Federal Treasurer Scott Morrison has put noses out of joint in South Australia after likening the state's proposed giant battery to the Big Banana at Coffs Harbour.

In Adelaide where he had just delivered a speech attacking Labor's claims of growing social inequality, Mr Morrison called the battery the "Hollywood solution" and suggested Premier Jay Weatherill had been taken for a ride by billionaire and Tesla founder Elon Musk.

"It is so at the margin it barely is worthy of a mention," he said.

Tesla's Elon Musk and SA Premier Jay Weatherill announce the world's biggest lithium ion battery. AAP

"I mean, honestly, by all means have the world's biggest battery, have the world's biggest banana, have the world's biggest prawn like we have on the roadside around the country, but that is not solving the problem.

"That's just trying to say, 'bright shiny thing over here, don't look at the thing over there', that's an old trick from a politician."