Victron Orion 24/12V 70A DC to DC Converter Non Isolated, High Power Cheaper

Victron Orion 24/12V 70A DC to DC Converter Non Isolated, High Power, 5 Year Warranty. 

Remote on-off connector:
The remote on-off eliminates the need for a high current switch in the input wiring. The remote on-off can be operated with a low power switch or by the engine run/stop switch (see manual). 

All models with adjustable output can also be used as a battery charger:
For example to charge a 12 Volt starter or accessory battery in an otherwise 24V system. 

All models with adjustable output can be paralleled to increase output current:
Up to five units can be connected in parallel.