4.0 OPERATION
MORNINGSTAR CORPORATION
29
4.0
LVD Warning
As the battery discharges the
Battery Status
LEDs will
transition from green to yellow and then from yellow to
ashing red. The
ashing red indication is a warning that a
low voltage disconnect event will occur soon. The amount of
time between a green SOC indication and load disconnect
will depend on many factors including:
rate of discharge (amount of load draw)
•
capacity of the battery
•
health of the battery
•
LVD setpoint
•
If the battery discharges to the LVD setpoint the load will
disconnect and a solid red Battery Status LED indication
will be displayed.
General Load Control Notes
A 15 V maximum regulation voltage limit (30 V @ 24 V
•
nominal) exists for all battery types. This limit ensures
that the battery and load terminal voltages will never
exceed 15 V/30 V. This protects certain DC loads that
may be damaged by high input voltage.
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 connec-
tion may damage the load. Always double check load
connections before applying power.
4.5 Protections
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
fi
cations
for more information.
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 reapplied.
Solar Short Circuit
(Charging Status LED: OFF) Solar input power wires are
short-circuited. Charging automatically resumes when the
short is cleared.
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
reapplying power.
