SAMLEX AMERICA INC. | 89
SECTION 5 |
Battery Charging in Evolution™ Series
5.8.2.1 Stage 1 – Bulk Charge Stage under 4-Stage Adaptive Charging Profile - Equalization
Refer to Section 1.4.3.1 for general information on Bulk Charge Stage and to Fig 5.2 for voltage and current curves
during this stage.
5.8.2.1.1
During the 1st “Bulk Charge Stage”, the batteries will be charged at constant current (CC) = the
programmed value of parameter “BULK CURRENT” (“Io”)
[Default value of Parameter “BULK CURRENT” is 20A.
See
programming range at Table 6.2 and programming procedure at Section 4.4.2.1 in the EVO-RC-PLUS Remote Control
Manual]
. The value of programmed parameter “BULK CURRENT” (“Io”) should normally be limited to 10% to 20%
of the Ah capacity of the battery [Ah capacity at C-rate of discharge = C/20 (or, 0.05C)]. Higher current may be used
if permitted by the battery manufacturer. The Bulk Charge Stage is displayed as “E-Bulk Stage” in the 2
nd
line of
Charging Mode Screens of EVO-RC-PLUS Remote Control.
[Please refer to (i) Display Screen Nos. 1 to 5 in Fig 3.3(c)
under Section 3.6.4.3 of EVO-RC-PLUS Remote Control Manual and, (ii) codes / abbreviations in Table 3.2 under
Section 3.6.4.4 of EVO-RC-PLUS Remote Control Manual].
5.8.2.1.2
A Software Timer is used to measure the time taken from the time the unit enters Bulk Stage to the time
the battery voltage reaches 0.3V below the programmed value of parameter “ABSORP VOLTAGE”
[Default value
of parameter “ABSORP VOLTAGE” is 57.6V for EVO-4248SP. See programming range at Table 6.2, Section 6 and
programming procedure at Section 4.4.2.2 in the EVO-RC-PLUS Remote Control Manual]
. This time is registered as
Bulk Stage Time “To”.
As part of Adaptive Algorithm, the following times are computed based on the Bulk
Stage Time “To”:
a) Absorption Stage Time T1' =
To x 0.5
b) Equalization Stage Time T2:
i. T2 = T1' + 1 Hr = (To x 0.5) +1 Hr ; if T1' is <2 Hrs
ii. T2 = T1' + 2 Hrs = (To x 0.5) +2 Hr ; if T1' is > 2 Hrs but <4 Hrs
iii. T2 = T1' + 4 Hrs = (To x 0.5) +4 Hr ; if T1' is > 4 Hrs
5.8.2.1.3
When the battery voltage rises to the programmed value of parameter “ABSORP VOLTAGE”, the charging
stage transitions to the next Stage 2 – Absorption Stage described at Section 5.8.2.2
[Default value of parameter
“ABSORP VOLTAGE” is 57.6V for EVO-4248SP. See programming range at Table 6.2, Section 6 and programming
procedure at Section 4.4.2.2 in the EVO-RC-PLUS Remote Control Manual]
.
5.8.2.1.4 Automatic Adjustment of Internal AC Charger Current when External Solar Charge Controller
is also Charging in Parallel
Please note that if an external solar charge controller is also used to charge the batteries at the same time in parallel
with the internal AC charger of the unit, the charging current of the internal AC charger will be controlled so that the
total charging current of the external charger and the internal charger is = the programmed "BULK CURRENT (
“Io”
)
[See Section 4.4.2.1 of EVO-RC-PLUS Remote Control Manual].
For example, if the programmed value of parameter “BULK CURRENT” (
“Io”
) is say 40A and the charging current
from the external Solar Charge Controller is say 30A at any given instant, the internal AC charger will output only
10A (
Programmed value of 40A minus external charging current of 30A = 10A
). Now, if the charging current from
the External Charge Controller rises to say 50A, the internal AC charger will be reduced to 0A.
Please refer to Section 5.4 for more details.
Summary of Contents for Evolution EVO-4248SP
Page 115: ...SAMLEX AMERICA INC 115 NOTES...
