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EVDRIVER
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Re: 10 week hiatus every summer... charging strategy

Thu Mar 03, 2011 10:54 am

sparky wrote:If you have an SL, and it's parked in your garage, put a 100W flourescent light on a timer, above the LEAF solar panel. Run it for 4 hours/day; that should maintain your 12V battery (at least that's what the Solar Panel's supposed to do).

I have left my LEAF plugged in at 80% charge for just over 5 days. On the 5th day, at an unscheduled time (not 12am timer), my TED system recorded a few hundred Watts of power flowing to the LEAF. I now suspect this was an Aux battery and general housekeeping cycle.

That is not going to be effective at all and horribly inefficient.

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Re: 10 week hiatus every summer... charging strategy

Thu Mar 03, 2011 10:57 am

JasonT wrote:Until we've experienced something indicating otherwise I would not get any trickle charger for the 12v. Manual states that 12v battery gets a 5 minute charge every 5 days when the vehicle is not in use.

Additionally, the manual states that they recommend charging the car every three months with the 80% method if it's parked for a long time. So sounds like you could just leave it but if you wanted to be on the safe side you could carwings-charge it sometime in the half-way mark, or maybe carwings-charge it once a month.
It is better to use a trickle charger on the 12V battery, it will keep it from cycling via the DC/DC. It will not harm it, there is far too much thought going into this.

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garygid
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Re: 10 week hiatus every summer... charging strategy

Thu Mar 03, 2011 11:07 am

Trickle charge would raise the 12v system to ... almost 14 volts?

What voltage does the LEAF's DC-to-DC (12v nominal) system actually provide?

MAYBE the "12v" battery & system are designed to stay under 12.5 volts?
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wsbca
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Re: 10 week hiatus every summer... charging strategy

Thu Mar 03, 2011 11:12 am

DaveinOlyWA wrote:
plug it in, log into carwings once a week to boost charge it for an hour or so. try to maintain SOC at 50-60%
Oddly and annoyingly, with the iphone app you can 'start' charging but you can't stop it. I'm not in a position to confirm right now whether the same is true of the web portal interface but my vague recollection is that you can't do it there either - hopefully I'm wrong (or will be at some point in the future when they improve the software).

For the topic in this thread, once a week timer would work (or, as suggested, have a friend/relative drive it once a week or so and charge it up, I think that's what I'd do), but let's say you are at a location where you need some L2, but not a full charge (maybe the electricity is really expensive, or you just don't want to exceed 80% since you don't need to...or you just want to be polite and make it obvious that someone else can switch to their car since yours is no longer charging)...but you're not able to go back to the car to unplug it...you should be able to toggle the charger off with the phone.
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Re: 10 week hiatus every summer... charging strategy

Thu Mar 03, 2011 11:14 am

The OP says that Leaf will be parked in a driveway for an extended period of time.

If the car is equipped with a solar panel, the sun should be able to provide whatever trickle charge the solar panel is supposed to supply - if it really does do anything.

I'd guess the OP doesn't want to have the Leaf plugged in while it sits in the driveway for 10 weeks. I wouldn't.

Sounds like checking SOC with CarWings will work in this situation. If the SOC gets too low - maybe best to have a neighbor come over and plug in the car for long enough to get it charged back up. I'd guess that's what the OP is after - will the car last without being charged for 10 weeks, or should he be thinking about making arrangements to have someone come over and top it off.

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Re: 10 week hiatus every summer... charging strategy

Thu Mar 03, 2011 3:46 pm

EVDRIVER wrote:It is better to use a trickle charger on the 12V battery, it will keep it from cycling via the DC/DC. It will not harm it, there is far too much thought going into this.
Indeed, too much thought.... If it's in the driveway, charge it to 80% and leave it alone. I'd forget about the trickle charger; the solar panel is supposed to keep the Aux battery charged under these conditions. and per the User Guide : While the vehicle is not in use:
When the EV (Electric Vehicle) system is off, the 12-volt battery charges automatically for 5 minutes every 5 days.
So, you may come home and find 70% charge on your traction battery.

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Re: 10 week hiatus every summer... charging strategy

Thu Mar 03, 2011 5:19 pm

Dont put a trickle charger on the 12V battery, we dont know exactly what type of lead-acid battery it is.. probably not a normal starting type but an alarm type deep cycle.

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EVDRIVER
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Re: 10 week hiatus every summer... charging strategy

Thu Mar 03, 2011 5:28 pm

Herm wrote:Dont put a trickle charger on the 12V battery, we dont know exactly what type of lead-acid battery it is.. probably not a normal starting type but an alarm type deep cycle.

Its a normal car battery. And a PROPER charger like the ones I listed have a proper charge curve and then hold at the proper voltage. Everyone stop speculating, this is not complicated. Deep cycle 12V SLA and AMG batteries charge the same it's not a flooded battery for god sakes!

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Re: 10 week hiatus every summer... charging strategy

Thu Mar 03, 2011 5:30 pm

sparky wrote:
EVDRIVER wrote:It is better to use a trickle charger on the 12V battery, it will keep it from cycling via the DC/DC. It will not harm it, there is far too much thought going into this.
Indeed, too much thought.... If it's in the driveway, charge it to 80% and leave it alone. I'd forget about the trickle charger; the solar panel is supposed to keep the Aux battery charged under these conditions. and per the User Guide : While the vehicle is not in use:
When the EV (Electric Vehicle) system is off, the 12-volt battery charges automatically for 5 minutes every 5 days.
So, you may come home and find 70% charge on your traction battery.

Solar, indoors, if outside don't rely on the silly solar panel? If you store the car use a trick charger, a PROPER one, done. They have proper regulation. The Nissan folks were even doing this and you could even start the car up if you remove the 12V and apply one or two 9v batteries- EV 101 folks.

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Re: 10 week hiatus every summer... charging strategy

Thu Mar 03, 2011 5:33 pm

Guys - no need to worry about the 12V battery. The car tops it off once a week from the main battery when the car isn't turned on.
IMO - plug it in with it charged between 50-80%. Weekly monitor state of charge through carwings - if low (below 40%), give it an hour of charge or so or just charge it back up to 80%.

If you start out at 80% I doubt it will self-discharge down past 40% in 10 weeks.

Just don't store it with a 100% charge.

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