Since I started using dry cabinet 4 years ago, I don't have any need for silica gel. Unless I am travelling overseas.... Singapore's power supply is pretty reliable. The only time I had a power trip was when i went overseas, and I had all my gear with me.
Anyway, The dry cabinet is meant to keep the humidity at the suitable level, so having silica gel inside will not really help and may even tamper with the level.
ya dehumidifier, once it hits the desired humidity, often switches itself off anyway wat.... so wats the difference....its only when there's a sudden change in humidity then it will start to work again...
so yup its true...keeping the door closed will do...if its juz for a short time of say a few days ahahha