Comments on: Some pictures of the battery

By: Borut

Borut — Mon, 21 Mar 2016 07:34:20 +0000

I have notes another interesting thing the other day.
I stop on a motorway charging station without taking a charge ,just stop for 10 minutes .
When I arrive, the soc was 31% but 10 minutes later the soc was 34%,without charging.
Why?
It looks that the battery computer measure capacity with voltage and not only energy in-energy out.
If this is the case then a small sollar pannel would not be a problem if connected directly to the battery.(with overvoltage cuttoff)

By: Jeroen Meijer

Jeroen Meijer — Sat, 19 Mar 2016 19:26:43 +0000

In reply to borut. Exactly! So unless the goal is to be able to "escape from a charging disaster at all times (albeit of LONG duration!), a wiser approach might be to fill rooftops, meadows, office and factory roofs to the brim with solar panes and, for now, accept the losses of the DC-AC-DC conversion. Personally, I do expect to see deeper integrated inverters on the commodity market within 5 years, meaning cleverly balancing PV, grid, car (through CCS and yes, using your contactor trick) and home storage systems.

By: borut

borut — Sat, 19 Mar 2016 19:21:45 +0000

And you would have to do a pretty good job installing pannels not to spoil aerodinamic of the car,it is pretty horrible as it is.

By: Jeroen Meijer

Jeroen Meijer — Sat, 19 Mar 2016 18:47:09 +0000

In reply to Borut.

Someone would have to reverse-engineer the Electro Canbus. I am pretty sure I located the connector, will make a main post of that tonight. As for doing the actual frames reverse engineering……..

I don’t think there is a need for all the ECU’s to stay on. I would have to check in the car which frames are send during charging and then work backwards which ECU’s do send that data. If the instrument panel is on though, all ECU’s fire up.

Apart from that, I’d venture to say you’d probably max out on 300 Watt for a PV rooftop. Assuming 15 kWh/100km you’re looking at 1kWh (=6km) per 3 hours, so a charging equivalent of 2km/h in bright sun, so maybe 10 kilometers per day, on a good day? Here we say: all little bits help……… a little!

By: Borut

Borut — Sat, 19 Mar 2016 18:16:46 +0000

for charging while driving it is not a problem, from whole roof of sollar pannels there would be 200 to 300 W of power so cheap modified 12 or 24 to 230 V conver will do the job but when pareked ,if you want to charge the main battery the car has to be on , if the car is on ,the computers drain 300 W continuosly so no net gain :(.
So it would be nice if someone finds out what command to send throu canZE to switch off the car but leave main battery contactor on.
There is another way.
if you change 12 V battery for 100AH 4s li-ion type and charge that battery with sollar to 16 V when the car is parked then the battery will have higher voltage and the dc dc converter will not charge it until the voltage drops to 13.2 V .
You can save 1 kwh of power in 3 hours of driving 🙂 wich would be used for computers, fans, lights…
I have tryed 16 volts on my zoe for short, time it works fine.:)

By: Bob Fisch

Bob Fisch — Sat, 19 Mar 2016 17:51:41 +0000

In reply to Borut. No idea, but this is something I'm very interested in too!!

By: Borut

Borut — Sat, 19 Mar 2016 17:48:44 +0000

I ‘m playing with idea of putting some flexible sollar pannels on the roof of my Zoe.
Is it possible to turn on main battery contactor an leave all other computers on sleep ?

By: borut

borut — Sat, 13 Feb 2016 15:50:16 +0000

In reply to Jeroen Meijer. How would you implement the required connection .?

By: Jeroen Meijer

Jeroen Meijer — Sat, 13 Feb 2016 15:34:50 +0000

In reply to borut.

See page 4 on their technical document http://www.eptender.com/SiteAssets/EEVC%20paper%20EP%20Tender%20-%20Nomadic%20Power.pdf (splice the Battery BCB cable). A horrificly bad idea, but that is my opinion.

By: borut

borut — Sat, 13 Feb 2016 14:29:27 +0000

Hello
Does anyone have knowledge about how is ep tender http://www.eptender.com/ electricly connected to Zoe ?