Xantrex PRO XM 1000 Owner's Manual page 69

Battery Types
Battery
Connections
Battery State of
Charge
B–8
Connections to battery posts must be made with permanent connectors
that provide a reliable, low-resistance connection. Do not use alligator
clips. Clean the connections regularly and prevent corrosion by using a
protective spray coating or Vaseline.
You can measure battery state of charge with a hydrometer or
approximate state of charge with a voltmeter. Use a digital voltmeter that
can display tenths or hundredths of a volt when measuring 10 to 30 volts.
Make your measurements when the battery has not been charged or
discharged for several hours. For a deep-cycle battery at 77º F (25º C), use
the following table:
Battery Voltage
12.7–13.0 V
12.5–12.6 V
12.3–12.4 V
12.1–12.2 V
11.9–12.0 V
State of Charge
100%
80%
60%
40%
20%
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