So there will be a relay in between the DC-DCs and the 12 V Battery. The relay will turn on when the high voltage system is energised.
The two purple wires go to the coil.
I will try to get it mounted and partially wired tonight.
Thursday, May 5, 2011
DC-DC Relay
As mentioned many posts ago in this blog, I have two Switch Mode Power Supplies (DC-DC converters) that will supply up to 40 Amps for the 12 V systems in the car. I do not want to connect them directly to the little 9 AH, 12 V battery because if the car is left idle for some time the DC-DCs will drain the 12 V battery.
So there will be a relay in between the DC-DCs and the 12 V Battery. The relay will turn on when the high voltage system is energised.
A Tyco 150 A relay seems to be a good overkill. Seriously - I had it - and it gives me some convenient 6 mm terminal posts to connect things to. The coil doesn't draw any more current than one of those automotive Narva (or similar) 70 A relays.
The two purple wires go to the coil.
I will try to get it mounted and partially wired tonight.
So there will be a relay in between the DC-DCs and the 12 V Battery. The relay will turn on when the high voltage system is energised.
The two purple wires go to the coil.
I will try to get it mounted and partially wired tonight.
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