[shyampsunder]

Originally Posted by aim120

A typical EV these days come with a minimum of 3.3 kw or 7.2 kw charger. Unlike your air conditioner which switches OFF and ON for every 10 min, a EV charging is going to be consuming 7.2 kw of power even at 90% SOC. So the peak draw will also be for several hours and it will also be during peak demand when everyone plugs in during the same period. During this time geysers, air conditioning, lights will also be switched ON. In my house we run 4 x 1.5 ton inverter AC with just 7.2 kw main fuse and even at 100% load each, they consume less then 5.3 kw total and once the rooms are cooled they consume around 1.2 kw combined total for all four ACs. So its not even close when comparing a EV charger to other household appliances.

I am going to be sharing information based on my experience charging an EV on a 15A socket on a connection with 5 KW sanctioned load.

The max draw of the of the ZS EV's portable charger is only 9A. Have directly measured this on the socket. This translates to a load of approximately 2 KW. For Tata cars, it's 2.4 KW. There are portable chargers in the market, where you can go as low as 6A.

Does this mean it takes a long time to charge my EV? Yes, it does. But I don't really need quick charging while I am at home. I have a Jio BP hub which can charge 100+ cars at once and a Shell recharge 120 KW station within a 10 minute radius for any urgent needs. Haven't had the need to do this in close to an year of owning an EV

There are approximately 10 4W EVs in the society and no one has had to apply for a load increase or have faced any MD penalties.

[nidhikapoor]

Originally Posted by shyampsunder

. I have a Jio BP hub which can charge 100+ cars at once and a Shell recharge 120 KW station within a 10 minute radius for any urgent needs. Haven't had the need to do this in close to an year of owning an EV

There are approximately 10 4W EVs in the society and no one has had to apply for a load increase or have faced any MD penalties.

Jio has a 100 car station? Do they have these all over the country?

[ashivas89]

Folks here have missed mentioning one very crucial point: RWAs also need to maintain their own transformers. If every single resident were to load the transformers with an additional 3KW, they would degrade very quickly indeed. Transformers are incredibly expensive to repair, let alone replace.

I am the President of the RWA of the society I live in, and we are grappling with this very issue. We have a dedicated charging station with four points set up by Ather, whose utilization until this point is barely 50% (the station is served by our least loaded transformer, before you ask). We need to figure out a better load distribution. Going solar for all our common area needs is one way, but this will only take up a part of the load.

The argument stating that adoption is never 100%, and only a handful of residents are actually installing and using their setups at this point, is not sufficient for making exceptions. RWAs need to apply rules uniformly without exceptions and be careful not to set precedents that are hard to argue against in the future.

[shyampsunder]

Originally Posted by nidhikapoor

Jio has a 100 car station? Do they have these all over the country?

Jio is rapidly building out it's EV charging infra. They have around 7 such hubs in Bangalore and similar number in Delhi.

These charging stations are a mix of DC fast charging, AC fast charging and AC slow charging depending on what you need.

One such charging station

[aim120]

Originally Posted by ferrarirules

.

Now coming to the wiring why are people saying that it is going to be a problem, with 3.3 KW charger 2.5 sq mm wire is used and with 7 kw charger 4 sq mm wire is used. The wires are passed through fire proof conduit.

Finally on the people worried about wires running to each parking spot. I don't understand how this is different from PNG pipes running all across buildings to each flat.

The current rating of a wire depends on the length and the number of wires going in a conduit pipe. If a wire is rated for 32A which is 7.2 KW at 230v, it doesn't mean you put that wire. Normaly you upsize it, since that 32A rated wire will be hot to touch but not hot enough to burn the insulation.

If you ask me a 7.2 KW will require a minimum 6 sq.mm of wire or 10 sq.mm of wire if going via a conduit.

Originally Posted by shyampsunder

The max draw of the of the ZS EV's portable charger is only 9A. Have directly measured this on the socket. This translates to a load of approximately 2 KW. For Tata cars, it's 2.4 KW. There are portable chargers in the market, where you can go as low as 6A.

The actual charger is present in the car. There is no difference between a portable charger and the wall mount charger other then a fancy box and thicker charge cable for higher current and a higher rated relay. Some after market chargers changes the pilot signal pwm cycle to accept the user selected charge current to as high as 7 KW or the lowest accepted rate of the onboard charger.

[nidhikapoor]

Originally Posted by shyampsunder

Jio is rapidly building out it's EV charging infra. They have around 7 such hubs in Bangalore and similar number in Delhi.

These charging stations are a mix of DC fast charging, AC fast charging and AC slow charging depending on what you need.

One such charging stationAttachment 2516196

Thanks.

What is GBT?

And, I presume 'active' are the number that are inuse?

[vinaydatla]

I have been in the management committee of one of Hyderabad's largest RWAs for around 4 years with a population of around 10000 folks and 4000+ cars.

RWAs may not be able to provide individual charging stations for the below mentioned reasons:

1. The existing electrical infrastructure cannot support the load required for charging 4 wheelers

2. We cannot connect to individual flat's meter in high rise buildings as the meters are placed in the residing floor (say 24th floor) and the car is in basement #4 which is like 25-30 floors away.

3. A limited number of residents need electrical charging at this juncture and we cannot re-do common wiring at this point for a handful number of people

4. Additional infra setup like wiring, additional transformer etc. need to be with a general body meeting (GBM) with majority opinion

5. Charging providers avoid installing in basements due to exhaust and fire safety issues

Recent and under construction societies have started adding this as an amenity with extra cost during flat purchase.

PS: We have installed public charging stations for 4 wheelers and 2 wheelers at ground level and residents use them by booking slots over the charging provider app.

