Transportation > Electric Vehicles

Charging EV with solar

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lighthunter:
Hi guys!  Thanks for your ideas and comments! I have been busy with planting sweet corn among other things. I love spring but it doesnt last long  :)

"My Goodness, I didn't know those cars used such a high voltage."

Yeah, neither did I  :o the oem pack is NiMh 28 7.2v modules for 201v nominal. Then it goes to a boost converter, the software controls the boost in a varying amount depending on load up to 500v to an inverter that passes the power to a 50kw 3 ph perm magnet motor that can spin several thousand rpm. The battery doesnt supply all the dc power though, over half comes from a 30kw generator spun by the gas engine. Heres a photo of the battery voltages in blocks of two. One screenshot is during braking, (neg current) and another during accel (pos current)

lighthunter:
LFP can easily do a better job than these nimh batteries though but im not planning on replacing the oem pack, im just gonna use the LFP bank to give a steady supply of current into the 200v buss which will cause the ecu to use more electric assist than gas. You can use all electric but top speed is only 41 mph due to the max rpm of the pmg.

"When you say 75 series, do you mean 75ah? How many cells?"

I mean qty (75)  3.2v 40AH cells. This way i can use a simple bank of FETs with pwm to feed a steady current into the 200v buss. The higher voltage eliminates the need for a boost conversion to charge.

I agree with you guys regarding  not partnering with utility. Its just that it would be nice to bank power into grid and get it back at a time when you need it. No battery could match that if the trade was one for one. Yet i know the utility wont trade one for one anymore. Much of the US has passed state legislation allowing utilities to charge whatever they feel is (reasonable) for grid usage. I also couldnt agree more S/N about the fets and grid ties. Pushing all your power into grid means keeping a grid tie inverter working to do all that which equals failure at some point and high replacement cost. On the other hand the LFP charging can be done efficiently by simply choosing the correct number of panels and direct connecting to LFP string with bms monitor and HV cutoff of course.

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