Product Manual

The internal temperature is used to set the temperature compensated charge voltages. For this, the internal temperature when
the solar charger is "cold" is used. The solar charger is "cold" when there is only little current flowing into the battery. Be aware
that this is only an estimation of the ambient and the battery temperature. Should a more accurate battery temperate be needed,
consider using an external battery temperature sensor, see chapter External temperature and voltage sensor [7].
External temperature and voltage sensor [7]. The temperature compensation range is 6°C to 40°C (39°F to 104°F).
The internal temperature sensor is also used to determine if the solar charger is overheated.
3.9.2. External temperature and voltage sensor
The Smart Battery Sense is a wireless battery voltage and temperature sensor and can be used with the solar charger. It
measures the battery temperature and the battery voltage and sends this via Bluetooth to the solar charger.
The solar charger uses the Smart Battery Sense measurements for:
• Temperature compensated charging using the actual battery temperature, rather than the solar charger's internal temperature.
An accurate battery temperature measurement will improve charging efficiency and prolong the life of lead-acid batteries.
• Voltage compensation. The charge voltage is increased to compensate in case there is a voltage drop over the battery cables
during high current charging.
The solar charger communicates with the Smart Battery Sense via Bluetooth using a VE.Smart Network. For more detail on the
VE.Smart network see the VE.Smart Networking manual.
Alternatively, a VE.Smart Network that measures battery temperature and battery voltage, can also be set up between a solar
charger and a BMV-712 Smart or SmartShunt battery monitor that has been equipped with a Temperature sensor for BMV,
without the need for a Smart Battery Sense.
Note that a VE.Smart Network can only be set up if the solar charger is capable of Bluetooth communication,
has Bluetooth enabled or is equipped with a VE.Direct Bluetooth Smart dongle.
Example of a VE.Smart Network of a Smart Battery Sense and a solar charger
3.10. Voltage sensing
An optional Smart Battery Sense or battery monitor measures the battery terminal voltage and sends this via Bluetooth using the
VE.Smart [29] network to the solar charger. If the battery voltage is less than the solar charge voltage, the solar charger will
increase its charge voltage to compensate for voltage losses.
3.11. Remote on/off
The solar charger is equipped with a remote on/off terminal. The solar charger can be turned on or off remotely by connecting a
switch to this terminal or by presenting a high signal to the H terminal or a low signal to the L terminal. Alternatively this terminal
can be connected to an external control device, for example a lithium battery management system (BMS).
There a several ways to turn the solar charger on using the remote terminal(s):
• The L and H terminals are interconnected connected via a switch or relay.
MPPT solar charger manual
Page 7 Features