Costruire Siti Web

I manage a community center, we have photovoltaic panels, and it is my interest to empower the use of electric current in the community. So i need a web page, and internal web page, using php mysql and ajax where people can put on checkbox of items they use. It's important that others people can see that use, so i guess a db is needed to store what is on and what is off, and they can decide to use something later. We have a three-phase system, so the system could me permit to insert items in that db, with phase field, and then to sum items on phase by phase and to show the resault. eg. Lights on phase S 500watt, oven 1100 watt on phase t, etc sum on phase T = xxx , sum on phase S = xxxxx i want to turn off the oven... so T = xxx-1100 etc