10
Selecting the type of rechargeable battery and system voltage
The MPPT
plus
+
is suitable for charging lead
(open, Gel, AGM)
and LiFeP04 batteries.
The respective type of rechargeable battery is selected before the start-up via the DIP switch (5/6) on the back of the device.
DIP switch 5
DIP switch 6
Type of rechargeable battery
OFF
OFF
Lead 12 V
ON
OFF
Lead 24 V
OFF
ON
AGM battery
ON
ON
LiFePO4
The respective system voltage (12/24 V) is always detected automatically. There is, however, the option of determining the
system voltage manually for lead batteries. For this purpose, the required system voltage must be specified via the DIP switches
(lead 12 V and lead 24 V).
If the
"Manual battery selection"
button is pressed and held when applying the battery voltage, the
reset system voltage is applied, regardless of the actual battery voltage. This can be useful, for example, if 24 V batteries are
deeply discharged.
Charging behaviour
The batteries are charged in several stages depending on the set type of rechargeable battery. It can be set via the DIP switch
on the back of the device
(see point: "Selection of the type of rechargeable battery").
The following table gives information on
each charging stage.
Lead battery 12 V
Lead battery 24 V
AGM battery
( 12 V / 24 V)
LiFePO4 battery
( 12 V / 24 V)
Charging stage 1:
- Charging end voltage
- Duration
14.1 V
5 minutes
28.2 V
5 minutes
14.7 V / 29.4 V
5 minutes
14.6 V / 29.2 V
45 minutes
Charging stage 2:
- Charging end voltage
- Duration
13.8 V
unlimited
27.6 V
unlimited
13.8 V / 27.6 V
unlimited
14.1 V / 28.2 V
90 minutes
Charging stage 3:
- Charging end voltage
- Duration
not
available
not
available
not
available
13.8 V / 27.6 V
unlimited
The charging end voltage for lead batteries can be individually defined for the charging stage 1 via remote control or webbox.
The temperature is compensated
(with connected temperature sensor)
both in charging stage 1 and 2. In addition to this, an
equalizing charge can be set for this type of rechargeable battery by setting the DIP switch 7 to "ON" before start-up. The
duration of charging stage 1 will then be increased to 60 minutes. If the charge profile for LiFePO4 is selected, the setting
options for the charging end voltage, equalizing charge and temperature compensation are not available. However, four-cell and
also eight-cell LiFePO4 batteries can be used. The detection of the single or double system voltage and the resulting charging
behaviour is adjusted automatically.
Equalizing charge
This function sets the duration of charging stage 1 from 5 minutes to 60 minutes. So it is possible to remove sulphate layers in
the battery. This function should be used occasionally to extend the life time of the battery.
Assembly
In order to guarantee appropriate operation, please read these operating instructions including safety information completely
and carefully before use.
•
During assembly, ensure that the solar controller and any other system components are mounted in such a way that
they are not accessible to children. Danger to life!
•
Do not mount the MPPT
plus
+
solar controller directly above a heat source! Ensure that the battery is located in a well
ventilated room! Strictly ensure correct polarity!
•
Always ensure proper ventilation of your solar controller. Never cover the ventilation slots of the solar controller. Never
use the device in the vicinity of highly flammable materials.
•
Remember that large amounts of energy are stored in batteries. In case of short-circuit, these energy quantities can
be released in a short time. This means that extreme heat may build up or a fire may break out at the site of short-
circuit.
Connecting the solar controller
All components (solar module, battery, consumers and MPPT
plus
+
solar controller) must match each other in terms of voltage
and intensity of current. Check this information on the respective type plate. In case of doubt, please contact your dealer.
Strictly ensure correct polarity!
Note: In case of reverse polarity on the load output, devices without own protection may be destroyed.
This is why each consumer must be protected individually.
To ensure safe operation, please strictly pay attention that you observe the correct order when connecting the individual system
components.
1. Connecting the battery:
Having set the correct type of battery via the DIP switch, connect the battery with the MPPT
plus
+
solar controller by
using the screw-type terminals intended for this purpose. Make sure you use a suitable cable cross section to keep
the voltage drop and heating of the cables as low as possible. The screw-type terminals are intended for cable cross
sections of up to 16mm².
