Into the Night
Verified User
750 k cir mil copper stranded 600 V rated weighs 8.33 lbs. a foot. Try hundreds of pounds of cable even running just a short distance. Hence why you need a wench, a come-along and you better buy a big jug of pull soap along with a kellems (slang for pull sock). The wench and pull sock are necessary to pull the cable. The come-along is necessary to bend the cable flat for pulling because you can't do any of that by hand with cable that big. You'll also have to put in several runs of conduit as 2 750's + your ground cable from the street won't all fit in any of the normal trade sizes of EMT or NMC that you can easily buy.
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Of course, any conduit over 1" requires hydraulic bending or use of pre-bent elbows. For burial, it's PVC but you need a heater or prebends for elbows, etc.
Okay, Washington state is more virulent on regulations than Arizona. I can see that. An engineering stamp will run you anywhere from about $500 to $5000 to get depending on the guy you hire.
I'd also think a charge that fast is going to generate a lot of heat as a side effect. That could be a real hazard...
The car will reject such a charging rate to protect the battery (and pass transistor). That heat is caused by the battery's internal resistance. It is a portion of the energy going into the battery.
Like an incandescent light bulb, some of that energy goes into the desired effect (charging the battery). The rest goes into useless heat.
Yes. Ramming that much current into most any battery will start a fire in many battery packs. Once started, of course, Li-ion batteries burn like a firework. You can put an individual one out with water, but with a pack, you have to treat it like a class C fire. CO2 extinguishers will work best here, but ABC chemical extinguishers are also very effective if you don't mind the mess.
Your note about pulling this type of cable is certainly valid. Any high current charging station will have to do this cable pull for at least two cables (assuming an ungrounded system). That requirement depends somewhat on local code. Most places will require a grounded system.