I am sorry if this question has been asked before, I couldn't find exactly what I'm looking for.
TL, DR: I'm looking for a way to boost 3V to 20V that:
- Works from a single cell lithium ion battery
- Is lightweight (UAV application)
- Can power a 45W load at 20V
- Is not super expensive
- Doesn't require buying additional batteries
- Doesn't consume power directly from the drone's flight battery
The long explanation: I have a specific piece of equipment that needs to be carried on a drone and is powered by 20V at something like 2.2A. I couldn't figure out a way to achieve that without a boost converter or a 6 cell lithium battery. The thing is, I have a lot of 6 cell, 5000mAh LiPo battery packs laying around, but they are prohibitively heavy (around 900g) and since each flight only lasts for around 10 minutes, I don't need that much energy storage. So, I thought it would be a good idea to disassemble the packs and use a single cell for each flight, which would give me 3.7V, 5000mAh while only weighing 1/6 of the whole pack. Then I bought a cheap 3-35V 80W boost converter, only to find out that it could deliver a maximum of 7W in this scenario, turns out the "80W" rating is assuming an input voltage of 20V and an output of 24V, which is not what I want. I have considered buying smaller lithium cells and building my own 6 cell pack, but that would get expensive really fast, and would also mean I can't use the batteries I already have. So, I would like to ask if there is another way to accomplish what I trying to, given all those restrictions.