Is it possible to use a 12 V, 6 A car battery charger with nichrome or copper flat wire to cut 8 mm synthetic rope? If so, what spec (length, width, thickness, type) of nichrome flat wire could I use for this?
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1\$\begingroup\$ It depends on the charger. If it is a smart chager, it might detect that there is no battery. \$\endgroup\$– JustmeCommented Feb 1, 2023 at 6:48
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1\$\begingroup\$ Why flat wire ? \$\endgroup\$– Bruce AbbottCommented Feb 1, 2023 at 7:20
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\$\begingroup\$ For a dumb charger, sure. How much current can it supply? \$\endgroup\$– winnyCommented Feb 1, 2023 at 8:50
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\$\begingroup\$ Thanks, it is actually a 12v 6 amp charger as in pic attached. I used it keep a boat battery charged up but would like to reuse it as a heat cutter for boat rope. I also thought a flat wire would be best suited for cutting rope. I will measure output with a multimeter and then confirm. \$\endgroup\$– Stefano PietroiustiCommented Feb 6, 2023 at 8:07
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1 Answer
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At 12 V and 6 A, you need 2 ohm or higher. At 2 ohm, you are however putting 72 W into your wire, which is a lot so you may melt it if it's too short. Nichrome is 112 μΩcm. You need to calculate your diameter and length from that to and up with 2 ohm or higher and not melt it.
Have a look here: Can I using nichrome wire to light a candle electronicaly?
