Victron Energy SolidSwitch 104 will switch DC loads of up to 70V/4A and can be controlled by a low power digital signal
It controls an external alternator regulator, in a Victron Energy lithium system
Switch a DC load, such as a light. A low power control circuit, max current drawn will only be 0.1 mA, can then control a load of up to 4 AMPs
Increase the number of chargers that can be wired to the ATC (allow-to-charge) output of a Victron Energy BMS
The feature making it such a usable switch is its low current draw. The SolidSwitch will draw 0.04 Ah a month, while a small relay can easily take 10 Ah a month