Wagan Tech PURE LINE 700 Guide D'utilisation page 17

PROBLEM: Continuous Buzzing Sound
Reason
Input voltage is below 10.5 volts.
Poor or weak battery condition.
Poor or loose cable connection.
Inadequate power being delivered to
the inverter or excessive voltage drop.
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Solution
Keep input voltage above 10.5 volts.
Recharge or replace battery.
Inspect terminals and tighten all
connections.
Use heavier gauge DC cables.
Keep cable length as short as possible.
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