String inverter

String inverters for your photovoltaic system at PVundSO

Modern string inverters are the central component of your photovoltaic system, ensuring the efficient conversion of direct current (DC) into grid-compatible alternating current (AC). This proven technology is particularly well-suited for traditional rooftop systems with uniform module orientation. At PVundSO, you'll find solar string inverters from renowned manufacturers such as Sofar, Solis, and Growatt, all characterized by high efficiency and reliable performance.

The devices are offered in single-phase and three-phase versions, ensuring a suitable solution for every system size. All string inverters have the necessary certifications for the German market and comply with the VDE-AR-N 4105 standard. The models achieve peak efficiencies of up to 98%, making virtually all generated solar power usable.

String inverters are ideal for unshaded roof surfaces

String inverters with shade management offer an optimal solution for different roof situations thanks to integrated MPP trackers. Devices with multiple MPP trackers can optimize different strings separately, thus enabling the use of multiple roof orientations with just one inverter. This significantly reduces system costs and simplifies installation.

For systems with homogeneous conditions, a single string inverter with one MPP tracker is perfectly sufficient. These systems achieve their maximum efficiency on south-facing roofs without shading, as all modules operate under identical conditions. For more complex rooftop systems with east-west orientation or dormer windows, models with two to three MPP trackers offer the necessary flexibility. Each string is individually controlled to its optimal operating point, significantly increasing the overall system performance.

Installation is typically centralized in the basement or utility room, simplifying maintenance and monitoring. Modern devices feature integrated Wi-Fi interfaces for monitoring system performance via smartphone or computer. The starting voltage for most models is between 50 and 70 volts, while the MPPT voltage range typically extends from 60 to 580 volts.

High-quality string inverters from Sofar, Solis and Growatt

Choosing the right manufacturer significantly impacts the reliability and longevity of your photovoltaic system. Sofar Solar offers string inverters with outputs from 1,1 kW to 20 kW, characterized by their robust design and precise MPPT control. The G3 series devices come standard with Wi-Fi modules and DC disconnect switches, greatly simplifying installation.

Solis offers particularly compact inverters in its S6 series, achieving efficiencies of over 98% despite their small size. These models are ideally suited for single-family homes with system sizes between 3 and 10 kWp. Growatt impresses with its excellent price-performance ratio and offers devices with advanced monitoring functions. All three manufacturers provide warranties of 10 to 15 years on their products.

The devices undergo extensive quality testing and are CE certified as well as possessing the required grid protection certificate. This guarantees safe integration into the German power grid. At PVundSO, you receive only tested models that meet all requirements for operation in Germany and impress with their technical sophistication.

String inverter solar with high efficiency over 98%

The efficiency of an inverter determines what proportion of the generated solar energy is actually available as usable alternating current. Current string inverters achieve European efficiencies between 97,5% and 98,5%, with peak efficiencies reaching as high as 98,7%. Specifically, this means that in a 5 kWp system with a peak power of 5000 watts, only 60 to 125 watts are lost due to conversion losses.

The high efficiency results from optimized power electronics and intelligent cooling concepts. Modern IGBT transistors switch with minimal losses, while adaptive fan controls only activate when needed. The European efficiency rating takes various load ranges into account and thus offers a more realistic comparison value than the pure maximum efficiency.

High-quality devices demonstrate their strengths particularly under partial load, as they operate efficiently even with low levels of sunlight. The low starting voltage of 50 to 70 volts allows for early start-up in the morning and extends the daily production time. With an average system size of 8 kWp, an efficiency improvement of 1% results in additional annual yields of 80 to 100 kWh, which translates into significant yield advantages over 20 years.

Proven string inverters for long-lasting photovoltaic systems

The lifespan of string inverters is typically between 15 and 20 years, with high-quality models operating reliably even beyond this period. Crucial to their longevity are the components used, particularly capacitors and semiconductors. Modern devices utilize film capacitors instead of electrolytic capacitors, which significantly increases lifespan and reduces maintenance intervals.

When purchasing a string inverter, you should pay attention to the manufacturer's warranty, which is 10 years for most brand-name devices and can optionally be extended to 15 or 20 years. The warranty covers defects in materials and workmanship and guarantees you free repair or replacement. At PVundSO, you receive products with a full manufacturer's warranty and comprehensive warranty terms.

Proper sizing significantly contributes to the lifespan of the inverter. As a rule of thumb, the AC rated power of the inverter should be between 85% and 105% of the installed DC module power. Oversizing leads to frequent partial load operation with reduced efficiency, while undersizing puts more thermal stress on the components. Installation in a cool, dry location further extends the lifespan, as high temperatures put a strain on the electronic components.