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How to charge a pure electric car at night using photovoltaic panels?
My photovoltaic panels (3KW) are off grid system, with 10 deep cycle batteries provide electricity at night.
I don't use aircond nor high power electric cooker. So 10 deep cycle batteries are enough to light up the energy saver light bulbs, some fans a TV and a laptop.
I tried to charge the electric car at night, than every light went blackout (except laptop, because it has its own battery of course). Disconnect the the cable from electric car, press the reset of the charge controller and the light came back.
What do I need to charge the electric car at night? So that I can proud to say that my electric car is zero carbon emission? I can't charge the electric car during day time because during day time I have to drive the car around town.
Look like I have to wait few more years to have enough saving to install more photovoltaic panels and more deep cycle batteries.
1 Answer
- campbelp2002Lv 76 years agoFavorite Answer
An electric car is a power hog. It probably uses more than most home central A/Cs.
The electric Nissan Leaf has a 24 kWh lithium ion battery. A 3 kW solar array could produce a little over 20 kWH on a perfectly clear day, if they are pointed due south at an angle equal to your latitude. Because charging a lithium ion battery is only about 80-90% efficient and charging a lead acid battery (which I assume your deep cycle batteries are) is only 50-95% efficient (obviously you need to research lead acid batteries to get the most efficient ones with such a large range of possibly efficiency), it would take about 33-60 kWH of solar power to fully charge it. So you would need more solar panels and I suspect a lot more deep cycle batteries. Of course you probably do not completely drain the battery on your car every day, so 20 kWH is probably enough for daily driving if you only make short trips, but it would leave zero left over for lights and TV and refrigerator.