Arsi AB – Esqual
www.arsi.se
FLIGHT & OPERATION MANUAL ESQUAL VM-1
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2.8 ELECTRICAL SYSTEM
The aeroplane is equipped with a 12V DC electrical system
The engine does not require the aeroplane’s DC system to function, except for starting. Its
ignition system derives its power from an independent generator built into the engine. Full
details of the engine’s electrical system can be found in the Rotax Operator’s Manual.
DC Supply
The battery (Sellpower 7800 (7,8 amps)) is located inside the cowling on the left side of
the firewall. Make sure to keep the battery charged and maintained properly.
The battery receives charge from the engine’s alternator via an electronic
rectifier/regulator unit and a 30 amp fuse. The regulator is a switched mode unit and a
large (22,000 μF) electrolytic capacitor is connected across its output to provide smoothing
for avionics and other services sensitive to electrical noise. It also protects services from
over-voltage in the event of battery disconnection.
Only use recommended charger. See battery manufacturers’ maintenance manual
An analogue, electronic voltmeter or the EFIS mounted on the instrument panel monitors
the battery voltage. Normal readings lie in the range 12 to 14.4 volts.
Distribution and Services
The battery is connected via a 30 amp circuit breaker to a +ve bus bar mounted behind the
instrument panel, and switched by the Master Switch /relay. The bus bar feeds all services
via circuit breakers. The circuit breakers are designed to trip if there is an overload on the
circuit. To reset, push the circuit breaker in. If it trips again do not reset
Electric Starter System
The high starter motor current is switched by a relay mounted on the firewall. The starter
relay is energised when the Master switch is ON and the starter key switch, mounted on
the instrument panel, is turned.
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