I am upgrading to a new outdoor brew system, current intial setup is two 65k btu burners in order to brew 10 and/or 15 gallon batches using a 20 gallon aluminum kettle.... 2 questions... 1) Who is using 65k burners? If yes, pease chime in. 2) Do you know how long it will take a 15 gallon volume to boil on a 65k btu burner? 3) Do you know how long it will take a 10 gallon volume to boil on a 65k btu burner? Below is a link to a sample of the base of the brew system... http://www.academy.com/shop/pdp/out...cart/pid-27751?N=578846088&Ntt=bruner&Ntk=All
I have boiled 15 gallons of wort at once. It took a long time to get to a boil. It was also awfully heavy. That base indicates it is rated for 37.47 pounds. You want to be very careful with that amount of boiling liquid when it is significantly higher than the ground. I realize this answers neither of your questions, but I thought it worthy of mention. I would hate for somebody to get hurt.
Indeed! The 18 gal of water you would likely be boiling to brew a 15 gal batch will weigh in at about 144 lbs. Add the weight of the kettle and you've exceeded the cart's rated capacity by over 400%. Even a 5 gal batch will weigh more than this cart's capacity. Have you thought this through?
Split batches it is I always recommend practice runs with water. It's cheaper and less likely to burn you than 150F wort.