QIKPACs are built to be stacked with all the internal protections built into the design. If you would like to stack more than 4, then please contact us to discuss to ensure this is done in the most efficient way possible. In theory, there is no limit to the number of QIKPAC that can be permanently connected together to make a large power store. However, if you are planning to charge batteries by removing them from the furniture (and charging elsewhere), we suggest no more than four are connected together, to ensure that whenever they are reconnected together they can control the “levelling” of charge, between themselves without causing the battery overload protection to activate.