Solar Inverters

R5 Inverter SAJ (SAJ R5 Omvormer)

The weaterproofed SAJ R5 inverters are optimal for residential rooftop solar power systems. The series includes single-phase devices from 3kW to 8kW and three-phase inverters from 3kW to 20kW. As a result, the biggest models of the R5 series are powerful enough to supply a full family household or small-scale business.

The R5 series reaches a maximum efficiency of 98.8%. Consequently, R5 inverters are among the most efficient in the industry. Overload capacities of 110% and 150% for significantly higher power generation. Furthermore, 24h load consumption monitoring allows users to monitor the performance of the solar PV system at all times.

The R5 inverters are equipped with a robust city cooling system based on natural convection. As a result, they stand out with a service life of up to 25 years and noise levels are kept to a minimum. Lastly, a die-casting casing design gives the R5 a better heat dissipating performance.

R5 Series Models

• Phases: 1
• MPPT Circuits: 2
• Variants: 6
• AC Power: 3kW – 8kW
• DC Switch: Yes
• Efficiency: 97.2% – 97.8%

• Phases: 3
• MPPT Circuits: 2
• Variants: 4
• AC Power: 13kW – 20kW
  
• DC Switch: Yes
• Efficiency: 98.40% – 98.46%

R6 Commercial Inverter Series

The R6 series is the next generation of ultra-high performance on-grid inverters. It’s meant for large-scale commercial PV systems, with a power output ranging from 15 to 50kW.

The R6 series  adopts an industrial aesthetic design with LED display, which makes it compact and convenient for users. Safety being a top priority, the R6 comes with full weatherproofing and enhanced protection through AFCI function and build-in AC & DC SPD.

A maximum efficiency of 98.8% guarantees for high-performance operation accross the board. With 150% DC  and 110% AC overload capacity, the R6 is  a truly resilient inverter under almost any circumstances. Worth mentioning, A string current of 16A makes it a perfect match for high-power solar panels. In addition, the R6 supports 24H load monitoring, zero export, and commercial monitoring solutions for smart energy management.

R6 Commercial Series Models

• Variants: 2
• Phases: 3
• MPPT Circuits: 4
• Capacity: 60kW – 75kW
  
• AC Power: 40kW – 50kW
• Efficiency: 98.8%

H1 Hybrid Series

The H1 is a 2018 hybrid solar inverter designed to convert both current and charge  battery sytems. All models of the series are available in power classes from 3kW inverters to 6 kW. Therefore, the H1 is particularly suitable for small to medium-sized systems in residential areas.

The H1 is designed to operate in island mode, allowing the inverter to work even during power outages. In addition, different working modes can be set to minimize your electricity bill.

It charges solar batteries with a voltage range of 42V to 58.5V. The larger models achieve maximum charging currents of 100A. Therefore, the H1 is a great device for quick charging.

With wattages of up to 6 kW, H1 inverters can handle up to 15 panels. In addition, two MPPT circuits ensure maximum performance.

• Input current: 12.5A
  
• MPPT Circuits: 2
• Variants: 6
• AC Power: 3kW – 6kW
• DC Switch: Yes
• Efficiency: 97.2% – 97.8%

H2 Hybrid Series

The H2 is a multi-purpose hybrid inverter can operates in both on- and off-grid solar solutions. Smart working modes are straightforward to set up for this device.  To reliably handle modern high-power PV modules, it is equipped with a 16A string.

The backup mode with UPS function allows for a switching time of less than 10ms. It also fully supports three-phase voltage imbalance. With 150% DC  and AC 110% AC overload capacity, the H2 can be relied on even under the most straining conditions. It also supports AFCI for improved energy management security.

In general, the H2 will significantly improve grid independence and self-consumption rate of any solar power system.

• Input current: 15A
  
• Variants: 4
• MPPT Circuits: 2
• Capacity: 7.5kW – 15kW
  
• AC Power: 5kW – 10kW
• Efficiency: 98.0%

Solar Inverters Explained

The inverter converts DC power to AC for consumption by households and businesses © Clean Energy Reviews

A solar panel string inverter converts DC electric current of solar panels into alternating current (AC). As seen in this diagram, it is the final piece of a PV system. From there, the electricity gets transmitted to end devices for consumption.

Choosing the Right Inverter

The inverter must at least be able to handle the maximum power that the solar power system can produce. For example, a 9kW system with 30 300 watt solar panels needs a 9kW inverter. However, due to system losses in the modules, the nominal power of the inverter may in some cases be up to 25% lower than that of the solar panel array. Long-lasting systems require a high quality inverter with a robust convection cooling system.

Generally, inverters are sensitive electronic devices, producing thousands of watts for up to 10 hours per day. The better protected it is from heat and weather, the better it will perform and the longer it will last. Furthermore, it may be a warranty condition that the device is not installed in a location where it is exposed to direct sunlight. Therefore, it is important to use a high-quality inverter with weatherproofing.

Most grid tie inverters are weatherproof (IP65 protection), allowing for deployment in open areas. Non-weatherproofed inverters require the installation of a weatherproof cage (at an additional cost) for deployment in exposed places.

Solar Inverter Repairs

In many cases, a solar inverters malfunction is not hardware-related. Therefore, the solar inverter fault codes in the device manual and the error message on the monitoring display should be checked first.

Some manufacturers (like SAJ) offer a “5 + 5” year warranty where parts and labor are covered for the first 5 years. Generally, it is highly recommended to find out about the warranty on the device and weigh it against other features of the solar power system to make an informed decision about what inverter best suits your needs.

Solar PV Inverter Types

• String inverters: String inverters like the R5 are the most common type of inverter for home use. Residential installations usually have one per system. They are called string inverter because they are connected to a string of solar modules wired in series.
• Central Inverters: Central inverters are a sub-type of string inverter designed for use with commercial solar power systems. To handle the large size of such solar power systems, they are equipped with very high capacities of up to 1MW.
  
• Hybrid inverters: A hybrid inverter or inverter charger combines an inverter and a battery charger in one device. Hybrid inverters like the H1 are connected to the battery via DC coupling. This way, its electronics coordinate the charging and discharging of the battery.
  
• Off-grid inverters: Off-grid or stand-alone systems require powerful battery inverters with built-in chargers that can be set up as either AC or DC coupled solar systems. Therefore, off-grid systems usually require powerful pure sine wave inverters that yield the same output voltage as the public grid.
• Micro inverters: Micro inverters are very small solar inverters that connect directly to individual solar modules. Because each micro-inverter and module operate independently, they are a good option for complex roof layouts and sites with shading issues.
  
• Power optimisers: Optimiser inverters enable modular solar system configurations – with multiple panel orientations, tilts, azimuths and module types in a given series. Thus, a system with panel optimisers yields a higher output because it bypasses the ‘lowest common denominator’ effect of shaded panels.