RV Power Products - Solar Boost 3048
17
1.
The power source must be able to operate open circuit. This is because Solar Boost 3048
uses series pass type control to lower output power when necessary. The input may go fully
open circuit when the battery is fully charged. Periodic open circuit operation is also used by
the MPPT system. Open circuit input voltage must not exceed 127V. Input power sources
requiring “shunt” type power control cannot be used with a Solar Boost 3048.
2.
If the input power source cannot supply all the input current necessary, the Solar Boost 3048
will select an input operating point based on it’s MPPT control algorithm so as to not overload
the input source. Input current can be estimated by;
input_current = output_current x
output_voltage
÷
input_voltage
. How well the MPPT system will work with a given input source
depends on the output impedance and output characteristics of the input power source. See
the Maximum Power Voltage and Optimizing MPPT sections for further discussion of the input
operating point. Generally, the input will be operated at some voltage level less that the input
open circuit voltage based on how MPPT is setup.
TROUBLESHOOTING GUIDE
SYMPTOM
PROBABLE CAUSE
ITEMS TO EXAMINE OR CORRECT
Completely dead, no
display
No battery power
Battery disconnected, overly discharged, or connected reverse
polarity. Battery powers the system, not PV.
Display OK, but
system will not turn
on (charge status
LED off)
PV disconnected
PV reverse polarity
PV- connected to BAT-
Verify PV connection. Requires PV to supply at least 0.15A at
3V more than battery voltage to begin charge.
Reverse polarity PV will cause heat sink to heat, and display to
show “negative” PV current if battery is connected.
PV- & BAT- must be separate for proper operation. PV- must
receive earth ground via shunts inside the SB3048 which
internally connect PV- to BAT-. External connection prevents
proper operation of internal shunts and measurement system.
Charge status LED
on in Bulk, but no
output charge current
Dip switches set for incorrect
system voltage
Temp sensor installed reverse
polarity or sensor failed short
Double check dip switches #1-5
Correct sensor polarity or replace sensor. Proper temp sensor
terminal voltage when connected is 2.98V at 25
°
C, changing at
+10mV/
°
C.
Charge status LED
on in Float or Accept.,
but no output charge
current
Battery voltage greater than
charge voltage setpoint
Dip switches set for incorrect
system voltage
Temp compensation enabled
without sensor installed or
sensor failed open
This is normal operation. Output is off due to high battery
voltage which may be caused by other charging systems.
Double check dip switches #1-5
Disable temp compensation, or replace sensor. Proper temp
sensor terminal voltage when connected is 2.98V at 25
°
C,
changing at +10mV/
°
C.
Charge status LED
on in Bulk, but no
output charge current
& relays click on/off
Dip switches set for incorrect
system voltage
Double check dip switches #1 & 2. Verify PV- and BAT- are not
connected together via earth GND or other connection.
Charge status LED
on in Float or Accept.,
relays click on/off
Charge current is very low and
the system is on the edge of
being able to stay on
If charge current is very low (
≈
0.1 – 0.2A) because battery
voltage is at setpoint, relays may switch on/off. This normal and
will cause no harm. The on/off symptom will go away with a
slight increase or decrease in battery voltage, or increase in
load.
Relays click on/off
rapidly
Dip switch #12 off
Double check dip switch #12, must always be on. Used for
factory test only.
Charge status LED
blinks rapidly, charge
voltage may be high
System in equalize mode
Disable equalize by pressing the equalize pushbutton.
