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1.3 External Battery Safety
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The power system requires an over-current protection device for the external batteries. The maximum
allowable current is typically 2500 A but can be less depending on the model. Follow the local electrical
codes.
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Ensure that the external battery connection is equipped with a disconnect.
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If the batteries are stored for extended periods before the installation, charge the batteries at least once
every three months to ensure optimum performance and maximum battery service life.
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Refer to the battery manufacturer’s recommendation to select the correct “float” and “equalize” charge
voltage settings. Failure to do so can damage the batteries. Verify that the battery charger’s “float” and
“equalize” settings are correct.
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The batteries are temperature sensitive. During extremely cold conditions, a battery’s charge acceptance is reduced and requires a higher charge voltage. During extremely hot conditions, a battery’s
charge acceptance is increased and requires a lower charge voltage. To allow for changes in temperature, the battery charger must be equipped with a temperature compensating system. For hybrid systems, refer to the rectifier manual for information about temperature compensation.
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If the batteries appear to be overcharged or undercharged, first check for defective batteries and then
verify that the charger voltage settings are correct.
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To ensure optimal performance, inspect the batteries according to the battery manufacturers recommendations. Check for signs of cracking, leaking, or unusual swelling. Some swelling is normal.
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Check the battery terminals and connecting wires. Periodically clean the battery terminal connectors
and retighten them to the battery manufacturer's torque specifications. Spray the terminals with an approved battery terminal coating such as NCP-2 or No-Ox.
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Verify that the polarity of the cables are correct before connecting the batteries to the power module. The
polarity is clearly marked on the batteries. The battery breaker will trip and the rectifiers may be damaged if the cables are connected with the wrong polarity.
1.4 Utility Power Connection
Connecting to the utility must be performed by qualified service personnel only and must comply with local
electrical codes. The utility power connection must be approved by the local utility before the installation.
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