Has anyone built / installed a dedicated solar charging station? If so, would you please share your design specs?
How many miles do you do in the car? My Bolt EV uses a lot more annual. Its about 4 miles per kWh, so 10000 miles uses 2500 kWh or 2.5 MWh. So, for the average 12000 miles annual, most Bolt EVs should be burning 3 MWh per year. So, unless you drive a very few miles, 4000 miles a year, your numbers are a bit off. Not as though its very important to anyone but me, my roof solar gives my 10 MWh per year, and I use 2-3 MWh per year driving.Ditto. My car is solar powered. The grid is my energy storage ["battery"]. I make about 6 mWh/year, use about 5 for the house and 1 for the car.
I'm wondering why you think this? Have you read the SAE J1772 charging protocol? There is a 1 kHz control pilot signal whose PWM duty cycle indicates the charger's current capacity. It ranges from 6 to 48A. If you have knowledge of the Bolt's interpretation of this then please share. It could be that it is only sampled at the start of a session, but even so, would the Bolt abort the session if the charging current drops?The Bolt would need a continuous draw from an EV charging unit
That should do just about anything.This is the roof of the place that has the solar powered EVSE's .... I'm sending you info in response to your PM. It's a 72kW system, they have a website to look at the efficiency, so forth. Even when it's raining like today, it is putting out some serious power. I don't know much about the infrastructure, I'll let you talk to them directly.
And indeed they are off -- my apologies. If I did all my charging at home, it'd be about 2 mWh/year - we don't put a lot of miles on the Bolt. So to make my claim of a solar powered car be correct, I will have to turn some lights of in the house...How many miles do you do in the car? My Bolt EV uses a lot more annual. Its about 4 miles per kWh, so 10000 miles uses 2500 kWh or 2.5 MWh. So, for the average 12000 miles annual, most Bolt EVs should be burning 3 MWh per year. So, unless you drive a very few miles, 4000 miles a year, your numbers are a bit off.
One option you may want to look at is that some SMA inverters have what they call a "secure power supply," one outlet that can be run from the inverter when the grid is down. No batteries required. I have this and I've used it a few times to charge the car. Mine will only charge the car at 110v/8A using the supplied cord, even when the system is producing over 2kW - 12A throws an error and stops charging. I've got a 3kW system so a bigger inverter may allow a higher draw but I haven't researched the specs. I assume if you set this up and didn't tie it to the grid it would just think the grid was down and allow you to use the plug while the sun was shining, and then you could use the same inverter when you do tie into the grid. I used mine like this after it was installed and before the utility gave me the OK to turn it on, as well as during a few outages since.Thanks for all of the replies. I should have said that I ultimately plan to get to a grid-tied system. Permitting is a PITA here in Maryland even though we claim to encourage green endevours. To make things worse, I live in a critical area near the Chesapeake Bay which adds yet another level of pain. For the capstone, I want to install the system myself (I'm a EE with many years of practical experience) and have gotten all kinds of reasons why I can't. My life and career have proven that part wrong so it's more of an irritant than anything else.
So in the meantime, I would like to start experimenting with the components as a learning exercise in a "temporary", grid-DISconnected configuration. I envisioned a minimal number of panels and an inverter. used along with the EVSE I already own (which I installed). I want provision for storage, however, I'm not sure when I would actually buy that part because it is still too expensive for me to justify. I am not pursuing this as a purely monetary exercise BTW so I don't care overly much about break-even times, fully charging the Bolt or any other reason why this would be ill-advised from a practical, long-term perspective.
FWIW, my solar array covers about what my two cars use. So I generally consider that as going to the cars, and none to the house. How you count it really doesn't matter in the end. You'd have to buy the electricity from the grid for the house and car without solar panels. With solar, you have to buy less or none at all.And indeed they are off -- my apologies. If I did all my charging at home, it'd be about 2 mWh/year - we don't put a lot of miles on the Bolt. So to make my claim of a solar powered car be correct, I will have to turn some lights of in the house...