Everything you always wanted to know about electric vehicle (but were afraid to ask)

There are 2 limits on the energy recuperation.

First is the size of the motor. Bigger is better. In hybrids they are quite small in PHEVs they usually get bigger but much smaller than in EVs. Imagine that if you produce less mechanical energy in a given time with a smaller rated motor, the reverse is also true.

The second limiting factor is the battery size. Again bigger is better. In a small battery you can't add much energy in a short time even if the motor is able to produce it. Again hybrids have the smallest batteries ~<10kWh, PHEVs ~<15kWh while EVs roam around >50kWh.

I can workout numbers for each case but as a hand waving argument these 2 limitations put hybrids recuperation energy on a much lower scale compared to EVs.

Say you have to leave the motorway and slow down a 2t car from 120km/h to 60km/h that is around 200Wh energy difference or as charging goes 6 minutes on a 3 pin plug. The question is are you able to harvest it?

I see a few lads on here have fitted their own Dash Cam , I previously have always had mine fitted professionally by Halfords.

I see as I plan too pick up my new EV this week when I tried to book a fitting with Halfords and they are refusing to fit Dash cams on EV or PHEV

Anybody know what this is about ? Does anybody know a retailer who installs on EV vehicles at the same price point (~40 euro)

On further research I believe the units are Joules, kg and meters per second. 1 Joule = ! watt second so 3,600,000J = 1kwh so for a 2000kg car decelerating from 120km/h (33.3m/s) to 60km/h -

Energy = 3/4 x 1/2 x 2,000 x 33.3 x 33.3 = 831,000J = 0.23kwh

That is absolutely brilliant Paul. Joule is the unit for energy in SI. Now before @unkel comes and disagree we must mention the above model works in the assumption of a flat surface and of course we discount drag variation with speed, losses due to heat, etc.

Usually the motorway slips are slopped but that is very easy to account for using potential energy E_p=mgh. assume g=10m/s2 h =10 m (not sure how high a motorway bridge is but safe enough) delta E_p= 200 000 J (Ws) or about a quarter of the gain from the kinetic energy. The reverse is also true. If you go down 10m in altitude you gain 56 Wh

Lets stay with 200 Wh figure for the moment (we assume we slowdown to 50km/h to compensate for the difference). What would be a comfortable time to perform the deceleration? I googled and found something like 3.4 m/s2 which yields the time required to reduce speed of 4.7 ~5s. We can calculate the theoretical power we can recuperate as Power = Energy / time => 144kW lets call it 100 kW. You need a motor capable of generating such power (which a HEV will never have, a PHEV will barely but a BEV mostly) and also a battery capable of accepting this power and we can repeat: HEV never, PHEV unlikely BEV mostly. So here is why BEVs will always have better recuperation and of course better overall efficiency. Sorry for such long posts

Make sure its a pure sine wave inverter, the big question is, how much can you draw from the 12 v battery versus what rate it is being charged at from the traction battery.

Draw more than the charging rate and your 12 v is going to go flat after prolong heavy use.

I have a 1000 watt inverter, I would not use all of that 1000 watts for long periods only maybe half, I have used it on the well pump, but on and off as needed. I would believe that would be near its max capacity.

Modified sine wave inverter is the other type but it can damage some electronics, cannot say what .

Thanks guys. The Ioniq5 has a "UTIL" mode which keeps power on the battery though I haven't checked that it works yet! I presume reading the voltage on the 12v would verify it?

In the simplest case scenario it'd be grand just to cover power cuts so 700w travel kettle, maybe microwave, TV, lamps, gas boiler, wifi modem but obviously not all at the same time!

In a more advanced scenario it'd be nice if your home charger could draw back power from the car and feed it back into your mains system if you needed it or even if it made sense pricewise with stored night rate electricity. Does anything like that exist?

I am sure this has been asked before but...

Do I need to have an EV car already to apply for the charger grant? I would like to have a charger installed before my car is delivered. You need to first get grant approval before having the charger installed?

I don't think this has been mentioned yet, but it's up on the IEVOA website

No. Currently they are available to Tesla cars only.

Tesla Model S & X use the Type 2 looking plug, and Model 3/Y will use the CCS plug. The newer V3 sites are CCS only so Model S & X will need to use a CCS adaptor with V3 SuperChargers.

Currently Superchargers in Ireland are not part of the opening up trial thats taking place in Germany, Holland, France & Norway

Model S;

Model 3;

Is there a thread around recommended electricity tariffs? We've just had a smart meter fitted at home and the fitter recommended I look at a smart tariff that gives you a free days electricity per week on Saturday or Sunday and I figured charging an electric car once a week would be an ideal scenario for my use case.

Hoping to make the EV jump next year so would be interested to hear if anyone has has taken the above tariff or if there's another out there recommended?

Can a manufacturer remotely disable all their electric cars in a single country if they wanted to, if so can all do this? I recall Tesla had some update to security a few months back and owners had problems getting in to their cars.

In a Tesla all you have to do is remove the SIM card and omit cuts all communication with home base.

tehn just avoid Wi-Fi hotspots in case the car tries to connect that way..