Zhongtai New Energy ZT305
Zhongtai New Energy ZT305
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Zhongtai New Energy ZT305

Zhongtai New Energy ZT305

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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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Zhongtai New Energy ZT305 305W Polycrystalline 72-Cell Solar Panel

Model ZT305 | Polycrystalline | 72 Full-Cell Polycrystalline | Monofacial | 1000V System Voltage

305 Wp
Max Power Output
15.71%
Module Efficiency
72
N-Type TOPCon

Product Overview

The Zhongtai New Energy ZT305 305W polycrystalline solar panel delivers reliable power for homes and small commercial systems. This versatile module uses proven polycrystalline cell technology to provide stable output even in demanding environments. With a rated maximum power of 305 Wp, it fits perfectly into residential rooftops, off‑grid cabins, and small industrial installations. Panel efficiency of 15.71% supports solid energy production while maintaining a manageable panel size. The module is configured with 72 cells and a maximum system voltage of 1000 V, allowing flexible array design. It is manufactured by Baoding Zhongtai New Energy Technology Co., Ltd. in China, a specialist in photovoltaic solutions. A robust anodized aluminium frame, tempered glass front, and EVA encapsulant protect the cells from weather and mechanical stress. The ZT305 sits within a wider power range from 300 Wp to 330 Wp, making system planning straightforward. Installers can integrate this panel into new builds or retrofits with confidence in long term performance. The product warranty of 10 years and 25 year power warranty demonstrate a strong commitment to durability and energy yield.

Key Benefits

Reliable 305 Wp output: Each module delivers a nominal maximum power of 305 Wp under standard conditions. This rating supports predictable array sizing and energy forecasts for a wide range of projects.

Balanced efficiency and footprint: Panel efficiency of 15.71% offers a strong balance between energy yield and module size. The 1960 x 990 mm footprint suits many roof layouts and ground mount structures.

Long term performance assurance: A 10 year product warranty covers manufacturing quality and materials. A 25 year power warranty guarantees at least 80% of initial output after the warranty period, with a low annual degradation rate.

Robust construction for harsh climates: Tempered 3.2 mm glass, EVA encapsulation, and an anodized aluminium frame provide excellent mechanical strength. The operating temperature range from -45°C to 85°C supports use in diverse climates.

Flexible system design options: A maximum system voltage of 1000 V supports long string configurations to reduce BOS costs. The wide power range from 300 to 330 Wp makes matching different array capacities straightforward.

Consistent current and voltage characteristics: With Vmpp of 36.8 V and Impp of 8.3 A, the module integrates smoothly with common string inverters. The tight positive power tolerance from 0 to +1.5% enhances real world generation.

How It Works

This Zhongtai New Energy ZT305 polycrystalline module converts sunlight into usable electrical energy through photovoltaic cells. Its 72 polycrystalline silicon cells are connected in series and encapsulated under tempered glass. When sunlight hits the cell surface, photons transfer energy to electrons inside the silicon structure. These energized electrons move under the internal electric field and create direct current electricity. The current is collected by metallic busbars and directed through the panel junction box. From there, DC power flows along strings of modules to an inverter, which converts it into AC electricity. That AC power is then used to supply building loads or exported to the grid. The panel’s electrical parameters, such as Voc of 45.6 V and Isc of 8.91 A, define how it behaves in different system configurations. Temperature coefficients describe how output changes with cell temperature increases. This information helps designers predict yield and select optimal string lengths for efficient operation.

Photovoltaic energy conversion: The 72 polycrystalline cells absorb sunlight and release charge carriers within the silicon lattice. An internal electric field drives these charge carriers, creating a direct current at the panel terminals. The rated maximum power of 305 Wp is achieved when the module operates at its Vmpp and Impp. Under standard test conditions, this balance point occurs at 36.8 V and 8.3 A respectively.

String configuration and system voltage: The panel is designed for arrays operating up to 1000 V system voltage. Multiple modules can be wired in series to reach inverter input requirements while staying within safety limits. Open circuit voltage of 45.6 V per panel helps determine the maximum number of modules in a string. Short circuit current of 8.91 A informs cable sizing and protection device selection in the DC circuit.

Thermal behavior and real world yield: Panel output is influenced by operating temperature across different seasons. The power temperature coefficient of -0.45% per °C describes how Pmax drops as temperature rises. Voc decreases by about -0.37% per °C while Isc increases slightly by 0.06% per °C. Designers use this data to estimate performance on hot roofs, cold mornings, and varying irradiance conditions.

Technical Specifications

Brand Baoding Zhongtai New Energy Technology Co., Ltd.
Country of Origin China
Model Number ZT305
Module Type Polycrystalline, monofacial
Power Range 300 Wp to 330 Wp
Maximum Power (Pmax) 305 Wp
Module Efficiency 15.71%
Panel Efficiency Range 15.46% to 17.0%
Power Tolerance 0 to +1.5%
Total Degradation at 25 Years 20% maximum (80% of initial power guaranteed)
Indicative Annual Degradation Rate Approximately 0.8% per year over 25 years
Voltage at Maximum Power (Vmpp) 36.8 V
Current at Maximum Power (Impp) 8.3 A
Open Circuit Voltage (Voc) 45.6 V
Short Circuit Current (Isc) 8.91 A
Maximum System Voltage 1000 V
Series Fuse Rating 15 A
Nominal Operating Cell Temperature 46 ± 2°C
Operating Temperature Range -45°C to 85°C
Temperature Coefficient of Pmax -0.45% / °C
Temperature Coefficient of Voc -0.37% / °C
Temperature Coefficient of Isc +0.06% / °C
Panel Dimensions (H x W x D) 1960 x 990 x 40 mm
Weight 25.5 kg
Cell Count and Type 72 polycrystalline cells
Front Glass 3.2 mm tempered glass
Encapsulant EVA (ethylene vinyl acetate)
Frame Material Anodized aluminium frame

Certifications & Compliance

Certifications: Factory certification details are typically provided on the official datasheet and nameplate. Please refer to the manufacturer documentation or contact your distributor for the exact IEC and safety standards for this model.
Inverter Compatibility: Compatible with most grid‑tie and off‑grid string inverters that accept 1000 V DC systems. Final compatibility should always be confirmed against inverter voltage and current limits and local electrical codes.
Environmental: Designed for outdoor photovoltaic use with wide thermal operating range from -45°C to 85°C. Resistance to weather exposure is supported by tempered glass, EVA encapsulation, and anodized aluminium framing.
Warranty: 10 year limited product warranty covering materials and workmanship. 25 year limited power warranty with at least 80% of original power output guaranteed at the end of the warranty period, based on an indicative 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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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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