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 Post subject: Storage / Long Term Parking
PostPosted: Sun Apr 14, 2013 9:22 am 
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Joined: Wed Nov 14, 2012 9:50 pm
Posts: 4072
Location: San Diego
I left my car for about three weeks, and it had the same 61 miles on it when I got back.

I left the car unplugged, but the 12 volt lead acid was on a tender / trickle charger plugged into 120v.

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Tony Williams
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 Post subject: Re: Storage / Long Term Parking
PostPosted: Sun May 19, 2013 12:00 am 
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Joined: Sun Jan 20, 2013 9:34 pm
Posts: 62
I'm planning on parking my Rav4 EV for a week @ the airport... so no way to keep it plugged in.

While I'm encouraged that others have not had the dreaded "dead 12V battery" problem for such a duration, I was hoping someone might chime in about trickle charging.

I guess TonyWilliams had a trickle charger attached directly to the 12V battery. I won't have that option obviously.

But what if I could obtain, say, a small solar panel and leave it on the dash plugged into the 12V "cigarette lighter"... I recall somewhere somebody saying that would do it.

Thoughts?


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 Post subject: Re: Storage / Long Term Parking
PostPosted: Sun May 19, 2013 12:51 am 
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Joined: Fri Mar 01, 2013 10:01 pm
Posts: 189
Location: Long Beach, CA
Power to the cigarette lighter is cut off when the car is turned off so that would not work.

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 Post subject: Re: Storage / Long Term Parking
PostPosted: Sun May 19, 2013 1:13 am 
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Joined: Thu Jan 17, 2013 11:13 pm
Posts: 1788
Location: Los Altos, CA
You could probably make an adapter to plug into the fuse panel and provide a lighter socket so you could use the solar panel. My quick scan of the manual shows Fuse #21 (Stop Lights) or Fuse #22 (Charge Indicator) would probably have constant +12V under the dashboard.

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 Post subject: Re: Storage / Long Term Parking
PostPosted: Sun May 19, 2013 7:09 am 
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Joined: Wed Nov 14, 2012 9:50 pm
Posts: 4072
Location: San Diego
I think I would just run two conductors to the battery with the appropriate inline fuse. Make sure it has a diode to prevent discharging the 12v battery through the solar panel at night when it's dark.

Just leave it on the dash while parked at the airport.

This looks like a really good one:

http://www.batterymart.com/p-12v-15w-ba ... arger.html

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Tony Williams
QC Charge
1780-104 La Costa Meadows Drive
San Marcos, California 92078 USA
tony@QCcharge.com
www.QCcharge.com
Twitter: QCPower
1-844-EV-PARTS
1-844-387-2787
1-760-798-0342 Office
Hours M-F, 9-5 Pacific Time


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 Post subject: Re: Storage / Long Term Parking
PostPosted: Mon May 20, 2013 4:17 am 
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Joined: Thu Apr 04, 2013 4:21 pm
Posts: 27
Location: Redondo Beach, CA
I left mine in the driveway for 10 days while I was away on vacation and learned the hard way that the cig adapter is unpowered while the car is off (otherwise my solar charger would have prevented me from finding a dead 12v battery on my return). I'll have to look into running some wires from the fuse box next time as well since the solar panels have battery clips but are only rated for interior usage.

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 Post subject: Re: Storage / Long Term Parking
PostPosted: Mon May 20, 2013 5:56 am 
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Joined: Wed Nov 14, 2012 9:50 pm
Posts: 4072
Location: San Diego
I killed the 12v today the old fashioned way... I left the car on. I think this is my first time in 50,000 total EV miles. Naturally, the car didn't charge either, since the car was left on READY.

Honestly, the horn should blow if the car is plugged in while the car is in READY (or powered ON or ACC).

The funny thing is that it didn't drain the traction battery. In other words, the 12v was not getting charged, even though power was available to do so.

I jump started it today, and pushed the POWER button to OFF as the car came to life. Naturally, the clock set to default 12:00 and eastern time zone (even though the car isn't even sold there).

I lost all the radio presets, of course, and all the charge timers. The address book remained, thankfully.

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Tony Williams
QC Charge
1780-104 La Costa Meadows Drive
San Marcos, California 92078 USA
tony@QCcharge.com
www.QCcharge.com
Twitter: QCPower
1-844-EV-PARTS
1-844-387-2787
1-760-798-0342 Office
Hours M-F, 9-5 Pacific Time


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 Post subject: Re: Storage / Long Term Parking
PostPosted: Mon May 20, 2013 6:00 am 
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Joined: Thu Jan 17, 2013 11:13 pm
Posts: 1788
Location: Los Altos, CA
It seems silly to me that the car can't detect that the 12V battery is getting low and turn on the DC/DC charger while an EVSE is connected. It doesn't have to start charging the traction battery, just pull enough from the EVSE to charge the 12V battery.

Edit: Now that I re-read what I said above, I guess it's not really possible to pull energy from the EVSE without charging the battery. That's the only path the energy can take - through the on-board charger into the traction battery. The DC/DC converter is taking energy from the traction battery to power the 12V accessories and charge the 12V battery. I don't know if the on-board charger can dial down the current low enough to run the DC/DC converter and not do a significant charge.

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 Post subject: Re: Storage / Long Term Parking
PostPosted: Mon May 20, 2013 9:54 am 
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Joined: Sun Jan 20, 2013 9:34 pm
Posts: 62
yblaser wrote:
Power to the cigarette lighter is cut off when the car is turned off so that would not work.


This is, unfortunately, true of all three of the "cigarette lighter" 12V receptacles (one in the dash, another in the center console, a third just inside the rear door). Disappointing...

Wonder of wonders, however, the USB jack on the outside of the center console is always hot.

Of course this is probably just spec'd with USB-2 power... meaning something like only 2.5W at 5V. USB-3 would be only a bit more at 4.5W.

So the two questions would be:
1) How much wattage would be needed to keep the 12V battery charged?
2) Given the 5V regulation on the USB receptable's power, can the 12V battery get charge through this port?


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 Post subject: Re: Storage / Long Term Parking
PostPosted: Mon May 20, 2013 3:12 pm 
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Joined: Sat Feb 23, 2013 2:43 am
Posts: 114
Location: Tustin
What about disconnecting the 12v terminal for 2-3 weeks? Would this suffice? What's the 12v battery self discharge rate when unconnected?

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