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Old 03-04-2013, 07:30 PM   #11
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Here is another site that discusses 12 volt batteries of all types

The 12volt Side of Life (Part 1)

Regards

Scott
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Old 03-04-2013, 07:30 PM   #12
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Thanks, Doug. Maybe they figured it didn't matter with such short pieces. I'm not home to post a photo of what we have.
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Old 03-04-2013, 07:35 PM   #13
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I plan to run the 2 guage into the electrical centre area and have a 3000 watt inverter so the big cables will handle that load better, may be a bit of over kill but better to be safe than sorry. But I will say that cable between the two batteries should be large to minimize any voltage drop between the two batteries as to not fool the voltage regulators in solar or smart chargers.
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Old 03-04-2013, 08:17 PM   #14
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I plan to run the 2 guage into the electrical centre area and have a 3000 watt inverter so the big cables will handle that load better, ..........

Dave

Just curious ........ what do you plan to run with 3000 watt inverter? And, is 2 gauge enough for it at full capacity (250 amps)?

Barry
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Old 03-04-2013, 08:33 PM   #15
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The wire that connects the two 6V batteries should be of the same gauge size that connects the batteries to the convertor.
With a 12V system, a #4/0 AWG wire with a 400A in line fuse is used to connect a 3000W invertor to the batteries. Are four 6V deep cycle batteries being used ?
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Old 03-04-2013, 09:01 PM   #16
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Dave

Just curious ........ what do you plan to run with 3000 watt inverter? And, is 2 gauge enough for it at full capacity (250 amps)?

Barry
Barry, the 3000W inverter is rated at 120V AC, thus a max 30A draw (or at least so I am thinking ). Though, I too am curious as to what might draw that much. The only things I bring that used 120V is a small kettle, and a small heater, but just use gas if not connected to the grid.

edit: Oh yeah, my laptop sometimes, but the 300W inverter handles that.
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Old 03-04-2013, 09:06 PM   #17
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Barry, the 3000W inverter is rated at 120V AC, thus a max 30A draw (or at least so I am thinking ). Though, I too am curious as to what might draw that much. The only things I bring that used 120V is a small kettle, and a small heater, but just use gas if not connected to the grid.

edit: Oh yeah, my laptop sometimes, but the 300W inverter handles that.
Jim

3000 watts divided by 12 volts = 250 amps on the 12 volt side and 3000 divided by 120 volts = 25 amps on the 120 volt side.

At least that's what I've been told!!

Barry
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Old 03-04-2013, 09:35 PM   #18
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Yup... If you plug 3000W of 120V AC appliances into your inverter, it will draw 250 amps at 12 volts from your battery and convert it into 25 amps at 120V. You need some serious wire on the 12V side.

(this is one of the reasons that Europe favours 240V mains -- more power with less amperage).
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Old 03-04-2013, 09:41 PM   #19
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These are ours. If we have to worry about it for solar, then I guess we'd better pay attention. I take it the gauge is on there in fine print somewhere.
Would a lightning strike or surge matter as far as the wire gauge needed? Of course, that's the kind of thing I expect the EMS to take care of.
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Old 03-04-2013, 09:49 PM   #20
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Jim

3000 watts divided by 12 volts = 250 amps on the 12 volt side and 3000 divided by 120 volts = 25 amps on the 120 volt side.

At least that's what I've been told!!

Barry
Yeah, that makes good sense, Barry. I was only looking at the user side of things.
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