Informatie over dc-dc converters
What does a DC-DC charger do?
A DC-DC charger – also known as a B2B (Battery to Battery) charger – charges your house battery from the starter battery while the engine is running. It actively draws power from the starter battery and converts it to the correct charging voltage for your house battery. Importantly, the DC-DC charger electrically disconnects the starter battery from the house battery. This prevents the house battery from draining the starter battery – so you can always start your vehicle.
Why not just a relay?
A simple relay connects the starter and house batteries as soon as the alternator supplies voltage. For an older van with a conventional alternator and a regular AGM house battery, this may suffice. In all other cases, a DC-DC charger is the right choice. For modern vehicles (Euro 5 and 6), a DC-DC charger is necessary – the smart alternator actively lowers the charging voltage once the starter battery is full, rendering a relay ineffective. The same applies to a lithium house battery, regardless of the year of manufacture: lithium requires a controlled charging profile that a relay cannot provide, and a relay cannot limit the inrush current to a lithium battery.
Isolated – what does that mean?
The Orion-Tr Smart is an isolated DC-DC charger. There is galvanic isolation between the input (starter battery) and the output (house battery). The two battery circuits are completely electrically separated. This is important when the house battery's ground is not connected to the chassis – which is common in lithium installations and on boats.
The right charging profile for every battery type
The Orion-Tr Smart has adjustable charging profiles for both AGM and lithium (LiFePO4). While lithium batteries with a built-in BMS can handle a wider range of charging voltages, this does not mean that every charging profile is optimal. A correctly set charging profile ensures a full and efficient charge, a longer lifespan, and less wear on the cells. You can easily set the profile on your phone via the VictronConnect app.