Module optimisation now of interest for commercial systems
The use of module optimisers is no longer a novelty in the solar market. These are primarily used in private systems in which different orientations or shaded situations play a role. However, the aim of this optimisation is not only to prevent external influences as effectively as possible – but also minimise module-internal losses due to so-called “mismatch” (output differences between the modules).
With the new large inverters SE50k – SE82.8k or SE66.6k – SE100K, SolarEdge is making this step towards optimising advantages for commercial systems.
The large inverters are available in two variants, these always comprising a primary unit and secondary unit (model 55k/SE66.6k) or two secondary units (model 82.8k/SE100k).
As more and more commercial PV systems are realised, competition is also growing when it comes to system profitability. One option for improved system profitability not only involves boosting yields through module optimisation but also reducing investment costs to begin with. As modules and inverters have already fallen in price, attention is now being paid to the system technology costs, which make up around 10 % of the costs for commercial rooftop systems.
By working with a fixed voltage and enabling the optimisers to be controlled, SolarEdge inverters allow much longer strings to be realised than is the case with conventional inverters. A simulation has revealed how significant the effects can be in a typical system:
- 9 strings routed instead of 16, hence 18 solar cables instead of 32
- 18 MC4 connectors instead of 64 crimped
- Approx. 750m less DC cables installed
- 5m instead of 90m AC cables routed
It is clearly apparent how SolarEdge has successfully made the leap from private to commercial systems, this allowing the extra costs for the optimisers to be compensated by savings in the installation.
You can discover how these figures are calculated – plus more detailed explanations regarding how up to 6 cent/Wp can be saved – in the video from the SolarEdge webinar held recently.