BATTERY AND SOLAR PANEL FUSE CHART
BATTERY TEMPERATURE SENSOR:
Position the battery temperature sensor on or near the main
battery. If the main battery is in a non-heated location, place the battery temperature sensor outside of the
heated area that the MPPT250 is installed.
FLOAT VOLTAGE CALIBRATION
:
Battery float voltage is pre-calibrated to 14. 1 volts.
In most installations the float voltage needs no adjustment. Check battery manufacturers
specifications for proper float voltage.
To adjust the battery float voltage locate the float voltage control on the rear of the MPPT250. Let
the battery charge up to 14.1 volts ( the red float LED will light ) before adjusting the float control. Adjust
the float voltage counter clockwise to lower the float voltage and clockwise to increase the voltage. Adjust
the float control in small increments until the desired voltage is displayed on the MPPT250 volt meter.
In
order to properly charge the battery over a wide temperature range, the battery float voltage is temperature
compensated. Battery voltage will be higher in cold temperatures and lower in warm temperatures. Secure
battery temperature on or near the main battery.
BOOST CURRENT:
The solar panel produces higher output voltage than the battery voltage. This higher
voltage, the maximum power point voltage is wasted with conventional PWM solar controls. The MPPT250
electronically converts this higher solar panel voltage into higher battery charge current. This is referred to as
boost current. Highest boost current occurs when the battery voltage is low and the solar panel is cold.
Advanced microprocessor control and high efficiency power converter circuitry combine to produce
the highest boost current possible over a wide range of conditions. Depending on conditions boost current
may be as high as 30%. Current boost in the 20% range is common.
SOLAR PANELS:
Ideally all of the solar panels in the system should be of the same type and
power rating. The MPPT250 works equally well with mixed solar panels. The microprocessor control
determines the operating point of the solar panels that produce the highest charge current to the battery. See
wiring diagram (last page) for solar panel wiring configurations. Maximum input power is 250 watts and
minimum recommended input is 68 watts.
SOLAR PANEL VOLTAGE:
The advanced microprocessor control of the MPPT250 allows a
higher input voltage from the solar panels to charge a 12 volt battery. In many installations higher boost
current over a greater operating range may be achieved by wiring the solar panels in series to produce a 24
volt PV input to the MPPT250.
100 volts maximum PV input voltage for model MPPT250HV.
Nominal
12 volt solar input performs very well too. See wiring diagram (last page) for solar panel wiring
configurations.
DO NOT EXCEED THE MAXIMUM SOLAR POWER OF 250 WATTS
MPPT250 WIRE CONNECTION ORDER:
Connect the MPPT250 wiring in the following order (failure
to follow exact order could result in damage to the control). If used ,connect the auxiliary battery charger and
low voltage disconnect circuits to the appropriate terminals on the MPPT250. Connect b and - to the
MPPT250. The LCD display and the yellow Low Voltage Disconnect led will turn on. Connect the solar
panel + and - to the MPPT250. In a few seconds the controller will turn on and begin charging the battery.
PV VOLTAGE 12 VOLTS UP TO 100 WATTS
BATTERY & PV FUSE RATING 10 AMPS
PV VOLTAGE 12 VOLTS 100 TO 250 WATTS
BATTERY & PV FUSE RATING 30 AMPS
PV VOLTAGE 24 VOLTS UP TO 150 WATTS
BATTERY FUSE 20 AMPS PV FUSE 10 AMPS
PV VOLTAGE 24 VOLTS UP TO 250 WATTS
BATTERY FUSE 30 AMPS PV FUSE 15 AMPS
