OpenGarage › Forums › Comments, Suggestions, Requests › water tank level? › Reply To: water tank level? December 24, 2016 at 7:39 am #272 szormpasParticipant Hi, I mean the max voltage (AC or DC) and max current that I can directly switch on/off with the on-board relay. I made a diagram below: thanks This reply was modified 6 years, 3 months ago by szormpas. Attachments:You must be logged in to view attached files.