One-Stop Solar System Service in Germany
OI Energy delivers end-to-end solar solutions for residential and commercial clients across Germany, powered by direct partnerships with Tier-1 manufacturers.
Tailored Solutions for Every Scale
OI Energy offers customized solar solutions for residential (0-30kW) and commercial (30kW+) clients.
Residential Solar System
Our 0-30kW systems cut electricity bills by up to 50% and boost property value by an average of 4%.
Roof-mounted PV systems
Maximize roof space with efficient, home-integrated panels.
Home battery storage
Store excess power for peak times or outages.
Smart energy monitoring
Track production and usage in real-time via our app.
Grid connection services
We manage all paperwork and technical requirements for seamless integration.
Commercial Solar Systems
Our 20-100kW+ systems reduce operating costs by up to 30% and support sustainability goals.
Large-scale rooftop installations
Save energy and lower carbon footprint using commercial rooftops.
Commercial energy storage
Boost efficiency with advanced battery storage.
Peak demand management
Use stored energy during peak hours to cut demand charges.
Energy efficiency consulting
Get tailored advice from our experts to optimize energy use.
Comprehensive Solar Services
OI Energy provides full-service solar services—design, installation, maintenance, and support.
Our expert team analyzes your home or business site and energy needs, designing custom solar systems to maximize energy output and ROI.
Our solution can achieve a return on investment period of 5-7 years.Our expert team analyzes your home or business site and energy needs, designing custom solar systems to maximize energy output and ROI.
Our solution can achieve a return on investment period of 5-7 years.
Premium Solar Components & Energy Storage
OI Energy directly supplies top-brand solar products from Tier-1 manufacturers, delivering performance and reliability at competitive prices.
Solar Panels
Featuring 22.5% conversion efficiency with PERC technology and bifacial design. TÜV, IEC, and CE certified for all-weather reliability and maximum energy output.
Solar Inverters
98.5% efficiency. Supports remote monitoring and smart grid integration. TÜV, IEC, and CE certified for stable operation and reliability.
Solar Battery Storage
Advanced storage for homes and businesses, enhancing self-consumption. Lithium-ion technology with 6000-cycle lifespan, safe and reliable.
About OI Energy
Professional Qualifications and Service Commitment
OI Energy is a specialist in solar system solutions, dedicated to delivering exceptional services to clients in Germany and Europe. We hold ISO 9001 certification and strictly adhere to German solar standards, ensuring our systems meet the highest quality and safety requirements.
Team Expertise and Product Quality
Our skilled team designs, installs, and maintains advanced solar systems. We partner with top manufacturers like Longi, Trina Solar, and Jinko Solar for reliable, high-quality equipment.
Why Choose OI Energy?
At OI Energy, we possess in-depth expertise and hands-on experience in German solar industry regulations and standards, ensuring your solar projects fully comply with all legal and safety requirements.
Partnerships with LONGi, Trina, and JinkoSolar for cost efficiency. Helping clients obtain competitive prices is one of our primary objectives.
At OI Energy, we prioritize exceptional product quality above all else. To ensure this, we perform a higher percentage of thorough product inspections, setting us apart in our commitment to excellence.
OI Energy is dedicated to every client, no matter the project scale. We ensure this with full maintenance throughout your solar system's lifecycle.
Industry Certifications & Compliance
At OI Energy, our certifications reflect our steadfast dedication to quality and customer satisfaction. They ensure our photovoltaic solutions adhere to top industry standards, offering reliable, trustworthy service.
Product Certificate
We collaborate with top manufacturers to supply high-quality components products have passed ISO(International Organization for Standardization), CQC(China Quality Certification), CE(European Commission), and other international certifications, and are exported to many countries and regions.
Company Accreditation
OI Energy is a trusted solar company in Germany that holds several certifications and accreditations, including MCS, RECC, and ZEREZ. These certifications confirm that our company has expertise in renewable energy installation
Success Stories & Project Highlights
Hear what our satisfied customers have to say about their experience with OI Energy.
Small Bakery Rooftop Solar, Berlin, Germany
Location: Berlin, Germany
Customer Type: Small Business (Bakery)
System Details: Rooftop PV system with battery storage
Capacity: 25 kW
Type: Hybrid (Grid-connected with Battery Storage)
System Components:
LONGi high-efficiency solar modules
SMA three-phase inverter
Tesla Powerwall (15 kWh battery storage)
Energy Savings:
Reduces annual carbon emissions by 8 tons
Lowers electricity bills by approx. €4,800 annually
Customer Feedback:
“The solar system has significantly cut our electricity costs, and customers appreciate our eco-friendly commitment.”
Organic Farm Solar Installation
Location: Tuscany, Italy
Capacity: 25 kW
Type: Grid-connected
System Components:
Trina Solar monocrystalline solar panels
Huawei three-phase inverter
Huawei FusionSolar smart monitoring
Energy Savings:
Annual production of ~30,000 kWh
Reduces approx. 9 tons of CO₂ annually
Covers 60% of farm’s energy consumption
Client Feedback:
“The solar system has significantly cut our electricity costs and aligns perfectly with our organic farming values.”
Sustainable Furniture Workshop, Netherlands
Location: Utrecht, Netherlands
Capacity: 20 kW
Type: Grid-tied (optimized for daytime use)
System Components:
Trina Solar high-performance PV modules
SolarEdge three-phase inverter
Smart energy management (real-time monitoring)
Energy Savings:
Annual reduction of 6 tons of CO₂
Supplies 40-50% of annual energy consumption
Annual Production: 16,000+ kWh
Customer Feedback:
“Almost half of our production now runs on clean solar power, significantly reducing operational costs and appealing to environmentally conscious customers.”
Since installing the solar energy system in our home, the most significant change has been a dramatic reduction in electricity bills, averaging a 60% decrease. Specifically, we save approximately €1,000 annually, which is a significant amount for our household budget. The solar system has operated very stably, with no malfunctions since installation, and its power generation efficiency has fully met our expectations.
Our Latest Works
