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SYMPTOM
PROBABLE CAUSE
Charge current is
Battery is highly charged
lower than expected,
PV current may be
low as well
Worn out PV modules
Low insolation
PV- connected to BAT-
MPPT improperly setup
Wrong PV input voltage
MPPT Current boost
PV maximum power voltage (V
is less than expected
leaving less power to be extracted
PV's hot
MPPT improperly setup
Wrong PV input voltage
System appears OK,
Not set for 3 stage charge
but will not correctly
switch between
System will not switch out of Bulk and into
Acceptance & Float
Acceptance or Float
System will not switch from Float to
Acceptance
System will not switch from Acceptance to
Float
At high ambient
System temporarily shuts down due to
temperature, charge
high heat sink temperature
turns off
ITEMS TO EXAMINE OR CORRECT
Normal operation, system will be in Acceptance or Float and current is reduced to
control battery voltage.
Replace, or use as is.
Atmospheric haze, PV's dirty, sun low on horizon, etc.
PV- & BAT- must be separate for proper operation. PV- must receive earth ground
via shunts inside the SB6024H which internally connect PV- to BAT-. External
connection prevents proper operation of internal shunts and measurement system.
Verify dip switch #5, verify proper MPPT setup and MPPT trim. See Maximum
Power Voltage and Optimizing MPPT sections.
SB6024H must operate with a higher PV array charging a lower voltage. PV array
input cannot be lower than nominal 36 volt, i.e. 3 series 36 cell modules.
) is low,
May result from PV's with low V
MP
and current boost potential. PV's with V
tend to work poorly.
Excessive PV wiring voltage drop due to undersize wiring, poor connections etc.,
consumes and wastes available power. This simulates having PV's with low V
Battery is nearly charged and battery voltage is high. Output during MPPT
operation is "constant power", higher battery voltage decreases charge current.
V
and available power decrease with increasing PV cell temperature. Cooler PV's
MP
will produce greater boost. It is normal for boost to decrease as temperature rises.
Verify dip switch #5, verify proper MPPT setup and MPPT trim. See Maximum
Power Voltage and Optimizing MPPT sections.
SB6024H must operate with a higher PV array charging a lower voltage. PV array
input cannot be lower than nominal 36 volt, i.e. 3 series 36 cell modules.
Double check dip switches #10 & 11
Battery is discharged to the point where net charge current cannot bring battery
voltage up to the desired charge voltage setpoint. PV power may be too low or
loads too high.
Battery may be fully charged. System will stay in Float and not switch to
Acceptance until charge current is greater than Float Transition Current setting. See
Float Transition Current Setpoint section. PV array may be too small for battery
amp-hours, consider using 2 stage charge.
External shunt is used and sense wires are wired reverse polarity. Verify charge
current polarity and magnitude using "I BAT" test point. See Float Transition Current
Measurement Shunt and Setpoint sections.
Battery may not be fully charged. System will not switch to Float until charge
current drops to less than the Float Transition Current setpoint during Acceptance.
See Float Transition Current Setpoint section.
Loads during charge may be high while using internal current shunt. Consider using
external shunt. See Float Transition Current Measurement Shunt section.
Improve ventilation or reduce PV power. Providing sufficient ventilation or operating
conditions which do not cause over temperature shut down will improve reliability.
See Technical Bulletin #100206.
Installation and Operation Manual
, as PV's with higher V
produce greater power
MP
MP
≥ 17V work best, PV's with <36 cells
MP
.
MP
26
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