17
% of Nominal Capacity
Unit Voltage
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 110%
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
Nominal Capacity = C
8
= 77Ah
0ºC
+ 5ºC
+ 25ºC
+ 40ºC
Figure 7. Discharge characteristics of the Evolion at 1750 W and at different temperatures.
7.1 Discharge performance factors
The Evolion has a rated capacity and energy based on a fully charged battery at 56 Vdc and at 25°C (77°F) when discharged at the 8
hour discharge rate for 8 hours of runtime to a 42 Vdc cut-off. When conditions deviate from this, the available capacity on discharge is
affected and can be accounted for by the following derating factors.
Variable
Type
Description
Diagram
f
T
Low temperature derating
without
heater operation
Accounts for the decrease in utilized discharge
capacity between 10°C to 25°C (50°F to 77°F).
External factor.
f
Th
Low temperature derating
with
heater operation
Accounts for the decrease in utilized discharge
capacity below 10°C. External factor.
f
Vch
Lower than 56.0 Vdc charge
voltage set point
Accounts for the lower state of charge encountered
when the charge setpoint is below 56 Vdc. External
factor.
f
EODV
Higher than 42.0 Vdc
discharge cut-off voltage
Accounts for the decrease in the utilized discharge
capacity when the discharge cut-off voltage is
higher than 42.0 Vdc. External factor.
f
aging
End of life performance
Accounts for the guarantee of performance at the
end of predetermined life (years). External factor.
f
IL
Internal load
Accounts for internal load of the Evolion or the
heartbeat load for the micro circuits. Accounted for
in the performance table or rate table.
All derating factors except f
IL
are external factors and must be accounted for separately when conducting a sizing calculation. The
factor f
IL
is automatically included in the performance table or rate table and does not need to be applied separately. See chapter
Battery sizing for more details on the application of these derating factors.
To estimate the value for each external derating factor, use the graphs in Appendix D.
Important note: Pressing the ON/OFF button while the module is loaded with charge or discharge current may damage the power
board. It is recommended to breaker open the load or rectifier output before pushing the ON/OFF button.
•
The maximum discharge current is exceeded (see section Maximum discharge current)
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