Portable solar power and EV?

Portable solar power and EV?


Would something like this work/ is it practical to charge the model S? Also, does anyone know if it's possible to charge the car while it is in use (turned on)?

BYT | 16 août 2012

3 x AC standard US outlets 110V AC 60Hz pure-sine wave, 1200W max total continuous, 1500W max short-duration which calculated to 10.9 AMPS, not enough to charge the Model S but maybe enough to keep it trickle charged? Anyone know if the Model S would even take such low amperage?

If so, this would be a great solution for those of you who park the Model S outdoors in extreme cold and hot temperatures perhaps? Not a huge investment either, ~$2,500 with an extra set of panels.

brewdr | 16 août 2012

Comments on the website said that one of the drawbacks was the fact that this is a lead acid battery. I would think there would be a Li-ion solution that would be lighter and last longer.

EdG | 16 août 2012

See and you can follow other links there.

The site says it's 30 watts. That's peak, at the best time of a sunny day when there is no shadow on the panel and it's aimed properly.

So if your 85kWh battery needed 60kWh of recharging, it would only take 2000 hours of perfect charging to fill-er-up. If you could get 8 hours equivalent perfect charging per day, that's only 2/3 of a year. During that time, the Model S would have to keep itself in shape, so it would probably be longer than that, perhaps indefinitely long if the car used more than an average of 10 watts per hour.

All for $2000.

NotTarts | 16 août 2012

Most power sockets around the world are rated at 10A (albeit at 230-250V). Tesla has 110V/12A listed on the charging page so it wouldn't be a huge stretch for 110V/10.9A to work.

Butch | 16 août 2012

The real issue is the area it takes to generate reasonable charge power with solar PV. Take a look at the size of my solar panels: That is my garage with the new Roadster in it on arrival day 3 years ago. Those panels on the roof are 9.8kW DC. After transmission, conversion, etc. losses, the best I get is 8.6kW 240V AC, mid-day, with no clouds. Because on the average day, I produce 40-50 kWh, I easily produce more solar power than my Tesla uses, however, the utility is a wonderful, free, virtual battery for this effort and makes the averages work out. That's the beauty of grid-tied, net metering; make more than you use, put it in the grid and run the meter backward; use more than you make, pull power from the grid and the meter runs forward...

It is just impractical to get enough solar power from a reasonable-sized, portable solar array to charge and electric car.

Because of the problem of ripping out the charging cord from the wall, the Roadster, all J1772 connections, and I assume the Model S will not let you "start" the car while the charging port is open.


Jhall118 | 16 août 2012

Thanks for the input. I am more looking for something to throw in the trunk in case of emergencies on road trips, or to extend the range a bit for camping adventures (not off road of course).

Perhaps there is a decent back up battery on the market you could charge at home and bring with you?

Butch | 16 août 2012

@Jhall18: Just keep the mobile charging cable in the car with the NEMA 5-15 (standard 120V wall outlet) and the NEMA 14-50 (240V, 50A RV and Range outlet) in the car. In an emergency, the 5 MPH of charge that you can get from any outlet (even from a generator) is worth something. On camping trips, use a 50 Amp outlet at an RV park. Most RV parks have a decent day-use rate, and a rec room with Wi-Fi. At 31 MPH, you can get enough miles to extend the trip pretty quickly.

BTW, everyone should carry the J1772 adapter and mobile cable with them on longer trips with the NEMA 5-15 and NEMA 14-50 adapters for just this reason.

EdG | 16 août 2012

@Jhall118: Just think of the first 80% of your battery as the battery, and the last 20% as your spare. Carrying a separate battery for backup is just changing your decision point slightly. Gonna get a backup for the backup for times you assume the backup is there and run that dry, too?

BYT | 16 août 2012

I would be interested in a solution like this for when I take my Model S camping and would use the power to run some tunes, keep the cabin warm on freezing nights as I have a queen size bed in the back seat with the passenger seats down and still have enough charge to drive me home after that weekend of camping. Aside from having the Model S there (yes, I know, not really roughing it) but then there would be no plug around for miles and I wouldn't want to be stranded.

EdG | 16 août 2012

I'd hoped to drive it to camping (not an RV park, just a spot to park off road near the woods) and leave it for a few days to charge itself up. Unless I park near a waterfall and set up hydroelectric charging, it's not happening.

licmil | 18 février 2014

Is Tespack a subsidiary company from Tesla??? , they have some batteries but way too small compared to the requirements of my S, however interesting concept for emergency energy

Brian H | 19 février 2014

AFAIK, TM has no subsidiaries. This appears to be an independent Finnish firm, and their "About Us" page says, "Tespack’s name was taken after Mr Nikola Tesla;".

Docrob | 19 février 2014

The battery in that device contains enough energy to take your car an additional 3.5 miles and the solar panel at 30W will give you an additional ~530 yards of range per full day of charging...