This document aims to serve as a resource for off-grid solar (OGS) companies, microfinance institutions (MFIs), and local banks (hereafter referred to together as MFIs) on providing loans for off-grid solar products in sub-Saharan Africa. The market for off-grid solar technology in this region is growing rapidly, and OGS companies and MFIs are naturally suited to helping each other enter and grow in this market. Moreover, by partnering to design and market loans for off-grid solar products, OGS companies and MFIs can help to increase access to energy, particularly for rural, low-income households, farmers, and small businesses. This document offers lessons learned from partnerships between MFIs and OGS companies, advice on gender and social inclusion, and information about piloting and scaling solar loans.