>>/polru/665836@456257
>> The operation is not instantaneous, because the battery current is enough to latch on.
And from 12 V battery long if the wires are several meters.
As an option of pumping the capacitor from the converter and either closing the actuator or the option with a dinister or thyristor and a neon bulb when it gains charge.
In the cold, a lot of electronics working normally at home do not work or work but not so. Lithium batteries and batteries do not give a good current in the cold. lead batteries work to minus 40 or more if the density is increased to 1.30 or even to 1.32.