We charge the cap up to 12V, 'hit' one solenoid, then charge the cap back up to 12V, then 'hit' the other solenoid......
...we can't have the SEPIC charger running while the solenoid coils are actually  being actuated.the SEPIC charger will be heavily current limited anyway, since we can't draw too much power from the 5V rail of ball valve, so it probably won't make much difference if we leave the SEPIC running during the actuation anyhow.
-The fact is, we are slotting these latchign solenoids into an existing product which has a 5V buck converter in it.....we don't want to have to adjust that to make it able to supply higher power....so we are going to be making the SEPIC charge the cap very slowly....in about 480ms.

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