Troubleshooting guide – Blue Sky Solar Boost 3024iL User Manual
Page 13
Installation and Operation Manual
12
TROUBLESHOOTING GUIDE
SYMPTOM
PROBABLE CAUSE
ITEMS TO EXAMINE OR CORRECT
Completely dead, no
display
No battery power
Battery disconnected, overly discharged (<9V), or connected reverse polarity.
Battery powers unit, not PV.
Unit will not turn on
(charge status LED
off), Display if
present may be OK
PV disconnected
PV reverse polarity
IPN network address set wrong
Low battery power
Extreme voltage fluctuations or
interference has caused microprocessor
lock-up
PV must supply at least 0.15A at just above battery voltage to begin charge.
Reverse polarity PV will cause heat sink to heat.
A single unit must be set to IPN network address 0 (zero). One unit of a multi-unit
network must be set to IPN network address 0 (zero), AND all other units must be
set to different addresses.
Battery overly discharged (<9V). Battery powers unit, not PV.
Reboot microprocessor by momentarily removing all power. Reattach power crisply.
Unit cycles on/off
PV- connected to BAT- external to unit
PV- & BAT- must be separate external to the unit for proper operation and cannot
connect to a common location. External connection prevents proper operation of
internal shunts and current measurement system.
Charge status LED
on., but no output
charge current
Battery voltage greater than charge
voltage setpoint
Battery voltage too low
Unit recognized battery voltage to be 12V
when it is actually 24V
This is normal operation. Output is off due to high battery voltage which may be
caused by other charging systems.
Battery voltage must be at least 9V for the unit to operate.
Battery voltage is determined automatically when the unit first receives power.
Voltage must be greater than 16V to recognize battery as 24V. Remove all power,
and reapply battery quickly and crisply.
Charge status LED
blinks rapidly
System in equalize mode
Disable equalize via IPN-ProRemote, or by turning DIP switch #5 off.
Charge current is
lower than expected,
PV current may be
low as well
Battery is highly charged
Worn out PV modules
Low insolation
PV- connected to BAT-
Nominal PV voltage has changed from
18V or 24V to 12V
Current limit has switched to 30A
Normal operation, current is reduced if battery voltage is at setpoint.
Replace, or use as is.
Atmospheric haze, PV’s dirty, sun low on horizon, etc.
PV- & BAT- must be separate external to the unit for proper operation and cannot
connect to a common location. External connection prevents proper operation of
internal shunts and current measurement system.
If PV voltage is changed to 12V, all power must be removed momentarily to reboot
unit and load initial PV control values.
Normal operation. Current limit will change to 30A if PV V
OC
has exceeded 30V
which will occur with greater than 12V nominal PV’s. Reconfigure PV’s for 12V and
reboot 3024 to resume 40A current limit.
MPPT Current boost
is less than expected
PV maximum power voltage (V
MP
) is not
much higher than battery voltage, leaving
little extra power to be extracted
PV’s hot
Nominal PV voltage has changed from
18V or 24V to 12V
PV’s with low V
MP
.
PV’s with higher V
MP
produce greater power and current boost
potential. PV’s with V
MP
≥ 17V work best.
Excessive PV wiring voltage drop due to undersize wiring, poor connections etc.
Battery is nearly charged and battery voltage is high. Output during MPPT
operation is “constant power”, higher battery voltage reduces charge current
increase.
V
MP
and available power decrease with increasing PV cell temperature. Cooler PV’s
will produce greater boost. It is normal for boost to decrease as temperature rises.
If PV voltage is changed from to 12V, all power must be removed momentarily to
reboot unit and load initial PV control values.
Auxiliary battery not
charging
Auxiliary output not configured for
auxiliary battery charge
Primary battery not highly charged
Load on Auxiliary battery too high
Confirm dip switch #4 is OFF.
Auxiliary battery will not receive charge unless primary battery is highly charged in
Acceptance or Float.
Maximum auxiliary charge current is roughly 2A. Load may need to be reduced.