what is the stake for charging station with solar roof

[Rabrrita]

Originally Posted by ggcd951

I'd rather see this popup in public locations. Now this is a challenge considering many technical engineering limitations other folkds here mentioned however the ideas with bigger storage I 'd wish it to be possible. This could be economically expensive however once setup, it is one time setup/installation that never needs maintenance (substantial) and non-renewable energy. Obviously people are not going to wait for their turn in this type of installation but more like being used for nightly charge or long term parking. Waiting is not an option considering how long it is done rather if driver sees open slot go ahead and claim or just bypass for next opportunity. Therefore, its location is best suited for not the gas station like location rather to be installed where people are going to spend longer hours: shopping malls, grocery etc.,

The problem is almost all EV charging station are starting to place time restriction on charging because as people use them for parking, their revenue decreases. So with limits of 45 to 120 minutes Level 3 chargers are the most popular within prime retail parking spaces. For Level 1 or 2, they are normally further back or on the sides as those take time to charge a vehicle. The problem I see is the battery. It's difficult enough to get some some developers/management companies companies to be willing to give up prime spots for dedicated EV charging let along more space for batteries.

[Submariner]

I am going to make series of assumptions here. Let us assume that your home is on-grid, you have a charging station in your carport, every afternoon when you get home you immediately plug-in your car to re-charge, you car charges overnight and is ready to go in the morning as you head back to work., and I will assume that you live in a region sufficiently urban so that grid outages are relatively rare. The last time that I really followed plug-in car usage, the average overnight re-charge cost approximately 15 cents [at residential rates].

If you were to double this and charge a person 30 cents to charge their vehicle, I do not see where you could ever recover your expenses.

[DCforever]

10 kWh X 12¢/kWh = $1.20 but still not really an economic proposition.

[Joe33]

Originally Posted by ggcd951

20KW is the rate of energy accumulation also another variable is also capability of the station to hold charge (KWh). If you got bigger battery pack with slower accumulation rate it can still be usable. I think it is all about finding that magic number. Lets say for 5 days nobody uses the station now it is able to accumulate all 5 days of charge and that would be good instead of bypassing that energy input due to lesser storage capability.

A volt had a battery pack that will hold about 17kwh of power. (Tesla's can be 80).
The sun dosent always shine. And when it does shine it dosent always put all the power into the solar cells. Especially if you are looking at this all year. So on average you may only get 4 hours per day of max power into your array.
Using a battery is silly. It costs you a lot in Array size. Your battery charger is seldom more efficient than 90% no matter what they say. Charging a battery itself is rarely more than 90% efficient and discharging a battery also takes power in the 10% range. SO by charging a battery you have already lost 30% of the power captured by the solar cells. Then using that battery to charge the car the losses start to stack up again and you may lose up to 50% of your total power generated by your Array.

Now. A 20KW Array will reasonably be able to charge the car without the Storage battery and associated equipment. Every day as long as the sun shines summer or winter. But Who had room for a 20KW array on their car port or House. Not many.

The big problem is that people are usually using their cars during the day so they can only charge them at night. That will result in a Larger Array due to the losses associated with storage.

[ggcd951]

lot of good opinions but you guys are introducing lot of variables. I was looking at purely from engineering feasibility perspective. Therefore please consider the hypothetical scenario that:
- all 6.4 billion people on earth do truly believe and agrees that renewable energy is the way to go to prevent impending global warming catastrophe and all have desire to adopt green energy at soonest possible time to a greatest extent possible.
- unlimited funds to research and develop the renewable energy solution so no sweating over cost effectiveness.

[Rabrrita]

Originally Posted by ggcd951

lot of good opinions but you guys are introducing lot of variables.

and you expect only specific focus responses based on a whopping fantasy?

Originally Posted by ggcd951

- all 6.4 billion people on earth do truly believe and agrees that renewable energy is the way to go to prevent impending global warming catastrophe and all have desire to adopt green energy at soonest possible time to a greatest extent possible.
- unlimited funds to research and develop the renewable energy solution so no sweating over cost effectiveness.

[ggcd951]

Originally Posted by Rabrrita

and you expect only specific focus responses based on a whopping fantasy?

ever heard of terms like divide and conquer, troubleshooting and problem isolation? If not, shut up and do your own business.

[Philip T]

Originally Posted by ggcd951

lot of good opinions but you guys are introducing lot of variables. I was looking at purely from engineering feasibility perspective. Therefore please consider the hypothetical scenario that:
- all 6.4 billion people on earth do truly believe and agrees that renewable energy is the way to go to prevent impending global warming catastrophe and all have desire to adopt green energy at soonest possible time to a greatest extent possible.
- unlimited funds to research and develop the renewable energy solution so no sweating over cost effectiveness.

Outside the Future Drama, and just doing the Math, then?

Sure -- all possible, not always practical.

Back during the Recovery Grant days (2009 to 2012 -- some still running out through 2016), we would build wildly excessive Solar PV, like I think you are speaking of.

We would load up on Utility Rebates + 30% of Construction Cost Treasury Grants + 20% USDA Grants (rural areas) and have the Job more than 100% paid for before we began. Because things were done in %, we made more money the more money we spent. So we went Big.

Folks would ask about tying on their Electric Car Charger -- like you are asking -- and the answer was, of course, always YES. Otherwise they would just be sending surplus up the Grid every month.

=============

In the Here and Now. Maybe so, Maybe no. The Treasury Grants have went away, the USDA has a somewhat harsher view, and the Utility Grants have toned down as Solar Gross Costs have dropped to half or less of what they were.

HOWEVER that all points to what is really happening. Almost ALL new generation IS Renewable. Coal Plants are going broke and falling off-line. No New Nukes are practical.

Your Renewable Future is already happening all around you. A few decades on this path, the past will be History, and most everything will be Renewable.

So. Just you can put on some Local Distributed Renewable Generation on your roof (or not), (DRG is our fancy name for your local Solar PV or Wind) -- grid tie it and get it back wherever you charge your car from whatever grid tied source is there.

Or just use Grid Power in the Here and Now, and know that it is going Greener-by-the-Day.

Strong growth for renewables expected through to 2030 - Bloomberg New Energy Finance