Hope I am not posting too much ... got a bug in me to study options, and wrote this:
On the other side of solo SSR vs solo Mechanical Relay considerations; I found this on eBay:
TE Connectivity Kilovac EV200AAANA Contactor 500A, 12~24VDC Coil. USA Shipper.
Open Box deal $80 ...
Check out the datasheet for specifics. Built-in coil economizer – only 1.7W hold power @ 12VDC and it limits back EMF to 0V.
www.ebay.com
I noticed the description says: Designed to be the smallest,lightest weight, lowest cost sealed contactor in the industry with its current rating (500+A carry, 2000Ainterrupt at 320VDC). * Built-in coil economizer - only 1.7W hold power @ 12VDC and it limits back EMF to 0V.
stocked from a liquidation. Some Mexico manufacture, some China, all are the same spec and part number.
Wow to TE Connectivity Kilovac's ... only 1.7W hold power @ 12VDC spec. ( sounds very good if confirmed
vs Info. from Criag's testing of 200 Amp SSR with 60 Amps at 24 volts / current draw from the control side at 12V was .1 amp so 1.2 watts
(Not much less than 1.7 Watt coil hold power of the TE-Connectivity-Kilovac. Plus the SSR had a Voltage drop at 60 amps across relay of .9V (Craig: seems way high to me but i do not know what to expect) battery was at 30.0v load side of SSR 29.1v
This ebay find does have me wondering about SSRs for high amp current applications. I ordered a few SSR to test out and likely use in lower amp application like making BMS cut off option at Solar DC volts In to all in one unit/ cut off by certain BMS battery fault trigger).
It Would Be nice to see a list of different SSR and mechanical relays next to the watts needed for ON switch, ... that usually stay triggered 24/7 until released by BMS registering a battery fault. Maybe solo mechanic relay is OK idea when one finds a dependable one with a Built-in coil economizer (wonder how economizer coil works, and what range of watt draws are out there ???
I see SSR testing looking for: Which SSRs use the least amount of dc trigger watts/ and can handle the high dc amps, with the least amount of heat and voltage drop ! Will Prowse: I still think a YouTube clip demonstrating a simple thermal disc control of a 2nd mechanic relay trigger after SRR ... would be good idea, including for sending a message to manufacturing process: The DIY Solar Community wants dependable high amp relays with the lowest possible control side current draws, and the least amount of voltage drops; for our solar systems. Plus: We can make our own until we see better choices, at good deal prices (or something like that !!!