Tigo Energy, a US-based developer of technology to increase efficiency of commercial and residential solar installations, has raised $10m from two strategic investors and three independent venture capital firms. Taiwan-based mobile device maker Inventec Appliances Corporation led the series C round as a new investor, and was joined by Tigo’s previous investors. These were Israel-based technology company Clal Industries and Investments’s Clal Energy subsidiary, as well as VCs Matrix Partners, OVP Venture Partners and Israel Cleantech Ventures. The company previously raised $10m in its series B round in May last year and $6m the year before that.