I have a related question that I have been meaning to write about:
I have a box of new Crydom (CSD2450) SSR's that I bought on eBay. The input
is 3.5-15VDC and the switched output is 240 VAC @ 50A.
I had planned on using them in my conversion for switching low power DC
circuits, such as horns, lights, radio's, etc. The problem, I have
discovered, is that AC switching loads will not work on DC. (I'm sure most
people on this board already that ... And are chuckling at my ignorance!)
Through experimentation, using a 12-v headlight, I find that the relay will
switch the light ON, but when the input is removed ... The light stays ON.
So much for that idea!
The purpose of this message is to see if there is some "trick" that I can
use to shut the SSR down, when switching 12-VDC loads ... Or should I start
looking for different SSR's?
You can get solid state relays from www.allelectrolnics.com for less than
$10.00 that may work for you. Yes, the ITE solid state relays I have been
running for 22 years every day cost me about $80.00 for a 40 amp at 100 VDC
back in 1985.
----- Original Message -----
From: "Al" <[email protected]
To: <[email protected]
Sent: Sunday, July 29, 2007 10:39 PM
Subject: solid state relays
> I am considering using solid state relays in a battery balancer system.
> DC models seem to be very expensive. I wonder why? Don't they consist of
> just a pair of high power mosfets and an optoisolator/driver?
> Could I build my own?