Installation Guide

MORNINGSTAR CORPORATION
47
4.0 OPERATION
46
• Do not wire multiple SunSaver MPPT load outputs
together in parallel to power DC loads with a current
draw greater than 15A. Equal current sharing cannot
be guaranteed and an over-load condition will likely
occur on one or more controllers.
• Exercise caution when connecting loads with specic
polarity to a live load circuit. A reverse polarity
connection may damage the load. Always double
check load connections before applying power.
4.5 Protections
Solar High Voltage Disconnect (HVD - temp. comp.)
(Charging status LED: R ashing) The battery is
protected against excessive solar voltage. With the battery
at 0.5V above its temperature compensated charging stage
set-point, the array will be disconnected. The reconnect
(HVR) will occur at 13.8 (12V system) or 27.6V (24V
system) .
Solar Overload
(No LED indication) The SunSaver MPPT will limit battery
current to the 15 Amp maximum rating. An over-sized
solar array will not operate at peak power. The solar array
should be less than the SS-MPPT nominal max. input power
rating for optimal performance. See Section 7.0 - Technical
Specications for more information.
Solar Short Circuit
(Charging Status LED: OFF) Solar input power wires are
short-circuited. Charging automatically resumes when the
short is cleared.
4.0
Load Short Circuit
(Battery Status LEDs: R/Y-G sequencing) Fully protected
against load wiring short-circuits. After two (2) automatic
load reconnect attempts (10 seconds between each
attempt), the fault must be cleared by removing and
re-applying power.
Load Overload
(Battery Status LEDs: R/Y-G sequencing) If the load
current exceeds the maximum load current rating, the SS-
MPPT will disconnect the load. The greater the overload the
faster the load will be disconnected. A small overload could
take a few minutes to disconnect.
The SS-MPPT will attempt to reconnect the load two (2)
times. Each attempt is approximately 10 seconds apart. If
the overload remains after two (2) attempts, the load will
remain disconnected until power is removed and re-applied.
Load High Voltage Disconnect (HVD)
(Battery status LEDs: G-R sequencing) Loads are
protected against excessive battery voltage. With the battery
at 15.3V for 12V nominal and 30.6V for 24V nominal, the
load will be disconnected. The reconnect (HVR) will occur
at 14.5 (12V system) or 29V (24V system).
High Voltage Input
(Charging Status LED: R ashing) If the solar input open
circuit voltage (V
oc
) exceeds the 75 Volt fault threshold, the
array will remain disconnected until the V
oc
falls safely back
below this voltage level. Maximum design input voltage
should not exceed 60.
Solar Reverse Polarity
(No LED indication) Fully protected against reverse solar
connection. No damage to the controller will result. Correct
the miswire to resume normal operation.