GRID TIED Solar Micro Inverters from Renesola Ltd. – Micro Replus is Solartech’s choice for Rooftop installations!
SOLARTECH ENTERPRISE is the official Distributor of RENESOLA LTD. (NYSE:SOL) products in the Philippines
and authorized to promote, do after sales and maintenance of its products.
MICRO REPLUS is a state of the art micro grid tied inverter which have been proven
to achieve 30% to 50% more yield than traditional string inverters, in the Philippines setting!
ReneSola’s Micro Replus offers a modular and evenly-distributed power generation solution which results in a highly efficient and reliable option. The characteristics of this type of inverter technology are bringing micro-inverters to the forefront of today’s solar PV marketplace.
Each micro-inverter corresponds with a single PV module, resulting in individual maximum power point tracking. In the event of a single module failure in a PV system, only the production from that particular module and micro-inverter is affected, opposed to an entire string. Micro-inverters have more advantages than string and central inverters, thus optimizing PV module power output, which improves the power efficiency of the entire PV system.
In ReneSola’s effort to play an integral part in developing the global PV market, our Micro Replus has not only passed ETL certification in North America and been listed by the CEC, SAA certification in Australia、CE certification in Europe and TUV certification in Germany, but also complies with the requirements of British and Danish grid standards. The Micro Replus will have obtained the most authentication certificates globally, in comparison to other micro-inverters.
Micro Replus Key Features
1. Module level power
Micro Replus offers maximum power point tracking
Figure 2. Micro Replus micro-inverter system architecture
Micro Replus micro-inverters are able to be used in applications where shading might be an issue during certain parts of the day. In actual applications，such when modules are shaded by shadows, clouds, accumulated dirt and uneven attenuation of module efficiency, the faulty module or micro-inverter will not affect the remainder of the system, nor will the efficiency of the whole PV system be reduced.
2. Module level monitoring
Micro Replus micro-inverters use power line carrier communication technology. Through the Micro Replus Gateway (MRG), real-time monitoring and data collection, along with other information from each micro-inverter of the PV system, is uploaded and preserved on to a web server. Users may view operational status and historical data of the entire system at any time while logged in to the the monitoring interface.
The user may view basic components, real-time output power, and archived power generation data. The interface also contributes to the discovery of system failure points, allowing repairs to be made as soon as possible. This helps to reduce the downtime of the system and improves production.
3. Electrical isolation
The Micro Replus micro-inverter’s internal double-switch technology, blocks electrical connections between DC input and grid AC output, reducing DC injection on the AC output side, thus improving the power quality and personal safety.
4. Integrated anti-islanding protection
Micro Replus micro-inverter complies with requirements of the standard IEEE1547 and VDE-AR-N 4105, which includes anti-islanding protection for the hardware. The two switches (Figure 5) are integrated inside of the Micro Replus micro-inverter. The first switch is an inverter bridge with an isolation transformer. The second switch is an electronically controlled AC power relay (EU requirement) . These two switches allow the Micro Replus micro-inverter a disconnect point prior to the the utility grid or the power generation system. The Micro Replus is in compliance with the requirements of anti- islanding protection. The system’s software uses a frequency perturbation method, which controls the switching operation by measuring the accumulation of frequency increments (Δf). The DSP issues a directive to the control circuit to make the switching status successively disconnect from the utility grid or power generation system. This can achieve active anti-islanding protection. Therefore, the system no longer requires a separate device of islanding protection
5. DC high voltage safety
The Micro Replus micro-inverter complies with requirements of safe standard IEC62109-1/-2 and UL1741. Its input voltage range is DC 22V-55V, well within the DC 60V. Compared to traditional centralized power generating system, when the utility grid is faulted, the DC side of traditional centralized power generating systems has a few hundred volts of high voltage DC; the Micro Replus micro-inverter is grounded using the metal enclosure, which complies with safety requirements, preventing shock hazard and protecting personal safety.
ReneSola will continue to be a leader in innovation and R&D, improving every function of the Micro Replus micro-inverter. Our commitment directly results in more stable、more secure、and more reliable PV products for the customer. We provide the most reasonable solution of distributed PV generating system for stakeholders and bring a tremendous economic benefit to the customer.
A Micro Replus inverter will last for around 25 years, compared to a string inverter’s lifetime of around 10 years. This impressive longevity is partly due to the generic components inside, partly due to epoxy resin, which the micro inverter is filled with. Compared to string inverters, the electrical components used in Micro Replus share similarities, such as the DSP, MOSFETs, SCR and transformers, but the topology is different and the devices are scaled down. These relatively generic components are found in many electrical devices around the world, which keeps cost down and ensures their reliability as all components have a proven track record of long service. This also includes features like an isolation transformer, which most string inverters, particularly in Europe, do not have. Where some inverters produce a loud buzzing noise from the electrical current, Micro Replus is virtually silent. The epoxy filling then seals the device from moisture, dust, water and any other foreign body that could potentially cause a failure of any component. That’s why it is the entire device which is IP68 rated, which guarantees integrity even in extreme climates. During the test phase, Micro Replus inverters were put through their paces down to -40˚C and up to 65˚C. That is why ReneSola guarantees their performance for 25 years.
Lowering costs, raising yield
Technically mature and vastly certificated, Micro Replus streamlines the PV system installation process and eases the sales process. Rather than visiting the site, surveying potential shadowing of the rooftop, creating a design and returning to install it, installation can happen on one and the same day.
“It’s all about costs”, says Dieckmann. “You will only need one inverter for the entire lifetime of an installation. And as Micro Replus is designed as a one-box solution that contains a standardized cables harness set and all connectors needed for installation, with no extras that add costs, installers get rid of any necessity to do time consuming planning, configuration and logistics. Electrical wiring gets a lot saver and easier and almost anyone can install it.”
Indeed, micro inverter such as Micro Replus enable smaller installation companies or local electricians with little experience to install a system quickly and easily, and owners can expand as and when they choose. The decentralized concept also gives the owner far more flexibility as they can add new PV modules with ease. This is mostly thanks to reduced shading problems. A common issue at many rooftops, shading can dramatically reduce a PV system’s power production due to overhanging trees or nearby buildings, which are often impossible to avoid. In fact, a 9% shade can influence up to 54% of the total system’s output. The Micro Replus system significantly reduces this power loss by managing each PV module individually, so if one module performs poorly it has a far less dramatic effect on the overall system. This also helps to avoid expensive breakdowns. In so far, it reads with no surprise that Micro Replus is proven to generate 16% higher yields compared to string inverters, as they are far more reliable and operate at an overall efficiency of more than 96.5%.
Comfortable to use
“It’s also good to know that an anti-islanding and automated grid connection device are also already built in, as it is required e.g. in Germany”, states Güven Altun, sales engineer at ReneSola European technical support squad. “Micro Replus is prepared to cope with any grid code around the world and we can show that through product certifications according to standards of any major market around the globe.”
The installation is safer to handle as it runs on a far lower DC input, reducing risk for installers and owners alike. And each unit has an in-built fire detection system that recognises hot spot issues or overheating and can cut off the individual module, allowing the rest of the system to continue running without risk.
In the unlikely event of an inverter were to fail, the owner need only replace a single unit rather than a complicated replacement of an entire string inverter. Using one inverter per module also aids system management. Micro Replus can be connected to a web management interface through an inexpensive communication gateway that allows owners to monitor by individual module, allowing any weakness to be easily spotted and fixed.