Natalie from the ‘BZE Science and Solutions half-hour’ on Melbourne radio 3CR has some extra questions for us, after just lately taking supply of her very personal battery electrical automobile (BEV).
Hello Bryce: I’ve a number of questions re battery care / optimising battery life. I’ve heard various things about this, the most recent being finest battery care will probably be achieved by principally protecting the battery between 20 and 80 per cent charged.
Is there something on this? Does kind or fee of charging have an effect on battery life?
On the same subject, apparently there’s a Zappi EVSE popping out that’s three part and fees at 22kW (Yippee! Though my max photo voltaic manufacturing is 10kW so it could imply shopping for within the electrons).
Can all EVs cost at 22kW? If not, what would occur when you plugged it in with out realising? And…
Charging security – Is it protected to have the charger plugged into my automotive sitting out within the pouring rain – any hazards to concentrate on?
Hello Natalie – you do ask good questions!
The 22kW fee is just for three part related premises (= 7.2kW/part). Do you might have a 3 part connection?
Additionally, given you might have a Hyundai EV, then having 22kW AC charging capability is moot: they’ll solely do a most of single part 7kW on AC charging (and 70kW on DC charging).
The one EVs to do three part charging are the Renault Zoe (as much as 22kW), newer BMWi3 (as much as 11kW) and Teslas. (Newer Teslas as much as 16kW and older ones could possibly be optioned up with a 20kW charger).
You possibly can, after all, purchase an 11kW or 22kW DC charger to run on the three part system – however the further charging velocity is mostly pointless for dwelling charging. (Not to mention justify the price of such a charger).
As to what would occur to your system when you have been to plug a three part 22kW automotive right into a three part 22kW charger in your 10kW PV set-up… Nicely, the EV would pull 22kW and thus draw 12kW from the grid (assuming the PV output was at its most and there was no present drawn by the home – in any other case extra).
However, the Zappi EVSE you point out is able to being set to throttle again the EV cost fee to match the PV output.
By the way in which, Hyundai is rumoured to be going to three part 22kW subsequent yr – however we’ll see.
Most EVSEs nowadays might be set at set up for a most fee of charging (some may even be modified on the fly with a telephone app) plus some EVs have a setting for cost fee too. (Mannequin three for example might be set to recharge at full velocity at public AC chargers and a slower fee for dwelling charging).
Charging within the rain: Whereas EV plugs and sockets are IP rated for out of doors use, I’d nonetheless be certain they aren’t uncovered to the total brunt of driving wind and rain, or to go away any connections sitting in puddles. Mild to medium rain, and so forth, I’d haven’t any drawback with.
Ought to I hold my EV battery cost inside a 20-80 per cent vary? I’d flip the query round and ask who drives their fossil automotive to completely empty each time or at all times fills the tank to the brim? More often than not you’d solely be working inside that vary anyway. It’s solely on lengthy journeys that the 20% and 80% boundaries would have to be crossed.
Is it higher for the battery? The producers construct in buffers at both finish, so 20 per cent and 80 per cent on the gauge should not completely actual measures anyway. For example, the Kona electrical has a 69kWh battery, however is billed as ‘64kW usable’.
In follow: draining to ‘empty’ and charging to ‘full’ doesn’t appear to have an effect on battery life a lot, if in any respect.
It could be ‘kinder’ to the battery when you cost to 80 per cent and simply cost to full when it’s actually wanted. (Identical to you’ll hardly ever fully fill an ICE automobile.) However there may be truly no empirical proof to help the necessity for protecting to a most of 80 per cent for EV charging.
Does charging kind have an effect on the lifetime of the battery? DC fast-charging could possibly be a suspect right here: being sooner, it warms the battery way more than a regular AC cost – and warmth for something electrical is the enemy.
Particularly, early Leafs (2011 – 2014) did present this drawback – however no different producers appear to have ever had it because of their incorporating energetic cooling methods into their battery packs.
There was additionally what was known as ‘Leafgate’ just lately, the place early 40kW Leafs would throttle again the DC charging fee based mostly on inner battery temperature as Nissan appeared to nonetheless be nervous about this impact: however later variations have had this ‘function’ eliminated, or not less than diminished.
(The Nissan Leaf is the one EV to not have any type of energetic cooling of the battery pack – subsequently it’s the probably candidate for battery degradation because of extreme warmth).
However – as talked about above – no such impact has been proven for some other EV. In Scandinavian international locations, Teslas have been used as taxis since 2014, and their expertise with a lot greater than common DC charging use is that it doesn’t speed up battery degradation.
For instance, Finnish Tesla taxi driver Ari Nyyssönen has racked up a formidable 400,000 kilometres in his – and nonetheless has 93 per cent of his preliminary battery capability.
To listen to the Science and Options half-hour, in Melbourne you possibly can tune to 855kHz on the AM dial between eight.30 and 9am on Fridays. Elsewhere you possibly can hear dwell by way of the net, or obtain the podcasts at https://www.3cr.org.au/beyondzeroscience