During the construction process, you will receive a notice required by California state law that a "mechanic's lien" has been placed on your property. This is to secure the materials and construction costs so that the project can be completed. This is temporary and will be released at project completion. Just don't go refinancing your home mid-installation!
If you finance the solar panels, the lender who is servicing your loan may also place a lien. This is generally a "UCC-1" lien, again placed on the panels and equipment. The lien will be removed upon repayment of the loan, but if you need to have it removed temporarily before paying off the loan, you should contact the lender directly.