The world's biggest producer of household batteries and solar energy systems will set up an assembly production centre in Adelaide.

Germany company sonnen will also move its Australian headquarters from Sydney to Adelaide.

The company will assemble 50,000 household batteries in Adelaide over the next five years, creating 130 jobs to begin with, increasing to 190 by the end of its fifth year.

The Labor Government said a further 300 jobs could be created by installing the battery systems within six months of the centre opening.

Sonnen has the world's biggest virtual plant in Germany and plans to offer similar services to Australian customers.

The South Australian Government has not pledged any funds to the company, but will help sonnen find a suitable location.

The company has so far scoped out the former Holden site, the Mitsubishi site at Tonsley and a site at Port Adelaide.

Premier Jay Weatherill said the local manufacturer would also be well placed to benefit from Labor's election pledge to provide $100 million in no-interest loans for households to purchase batteries and solar.

Labor 'playing catch-up' with solar loans announcement

The Labor Party this morning made the pledge to provide the interest-free loans for private homes — a policy similar to one announced by the Liberals in October.

If re-elected, Labor will offer more than 10,000 homeowners access to loans of up to $10,000 to install panels, batteries, or both.

The loans would be interest-free for the first seven years.

Mr Weatherill said the interest-free loans initiative would see power bills drop.

"It's going to slash bills, we've already seen that with our virtual power station, modelling demonstrates a 30 per cent reduction in energy power," he said.

"We've seen from the national regulator that renewable energy projects are projected to reduce energy bills by $300 over the next two years, so it's just beginning to happen."

But Opposition Leader Steven Marshall said the Labor Party was just playing catch-up.

In October, the Opposition released its own energy policy including a $100 million scheme that would provide grants of about $2,500 per household across 40,000 dwellings.

"The reality is 10,000 is not going to shift the dial in South Australia in terms of prices, unlike the Liberal Party which has put our policy up for independent scrutiny and we know that prices will come down under the Liberal Party's energy policy," Mr Marshall said.

"We've put our plan out for independent evaluation.

"Labor still hasn't provided any indication whether this is going to bring down energy prices in South Australia for any more than just the 10,000 people it's talking about."

But some doubt has been cast on the Liberal Party's energy plan costings, with the Opposition Leader first saying it would save households $300, and later admitting the figure was closer to $60 or $70.