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Old 03-30-2015, 06:07 AM   #31
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sassylass, why would one want a heat sink when the batteries are fully charged? i dont get that..

thanks
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Old 03-30-2015, 07:57 AM   #32
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In my case, the three stooges didn't install a charge controller. Excess charge would be 'wasted' or would boil out the batteries if not monitored closely. A better use for me would have been to heat my hot water. I was 100% off grid btw. I had a water tank that was heated by the wood stove in winter or a solar rooftop heater in summer with a switch to redirect water flow as necessary. Unfortunately, the three stooges didn't install a pump, so the rooftop hot water never cycled to the water tank to stay warm -unless I manually drained it first - because the tank was below the solar heater, and not arranged for convection(hot rises/cold sinks) I could have run-out the unheated water in the garden, but that much water ate up my filters. (I could write a book on 'don'ts') The HW worked if you used it directly from the solar collector, but hot water in the morning was not a possibility, it was more like lukewarm. My water source was gravity fed from a spring on the mountain behind the house btw and was triple filtered. Water pressure was 100% reliant on gravity-zero pumps in the system.
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Old 03-30-2015, 02:28 PM   #33
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Old 03-30-2015, 09:46 PM   #34
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Quote:
Originally Posted by charles_m View Post
As far as I know, because of the nominal voltage of cells in lead-acid batteries being 2V, there is no such thing as a 3V battery.
http://www.electriccarinternational....P-CT-200AH.pdf
read up on batteries and off grid equipment, my 2 cents
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Old 03-31-2015, 07:17 AM   #35
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Superdave- thanks for that share. Love those charts. I would love to see all battery types together on charts like those for easier comparison of qualities.
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Old 03-31-2015, 08:32 AM   #36
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Tesla just announced that they will be releasing a new product line very soon. Many think it will be a new battery.
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Old 03-31-2015, 09:11 AM   #37
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Thanks for the post, Dave, but that is not a lead-acid battery. What I meant in my original post was that a battery with lead-acid composition will only have voltages in multiples of 2 because 2v is the nominal voltage of an individual cell.
lithium and other battery chemistries have different nominal voltages per cell.
I should have been more specific when I said there was no such thing as a 3v battery. I wish I could afford lithium.
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Old 03-31-2015, 07:30 PM   #38
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just busting your chops charles. i got a dealer to order my batteries to save shipping and remember you need a core for each one you buy. when you pick them up there will be numbers stamped in the top of the batteries, try to get them all from the same batch. bring a tester to measure specific gravity. good luck
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