def METHOD_NAME(
    self, powernode_machines, timeout=900, wait=True
):
    """
    Start PowerNode Machines
    Args:
        powernode_machines (list): List of PowerNode machines
        timeout (int): time in seconds to wait for node to reach 'not ready' state,
            and 'ready' state.
        wait (bool): Wait for PowerNodes to start - for future use
    """
    for pnode in powernode_machines:
        self.service.start(pnode, timeout)