Mornignstar SunSaverDuo Field Testing Instructions

SunSaver Duo Field Test Document
Morningstar Corporation
7 v1.0
Error Codes
E01 – Reverse Polarity, Solar Input
The Solar panel is connected backwards to the SunSaver Duo Solar input connection.
Disconnecting the solar panel should clear the error immediately. Reconnect with correct
polarity. Use red wire for Solar positive (+) and black wire for Solar negative(-). If the reverse
connection mistake is at the solar panel j-box, correct the mistake in the J-box so that the red
wire is positive and black is negative.
E02 – Reverse Polarity, Battery #1
A battery is connected backwards to the SunSaver Duo Battery #1 connection. Disconnecting
the battery should clear the error immediately. Reconnect with correct polarity. Use red wire
for Battery positive (+) and black wire for Battery negative (-). If the reverse connection
mistake is at the battery posts, correct the mistake at the posts so that the red wire is positive
and black is negative.
E03 – Reverse Polarity, Battery #2
A battery is connected backwards to the SunSaver Duo Battery #2 connection. Disconnecting
the battery should clear the error immediately. Reconnect with correct polarity. Use red wire
for Battery positive (+) and black wire for Battery negative (-). If the reverse connection
mistake is at the battery posts, correct the mistake at the posts so that the red wire is positive
and black is negative.
E04 – Local Temperature Sensor Damaged
The sensor on the SunSaver Duo that measures ambient temperature has been damaged. A
shorted or open sensor sets this error. Charging stops until this error is cleared. Inspect the
“Temp. Sensor” for debris or breaks. The SunSaver Duo may have to be returned to your
authorized Morningstar dealer for service.
E05 – Remote Temperature Sensor Damaged or Removed
An optional Remote Temperature Sensor (RTS) connected to the SunSaver Duo is either
open or shorted. In most cases, the RTS connection simply has come loose. Check the screw
terminal connections. If the error persists, check the RTS cable for pinches or breaks.
E06 – Over-current Protection
Solar input current exceeds the 25A rating. Reduce the size of the solar panel array. Also
check wiring. A battery wired to the Solar input connection can cause this error.
E07 – High Temperature Protection
The internal heatsink temperature sensor has detected a temperature that exceeds the safe
operating limit. This error will clear when the SunSaver Duo cools off. If this error occurs
frequently, consider reducing the solar input current and/or moving the SunSaver duo to a
cooler location with better air flow.
E08 – High Voltage Disconnect
Battery #1 or Battery #2 voltage has exceeded the 15.5 V HVD threshold. The SunSaver Duo
will not charge a battery above 15.0 V (max. regulation voltage). In most situations, another
charging source such as a vehicle alternator or dock shore power is charging a battery too
high. This will not damage the SunSaver Duo and the error will automatically clear when the
charging source stops and the battery voltage returns below 14.0 V. If there are no other
charging sources in the system, the SunSaver Duo itself may be damaged. Follow the test
instructions to check correct operation.