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Piles of Tesla owners stranded at charge stations abandons their EV's.
David Hess:
--- Quote from: vad on January 17, 2024, 07:37:52 pm ---
--- Quote from: tom66 on January 17, 2024, 04:36:44 pm ---I suspect a few solar panels is easier, you only need about 1kW to charge most EVs. Also, not competing between your food and fuel demands is good.
--- End quote ---
I am not an expert on solar, but according to a Forbes article a 1 kW solar system produces 750-850 kWh annually for average installation in North America. So charging Tesla Model 3 from 20% to 80% would take a whopping 2-3 weeks on average depending on battery option.
--- End quote ---
1kW is the lowest common denominator because the common North America 120VAC 15A circuit provides a little more than that; typically 1.2kW without power factor correction. Dedicated home chargers are more like 240VAC at 30A providing up to 7.2kW so could fully charge a Tesla battery overnight.
Few solar installations are limited to 1kW.
vad:
--- Quote from: David Hess on January 17, 2024, 07:46:54 pm ---
--- Quote from: vad on January 17, 2024, 07:37:52 pm ---
--- Quote from: tom66 on January 17, 2024, 04:36:44 pm ---I suspect a few solar panels is easier, you only need about 1kW to charge most EVs. Also, not competing between your food and fuel demands is good.
--- End quote ---
I am not an expert on solar, but according to a Forbes article a 1 kW solar system produces 750-850 kWh annually for average installation in North America. So charging Tesla Model 3 from 20% to 80% would take a whopping 2-3 weeks on average depending on battery option.
--- End quote ---
1kW is the lowest common denominator because the common North America 120VAC 15A circuit provides a little more than that; typically 1.2kW without power factor correction. Dedicated home chargers are more like 240VAC at 30A providing up to 7.2kW so could fully charge a Tesla battery overnight.
Few solar installations are limited to 1kW.
--- End quote ---
According to the National Electrical Code, a 240V, 30A receptacle can only sustain a continuous draw of 5,760W. Charging overnight qualifies as a continuous load. However, the main point is that a 1 kW supply from the grid is impractical for charging a typical EV at home, and 1 kW solar is ridiculously low for this purpose.
nctnico:
--- Quote from: mikeselectricstuff on January 17, 2024, 05:42:13 pm ---
--- Quote from: tom66 on January 17, 2024, 04:36:44 pm ---
How large of a field of crops would you need to power one car? I suspect a few solar panels is easier, you only need about 1kW to charge most EVs. Also, not competing between your food and fuel demands is good.
--- End quote ---
Many EVs will charge down to about 100V, so with the minimum J1772 rate of 6A it could be as low as 600W, though effificency likely poor due to baseline draw of whatever car systems are powerd on during charging.
--- End quote ---
Efficiency is also a point. The German ADAC tested charging efficiency for BEVs from a 230V 16A outlet and measured losses up to 30%.
PlainName:
--- Quote from: mikeselectricstuff on January 17, 2024, 05:39:33 pm ---
--- Quote from: themadhippy on January 17, 2024, 05:01:15 pm ---If the apocalypse involved or caused a large electromagnetic pulse i wouldnt hold much hope of any ev,or any modern vehicle to be much use.
--- End quote ---
The metal car body would provide quite a lot of protection. Especially if it was switched off at the time.
--- End quote ---
It's steel. You need tinfoil for proper protection.
Dan123456:
--- Quote from: tom66 on January 17, 2024, 04:36:44 pm ---
--- Quote from: nctnico on January 17, 2024, 04:06:44 pm ---
--- Quote from: tom66 on January 17, 2024, 03:47:52 pm ---- EV is more sustainable for an itinerant lifestyle (off-the-grid).
--- End quote ---
No. Gasoline cars can run on ethanol which you can make from plants. Same for diesel. For electricity you need some form of generation and batteries. Neither last decades. Keep in mind that there are people driving around in model-T Fords which are over 100 years old. Also, you can't store electricity very long but liquid fuel can be stored much longer so you can drive all year long with an ICE car in case you are living in an area with large seasonal changes in the weather.
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How large of a field of crops would you need to power one car? I suspect a few solar panels is easier, you only need about 1kW to charge most EVs. Also, not competing between your food and fuel demands is good.
The long term calendar aging of Li-ion batteries is a risk, agreed.
--- End quote ---
Surprisingly, the field wouldn’t need to be that big! :)
“Through research performed at Cornell University, we know that 1 acre of land can yield about 7,110 pounds (3,225 kg) of corn, which can be processed into 328 gallons (1240.61 liters) of ethanol. That is about 26.1 pounds (11.84 kg) of corn per gallon.”
https://auto.howstuffworks.com/fuel-efficiency/alternative-fuels/question707.htm
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