[shyampsunder]

Originally Posted by aim120

The actual charger is present in the car. There is no difference between a portable charger and the wall mount charger other then a fancy box and thicker charge cable for higher current and a higher rated relay. Some after market chargers changes the pilot signal pwm cycle to accept the user selected charge current to as high as 7 KW or the lowest accepted rate of the onboard charger.

You are right the AC to DC converter is present in the car but the default wall box connector provided by MG provides 6.6 KW of AC power vs 2 KW for the portable charger.

Have confirmed this both by checking at the charger level in terms of amps drawn on as well as within the car in terms of charging speed.

[vinaydatla]

Originally Posted by ike

Apologies for going OT but shouldn't each household have a separate connection from the utility company rather than one connection for a couple of thousand flats?

In Hyderabad, once the apartment complex crosses a certain three digit number in terms of the number of flats (around 250-300) then the apartment gets a High tension line (HT) connection and individual private meters need to be supplied by the builder during flat sale.

[sachind]

Originally Posted by Rodie09

Those who are installing on their own, if from meter rooms, are actually tampering with the designed and permitted electrical distribution.
Can be held liable if any thing goes wrong.

Why would you consider installing from the meter room tampering with the electrical distribution ? All residential chargers have to be installed by tapping power from the meter room. There are norms to be followed for increasing the load which the SEB prescribes and the installer follows.

In Maharashtra, the state government has mandated that the RWA (aka society) has to provide approval within a week of the application provided all criteria are met. See TOI article linked https://timesofindia.indiatimes.com/...w/96097209.cms

[Ltinsane]

Drawing power from individual's personal meter only works for smaller complexes with meters located near individual parking and only few people opt for EV charging stations. It won't work if everyone wants a charging station or for bigger complexes or where parking is scattered all over the place. Imagine the sheer number of cables running from meter box to individual parking spaces.

I have seen high rise apartment buildings where the individual meters are located on each floor of the building rather than a central location in basement so it will certainly not work there.

Few public charging stations provided by a third party will only work if there are very few EV adopters in the area.

What we need is a framework, a set of standard guidelines for setting up individual charging stations which depends upon the size and layout of the residential complex. One type of setup will not work everywhere.

Perhaps RWA's could setup few public charging stations till a certain number of EVs are present and once that number is achieved, the local electric distribution company can set up new central line with individual charging stations and individual meters tapping in to for EV users just like the Internet provider does.

[DevD]

Originally Posted by shyampsunder

This is exaggerating things quite a bit. 99% of EVs sold in India only need a 15A socket to charge.

Do we require RWA permission to buy a new fridge, washing machine, dishwasher, geyser or Air conditioner?

Why should RWA get involved in it?

The only reason for RWAs to get involved is to ensure that the wiring and equipment used is of high quality. While fire risk is overblown, one should always be wary of electrocution and ensure that wiring and ground connection is properly established.

Whatever we use/connect inside our flat is purely our business. Only energy companies will have a say if peak load is breached consistently. They will ask to upgrade the sanctioned load for the flat.

However in parking areas, only the parking space assigned to our flat belongs to us. All other areas (common areas, walls, pillars, etc) belongs to RWA. They have to take a decision considering the following:

1. Fire and safety risks
2. Sanctioned load for the society and transformer capacity
3. Feasibility of drawing wire and providing plug point as some parking may not have walls or pillars adjacent to their parking spot.
4. some residents want fast-charging setup
5. some residents will ask for a lock system so that their power point is not mis-used by others.

There is a separate thread that has more discussion on this issue.

https://www.team-bhp.com/forum/elect...ng-spot-5.html (Electrifying India's apartment buildings | How will you charge your EV in your parking spot?)

https://www.team-bhp.com/forum/elect...ing-my-ev.html (Electricity supply: Want to get load increase for charging my EV)

[udzgodfather]

Originally Posted by Captain Slow

Any advice on what can he do about this?

Looks like he will have to do this -

https://www.linkedin.com/feed/update...3553108590592/

Please ask him to stop charging the EV in the kitchen, its a hazard waiting to happen, even for the sake of putting there thoughts across, he should refrain from doing stuffs like this, not only he has put his family at risk but the other residents too, the same goes for removable batteries, moreover I second what RWA are saying, you can't mess up with the housing electricals, what if the electrician you hired did a shoddy job, it puts risk to each and everyone's electrical lines, chances of short circuiting again very high, and lastly I would have first dealt with my charging issues, before buying an EV, like where I am going to charge it, how I am going to charge it, the feud with RWA can go on for a long time, which could lead to the vehicle either unusable or to find charging either at office or some sub station which again is something that you have to plan very ahead.

[srini1785]

Some points which come to my mind.

1. The electrical distribution system in most apartment complexes can only support a trickle charger. Ones that take 4 hours to charge an Ather to 100% capacity (don't remember the exact time). Fast chargers are not supported as it would trip the system.

2. Parking lots with pre fitted smoke sensors and fire extinguishers are a must to allow EV charging especially in basement parking lots.

3. Community charging stations with 3-4 chargers using pre loaded smart cards and a dedicated line would be the ideal starting point for RWA's to explore EV charging.

4. Dedicated EV charging infra would involve laying a new HV line and a separate Transformer to charge the EV's. This would prevent uneven load scenarios on existing distribution transformer already in place.

All the above involves detailed planning/expenses and local Discom approvals which takes time.

[LoneRidder]

Originally Posted by bblost

Having served as the General Secretary for a large (2200+ flats) gated community in Hyderabad, this is my take on this.
[*]If someone buys a bike and wants a connection, same charges apply. This effectively makes Electric Bikes a non usable option for most people. Which in my honest opinion is very good.[/list]

Could you please elaborate on why you think this is very good?