While evaluating EPCs, the top 5 characteristics you should be most focussed on are:

• Their corporate background and earlier work background; number of years they have been in this field
• Case studies of the projects they have implemented
• Team composition, and technical/engineering skills of the key professionals in their team and strategic partnerships for technology
• Their technology/module/inverter supply partners
• Financial strength of the EPC or the parent company to which the EPC belongs

You might want to check out these questions too

• What are the different kinds of solar EPCs? – Here
• What are the roles and responsibilities of a solar EPC? – Here
• How many EPCs are there in India? – Here
• Solar EPC in India – Roles, Value Chain, Companies, Cost – Here
• Solar EPC Contracts – Terms & Conditions, Formats – Here
• What is the need for choosing the right EPC? – Here
• What could be some of the consequences of going for a poor quality solar EPC? – Here
• Should I go for a small EPC or a large EPC? – Here