Consumer, Building and Occupational Services is not naming the companies but says they did not install solar panels "in line with Tasmania's regulatory requirements".

The investigation was launched after CBOS received a consumer complaint in December 19 relating to a recently completed solar installation.

CBOS subsequently uncovered a further 111 solar installations in the North, North-West and North-East of the state that required inspection. Of those installations, 88 were determined to have defects.

A CBOS spokesperson said that while the defects did not pose any immediate risks to consumers, they did require fixing so as to ensure "long-term safety and durability".

"To date, the regulator has issued a number of defect notices and rectification orders to the electrical contractors," the spokesperson said.

"These orders require the contractors to rectify the defects at their expense.

"CBOS regulatory activity is ongoing with regard to this matter."

A month after the initial consumer complaint was lodged, CBOS issued a public warning about solar installations, focusing on unlicensed work, as well as door-to-door sales. Consumers are encouraged to check that installers have the appropriate credentials before paying for their services.

Electrical work in Tasmania must be undertaken by licensed electricians, with regulatory approvals required within three days of the completion of work.

If you believe your solar panels may be defective, contact the company that installed them and attempt to resolve the issue. Failing that, you can con contact CBOS on 1300 654 499 to seek advice.