Hello,
I have experience with embedded systems, Linux, C/C++, microcontroller and electronics hardware. I have a Raspberry Pi2 for this project in addition, I am currently working on a power distribution unit so I am very close to your needs. As far as, I understand that you want to monitor DC voltage from solar panel and may be batteries that are charged from panels.
I am looking forward to a reply from you. Thanks for reading my proposal.
Best regards,
Cumali Ceylan