Why should you not charge to 100% permanently?

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Activ8
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Post by Activ8 »

Thanks @CrowSysE243. Appreciated.
Very helpful and useful info.

So a solar DC to DC charge would potentially be the most efficient?
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CrowSysE243
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Post by CrowSysE243 »

Potentially but it is not likely to be much more efficient. As the DC voltage and output current from the solar panels varies depending on the amount of illumination there would still need to be a dc-dc convertor to ensure that the correct voltage is delivered to the car. The charger would need to negotiate with the car and deliver the voltage and current requested dependent on the battery temperature and charge state. In effect it would have to have all the functionality that is built in to the car for AC charging except for the rectifier. Under optimum conditions, delivering its maximum design power when the solar panels are delivering their maximum power, it could probably achieve around 98% efficiency but at lower power the efficiency would be likely to reduce.
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orrery
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Post by orrery »

ricky10 wrote: Fri Jun 28, 2024 7:13 pm Current crop of EV don’t have battery health information...

After a service, the Nissan dealer would always present me with a report showing how well I'd behaved charging my Leaf, avoiding charging to 100%. How they sensed that, I don't know, but the BMS must record it somewhere.
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Activ8
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Post by Activ8 »

Interesting.

I wonder if the OBDEleven Pro package can interogate the BMS and vehicle battery?
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Activ8
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Post by Activ8 »

Safety - the main reason is safety.
A fully charged battery "sat" on the drive is apparently many times more dangerous or unsafe according to Škoda. Better used and drawn down.
Whilst the cars safety features would contain any instability the easiest way to control the energy storage safely , is simply not to fully charge.
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Walter Eagle
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Post by Walter Eagle »

Activ8 wrote: Fri Jul 05, 2024 9:20 am Safety - the main reason is safety.
A fully charged battery "sat" on the drive is apparently many times more dangerous or unsafe according to Škoda. Better used and drawn down.
Whilst the cars safety features would contain any instability the easiest way to control the energy storage safely , is simply not to fully charge.
So, by the same argument, ICE drivers shouldn't fill their tanks?
If the safety issue is dependent on energy density (the amount of energy contained within a car-sized volume) thereferore ... what?

(I nearly wrote about the comparison and contrast between chemical energy and electrical energy. Oops. But then I remembered. Batteries hold chemical energy too. They're not capacitors, which do hold elelctrical energy.)
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Post by kdwolf »

orrery wrote: Mon Jul 01, 2024 2:38 pm After a service, the Nissan dealer would always present me with a report showing how well I'd behaved charging my Leaf, avoiding charging to 100%. How they sensed that, I don't know, but the BMS must record it somewhere.
Ditto with my old Nissan too.
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Activ8
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Post by Activ8 »

Walter Eagle wrote: Fri Jul 05, 2024 1:09 pm
Activ8 wrote: Fri Jul 05, 2024 9:20 am Safety - the main reason is safety.
A fully charged battery "sat" on the drive is apparently many times more dangerous or unsafe according to Škoda. Better used and drawn down.
Whilst the cars safety features would contain any instability the easiest way to control the energy storage safely , is simply not to fully charge.
So, by the same argument, ICE drivers shouldn't fill their tanks?
If the safety issue is dependent on energy density (the amount of energy contained within a car-sized volume) thereferore ... what?

(I nearly wrote about the comparison and contrast between chemical energy and electrical energy. Oops. But then I remembered. Batteries hold chemical energy too. They're not capacitors, which do hold elelctrical energy.)
Appreciate the reply.
Surely the comparison only makes comparative sense if you maxxed out and brimmed the fuel tank?
Then the external factors acting on both energy stores could be compared for safety?
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ricky10
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Post by ricky10 »

There is absolutely no increase safety risk with 100% battery.

Across the face of the planet every dealership has their demo cars plugged in at 100% charge. Are they worried about the inherent increased safety risk?! Are they paying higher insurance?!

What a load of FAD
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Activ8
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Post by Activ8 »

Hmmm.
I asked the Sales Exec about the status of the EV's in the showroom at the VW and Skoda dealership we bought from.

I was told they were all on trickle chargers to 80% at their dealership, which in hindsight makes sense if you follow the guidelines. I cannot comment about all the planets EV dealerships but you might be right?

The battery conditioning function in our SW4.1 car limits the charge to 80% unless its overridden - a touch control switch.

I thought it was a fair question tbh?
Its my first EV so its a learning curve for this family!

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