Example 12V Relay Schematic for LiFePO4 Solar Systems: Corrections to the video:
Comments below suggested the use of a "Flyback Diode". Very smart idea!! This is how they work:
More information:
I will update my schematic for this change.
Brian B put it nicely in a comment below: Great content! One way to stop shocking yourself and possibly damaging you BMS, put a large diode in the opposite direction across the coil. ie negative of the diode will go to the positive coil terminal and positive of the diode to negative terminal. This is called a 'fly back' diode.
And here is another super useful comment by foxabilo:(edited)
You can fit a simple diode (1N4001) pointing from the negative relay terminal to the positive relay terminal (diode band towards the positive), - ----≥|----- + which will stop the shocking voltage, you can also place a suitably rated capacitor across the terminals to further dampen down fast transient voltages. (ensure it's voltage rating is higher than the maximum voltage of your system)
And here is a non-sponsored link to this diode:
Further points:
-Be sure that your relay is a "continuous duty" current rating. The relay in the video is in fact a 500A continuous duty relay, that can handle 700A surge. Sometimes it will be labeled as a 500A relay, but it can only handle that current for a few seconds.
-Please use inverter relay control if it has it! Absolutely! That is the best way
-Also, some people asked about OCPD for inverter lines. Yes, you ALWAYS need an OCPD!! I like to slap together quick little tests to show a concept, but when designing your system, you need to fuse every line coming from your battery. I figured this was implied, but I had a few comments below thinking that you do not need OCPD. That would be crazy! I wouldn't sleep at night if there was a unfused live wire in my house attached to a battery.
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