I've read that 12V cut off switches should always be on the negative wire. The only explanation I've read that makes sense is that these switches usually stick out and provide a potential short if the chassis touches the switch, so if the switch is on the negative wire, this is less dangerous.
I'm currently building a small ungrounded solar system in a box. The box is plastic. The chassis grounds and unconnected. Is there any reason why I can't/shouldn't put the cut off switch on the positive wire? It would be more convenient there as I need to join the inverter and charge controller positive leads and the lugs on the switch would be useful for this. My shunt is on the negative cable, so I'm using those lugs already for the negative.
Thanks.
I'm currently building a small ungrounded solar system in a box. The box is plastic. The chassis grounds and unconnected. Is there any reason why I can't/shouldn't put the cut off switch on the positive wire? It would be more convenient there as I need to join the inverter and charge controller positive leads and the lugs on the switch would be useful for this. My shunt is on the negative cable, so I'm using those lugs already for the negative.
Thanks.
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