Troubleshooting Guide - BLUE SKY SOLAR BOOST 2000E Installation And Operation Manual

functioning and adjustment can be made. Verify that the LED remains on at the maximum current adjustment point, and as you check for a slight drop in
current on either side of the maximum point. If LED does not remain on, MPPT is not operating due to a combination of high PV temperature and/or high
battery voltage. MPPT can usually be made to operate by lowering battery voltage through application of a heavy DC load. If in doubt, leave the adjustment
at the factory default position of midway between 11:00 and 12:00 o'clock as shown in Figure 3. Note that the LED briefly turns off every 10 seconds while
the system recalculates the MPPT operating point.

TROUBLESHOOTING GUIDE

SYMPTOM PROBABLE CAUSE
Completely dead, no No battery power
display
Display OK, but PV disconnected
system will not turn on
PV reverse polarity
(charge status LED
off)
PV- connected to BAT-
Charge status LED on Dip switches set incorrectly
in Bulk, but no output
Low PV power
charge current
Charge status LED on Battery voltage greater than
& blinking in Constant charge voltage setpoint
Voltage mode but no
Temp comp. enabled without
output charge current
sensor, or sensor failed open
Battery voltage too low
Charge status LED on Charge current is very low and
in Constant Voltage, the system is on the edge of
relays click on/off being able to stay on
PV- connected to BAT-
Relays click on/off Dip switch #2 off
rapidly
Charge status LED System in equalize mode
blinking, charge
Temp sensor failed short, or
voltage high
installed reverse polarity
Charge current is Battery is highly charged
lower than expected,
PV current may be low
Worn out PV modules
as well
Low insolation
PV- connected to BAT-
MPPT improperly setup
MPPT Current boost is PV maximum power voltage
less than expected (V
MP
battery voltage, leaving little
extra power to be extracted
PV's hot
MPPT improperly setup
At high temperature, System temporarily shuts
unit shuts down down due to high temperature
ITEMS TO EXAMINE OR CORRECT
Battery disconnected, overly discharged, or connected reverse polarity. Battery powers the
system, not PV. Battery voltage must be present for unit to operate.
Verify PV connection. Requires PV to supply at least 0.15A at ≈14V to begin charge.
Reverse polarity PV will cause front panel 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
in the 2000E which internally connect PV- to BAT-. External connection prevents proper
operation of the internal current measurement system.
Double check dip switches #1-4.
Correct PV's.
This is normal operation. Output is off due to high battery voltage which may be caused by
other charging systems.
Disable temp compensation, or replace sensor. Proper temp sensor terminal voltage when
connected is 2.98V at 25°C, changing at +10mV/°C.
A minimum battery voltage of ≈9.0V is required for the unit to operate.
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 load current.
PV- & BAT- must not connect together external to controller for proper operation.
Double check dip switch #2, must always be on. Used for factory test only.
Disable equalize by pressing the equalize pushbutton.
Replace sensor, or remove sensor and disable temp compensation. Proper temp sensor
terminal voltage when connected is 2.98V at 25°C, changing at +10mV/°C.
Normal operation, system will be in Constant Voltage mode 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 2000E which internally connect PV- to BAT-. External connection prevents proper
operation of the internal current measurement system.
See Maximum Power Voltage and Optimizing MPPT sections.
May result from PV's with low V
) is not much higher than
boost potential. PV's with V
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 near setpoint. Output during MPPT operation
is "constant power" so higher battery voltage produces less charge current.
V
MP
produce greater boost. MPPT LED off indicates that extra power is not available from PV
array. It is normal for boost to decrease as temperature rises.
See Maximum Power Voltage and Optimizing MPPT sections.
Improve ventilation or reduce PV power. Providing sufficient ventilation or operating
conditions which do not cause over temperature shut down will improve reliability.
PV's with higher V
MP.
≥ 17V work best, PV's with <36 cells tend to work poorly.
MP
and available power decrease with increasing PV cell temperature. Cooler PV's will
Installation and Operation Manual
produce greater power and current
MP
.
MP
8