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Gold Prospecting
Alluvial Gold Prospecting
DC voltage drop over long wires to bilge pump
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<blockquote data-quote="Meroo" data-source="post: 296586" data-attributes="member: 8832"><p>To answer the question you need to know firstly how much current your pump draws. Should say it on it if it's a watt value simply divide this by 12 to get your current example 100w light divided by 12v equals 8.3 something amps off the top of my head . If the pump draws more then what the cable is rated for then there's your problem. Most cable will have a rating on it when you buy it if you got the cable from the back of the shed then good luck unless u know what to look for lol. So if the cable is rated to the current then your easiest bet is to use an online cable selector to give you an idea of what to use. If you want to get adventurous and have a multimeter you could join the 8 m cable at one end then go the the other end and put ur multimeter on ohms. This reading will give you the resistance of your cable. Now you can use ohms law to work out how much voltage you are losing across your cable say your pump draws 10amps. Say for argument sake the resistance of the cable is 0.1 ohms. 10ampsx0.1ohms equals 1 volt. So if your voltage is 12v from your battery then at the end of your 8m run you ll have 12-1 equals 11volts. Your pump may need a minimum 11.5 volts to work efficiently</p></blockquote><p></p>
[QUOTE="Meroo, post: 296586, member: 8832"] To answer the question you need to know firstly how much current your pump draws. Should say it on it if it's a watt value simply divide this by 12 to get your current example 100w light divided by 12v equals 8.3 something amps off the top of my head . If the pump draws more then what the cable is rated for then there's your problem. Most cable will have a rating on it when you buy it if you got the cable from the back of the shed then good luck unless u know what to look for lol. So if the cable is rated to the current then your easiest bet is to use an online cable selector to give you an idea of what to use. If you want to get adventurous and have a multimeter you could join the 8 m cable at one end then go the the other end and put ur multimeter on ohms. This reading will give you the resistance of your cable. Now you can use ohms law to work out how much voltage you are losing across your cable say your pump draws 10amps. Say for argument sake the resistance of the cable is 0.1 ohms. 10ampsx0.1ohms equals 1 volt. So if your voltage is 12v from your battery then at the end of your 8m run you ll have 12-1 equals 11volts. Your pump may need a minimum 11.5 volts to work efficiently [/QUOTE]
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Gold Prospecting
Alluvial Gold Prospecting
DC voltage drop over long wires to bilge pump
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