Flooded EV Catches Fire

ChasingCoral

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No anti-EV hype here, just common sense. Vehicles flooded with saltwater are almost certainly totaled (https://www.consumerreports.org/money/car-insurance/why-flooded-out-cars-are-likely-total-losses-a9926753411/#:~:text=Car owners with a vehicle,on their car insurance coverage.)

If an EV is flooded with saltwater, you should probably disconnect the HVB and tow it to an open area, at least 50' from buildings and somewhere fire crews can get to it if a fire starts.

https://www.cbsnews.com/news/hurricane-idalia-electric-car-caught-fire-tesla/
As Hurricane Idalia caused flooding, some electric vehicles exposed to saltwater caught fire
Ford Mustang Mach-E Flooded EV Catches Fire {filename}
BY MEGAN CERULLO
SEPTEMBER 1, 2023 / 4:49 PM / MONEYWATCH

Floridians battered by Hurricane Idalia this week may not have expected another threat — that floodwaters could cause their cars to suddenly burst into flames.

Yet that's exactly what happened when two electric vehicles caught fire after being submerged in saltwater churned up by the storm. Firefighters in Palm Harbor, Florida, cited the incidents, both of which involved Teslas, in warning owners that their rechargeable car batteries could combust if exposed to saltwater.

"If you own a hybrid or electric vehicle that has come into contact with saltwater due to recent flooding within the last 24 hours, it is crucial to relocate the vehicle from your garage without delay," the department said in a Facebook post. "Saltwater exposure can trigger combustion in lithium-ion batteries. If possible, transfer your vehicle to higher ground."

The warning also applies to electric golf carts, scooters and bicycles, with lithium-ion batteries potentially sparking a fire when they get wet. More specifically, salt residue remains after the water dries out and can create "bridges" between the battery's cells, potentially creating electrical connections that can spark a fire.

Lithium-ion battery packs consist of a group of cells inside a compartment and contain a flammable liquid electrolyte. EV and plug-in hybrid vehicles have about 1,000 times more cells than an e-bike, according to a report by the CBS News Innovation Lab. Higher energy batteries with more cells are at greater risk of failing.

In Florida, fire crews were towing one of the vehicles, a Tesla that had been submerged in Pinellas County, Florida, when it abruptly went up in flames, Palm Harbor Fire Rescue training chief Jason Haynes told CBS MoneyWatch. He said combustion can occur well after a car is exposed to saltwater and emphasized the importance of moving potentially damaged vehicles out of garages and away from nearby structures.

Ford Mustang Mach-E Flooded EV Catches Fire gettyimages-1648496539

Cars sit in floodwaters from Hurricane Idalia after it passed offshore on August 30, 2023, in Tarpon Springs, Florida./ GETTY IMAGES

Tesla warns car owners about the risks of vehicle submersion and advises against driving a car that has been flooded. "Treat your vehicle as if it has been in an accident and contact your insurance company," the company says in its guidance for handling a submerged vehicle.

"Safely tow or move the vehicle at least 50 ft (15 m) from structures or other combustible materials such as other cars and personal property," the company adds.

Fires can ignite weeks after flooding
Fires linked to a soggy lithium-ion battery don't necessarily occur immediately after exposure, underscoring the importance of having a vehicle that has taken on water inspected by a professional.

"And it can take from days to weeks later," Patrick Olsen, spokesperson for Carfax, which sells new and used vehicles, told CBS MoneyWatch.

Some EV owners are unaware of the risks from flooding, he added. "I have heard EV owners say, 'I don't have an engine that can be flooded so I can drive in deep water.' That's not the case."

Andrew Klock, head of electric vehicle training for firefighters for the National Fire Protection Association, explained that electric vehicles are not inherently more dangerous than gas-powered cars and trucks provided that everyone — from motorists to emergency responders — know how to deal with flooding incidents.

Even firefighters may not know how to properly extinguish an EV battery fire. "Often they don't direct the water to the proper place," which for electric cars would be under the chassis, where batteries are located.

"If you don't do that and keep dumping water on top, it won't necessarily make its way down to where the battery is," he said.
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ChasingCoral

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ChasingCoral

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I have two theories for why this happens with Teslas more than other EVs:

1. Statistical probability: there are lots more Teslas out there
2. Automated systems like Sentry mode may make it more likely for a parked Tesla to turn on its HVB. Sentry can be a big battery drain, making it more likely the HVB will be turned on to recharge the LVB.

In the case of the Tesla being towed, it is possible the tow truck operator didn't know they should disconnect before towing the Tesla and towing may have activated regenerative braking or the disturbance activated Sentry mode.

Ford EVs have very few systems that run in key off when not on a charger. This makes HVB connection of an inactive vehicle less likely. However, the same safety concerns should be applied.
 

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mikeinet

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Yep...this is how I got a EV.... my ICE car got flooded during Hurricane Ida a few years ago and insurance totalled it right away even though it was driving OK... "the risk of corrison and things breaking are just too high and not worth it"
 
 







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