Softwired (when you want to plug it into a wall socket) For GPOs, the maximum we recommend is 10 ports per wall socket. This ensures that risk of overloading the circuit is minimal. However, it depends on what your users are charging. 10 kettles drain far more power than 10 laptops. For USB, we can comfortably connect up to 30 compartments to a single power point. Hardwired Hardwiring can increase the amount of ports per wall connection. However, a licensed electrician is required for installation.