SECTION 4 ELECTRIC SYSTEM
SU5 OWNERS MANUAL 2014
If the electrolyte Specific Gravity is low (less than 1.1098 SG) or individual battery voltage is
less than 5.25 volts for three cells (10.5 volts for six cells), recharge each battery with an
ordinary automotive style trickle charger at a rate of 3 to 6 amps.
It is not necessary to disconnect the battery cables, as the alligator style clips can be connected
to each positive and negative battery post. Follow specific charger instructions.
To prevent a spark from igniting the gas emitted from the batteries, always disconnect
the charger AC power cord first when moving the positive/negative alligator clips.
Be sure to charge all of the batteries in the set. Each battery may require two to three hours of
charging to bring it back to serviceable condition. After all batteries have been individually
charged, remove the automotive charger and restart charging with the on-board charger. It may
require several 8-12 hour cycles to bring severely discharged batteries back to 100% charged
condition. If again the charger has the RED FAULT LED flashing there is a problem with one or
more of the batteries.
SPECIFIC GRAVITY TEST
NOTICE
: The following information does NOT apply to sealed batteries.
It is possible to determine a battery's ability to perform by measuring the specific gravity (sp. gr.)
of each cell with a hydrometer. This is the best method to determine a defective battery.
The hydrometer readings indicate two things:
State of Charge - The amount of electrical power stored in the battery.
Condition - The ability of battery to store and deliver power.
NOTICE:
Batteries should be fully charged before performing specific gravity tests to
determine battery condition. Hydrometer tests of batteries not fully charged are
misleading and inconclusive.
There are different type hydrometers. Carefully read and follow the instructions supplied with
your hydrometer.
NOTICE:
Specific gravity readings are at 80
0
F. Values need adjustment for electrolyte
temperature. Reduce .004 for every 10
0
F below 80
0
F. Increase by that amount for
every 10
0
F above.
TIPS FOR PROLONGING BATTERY LIFE
NOTICE:
A common misconception is Deep Cycle Batteries develop a memory, lose
capacity, or must be discharged until the BDI warning flashes and then recharged.
Deep Cycle Wet Lead Acid Batteries are not like cell phone NiCad Batteries. Deep
Cycle Batteries benefit from frequent charging and being maintained at as close as
possible to a 100% state of charge. Plugging in the on-board charger overnight or
when the vehicle is not in use for 3-5 or more days is encouraged.
4-7
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