I have the following components:
- 1W Solar Cell (5V at 200mA): http://www.ebay.ca/itm/291435192356
- DC-DC Converter (2.5V Vin_min, set to 5V Vout): http://www.ebay.ca/itm/200983543561
- 5V Lithium Ion Charger (with protection): http://www.ebay.ca/itm/400665520672
I'm thinking of connecting them like this: Solar Cell -> Converter -> Charger -> Li-Ion Battery. The reason being is that the converter will keep a constant 5V into the charger, which will charge the battery. My questions:
- Why can't I remove the converter if I'm willing to accept inconsistent charging? It will also avoid any power usage that existed across the converter.
- If I take another solar cell and connect in parallel to the first, will I get 5V, 400mA?
[EDIT] My constraints:
- Using it indoors, will get some sunlight, varies between 3-5V (maybe more on a really sunny day), but a lot of the time will be crappy fluorescent light.
- Will trade consistency with efficiency i.e. It doesn't have to be on all the time, but when it's on, I'd like it to power the charging module properly, and charge the li-ion battery.
- The converter seems to boost to 5V for inputs less than 5V, but if input is over 5V, then output of converter will NOT clamp to 5V and actually rise with input.