03-19-2009, 11:21 AM | #21 | |
Stay thirsty my friends!
Join Date: Jan 2007
Location: Suburban Chicago
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Re: Charging Extreme DC
Quote:
Ohm's law applies to electrical circuits; it states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them. The mathematical equation that describes this relationship is: I = V/R where I is the current in amperes, V is the potential difference in volts,and R is a circuit parameter called the resistance (measured in ohms, also equivalent to volts per ampere). |
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03-19-2009, 12:22 PM | #22 |
Gone Wild
Join Date: Mar 2009
Location: Roseville, CA
Posts: 2,757
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Re: Charging Extreme DC
It's not you, it's me. Sorry for the confusion, I was mistaken when I termed it Ohm's Law and it really should have been Watt's Law.
Power dissipation can be determined by Watt's Law, which states: P = I x E P = Power (Watts DC) I = Current (Amps DC) E = Voltage (Volts DC) What I said above, change E=IxR to P=IxE and all will be the same as I originally stated: A 20 amp circuit on 120v will give you 120v(E)x20a(I)=2400w(P) If you are charging a 50v battery bank you only have a max of 2400w/50v=48amp A 20 amp circuit on 220v will give you 220v(E)x20a(I)=4400w(P) If you are charging a 50v battery bank you only have a max of 4400w/50v=88amp |
03-19-2009, 06:23 PM | #23 | |
Gone Wild
Join Date: Nov 2008
Posts: 240
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Re: Charging Extreme DC
Quote:
What the OP does not understand is Ohm's Law and that a welder no mattery what size maximum open circuit voltage is 40 VOLTS. OSHA and UL forbid any higher. In addition that is open circuit voltage with NO CURRENT and as soon as you draw current the voltage folds back, way back to a few volts. There is no way on GOD's green earth a welder will work. Using a 120 VAC dedicated circuit charging at 132 volts the maximum theorhetical charge current you can have is 1920 watts/132 volts x 90% Effeciency factor = 13-AMPS Sorry Doug but 13 AMPS is the absolutely best you can do using a 120 VAC 20-amp circuit to charge a 132 volt battery. You cannot violate the Law of Physics. |
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03-20-2009, 06:38 AM | #25 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,358
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Re: Charging Extreme DC
All of this discussion is still very confusing I wonder why we an expert hasn't jump in here and explain just how this can be done? I have 2 welders, a 175amp mig and a 240a/220v arch. Which one of these can I charge my batteries with?
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03-20-2009, 11:54 AM | #26 |
Stay thirsty my friends!
Join Date: Jan 2007
Location: Suburban Chicago
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Re: Charging Extreme DC
Good question scotty. There used to be a guy around here who could handle questions like this. It's almost as if he's invisible now?
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03-20-2009, 12:02 PM | #27 |
Gone Wild
Join Date: Mar 2009
Location: At the race track(Texas)
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Re: Charging Extreme DC
Okay, thanks to Roady insisting that I have to have voltage and amperage
to charge my batteries. I went back to Odyessy they agree. But failed to tell me, oops. Now this is what I need. 135 volts of DC output, 0 to 100 amp range, 110 or 220 I don"t know? Am I looking for anything else? Will I be able to find all of this in one welder? Thanks for your time. |
03-20-2009, 12:06 PM | #28 |
Gone Wild
Join Date: Mar 2009
Location: Roseville, CA
Posts: 2,757
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Re: Charging Extreme DC
What are the numbers on the UL rating plate for each welder. Should be a plate somewhere that says voltage, amperage, cycles etc on it. It should be pretty easy to figure out once those numbers are known. One of the numbers you're specifically looking for are amperage at 100% duty cycle.
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03-20-2009, 02:21 PM | #29 | |
Gone Wild
Join Date: Nov 2008
Posts: 240
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Re: Charging Extreme DC
Quote:
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03-20-2009, 02:39 PM | #30 | |
Gone Wild
Join Date: Nov 2008
Posts: 240
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Re: Charging Extreme DC
Quote:
To answer your question if you use a 120 VAC 20-amp dedicated circuit, the highest charge current you can get at 135 volts DC is: Charge current = [(120 VAC x 20 amps x 80% duty cycle) / 135 volts] x 90% efficiency factor = 13 AMPS. Same answer as last time you asked. To figure out other combinations use the same formula. For example lets say you have a NEMA 7-30 receptacle, the same kind you would use for a electric dryer is 240 volts @ 30 amps, then: [(240 VAC x 30 amps x 80% duty cycle) / 135 volts DC] x 90% efficiency factor = 48 AMPS [ (VAC x Amps x .8 ) / DC Volts ] x .9 = Maximum charge current at DC Volts. You will have to find a battery charger made for your application. There is no way around it. Cough up the bucks! |
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