Mobile Bar – low power useage


We are currently planning the fit out of a double decker bus as a mobile bar and venue
We will offer one beer one lager from Kegs. 

We want to keep the power consumption to a minimum as we will be running off solar battery storage with generator back up. I understand the big drain is on starting up cooling systems / refrigeration?
Can you give us any advice? Point us in the right direction of equipment / suppliers?

Would you be able to assist us? 

Do you have a better answer? Leave a reply or an opinion