Storing power has been a concern for several industrial sectors in the world. Residential and commercial sectors are highly impacted from inefficient inverter technologies. The focus on solar micro inverters has magnified, resulting in the higher adoption of photovoltaic cell inverters. The efficient AC-to-DC conversion and higher storage capacity stimulates consumer preference for solar micro inverters. Conventional power storage systems are lacking the self-sufficient nature of solar micro inverters. The stand-alone type of solar micro inverter has evidently exhibited higher sales, and is estimated to account for revenues worth more than US$ 470 Mn by the end of 2016.
Procuring such growth is expanding the global market for solar micro inverters to a larger extent. However, companies manufacturing inverters as well as the end-user sectors must be accustomed to the most advantageous inverter technology using solar energy. With solar micro inverting technology at the frontend, there is a significant acceptance towards the advantages of solar inverting technologies used in string inverters and power optimisers. A comparison among them shall help the assessment of benefits and drawbacks of these technologies, prior to implementation.
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Solar Micro Inverters vs Solar String Inverters
String inverters are generally the centralised form of solar inverters, and are widely deployed in the global inverters market. Compared to micro inverters, the key advantage of string inverters is that a single string inverter can do a job of multiple micro inverters. With one string inverter, the user may not keep a check on the efficiency of multiple inverters. For micro inverters, they are preferably used in multiples, depending upon the solar panels. Costs of installing and maintaining solar string inverters is substantially cheaper than that of micro inverters. As a result, commercial and industrial settings can opt for installing string inverters within a fixed expenditure budget.
But, the energy yielding capacity of solar micro inverters is fairly higher as opposed to string inverters. Solar micro inverters theoretically yield higher solar energy and this acts as the core advantage for its adoption. The slight voltage difference between solar panels results in higher power yielding by micro inverters, whereas string inverters reduce the yielding voltage to the lowest voltage panel in the string.
Solar Micro Inverters vs Power Optimisers
Solar micro inverters and power or PV optimisers are commonly referred as module-level power electronics. Solar power optimisers share common features of real-time monitoring and MPPT with micro inverters. However, optimiser do not require trunk cables to connect to solar panels. A simple DC lead wiring works well for power optimisers. Meanwhile, micro inverters work on rigid and parallel bus cables with special mounting hardware. Unlike micro inverters, customised power optimisers can be attached directly to the main module frame of panels. Advanced system monitoring, low heat wastage, and higher storage efficiency are some features that give power optimiser the competitive edge against solar micro inverters.
Based on practicality and feature-based comparison, the installation of solar micro inverters and power optimisers is relatively expensive than that of string inverter. For efficient power yielding, solar micro inverters and power optimisers can be installed with more than one and randomly-orientated solar panels. Unlike string inverters, power optimisers and solar micro inverters can monitor power production and storage capacity of panels individually. In a gist, a customised system incorporating solar micro inverters with power optimisers shall yield higher power and function efficiently than an integrated solar string inverter system.
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