Ok so I have been looking at ways to put a project I built last year back into operation with some enhanced performance. I built a 24/7 CCTV recorder using the raspicam project as my base, run from a large leisure battery with 17.5w of solar panel, you'd imagine it would run lovely. Not when your in the UK where theres a maximum of 8 hours a day light let alone sun in the winter. Once we had enough sun for my system to run for almost 2 weeks without the need for a battery change, but on average about 6 days was the most you could get. It would record 24 hours a day to the SD card, which made them last about 3 months with the fact the pi would just suddenly lose power.
Having seen alot of development in recent times for better power management (just moving from an A to an A+ would make a difference) I was looking to re-implement my project with a few changes, one of which being my power source. I have started harvesting lithium laptop cells, which will obviously give better performance than regular cells and was looking to build some sort of mega pack, with a phone these things will last a day maybe 2 or 3 on Standby, so I was thinking with several cells, a solar panel and some sort of time activated stuff I could maybe make the system 100% better.
I came across PiJuice while looking through search results on batteries and it seems to be the type thing I want, but I want something with slightly more capacity. What I havent really managed to find anywhere though is a DIY version? I have an RTC time clock, lithium chargers and stuff and a massive supply of cells I wanted to see if anyone had the DIY equivalent of a PiJuice to give me some base ideas.
The plan is to have the Pi and its battery pack about 10 feet apart as space is limited for the pi cam in its housing, but I can have a separate battery bank elsewhere.
Suggestions and ideas?