|MadSci Network: Engineering|
I am trying to drive a solenoid (13.8V dc 20W). I have a 'timer' (not sure how it works, but it does) which requires a constant 13.8V to give me the time i require. I have built a variable regulator to give me this voltage (about 19V in-certainly more than 16V-up to 24). I am told that a most normal batteries wont be able to supply a load of 2A. Is this true? My conclusion to get around this is to 'buffer' some energy in a capacitor, so the battery only has to charge the capacitor, and the capacitor can supply the peak energy flow. I only have to draw this energy 20-30 times in a day (not every day either), certainly no more than 60 times, so 2A by 6 seconds gives 200mAH? and i am thinking of using 1000+mAH remote control car battery packs- 2 lots of prepacked 8x1.2V cells. (or any other ideas) and charge them using a charger of course (electronics is not my forte-Molecular Biology is) So can capacitors do this? and i can get away with cheaper NiMH or NiCad batteries (even it it is up to about 1kg of batteries) or do i *need* to purchase a very heavy (id guess >3kg) (and expensive) sealed lead acid battery and draw the current directly. Or am i just wasting my time and i should be tethered to the mains power while im standing in puddles in the glasshouse?
Re: How large/what capacitor(s) do i need do supply 2A 19.2V for 0.1 sec
Try the links in the MadSci Library for more information on Engineering.