42 | SAMLEX AMERICA INC.
SECTION 4 | Parameter Setup
4.4.2 Description of Parameters under Group 1 - CHARGE CURVE
4.4.2.1 BULK CURRENT (Table 4.3, Screen No. 1)
Parameter "BULK CURRENT" sets the maximum charging current during the Bulk Charging Stage. The default value
is 20A for EVO-1212F / 1212F-HW, 20A for EVO-1224F / 1224F-HW and 40A for EVO-2212 / EVO-3012 / EVO-2224
/ EVO-4024.
Normally, Lead Acid batteries should not be charged at very high Bulk Current as this may damage the batteries due
to overheating and cell degradation. Normal Bulk Charging Current is in the range of 10% to 20% of the Ah capacity
of the battery bank at C/20 Discharge Rate. Lithium Ion Batteries can be charged at much higher Bulk Current as
compared to Lead Acid type. Check with the battery manufacturer regarding recommended Bulk Charging Current for
your battery bank.
INFO
1. In order to protect against over temperature shut down when operating in higher ambient temperatures,
the set value of “BULK CURRENT” is automatically reduced as follows based on temperature sensed at the
Power Transformer and at the Heat Sink for the Power Mosfets:
a) Models: EVO-2212, EVO-3012, EVO-2224 and EVO-4024
• Power Transformer Temperature > 130°C: (i) EVO-2212: Reduce by 4A every 10 sec, (ii) EVO-
3012: Reduce by 20A every 10 sec, (iii) EVO-2224: Reduce by 1A every 10 sec, (iv) EVO-4024:
Reduce by 5A every 10 sec.
• Heat Sink Temperature is > 65 °C: (i) EVO-2212: Reduce by 4A every 10 sec, (ii) EVO-3012:
Reduce by 20A every 10 sec, (iii) EVO-2224: Reduce by 1A every 10 sec, (iv) EVO-4024: Reduce
by 5A every 10 sec.
b) Models EVO-1212F, EVO-1212F-HW, EVO-1224F and EVO-1224F-HW
• Power Transformer Temperature > 130°C: Reduce by 0.2% every 20 sec
• Heat Sink Temperature is > 90 °C: Reduce by 0.2% every 20 sec
2. In case external Solar Charge Controller is also charging the batteries through DC input terminals marked
"EXT Charger", the amount of Bulk Charging current producted by the internal Battery Charging Section
is adjusted in real time to satisfy the following condition:
• Internal Bulk Charging Current = Programmed Value of "BULK CURRENT" – External Charging
Current
For example, if the "BULK CURRENT" in the EVO-1212F is programmed at say the default value of 20A and the
external Solar Charge Controller is generating 15A, the internal Battery Charging Section of EVO-1212F will
reduce its current from 20A to 5A so that the net charging current is equal to the programmed "BULK CURRENT"
value of 20A.
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