I was going to use a simple 12v inverter to 120 VAC and then 2 diode, 2 capacitor voltage doulbler to 330 VDC at 600 mA or so max, straight to the Volt battery. No activation of Volt's BMS. Safety is provided by a pushbuton activation latch that can only be turned on when I know there is room in the battery for 4 miles or more and sun is shining. When the sun goes down, the latch falls out and any subsequent days, will not activate unless I push the button when there is the 4 miles range available at the top. So all I need to find is the tap point directly to the battery before the contactors. Fuses and diodes will also be used.
Bob On Mon, Feb 17, 2020 at 3:37 AM Ing. Marco Gaxiola <[email protected]> wrote: > Hey Rob.. > > Hopefully you recover quickly and ready for that EV project. > > With regards using the 240W solar to charge the HV battery; that may not > be that easy if you want to do that Straight DC to DC: > > - First you will need to have an efficient DC-DC step-up converter from > 20-40Vdc into something around 300-400Vdc with MPPT feature. (Not easy to > get). > > - Then the most complicated part you’ll have to wake certain modules up > from the Volt (BCM, HV charger, BMS and maybe a few other) so it can > properly track the energy being generated by your solar panel. > > But that won’t be easy. In fact, it will be quite complex since all > these modules requires to see the AC power from the EVSE, sense the pilot > and proximity signals in order to close HV contactors. And those conditions > may not exist or if they do, may set Trouble codes since no AC will be > present. > > > An idea just came to my mind, very very basic but efective suggestion > would be: to build a box with a considerable size 12.8V LiFePO4 battery, an > ‘Off the shelf’ solar charger controller and a 1.5Kw 12v-120v AC inverter > to generate Level1 enough to use the Volt onboard charger. > > An internal automatic inter connection in between the inlet charge > port can be made, so nothing can be seen from outside while charging from > solar. > > The solar panel will continuously charge the 12.8V lithium pack all > the times. When enough charge and vehicle is turned off, it can start L1 > charging the car. When the charge on that lithium battery goes low, the > charge controller will automatically cut off the output but the solar will > continue to charge the battery to a minimum set point, after some > minutes/half hr. output will re-enable and L1 charge re-start for a few > minutes again. > > This process can go over and over as long there is sun and car > requires the charge. It’s not the best and most efficient way but will work > with no problem. > > > Marco > > > Sent from my iPhone > > > On Feb 16, 2020, at 11:29 PM, Robert Bruninga via EV <[email protected]> > wrote: > > > > When I recover in a few months, you can see my ideas for flattening the > roof > > and adding 240W of solar panels to my Volt in a Back-to-the-future > design > > on this web page. Also adding a bed for a Volt-Inn. > > > > I know it makes no practical economic sense, but makes it a real > eye-catcher > > and conversation starter. > > > > Now all I have to figure out is where I can feed in the 300 VDC for > charging > > the HV battery... > > > > http://aprs.org/my-EVs.html > > > > Bob > > _______________________________________________ > > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > > ARCHIVE: http://www.evdl.org/archive/index.html > > INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200217/64b8f209/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
