Blue Sky SC30 User Manual
Page 9
Installation and Operation Manual
8
Restoring As Shipped Factory Default Settings
1. Remove both PV and battery power.
4. After at least 5 seconds, release Setup.
2. Apply battery power while pressing & holding the Setup push-button.
5. Confirm display resumes normal operation.
3. Following display self-test, confirm display shows software revision
6. The SC30 is now set to as shipped factory defaults.
(e.g.,
r1.4) & Charge Status LED’s remain on while Setup is held.
BATTERY AND PV WIRING
A desirable installation will produce a total system wiring voltage drop of 3% or less. The lengths shown in Table 3 are one way from the PV modules to the
battery with the SC30 located along the path. Wire length can be increased inversely proportional to actual current. If current was reduced by 1/2 wire lengths could
be doubled and still provide the same 3% voltage drop.
MAXIMUM CONDUCTOR PAIR LENGTH – 3% VOLTAGE DROP
WIRE GAUGE
AWG
12 VOLT SYSTEM @27A
FEET / METERS
12 AWG
4.8 / 1.5
10 AWG
7.6 / 2.3
8 AWG
12.0 / 3.7
6 AWG
19.2 / 5.9
4 AWG
30.3 / 9.2
2 AWG
48.3 / 14.7
TABLE 3
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CAUTION: Battery and PV compression terminals will accept #16
− #8 AWG wire and are to be tightened to 4.4 in-lb (0.50
nm). Temperature Sensor compression terminals accept #26
−14 AWG wire and are to be tightened to 2.1 in-lb (0.24 nm). Take
care to route and strain relief wires in a manner that does not place undue strain on the SC30’s compression terminal blocks.
WIRING DIAGRAM
FIGURE 3
OPTIONAL BATTERY TEMPERATURE SENSOR
Install the optional battery temperature sensor as shown in Figure 3. The temperature sensor will be automatically detected by the SC30.
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WARNING: Use only BSE temperature sensor p/n 930-0022-20. Other temperature sensors or electrical connections to the
temperature sensor terminals may damage the SC30, void the limited warranty, and may cause charge voltage to become
uncontrolled. Note that temperature sensor wires are polarized RED/BLK and the sensor will not function if installed reverse
polarity. The temperature sensor lug may connect to any battery terminal.