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Front Panel Controls and Indicators
975-0012-01-02 Rev A 3–9
Over Discharge Protection (ODP)
When enabled, ODP shuts down the inverter at a specified voltage (low battery
cutoff) to protect the batteries from over discharge damage. The inverter circuitry
calculates the lowest (safe) DC voltage (leaving approximately 20% battery
capacity) based on the position the Battery Type Selector switch and the amount
of current drawn by the load. Under no-load conditions this level is typically
between 11.8 and 12.0 Vdc (for a 12-volt battery bank).
Important:
The range of set points between 2 and 5 o’clock also determine the low AC
Transfer Voltage. This must be considered when adjusting this potentiometer with ODP
enabled (see Table 3-3).
Important:
When ODP is disabled (set points between 9 and 1 o’clock), the inverter is
programmed to shut OFF when the batteries reach approximately 8.5 Vdc (1.4166 V/cell)
for 12-Vdc systems (17 Vdc for 24-volt systems).
Figure 3-5
ODP Enabled/Disabled Positions
Figure 3-6
Automatically Calculated Discharge Cutoff Voltage per Cell
ODP Disabled
Range
ODP Enabled
Range
1
0.1
0.01
0.001
Discharge Rate/Battery Capacity
1.55
1.5
1.65
1.6
1.75
1.7
1.85
1.8
1.95
1.9
2
Cell Voltage
12 Vdc
9.0
9.6
10.2
10.8
11.4
12.0
24 Vdc
18.0
19.2
20.4
21.6
22.8
24.0