voc, NMOT) 40.15 V
Short-Circuit Current (Isc, NMOT) 7.76 A
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
Maximum System Voltage 1000 V
Mechanical Load Rating 3800 Pa wind load, 5400 Pa snow load, 35 mm hail at 97 km/h
Module Dimensions (H × W × D) 1762 × 983 × 35 mm
Weight 19.5 kg
Front Glass 3.2 mm high-transmittance reinforced tempered glass
Backsheet Anti-aging protective film
Frame Type Anodized aluminium alloy
Junction Box Protection Class IP67, triple 100% EL tested
Connector Type MC4 compatible
Cable Cross-Section 4.0 mm² PV cable

Certifications & Compliance

Certifications: CE compliant; IEC 61215-1, IEC 61215-1-1, IEC 61215-2; IEC 61730-1, IEC 61730-2; Application Class A; Safety Class II; UL 1703.
Inverter Compatibility: Suitable for modern string and central inverters supporting 1000 V DC systems and MC4-compatible connectors.
Environmental: Designed as PID-free, with resistance to sand and dust abrasion, and tested for salt mist and ammonia corrosion environments.
Warranty: 15-year manufacturing product warranty; performance warranty guaranteeing 90% power at 12 years and 80% power at 25 years, with an approximate 0.8% annual degradation rate.

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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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

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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