High Efficiency, silent DC-DC converters to switch between 12, 24, and 48 volt systems. All units can be used in parallel if you need more power than a single unit can provide and adds system redundancy. These devices are also referred to as buck / boost converters, switching power supplies, and dc-dc chargers. This page does not list MPPT charge controllers. If your intention is to charge a battery from solar power input, you should select an appropriate MPPT Charger instead. Begin by choosing how many volts you need to convert from and to. Then select the maximum power output of the unit. If you know your equipment's watts, you can divide it by the voltage it runs at to determine how many amps it will draw. The output voltage is fixed on some models, and variable on others. Variable output units have either a set-screw or bluetooth to adjust the output voltage. Our converters can be used up to 100% of their rated output amps. The input is less if down-converting and more if up-converting. So it is important to size your power cables properly. It is still a wise idea to keep your constant loads at under 50% of the transformer's rated power to reduce heat and maximize equipment life. Take the watts your machinery consumes, and divide them by the voltage, to get the amps output you need. If you need more amps than the unit provides, you can use two or more of the same model in parallel, as long as it is the same model, with the same settings configured. Below are some additional considerations when choosing the best DC-DC Converter: Isolated vs. Non-Isolated converters: For most uses, you get the best price and efficiency with non-isolated converters. They share a common negative. They may have 4 or 3 connectors. For models with three binding posts, such as the Victron Orion-TR series, you connect the negative of both your 24V and 48V systems to the same post, and you get a secondary positive with your other voltage of choice. In comparison, an isolated converter creates a new circuit. Its output positive and output negative are not a part of the same circuit as the input. It is better suited for powering sensitive electronics and it is safer when stepping down from higher voltages because you get less points of contact to accidentally complete a circuit with. You can always use an isolated transformer instead of a non-isolated unit, but they are more expensive and ironically slightly less efficient. Victron brand isolated converters are for example used for telecom and other critical DC equipment.