iceisfun said:Is anyone switching battery banks with DC SSRs?
If so which SSRs are you using?
The same goes for mosfets if you know of a good one that will get the job done
KtB said:Would a contactor not do the same job with far less current loss and heat ?
karrak said:I bought one of these and ran some tests on it.
It had an On resistance of ~2mOhm (0.002Ohm). Without a heatsink it ran warm to touch with a current of 88A, around 110A would be the absolute maximum without a heatsink. You can get a 400A version of this SSR which should have a resistance ~0.5mOhm. I also checked the voltage rating by placing 60.8V across the switch when switched off for several days.
Simon
iceisfun said:I have contactors on the way, the possibility of a mechanical failure leaving the circuit closed (worst case) is what drove me away from that idea initially, its possible for a fet to fail anyway.
Just testing with a multimeter using the 'diode tester' tells me that it will not stop reverse flow. The reason and solution is in the following diagram from this articleCould you perhaps do a test to see if hooking up the load side backwards it stops reverse flow? If you have a current limiting power supply neg to pos and pos to neg on the load side and see if it pulls it down or acts "open"?