Charging at a slow rate.

[bc1]

So if I plug in every night and can adjust my charge point, what would be the optimal rate and still get a recharge in 8 to 10 hours? I know you might say to trickle charge it or something but I can set my chargepoint hardwired station with a lower breaker/amperage rate than it currently has. I already have an ER battery and I've got it set for the 60 amp breaker which is the max it will put out which I believe is 48 kwh per hour.

Also does how far you regularly/daily run down the battery and recharge it back up (such as down to 0 to 30% and back up to 80 to 100%) compared to (such as down to 60 to 90% and back up to 80 to 100%) affect longevity of the battery pack? Thanks.

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[RickLightning]

So if I plug in every night and can adjust my charge point, what would be the optimal rate and still get a recharge in 8 to 10 hours? I know you might say to trickle charge it or something but I can set my chargepoint hardwired station with a lower breaker/amperage rate than it currently has. I already have an ER battery and I've got it set for the 60 amp breaker which is the max it will put out which I believe is 48 kwh per hour.

Also does how far you regularly/daily run down the battery and recharge it back up (such as down to 0 to 30% and back up to 80 to 100%) compared to (such as down to 60 to 90% and back up to 80 to 100%) affect longevity of the battery pack? Thanks.

Asked often.

Charge nightly. There is no difference between one charge from 20 to 90% and seven chargers from 80 to 90%, each uses 70% of a charge cycle. But the battery benefits from being plugged in during very cold temps, plus you're always "full" and ready to go.

As to amperage, there is a benefit to length of charge, i.e. it charges up the 12v battery longer. So, if you don't mind making changes, lowering your charge rate to be slower and still be ready by morning would benefit your 12v battery.

I have two chargers on a 60amp circuit, splitting 48amps. Software I used to have did load balancing, but no more. So, I have each set to 24amps.

 

[cwstnsko]

Unless I have something special planned, I charge my truck to 50 or 60% every night at 240V 10a. This seems to keep my 12V better maintained than charging it at 40-80a. If I have an longer drive planned, I do bump the charging rate up to 24-32a to ensure that I hit whatever higher target I set, overnight.

 

[chriserx]

I personally keep mine plugged in at full charge rate (30A), but if I read the question right and you want to throttle it over time and get a 'full' charge...

Start at your desired charge level then:
e) Determine estimated usage in kWh
v) Determine charge voltage in volts
t) Determine charge time in hours

e * 1000 / v / t = charge rate

Note: This will likely need adjusting if you intend to charge over 95% displayed SOC due to on board charger throttling.

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