Capacity of this box is about 250 bats. If more capacity is needed, additional boxes can be placed side by side. New nests can be knocked out in May or early June, during cold mornings or evenings, when wasps are less aggressive. If bats are present, don't disturb. Bats and wasps can coexists in boxes.
Bats provide travel lanes for wasps to reach their nests.
Wasps, in turn, provide some protection against box disturbance.