speed depends heavily on a few moving targets: local weather conditions, utility rates and solar rebates and incentives, just to name a few.
THREE STAGES OF OPTIMIZATION
There are basically three different stages of PV system optimization, beginning at system design, continuing through installation and ending with scheduled operation and maintenance for the life of the plant.
1. DESIGN
The design stage includes selecting the right inverter, designing the array, performing a site survey and talking to the customer. It is very important to understand the customer’s needs and consider what is optimal for them. Do they value the public image benefit of offsetting all of their power use? Or, perhaps your customer would like a high ROI, which may mean a smaller "peak $/kWh" shaving system. By identifying their key drivers and then considering site-specific limitations, an integrator can make an informed decision about technology choice.
Careful consideration must also be given to array and inverter access for future servicing. Array layout is influenced by local jurisdiction requirements, building and electrical code standards and often old-fashioned tribal knowledge. Residential and commercial installations require preventative maintenance for worry-free operation, with vegetation management, rodent control and visual inspections just a few things to take into account. Inverter installation manuals usually include a preventative maintenance section that includes periodicity.
String sizing is a necessary practice when designing arrays for string and central inverters. Properly designed systems will ensure the following thresholds are achieved: adequate PV start voltages, inverter operation within the maximum power point window and maximum system voltage below either 600 V
OPTIMIZING PV SYSTEMS - PART 1: INVERTERS
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Optimzing PV Systems eFeature | July 2014