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because of the elimination of the battery controller, but also because of the reduced
wiring, simpler installation, and the reduced number of solar cells required.
In general, the self-regulating system provides too many compromises in design and
runs the risk of over-charging batteries in cooler locations or on cooler days, while
under-charging batteries in hot weather. Slight errors in design or product variability
can, of course, result in one of these extremes occurring virtually all the time,
therefore making such a system quite ineffective and unreliable.
Figure 6.6. Controller topologies (adapted from Usher and Ross, 1998). LVD =
low voltage disconnect.
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