Photovoltaic Design and Installation For Dummies by Ryan Mayfield

Author:Ryan Mayfield
Language: eng
Format: epub, pdf
ISBN: 9781119544371
Publisher: Wiley
Published: 2019-03-26T00:00:00+00:00

The minimum to maximum voltage values on both the AC and DC sides define the inverter’s two voltage windows (a voltage window is a range of allowed voltages). If the voltage values fall outside of these windows, the inverter won’t work; in the case of too much DC voltage, the inverter can actually be damaged. Keeping the voltages inside these windows is an important design consideration. After all, it’s your job to keep the PV array operating and maximizing your client’s investment.

To keep the voltage values within the inverter’s voltage window on the DC side, you must define the adjusted voltage values of the PV array and the DC voltage window based on temperature. In Chapter 6, I explain how PV modules are affected by temperature, so head there if you need to see those relationships. (You also need to remember the relationships between open circuit voltage, Voc, and maximum power voltage, Vmp, for this portion of the design; I cover these in Chapter 6 as well.) For the inverter’s AC voltage, you must choose an inverter that matches the available AC voltages. I explain what you need to know in the sections that follow.

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