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Operations Manual | 13
Discharging
a. The discharge can start if the system is in a Standby State or Charge State.
b. If current draw is between -2Amp to -800Amp the system will enter a Discharge State.
c. Discharge will end upon any of these conditions:
•
String Voltage < 380V (38 BC)
•
Any 3 Monoblock < 10V
•
Any 3 Monoblock reaches 75°C
•
Current <= -800A
d. The BMS will open the breaker if any of the above conditions are met.
e. Alternatively, the UPS can open the circuit breaker via the UVR / Shunt relay.
f. Specification: (Notes: Data Sheet & Table below)
g. After a discharge, all batteries must fall below 40°C before recharge begins.
h. Maximum current is 800Amps. Any current over 800Amps for 2s will result in the BMS remotely tripping the
circuit breaker.
i. The breaker is set to trip at 2500A for a dead short circuit.
Controls Parameters
All parameters are shown as expected. It is understood there are tolerances associated with the hardware regarding
resolution of each parameter.
Item
Parameter
Number of
Batteries
Operation
Min/Max
Warning
Error /
Fault
Critical
Alarm
7
(X)
Comments
1a
BPOV - Battery pack total voltage
overvoltage (V)
36
551
547
555
X
The BPOV is a hard upper limit for EOC Voltage. The normal
EOC is when current is below 4A and system voltage is above
a minimum threshold at BPOV – 14 V.
1b
BPOV - Battery pack total overvoltage
(V)
37
566
562
570
X
The BPOV is a hard upper limit for EOC Voltage. The normal
EOC is when current is below 4A and system voltage is above
a minimum threshold at BPOV – 14 V.
1c
BPOV - Battery pack total voltage
overvoltage (V)
38
581
578
585
X
The BPOV is a hard upper limit for EOC Voltage. The normal
EOC is when current is below 4A and system voltage is above
a minimum threshold at BPOV – 14 V.
1d
BPOV - Battery pack total voltage
overvoltage (V)
39
596
593
600
X
The BPOV is a hard upper limit for EOC Voltage. The normal
EOC is when current is below 4A and system voltage is above
a minimum threshold at BPOV – 14 V.
2a
BPUV - Battery pack total voltage
undervoltage (V)
36
360
369
346
336
X
2b
BPUV - Battery pack total voltage
undervoltage (V)
37
370
380
355
346
X
2c
BPUV - Battery pack total voltage
undervoltage (V)
38
380
390
365
355
X
2d
BPUV - Battery pack total voltage
undervoltage (V)
39
390
400
374
364
X
3
SBOV - Single battery (cell) overvoltage
(V)
15.5
15.6
3.925
2
X
Added 0.1 V for buffer (3.925 * 4 = 15.7)(critical alarm is ¼
the battery voltage, ¼ * 15.7 =3.9).
4
SBUV - Single battery (cell) under
voltage (V)
10
8.6
0
2
X
5
Battery Low Flag Counter limit (Battlow)
1, 2, 3
X
Flag incremented for each battery < 10V during a discharge
and the number of times a specific battery position exceeds
the limit must be captured.
6
Over temperature when charging or
discharging (°C)
None
1
75
85
X
System keeps running up to 85C reached at battery.
7
Battery (High) Temperature Flag
Counter limit (Num Batt T High)
1, 2, 3
X
Flag incremented for each battery >75°C during a discharge
and the number of times a specific battery position exceeds
the limit must be captured.
8
Low temperature when charging (°C)
None
1
< 20
none
No safety issue. Warning < 20C.
9
Over current when fast charge (A)
160
180
X
Added 10% buffer.
10
Over current when discharge (A)
-800
6
-1000
X
Spec
11
Diode Temperature (°C)
100
X
Used table with 1000A estimate used.
12
Contactor Temperature (°C)
150
X
Measured at Terminal. Terminal temperature.
13
ADAh
4
(Ah)
< 0
5
<-40
X
14
Contactor Stuck Closed in Standby
X
X
If in Standby and Current >2A AND (String Voltage = Inverter
Voltage) (+/- 5V) then Generate Error/Fault Alarm
15
Power Supply Voltage Low
<=21V
16
Power Supply Voltage High
>=32.5V