Since a couple years I've been messing around with a raspi and some motors. Building random stuff with dc-motors and such. I now want to power a self driving boat-robot with some solar power. For this I imagined using a solar panel, a charge controller and a li-ion battery. I chose li-ion because it's light-weight, but not as explosive and difficult to charge as lipo.
So I was thinking of ordering the following:
- A 3S 12V 3000mAh battery pack
- 2W 6V Solar Panel (3 of these)
- An MPPT Solar Panel 3S 5A Charger Controller
So I thought of connecting the 3 solar panels in series so that they make for 18V input to the charge controller (the input voltage is up to 28V). That can then be hooked up to the battery.
I have 2 questions about this:
1) Would this be a reasonable setup?
Furthermore, once I can charge the batteries I want to build this into my robot and simply connect the load (raspberry pi and some very small dc motors) to the battery connectors. That means the battery connectors are connected to both the charge controller and the load.
2) Would this work or am I thinking too simple?
After this I want to add a voltage sensor to the battery and read that out from the raspi, so that I can limit power usage when the battery power is going down too fast, or shut the whole thing down if the battery juice is critically low.