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784 PHOTOVOLTAIC SYSTEMS<br />

Figure 17.32<br />

The International Space Station<br />

17.3 COMPONENTS FOR PV SYSTEMS<br />

As has been seen in Section 17.2.2.8, the so-called balance of systems play a key role<br />

in the lifetime costs of photovoltaic systems. Therefore, the main components will be<br />

described as a summary; for more details, see the respective chapters in this book.<br />

17.3.1 Battery Storage<br />

Stand-alone PV systems require energy storage to compensate for periods without or<br />

within sufficient solar irradiation, such as during the night or during cloudy weather.<br />

In all cases in which electric energy storage is required, the classical electrochemical<br />

accumulator battery is the most convenient form of energy storage for a PV system,<br />

especially since its DC (direct current) characteristic allows for direct connection between

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