- Jun 25, 2010
- Jun 25, 2010
OK, I misinterpreted that - sorry. But my offered solutions still apply and I'd like to know if there is anything about the solution that doesn't meet with your needs. If you want to deliberately complicate matters (install, design or build an interface that does 'whatever') then I'm sure we could come up with an Arduino and coding to drive a variable frequency AC source to control the motor... (tongue-in-cheek, don't get upset!) but what's wrong with the KISS approach?I just don't agree with the statement that I contradicted myself...
At 12V you won't need your inverter on, it won't take as much power from your batteries (no DC-AC-fan losses), it is easily controlled (DC speed controllers are 10-a-penny) and the versatility would - if you needed it - allow you to position multiple fans on the same controller at strategic locations that offered a better cooling solution.
As I previously said, if you are concerned for power wastage and 'distortion' then avoid the AC-controlling solution as there is no practical way to avoid all-of-the-previous.
There are many very efficient 12V fan units available - even from junk yards, maybe even an identical unit to one already fitted in your RV? If your RV has a distributed 12V supply (usual cigar-lighter socket arrangement) then powering one isn't going to be a cabling issue.
IMHO the key to any solution these days is (1) energy-saving and avoiding a conversion process is key to this as they rarely better 80-90% efficiency and (2) cost-reduction where 'used' or industry-standard devices are long term cost-savers. Nothing quite so effective as something the vehicle manufacturers trust to install in a machine expected to last 20 years.