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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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09-02-2021, 05:44 PM | #11 |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,947
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Re: Almost burned my cart and garage down last night
36v, or even 48v cannot produce the amps through the human body to kill you. The voltage is not high enough. Yes, you can be burnt by those amps flowing through a conductor that is burning up, but you cannot be electrocuted.
You can touch the positive terminal with one hand and the negative terminal with the other on a 36v or 48v battery and you will be fine, now try doing that with 110vac, or heaven forbid, 220vac! (No, please don’t do it, take my word for it.) Cheers Pat. |
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09-03-2021, 07:01 AM | #12 | |
Gone Wild
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 6,215
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Re: Almost burned my cart and garage down last night
Quote:
Respect the power of that pack. |
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09-03-2021, 07:58 AM | #13 | |
Gone Wild
Join Date: Jan 2013
Location: Saint Petersburg, FL
Posts: 2,089
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Re: Almost burned my cart and garage down last night
Quote:
110V*15A = 1650 watts. 400A * 36V = 14,400 watts. 400A * 48V = 19,200 watts... I have no idea what voltage or amperage it'd take to kill someone, but I can tell you I don't want to "be the conductor" for anything over 1650 watts! |
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09-03-2021, 12:00 PM | #14 |
Gone Wild
Join Date: Nov 2016
Location: near Calgary, AB, Canada
Posts: 1,516
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Re: Almost burned my cart and garage down last night
Here is an interesting video that discusses how electricity (either AC or DC) can affect the human body.
Under the right conditions (which can be something as simple as wet skin), either AC or DC can kill you. https://www.youtube.com/watch?v=9iKD7vuq-rY |
09-03-2021, 07:39 PM | #15 | |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,947
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Re: Almost burned my cart and garage down last night
Quote:
Voltage doesn’t flow, current flows. The current that a battery back can deliver is absolutely irrelevant, as are watts or stored energy in electrocution as you can be electrocuted and killed by as little as 10mA, or 0.01A. That can be delivered by an AA battery under the correct conditions. A 48v pack can deliver 300A, but that is into an almost short circuit. Ohms law states that voltage=current x resistance, or V=IR, so R=V/I. For 300A to flow from a 48v pack, R=48/300 = 0.16ohm. The human body is nowhere near that. The resistance of the human body is affected by many factors and cannot be predicted accurately for any single person, so I measured mine With dry hands, squeezing tightly I got 3.5Mohm (3.5 million ohms) from one hand to the other. With wet hands it dropped to 1.5Mohm. At 48v, this equates to 0.013mA dry and 0.032mA wet. Well under the electrocution current. Me, being the adventurous type, and having a 72v Lithium pack that I’m in the middle of building thought “let’s get real world numbers” My 72V pack is currently at 70V, so we’ll use that figure. With dry hands, I MEASURED 0.001mA flowing through my body and with wet hands I MEASURED 0.004mA. The measure to was taken with one hand on the negative terminal, the positive probe of my multimeter on the positive terminal of the battery and my other hand touching the negative probe of the multimeter. The multimeter can resolve down to 0.001mA. I only felt the slightest of tingle when letting go with the wet hands and that would have been the current flow transitioning from directly through my skin to across my wet skin. I felt nothing the rest of the time. Using the above figures would indicate a dry resistance of 70Mohm and a wet resistance of 17.5Mohm. Anyhow, I’m still here, typing away and I stand by my previous post that you cannot be electrocuted by a 48v, or even a 72v battery pack, regardless of how much current it can supply as it cannot supply a current through your body that is able to electrocute you. You can however be severely burnt by touching something that is heating up due to a short circuit. My brother in law severely burned his wrist once when working on his car and his metal watch strap shorted 12v to ground. The band heated up and burnt him. That’s why you should remove all Jewelery when working around high current batteries. Cheers Pat. |
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