Campbell CH201, Product Manual

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FIGURE 4-1. CH201 schematic
An unregulated solar panel or AC-to-DC converter typically supplies charging power to the
CH201. As shown in
FIGURE 4-1 (p. 4), diodes connected to the two DC In terminals provide input
reversal protection and isolation between power sources. DC In terminals have a polarity that
must be followed. Connect the positive wires to the DC In terminals, and connect the negative
wires to the G terminals. Reversed polarity inputs, however, will NOT damage the CH201. The
DC In input terminals have an input current limit of approximately 10 amps, making the CH201
well suited for 170 watt or smaller solar panels. Higher powered solar panels may not damage the
CH201, but the additional power likely won't be fully used. Additionally, each input has a
programmable current limit. See
(Optional) Configure using Device Configuration Utility (p. 12).
Internal diodes route power from the source with the highest input voltage. An AC-mains-
powered application can use a solar panel for back-up if the AC-to-DC source has a higher
CH201 12V Charging Regulator 4