[from another thread]
Originally Posted by pauledg
I used a 10A cable as this is cheaper than using the wall charger - the wall charger almost completes the charge at full price before the offpeak hour arrives. Remember the car and charger neither have any means of timing the charge, a big minus point. Woke up to find email saying battery charged to 100%, range 105.6 miles, and the light on the charge cable still indicating charging ongoing; this went out after another hour so what it was doing during that hour I don't know. I've noticed previously that the charging light suggests charge goes on for a lot longer than predicted. If the charge really does complete earlier then I'll have to plug in via an accessory timer so charging begins at 12.30 to ensure best value.
Yeah. Dead right. Very miserable that there is no charge timer option.
I think this is something we could hassle Renault to do a software update for, surely?
I don't have off-peak. I did a few calcs and I don't think the extra monthly premium off-sets the benefits, in my case, because we seem to get through a fair bit of juice in the day time (when the rate would be otherwise higher).
The other thing, of course, is that having a flat rate means you can 'happily' plug in at any time convenient to yourself, and not get anal about only charging up at night.
My main reason for wanting to time charging is to avoid charging the battery to 100%. LMO battery life is much extended if charging dithers around the 50% mark all the time, than undergoing excursions to the limits.
...and the other thing (still to be experienced) is that the book says the pre-heater facility ONLY works once the battery is charged to 100%.
BAH! So if I need a quick charge for a trip, but wouldn't reach 100% in the time I have to do the recharge, I can't turn the heating on!! How STUPID is that!? Instead, we have to charge the battery up, then
heat the car up on the battery once it is disconnected! What a waste of energy!
other thing is that when it is cold, it is good to be charging just before the car is used, because there is residual heat generated during charging that will aid the battery performance. But, oh no!!, Renault have decided 'no timer' and to charge the battery up early. It then goes cold over night and you end up with a fully charged, but cold, battery when you could just have easily had a fully charged WARM battery.
That being said, I am equally dismayed that the wall charger isn't fitted with a little timer. For £1300 (or whatever they are charging the Gov for the privilege of fitted me out with one), surely
a £2 timer circuit would be a trivial inclusion?
....Maybe I could make my own little rotary actuator that rotates the key at a given time of my choice??!! That's a thought!....