I am building a power source for my astro-imaging gear using a 12V marine deep-cycle battery (120 amp-hours) stored in a battery box. The battery is supposed to power the telescope mount (requires 12V DC, 3.5A) and my laptop (requires 19V, 2.4A). Later, I might also add dew heaters for which I would use this controller.
I want to add three 12V cigarette lighter sockets and a fuse.
My main questions are:
- Where to add the fuse in the circuit and why?
- What rating should the fuse have?
- Should I also add a fuse in front of each cigarette lighter socket?
I read that the loads in a circuit will only take the amps the need.
- Can a marine deep-cycle battery also actually "push" current into my devices and blow them? Or are voltage fluctuations more of a problem?
For the laptop, I am planning on using a power inverter. I know it's not as efficient as a DC to DC power adapter but I think the battery has enough power to handle this inefficiency no problem and it's also more convenient in case I want to add a different laptop with different power supply specs.