Generac 004451 - Manual (Page 15)

2.12 CHARGING A BATTERY
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DANGER! Storage batteries give off explosive hydrogen gas
while recharging. An explosive mixture will remain around the
battery for a long time after it has been charged. The slightest
spark can ignite the hydrogen and cause an explosion. Such an
explosion can shatter the battery and cause blindness or other
serious injury.
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DANGER! Do not permit smoking, open flame, sparks or any
other source of heat around a battery. Wear protective goggles,
rubber apron and rubber gloves when working around a battery.
Battery electrolyte fluid is an extremely caustic sulfuric acid
solution that can cause severe burns. If spill occurs flush area with
clear water immediately.
Your generator has the capability of recharging a discharged 12 Volt
automotive or utility style storage battery. Do not use the unit to
charge any 6 Volt batteries. Do not use the unit to
crank an engine having a discharged battery.
To recharge 12 Volt batteries, proceed as follows:
• Check fluid level in all battery cells. If necessary, add ONLY distilled
water to cover separators in battery cells. Do not use tap
water.
• If the battery is equipped with vent caps, make sure they are
installed and are tight.
• If necessary, clean battery terminals.
• Connect battery charge cable connector plug to panel receptacle
identified by the words "12-VOLT D.C."
• Connect battery charge cable clamp with red handle to the positive
(+) battery terminal.
• Connect battery charge cable clamp with black handle to the
negative (-) battery terminal.
• Start engine. Let the engine run while battery recharges. Engine idle
control switch must be in off position for battery charging.
• When battery has charged, shut down engine.
Note: Use an automotive hydrometer to test battery
state of charge and condition. Follow the hydrometer
manufacturer's instructions carefully. Generally, a
battery is considered to be at 100% state of charge
when specific gravity of its fluid (as measured by
hydrometer) is 1.260 or higher.
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Section 2 — Operation
Commercial-Industrial-Residential Portable Generator System