Central inverters

Central inverter units start from around 100kW in size and are therefore not relevant for domestic or small scale commercial systems. #10kw solar inverter 96v      They can be as large as 4MW and they are generally used on large scale solar farms to ‘centralise’ power into one place. String combiners are used to combine parallel strings of panels; these are then recombined to feed into the central inverter. The alternative is to use large numbers of small string inverters, creating a ‘distributed architecture’.

At large scale, central inverters provide a less expensive solution than string inverters because fewer inverters are required per site. For example, a 20 MW solar farm could use five to 10 central inverters along with combiner boxes, #pure sine wave inverter        or it could use several hundred string inverters. This is the main reason for using central inverters. String inverters generally provide more granular energy optimisation (due to Maximum Power Point Tracking). #pure sine wave inverter       Furthermore, they have the advantage that if one string or inverter fails, only a small percentage of the solar farm’s power is lost. With central inverters, much more power will be lost if one inverter goes down. Furthermore, troubleshooting and / or fixing a central inverter is a more specialist occupation than troubleshooting and / or fixing a string inverter. 

It is also much less expensive to hold spares of string inverters than it is to hold a back-up central inverter

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