Image via Wikipediabatteries? The simplest and least expensive PV systems are
designed for day use only. These systems consist of modules wired directly to a
DC appliance, with no storage device. When the sun shines on the modules, the
electricity generated is used directly by the appliance. Higher insolation
(sunshine) levels result in increased power output and greater load capacity.
And when the sun stops shining, your appliance stops working. These
simple systems are an appropriate, cost-effective option for loads operated only
during the daytime. Examples of day use systems include: Remote water
pumping with a storage tank. Operation of fans, blowers, or circulators to
distribute thermal energy during the day for solar water heating systems or
ventilation systems. Stand-alone, solar-powered appliances such as
calculators and toys. It is also possible, in a utility grid
interconnected system (see below), to do without batteries, as such a system is
essentially using the grid as its storage device. http://www.ping.fm/zIsr2
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