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TROUBLESHOOTING GUIDE
SYMPTOM
PROBABLE CAUSE
Completely dead,
No battery power
optional display blank
Unit will not turn ON
PV disconnected or low in voltage
(charge status indicator
PV reverse polarity
OFF), Display if
attached is ON
IPN network address set wrong
Microprocessor lockup
Charge status indicator
Battery voltage greater than charge voltage
ON., but no output
setpoint
charge current
Battery voltage too low
PV- connected to BAT- external to controller
Charge status indicator
System in equalize mode
blinks rapidly
Charge OFF at high
System temporarily shuts down due to high
ambient temperature
heat sink temperature
Charge current is lower
Battery is highly charged
than expected, PV
Worn out or dissimilar PV modules
current may be low as
well
Low insolation
PV- connected to BAT-
MPPT Current boost is
PV maximum power voltage (V
less than expected
much higher than battery voltage, leaving
little extra power to be extracted
PV's hot
Worn out or dissimilar PV modules
Auxiliary battery not
Not configured for auxiliary battery charge
being charging
Primary battery not highly charged
Load on Auxiliary battery too high
System appears OK,
Not set for 3 stage charge
but will not switch
Will not switch out of Bulk and into
between Bulk,
Acceptance or Float
Acceptance & Float
Will not switch from Acceptance to Float
Load control not
Auxiliary output not set for load control
working
Output may have shut off due to low battery
charge
ON/OFF thresholds set incorrectly
Dusk-to-Dawn feature,
Auxiliary output not set for load control
lights will not turn ON or
Output may have shut off due to low battery
remain ON
charge
Charge control system ON
Timers set incorrectly
Valid night time period not seen
Dusk-to-Dawn feature,
Auxiliary output not set for load control
lights will not turn OFF
Timers set incorrectly
Charge control does not turn ON
ITEMS TO EXAMINE OR CORRECT
Battery disconnected, overly discharged, or connected reverse polarity. Battery powers the 1524,
not PV.
PV must supply 0.10 amps at greater than battery voltage to begin charge.
Reverse polarity PV will cause front 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.
Momentarily remove all power to re-boot.
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 1524 to operate.
PV- & BAT- must be separate for proper operation. PV- must receive earth ground via shunts
inside the 1524 which internally connect PV- to BAT-. External connection prevents proper
operation of current measurement system.
Disable equalize via IPN-ProRemote, or by turning DIP switch #4 off.
Improve ventilation or reduce PV power. Sufficient ventilation to prevent over temperature shut
down will improve reliability. See Technical Bulletin #100206.
Normal operation, current is reduced if battery voltage is at setpoint.
Replace, or use as is.
Atmospheric haze, PV's dirty or shaded, sun low on horizon, etc.
PV- & BAT- must be separate for proper operation. PV- must receive earth ground via shunts
inside the 1524 which internally connect PV- to BAT-. External connection prevents proper
operation of current measurement system.
) is not
PV's with low V
. PV's with higher V
MP
MP
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
and available power decrease with increasing PV cell temperature. Cooler PV's will produce
MP
greater boost. It is normal for boost to decrease as PV temperature rises.
Replace, use as is, or use different controller for different PV modules.
Confirm dip switch #3 is OFF.
Auxiliary battery will not receive charge unless primary battery is in Acceptance or Float.
Maximum auxiliary charge current is roughly 2 amps. Load may need to be reduced.
Double check Float voltage setpoint.
Battery is so discharged that 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 not fully charged. Unit will not switch to Float until battery voltage remains at the
Acceptance voltage setpoint continuously for the Charge Time period (or net battery current
drops to the Float Transition Current setpoint if using IPN-ProRemote).
Confirm dip switch #3 is ON.
Load will shut off if battery voltage drops below OFF threshold (default 11.5V). Once shut off, the
load will not come back on until battery voltage is above ON threshold (default 12.6V).
Correct ON/OFF threshold settings.
Confirm dip switch #3 is ON and Dusk-to-Dawn enabled.
Load turns off if battery voltage below OFF threshold (default 11.5/23.0V). Once off, the load will
remain off until battery voltage is above ON threshold (default 12.6/25.2V).
Lights will not turn on if charge control system is ON and charging.
Check time settings Post-Dusk or Pre-dawn timer.
Pre-Dawn lighting will not operate until a valid night time period of >4 hours detected. If PV was
removed/reconnected, night time period may be inaccurate. Remove & restore power to reboot
Confirm dip switch #3 is ON and Dusk-to-Dawn enabled.
Either Post-Dusk or Pre-dawn timers must be set to time value to enable Dusk-to-Dawn feature.
Check charge control system related items
Installation and Operation Manual
work best, PV's with <36 cells tend to work poorly.
MP
10
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