| Solid State Relays (Not really GMC) [message #303557] |
Wed, 13 July 2016 22:53  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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I need a tutorial on Solid State Relays (SSRs) Specifically the DC-DC type. I have a solar application where the controller I will be using is turning on a 12 VDC to 120 VAC inverter for 10 minutes at a time. It will be used 3 or 4 times per night. The input to the inverter will be around 15 amps at 12 VDC from the battery(s).
At all other times the input to the inverter will be shut down to conserve battery storage capacity. The controller running all of this draws around 50ma at 12 VDC off of the same 12 VDC source. The controller will run 24x7. The controller can supply ground to the SSR at a maximum of 50 ma. These SSR's appear to draw less than 10ma.
I have never used SSR's before and I am reading that the trigger voltage (effectively the coil on a regular relay) can not be fed off of the same power source as the contacts that are being switched.
Also because power consumption is a major concern, I am trying to understand the amount of heat buildup and electrical power loss through the SSR's. It appears to be a lot since they are required to have a heat sink.
Someone please direct me where to go look for this type of information.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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