Yes they do. Solar Bonds are unsecured Solar City debt.
The prospectus https://solarbonds.solarcity.com/assets/bond_document/180/?f... lists the following risks (among others).
• your inability to initiate bankruptcy proceedings against SolarCity;
• the lack of certain “customary” investor protective covenants in the indenture;
• your inability to require us to repurchase the Solar Bonds upon a change of control of SolarCity;
• lack of cross-default provisions in the indenture with respect to our other debt; and
• the lack of an underwriter to conduct third party due diligence and other types of “gatekeeper” actions typically taken by an underwriter in an underwritten public offering.