Originally Posted by trekerboy
Can I somehow "regulate" a 24v battery bank to produce constant 12v
(while keeping the bank in a 24v configuration) even under load?
There are switching power supplies available that will do that, yes. Commercial products are sold for that for a couple of related applications. One us the use of 12 volt
accessories (such as car audio) with the 24 volt electrical systems used in some military surplus vehicles. There are similar applications in aviation, and in marine systems.
BACKGROUND: In in our renovated AS we have a 4x6v battery bank wired in series-parallel for 12v. I am finding that the components I have on the 12v system are too much of a draw. For example, with 3 Fantastic Ceiling Fans going at the same time (and maybe a few other things like LED lights) the 12v system is drawn down to the 10v range which triggers low-voltage alarms on the fridge, inverter and other devices. I would just ignore the low voltage alarms but the beeping drives me crazy and I can't turn it off!
That is because there is something wrong with your setup.
The battery bank itself, if sufficiently charged and working properly, should be able to deliver several hundred amps without dropping below 12v.
There are any number of possible causes. It isn't possible to diagnose them accurately or safely over the internet.
Is this a bad idea for some reason?
It's relatively easy for someone with an electrical engineering background to put together a device that will turn a 24 volt input into a 12 volt
output. It takes some work (and parts cost) to make a device that will do it efficiently across a wide range of power draws. In round numbers these devices end up being around 90% efficient in the real world. They are also expensive to build, with costs similar to a 120v inverter of similar watt capacity.
You still have the problem of charging the battery, of course, so you would have to replace your 12v converter-charger with a 24v one.
What you suggest is a bad idea because it will not solve your problem, unless by happy circumstance you end up replacing whatever component is failing. A 12v system that isn't working still won't work if it's reconfigured for 24 volts.