Hello,

What would you recommend I use for a timer and relay for the attached circuit? The timer will need to use 110VAC and switch every 15 min. The AC and DC circuits need to be isolated.

Thanks in advance!!

TY,
WTL75

 

There is probably a less expensive way to do what your want, but here is good place to start: http://relays.tycoelectronics.com/pnb.asp

 

I'm curious as to what you're trying to do with that circuit?

I see you're switching between the + and - of the battery bank, but there is no path for return current.

How come you have five pairs of batteries in parallel? Do you really need that much current?

 

Nice topic title! -.-

 

For the timer, you can configure an LM555 as an astable multivibrator with 30 minute period and 50% duty cycle: http://www.uoguelph.ca/~antoon/gadgets/555/555.html

For the relay and the relay driver, answer will depend on how much current your load draws.