Bogart Engineering SC-2030 Technical Manual

Bogart Engineering
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The chart below shows the voltages used depending on how the jumpers have been set. It begins charging at
maximum solar current until it reaches the limiting "absorb" voltage shown. After that it charges for an absorb time of
two hours. Then it regulates at the float voltage shown.
Table 3: Shows “absorb volts” and “float volts” for jumper settings –TM-2030 not connected
SC-2030
Battery type jumper
setting
System
Voltage
jumper setting
Absorb voltage (temperature
compensated to 25º C if sensor is
connected)
Float voltage
(after 2 hours at
Absorb)
Liquid electrolyte
12V
14.7V
13.2V
Gel or AGM
12V
14.2V
13.2V
Liquid electrolyte
24V
29V
26.4V
Gel or AGM
24V
28.4V
26.4V
6.4 Two Graphs of charging profiles for SC-2030 when TM-2030 is connected
The first profile (page 14, figure 2) is more typical of most good solar chargers. However the SC-2030 has an additional
unusual option of setting a "percentage of overcharge" value compared to last discharge from 100 to 120%.
The second profile (page 15, figure 3) adds a higher voltage "finishing absorb," current limited charging stage, to safely
more fully charge batteries as they become more resistant to charging, originally intended for lead acid liquid
electrolyte (wet cell) types—but now some companies are recommending this for AGM batteries too .
Each profile shows the program values that you use with the TM-2030 to adjust the charging; these are identified by the
"P1, P2, etc which identify values that you enter using theTM-2030.
Important note about settings for P2 and P21. These are percent settings that refer to the percentage of the value
programmed into P3. For example, for P2 the "amps" set point equals the value in P2 (in percent) times the P3 value.
Similarly, P21 (max Amps finish value) is also referenced as a percent of the P3 setting.
The P8 “high voltage limit” setting is not installed by the install profile. Some systems (often in RV’s) don’t allow
battery voltage as high as typically recommended for properly charging batteries. If you must impose a maximum
voltage limit, use program P8 to set voltage from exceeding this value, even during low temperature--although this
could compromise ideal charging. To disable, place it to a voltage that your system will never reach, such as 65.0V.
The P22 "battery install profile" setting automatically writes 8 values shown below (EXCEPT P8) as shown in Table
4 below. Always enter P22 first. After that any other values may be changed individually if desired. If you find a
profile set that has most of the values you want, first enter that profile, then change the ones that you want to be
different. Presently there are 18 profiles available. We may add more in the future in later revisions of the TM-2030.
If you wish to use a “conventional” type charge profile, typical of most controllers manufactured today, this may be
easily accomplished by setting program P21 to “OFF”, as described near the top of page 14. Or use profiles 17 or 18
when entering a charging profile in P22. All of the profiles, except P17 and P18 have an extra “higher voltage finish
charge” to give a more thorough charge, which is recommended by many battery companies, including some
manufacturers of AGM type batteries.
P1: Absorb volts: When charging begins, the maximum solar current is sent to the batteries until this voltage is
reached. Then the charger limits voltage to this value. (10.0-65.0)
P2: Charged setpoint. The “amps charged setpoint” is equal to P2, expressed as a percentage from 0.0-10.0%, times
P3 (battery capacity). When battery voltage is equal or greater than P1, (when the TM-2030 is in Levels 1-3) and
the amps drops to P2 times P3, the batteries are signaled as "charged." (In Level 4, the standard is much higher:
batteries must go into float mode before they are signaled as “charged”.)
P3: Total battery system capacity (in amp hours). (10-10,000 amp hours)
P8: Absolute max permitted charging voltage: Default=65.0. Adjust this (if necessary) to limit the maximum
charging voltage allowed, for example if temperature compensation raises voltage in cold conditions beyond what
is permissible for other devices connected to the battery that can’t tolerate the voltage that would otherwise be
desirable for proper battery charging. Note that P15 is the battery limit. P8 can prevent P15 from being reached.
P14: Limit timer for charging, before going into "Float" described in the profile graphs. (0.0-25.0 hours)
P15: Finish charge (high) voltage limit—allowed only after the amps drop below the P21 current limit. (10.0-65.0)
P16: Float voltage (10.0-65.0)
P20: Percent of overcharge before going into "float" (0-20%).
P21: Finish charge Amps limit (expressed as a percentage of P3) below which amps must be to rise above P1 voltage