Zodiac PRO Serie Manual De Instrucciones página 119

With twin engines, a second battery is
required. A battery isolator is usually
integrated to the engine, enabling the
batteries to be charged when the
engine is running.
An optional kit can be provided with a
system featuring two battery couplers.
The system enables the engines to be
started with either battery, or by
coupling the batteries (in parallel), or
start them with a single battery if the
other is faulty.
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