Blue Sky Solar Boost 3048L - Manual (Page 24)

Blue Sky Energy - Solar Boost 3048
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resistance and voltage drop. Note that the lengths shown in Table 3 are for a total PV short circuit current of 24 amps. If current is
halved, length can be doubled. If the preferred wiring described here is not practical or possible, the unit will still function properly but
current boost performance may be diminished.
OPTIONAL EXTERNAL CURRENT SHUNT
As described in the Float Transition Current Measurement Shunt section, charge control is enhanced through the use of an
external current shunt. If used, the external shunt should be installed in the battery negative cable and connected to Solar Boost
3048 as shown in Figure 3 so that it measures net battery current only. With net positive charge current going to the battery, the
signal polarity on the battery shunt terminal block must be
+/− as shown in Figure 3. This can be verified by measuring the voltage on
test points “I Bat” with respect to “Com”. The voltage should be positive with net positive charge current flowing, scaled appropriately
for the shunt installed
The external shunt may be an already existing shunt which is part of a separate monitoring system. As long as each system or
device connecting to the shunt connects to it with separate twisted pair cable directly to the shunt sensing terminals, there should be
no undesirable interaction between systems. Do not “daisy chain” shunt connections from multiple systems.
¾ Shunt polarity must be correct for proper operation. Do not connect to the Battery Shunt terminal block if
the external shunt is not used. Use twisted pair cable 18
−22 AWG for shunt signal wires.
¾ La polarité du shunt doit être correcte pour obtenir un bon fonctionnement. Ne pas brancher au bloc
terminal du shunt de la batterie si le shunt extérieur n’est pas utilisé. Utilisez une paire de câbles roulés
pour les câbles de signalaison du shunt.
¾ Die Schuntpolarität muß für eine geeignete Operation richtig sein. Bitte schalten Sie sie nicht zum
Batterieschuntterminalblock ein wenn der Außenschunt nicht verwendet ist. Verwenden Sie gedrehten
Parrkabel 18-22 AWG für Schuntsignalkabel.
¾ La polaridad del Shunt debe ser correcta para una operación apropiada. No conecte al bloque terminal del
shunt de batería si no está en uso el shunt externo. Use un cable “twisted pair” 18-22 AWG para los cables
de señal del shunt.
OPTIONAL DIGITAL DISPLAY
The digital display connects to the main circuit board connector as shown in Figure 3. Cabling uses standard RJ-45 8-pin
connectors, wired as shown in Figure 5. Non twisted pair cable is typically suitable for lengths up to 40ft/12.2m. Longer lengths
should use standard Category 5 twisted pair computer network cable, wired pin to pin with no swap.
Typical Category 5 unshielded twisted pair (UTP) cable wiring used for the remote display is shown in Figure 5. With a
Category 5 UTP cable, up to 300ft/91.4m of cable may be used. Longer lengths are possible and can be evaluated on an individual
basis. The remote display mounts into a standard duplex wall mount box. A digital display may also be mounted in the controller unit
(SB3048DL or SB3048PDL). If this is the case, the front panel display plugs into the Digital Display connector shown in Figure 3, and
the remote display cable plugs into the spare receptacle on the front panel digital display. The two receptacles on the digital display
are internally wired in parallel.
REMOTE DISPLAY CABLE SCHEMATIC
FIGURE 5
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