I would like to hook up a computer to a 12V battery, and I need a clean 12V input to the computer because only buck regulators will be used to deliver the outputs to the computer, no sinusoidal waves.
The fly in the ointment is that the battery(ies) need to be constantly charged. If I charge them using a typical high power multi-stage charger (sometimes called "smart" chargers), will the charger pollute the DC output from the battery(ies) with sinusoidal waves that would be bad for the computer?
If indeed the charger will pollute the output of the battery(ies) if it is directly connected to them, I can see two possible solutions to this problem. One would be to install some GIGANTIC capacitors between the battery(ies) and the charger to rectify the charging input to the batteries. The other would be to use relays and a double stack of batteries. In other words, I would have not one, but two power reservoirs. The computer(s) would run off of one of the reservoirs, while the other was being charged. Then it would reverse. The computers would switch to the second reservoir and the charger would simultaneously switch to the first reservoir. Would either of these strategies work?