Charging 10%-100% every 3-6 months

pecker · Feb 20, 2024

I can't anything online one way or the other, I'm going to do it in one charge tonight even though my wallet isn't happy about it

Interested to hear how others are doing it though

siteguru · Feb 20, 2024

Tight Git said:
Over 2 nights will be absolutely fine.

I admire your confidence, especially given that none of us actually knows for sure.

salty · Feb 20, 2024

Put it on charge earlier, than your cheap rate starts. Once every 3 to 6 months, isn't going to break the bank, is it?

pecker · Feb 20, 2024

siteguru said:
I admire your confidence, especially given that none of us actually knows for sure.

Agreed

I could ask MG although it's not always easy putting this like this into words, this thread shows that lol

siteguru · Feb 20, 2024

pecker said:
I can't anything online one way or the other, I'm going to do it in one charge tonight even though my wallet isn't happy about it

How many kWh are likely to be outside the "cheap" period?

If you start at 10% then that is ~6.1kWh. 5 hours at 6.5kW will give 32.5kWh, making a total charge of ~38.6kWh. So you'd need another, say, 24kWh (including balancing) at the higher rate. Multiply that by your (higher rate - cheaper rate) then divide by 0.9 (with the assumption that charging efficiency is 90%) and you'll have your extra cost.

pecker · Feb 20, 2024

salty said:
Put it on charge earlier, than your cheap rate starts. Once every 3 to 6 months, isn't going to break the bank, is it?

That's what I decided, I'd just like to know the correct process now though, it's bugging me

siteguru · Feb 20, 2024

Do what you're doing ... it's not going to break the bank doing it every 6 months, and you'll have peace of mind.

pecker · Feb 20, 2024

siteguru said:
How many kWh are likely to be outside the "cheap" period?

If you start at 10% then that is ~6.1kWh. 5 hours at 6.5kW will give 32.5kWh, making a total charge of ~38.6kWh. So you'd need another, say, 24kWh (including balancing) at the higher rate. Multiply that by your (higher rate - cheaper rate) then divide by 0.9 (with the assumption that charging efficiency is 90%) and you'll have your extra cost.

The harder thing to work out is how long it will take, the app reckons if I start now it will be finished around 4am, does that include balancing though ?

siteguru · Feb 20, 2024

Probably not, as it's merely an estimate based on the current rate of charge. When balancing the state of charge is already at "100%" and the finish time keeps updating as the current time, until the balancing actually finishes (which may take 10 minutes to an hour, depending on what the BMS works out what it needs).

Don't worry if balancing takes an hour ... the cost is based on capacity (kWh) not how fast it is delivered (kW). An average of, say, 100W charge rate whilst balancing for an hour is only 100Wh, or 0.1kWh.

salty · Feb 20, 2024

siteguru said:
Do what you're doing ... it's not going to break the bank doing it every 6 months, and you'll have peace of mind.

Is there an Echo?

siteguru · Feb 20, 2024

salty said:
Is there an Echo?

No, because you didn't assuage his peace of mind.

Rolfe · Feb 20, 2024

I've done mine twice. Down to under 10% in the evening, timed deliberately for the day before a day when I knew I wouldn't need the car. Plugged in to granny charger and left. Takes about 26 hours. Plug didn't even get warm.

But then I don't have a variable tariff, so it doesn't make any difference to me. If I had a wall box I'd just make sure that the time, which would be about eight hours, took in the entire cheap-rate period for that day. In the grand scheme of thing, it's pocket change.

salty · Feb 20, 2024

siteguru said:
No, because you didn't assuage his peace of mind.

That's spooky, I always say if you hear or read a word you haven't heard/read before, you'll hear/read it again soon afterwards. And you've said "assuage" which was an answer in today's crossword I did. Had to cheat on that one though, I'd never heard of of it.

Ian Key · Feb 21, 2024

Assuage: to make unpleasant feelings less strong.

To save others looking it up

Ian Key · Feb 21, 2024

@tsedge Perhaps the question of whether the 6 monthly balance charge from 10% to 100% should be done in one charging session or if it can be split over two sessions could be put to @Miles Roberts CG at the next podcast?

pecker · Feb 21, 2024

Ian Key said:
@tsedge Perhaps the question of whether the 6 monthly balance charge from 10% to 100% should be done in one charging session or if it can be split over two sessions could be put to @Miles Roberts CG at the next podcast

Great idea, I'm currently listening to Decembers podcast

MGFour · Feb 21, 2024

Also what tariff are you on? If intelligent octopus just plug in as early as possible and request 100% charge by say 9am and if it decides needs to be charged out of normal overnight cheap hours I think all the units will be at cheap rate to achieve what supply you asked for

pecker · Feb 21, 2024

MGFour said:
Also what tariff are you on? If intelligent octopus just plug in as early as possible and request 100% charge by say 9am and if it decides needs to be charged out of normal overnight cheap hours I think all the units will be at cheap rate to achieve what supply you asked for

I don't have a compatible charger for IO unfortunately

Rolfe · Feb 21, 2024

I think there are two questions. One is whether it's OK to interrupt the charge in the middle without driving the car (say to avoid peak-rate charges, or if you're on one of those Blink chargers that cuts the power after 4 hours and you have to go back and start it again), and the other is whether it's OK to drive the car in the middle of the charge, so long as you don't put it on a DC charger.

I suspect the first may be OK but I don't think the second will meet the requirements. Though what do I know?

Mickser · Feb 21, 2024

pecker said:
Apologies in advance because I know this has been discussed before.

I'm currently running my SOC to around 10% so I can do the 10% - 100% charge and balance the battery, however I have an off peak tariff (5 hours) and don't think my car will get to 100% in that window.

The manual states this should be done every 3-6 months.

Is it ok to let it charge to whatever % it gets to in my charging window and then finish it off to 100% the next night ?

Otherwise I will be paying the higher electric rate getting it to 100% in one night.

Hope this makes sense,

Thanks

Andy

The reason for the charge is so the BMS can tell the scope of the battery pack, so I would charge in one go, it's only every 6 months so it won't break the bank.

Charging 10%-100% every 3-6 months

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