Blue Sky Solar Boost 3048L - Manual (Page 16)

Blue Sky Energy - Solar Boost 3048
15
MAXIMUM PV SHORT CIRCUIT CURRENT AND NEC
To be compliant with National Electrical Code (NEC), solar module controllers should be sized for 125% more rated capacity than
the 25
°C short circuit current (I
SC
) rating of the PV modules. Do not apply more than 40A Isc to the Solar Boost 3048.
GRID TIED SYSTEMS
Systems configured to sell excess PV power to the power grid use inverters specially designed for this purpose. In grid tied
systems it is the inverter that actually controls battery voltage and therefore battery charge. Maximum power will be delivered to the
grid if the Solar Boost 3048 remains in it’s bulk charge mode while selling to the grid. The key to having the Solar Boost 3048 stay in
bulk is to have it’s charge voltage setpoint be slightly higher than the charge voltage the inverter is regulating to. If possible, set the
Solar Boost 3048 for two stage charge. If the inverter uses temperature compensation, the Solar Boost must use it as well.
SOLAR BOOST 3048 SETUP
¾ Solar Boost 3048 has setup options that may need to be configured prior to connection and use. These
setup options are configured by setting a single 12 position dip switch and four potentiometers located on
the main circuit board as shown in Figure 3.
¾ Solar Boost 3048 a d’options de paramétrage dont la configuration pourrait être nécessaire avant le
branchement et l’utilisation. Ces options sont paramétrées en fixant un seul commutateur à 12 positions
et quatre potentiomètres situés sur le panneau du circuit principal (Voir Figure 3).
¾ Solar Boost 3048 hat Einstellungsoptionen, die vor der Einschaltung und Benutzung konfiguriert
werden müssen. Diese Einstellungsoptionen sind konfiguriert, indem ein einziger 12 Position Schalter und
vier Potentiometer die sich auf der Hauptstromkreistafel befinden wie in Abb. 3, eingestellt werden.
¾ El Solar Boost 3048 tiene opciones establecidas que pueden necesitar ser configuradas antes de la
conexión y el uso. Estas opciones establecidas son configuradas mediante un selector tipo “dip switch” y
cuatro potenciómetros localizados en la placa de circuito principal, según se muestra en la Figura 3.
As Shipped Default Factory Setup
• System
voltage................................................................................ 48V
• Temperature
compensation ............................................................ Disabled
•
Float transition current measurement ............................................. Internal shunt measuring output charge current
• Float
transition current .................................................................... 5.0A
• Charge
mode .................................................................................. 3 stage
• Acceptance
voltage ........................................................................ 57.2V
• Float
voltage ................................................................................... 53.2V
•
MPPT operating point (V
OC
– V
MP
).................................................. 4.4V Single 36 cell PV module
System Voltage
SWITCH
1
SWITCH
2
SWITCH
3
SWITCH
4
SWITCH
5
SYSTEM VOLTAGE
VOLTAGE SYSTEME
SYSTEMSTROMSPANNUNG
VOLTAJE DE LA SISTEMA
ON [1] ON [1] ON [1] OFF [0] OFF [0] 24VDC
OFF [0] OFF [0] OFF [0] ON [1] ON [1] 48VDC
ON [1] ON [1] ON [1] OFF [0] ON [1] 48VDC PV / 24VDC BATTERY
It is also possible to wire the PV array for 48V and charge a 24V battery by selecting the 48V PV / 24V battery mode. In this
48/24V operating mode a minimum PV input current of approximately 2.0 amps is required for MPPT to operate and PV voltage to
rise the desired operating point. When MPPT operates, output charge current will be approximately 2X or more PV input current.
This special operating mode can be quite useful for 24 volt systems with very long PV wiring lengths, as wire length can be four
times as long for a given wire size by doubling input voltage and halving input current as shown in Table 3. This operating mode can
also solve problems associated with very high temperature operation where conventional controllers cease to deliver current due to
temperature induced PV voltage reduction. In this mode input current should be limited to 12 amps.
Charge Mode
Solar Boost 3048 can be configured for two stage or three stage charging. Typically three stage charge is used, but certain
battery types or system configurations (such as grid tied systems) may benefit from two stage charge. When configured for two
stage charge, equalization still operates as described.
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