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07/07/2007, 07:29 AM
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#1 |
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Registered Member
Join Date: Nov 2006
Location: NJ.
Posts: 555
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800 Watt Invertor
Hello O Agios.
I would like to install an 800 watt invertor (12v DC~AC) as a back up for my pumps. Both pump's draw less than 2 amps together. I need to place the unit about 20 ft. away from the power source, can I use 12 / 2 romex for the run from the 12v dc car battery, or what do you recomend. Also, should I gnd. the invertor base to the AC pannel gnd. As Always Thanks For A Reply  Steve 926 
__________________
Experience is something you don't get, until just after you need it . Current Tank Info: Small in nature (50gal. Reef) Large in Heart. Re-occurring dream of a 300 gal. |
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07/07/2007, 09:16 AM
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#2 |
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Moved On
Join Date: Feb 2007
Location: Miami Florida.
Posts: 3,842
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Let me do the calculations using Ohms Law and suggest to you to run the high voltage 20ft if you can instead of the 12 volts. Ok here we go 2Amps * 120 volts = 240 watts. Convert to 12 volts --- 240 watts / 12 = 20 Amps. A#12 gage wire can carry the voltage but I am suggesting A # 10 gage to compensate for the distance. If we calculate for 800 watts then 800w/12v= 66.66 amps You would need a very large cable , minimum # 4 gage. If you want to run this #4 go to an auto parts store they sell cables even thicker than that that are multi strand, like welding cables or if you want the cheapest way out go to home depot and just use regular # 4 THHN cable. Hope this helps.
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07/07/2007, 09:24 AM
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#3 |
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Moved On
Join Date: Feb 2007
Location: Miami Florida.
Posts: 3,842
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The way I would do it Is install the inverter next to the car and run any extension cord to the pumps
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