Using A Booster Battery Or Charger (If Equipped); Parallel; Generator Output Connections - Generac Power Systems MDG25IF4 Owner's Manual

Operation
Using a Booster Battery or
Charger (if equipped)
WARNING
Explosion. Batteries emit explosive gases while
charging. Keep fire and spark away. Wear protective
gear when working with batteries. Failure to do so
could result in death or serious injury.
WARNING
Risk of burns. Batteries contain sulfuric acid and can
cause severe chemical burns. Wear protective gear
when working with batteries. Failure to do so could
result in death or serious injury.
CAUTION
Equipment damage. Do not make battery
connections in reverse. Doing so will result
in equipment damage.
See Figure 3-3. A 12 volt booster battery can be
connected in parallel with batteries on the unit to aid in
cold weather starting. ALWAYS use heavy-duty jumper
cables.

Parallel:

•
Amps = Twice as a single battery
•
Volts = Same as single battery
Figure 3-3. Parallel
1. Connect booster battery or batteries to produce the
required system current.
NOTE: To avoid sparks, do not allow the free ends of
jumper cables to touch engine.
2. Connect one end of jumper cable to the POSITIVE
(+) post of the booster battery.
3. Connect the other end of the jumper cable to the
POSITIVE (+) post of battery connected to starter.
4. Connect one end of the other jumper cable to the
NEGATIVE (-) post of the booster battery.
28
5. Complete
connection of the NEGATIVE (-) cable to a good
ground on the engine frame and away from the
batteries.
6. Start the engine. Disconnect jumper cables
immediately after engine starts. Always disconnect
NEGATIVE (-) cable first.

Generator Output Connections

(000137a)
Electrical backfeed. Use only approved switchgear to
isolate generator from the normal power source.
Failure to do so will result in death, serious injury,
and equipment damage.
(000138a)
Electrocution. Do not disable or modify the
connection box door safety switch. Doing so
will result in death or serious injury.
(000167a)
Electrocution. Before connections are made to
the unit, verify the main circuit breaker and
battery disconnect switch are OFF. Failure to do
so will result in death or serious injury.
Electric shock. Only a trained and licensed electrician
should perform wiring and connections to unit. Failure to
follow proper installation requirements could result in death,
serious injury, and equipment or property damage.
The installation should be in compliance with the national
electrical code (NEC), state, and local regulations.
See Figure
lugs (A), located on the lower portion of the control box
behind the lug box door. The lugs provide connection
004508
points to attach external loads to the generator. A large
decal on the inside of the connection lug door details the
proper connections for selected voltages.
Connections to the lugs should be made by running the
power cables up through the opening in the bottom of the
box.
IMPORTANT NOTE: Do not make any connections
directly to the lugs without routing the cables
through the opening. Use a hex-wrench to tighten the
cable connections.
the hookup by
DANGER
DANGER
DANGER
WARNING
3-4. The unit is equipped with connection
Owner's Manual for Mobile Generator
making the last
(000237)
(000157)
(000156)
(000155a)