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Discussion Starter #1
I am getting to the next design phase of my car. I am changing the voltage from 120V of SLA batteries to 96V of flooded. The SLA are still good, but I need more range than what they give. So I have a thought to buy some solar panels to keep the SLA batteries charged, and then run the battery charger off an inverter to charge my car. This way, I hope to be able to reduce the electric bill slightly. Does this sound feasible? I don't think the solar panels, which will be mounted on my house, will completely supply enough power, but some. So if this idea works, would I need to get a pure sine inverter to run the charger? Or is a modified sine inverter sufficient? The modified are much less expensive, so that would be nice. But I don't want to destroy the charger. Any thoughts?

Thanks,
Brian
---- Msg sent via @=WebMail - http://webmail.usu.edu/

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Discussion Starter #2
why go to all the work and expense and electronic
losses of adding an inverter/charger loop when you can
go directly from the solar panels to the batteries??

--- "[email protected]" <[email protected]> wrote:

> I am getting to the next design phase of my car. I
> am changing the voltage from 120V of SLA batteries
> to 96V of flooded. The SLA are still good, but I
> need more range than what they give. So I have a
> thought to buy some solar panels to keep the SLA
> batteries charged, and then run the battery charger
> off an inverter to charge my car. This way, I hope
> to be able to reduce the electric bill slightly.
> Does this sound feasible? I don't think the solar
> panels, which will be mounted on my house, will
> completely supply enough power, but some. So if
> this idea works, would I need to get a pure sine
> inverter to run the charger? Or is a modified sine
> inverter sufficient? The modified are much less
> expensive, so that would be nice. But I don't want
> to destroy the charger. Any thoughts?
>
> Thanks,
> Brian
> ---- Msg sent via @=WebMail -
> http://webmail.usu.edu/
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>




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Discussion Starter #3
Regulation. If you directly tie the batteries to the panels you could
overcharge them. There has to be some kind of governer in the system to
keep the panels from ruining the batteries.

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of keith vansickle
Sent: Wednesday, August 22, 2007 10:47
To: [email protected]; Electric Vehicle Discussion List
Subject: Re: [EVDL] input to battery chargers

why go to all the work and expense and electronic losses of adding an
inverter/charger loop when you can go directly from the solar panels to
the batteries??

--- "[email protected]" <[email protected]> wrote:

> I am getting to the next design phase of my car. I am changing the
> voltage from 120V of SLA batteries to 96V of flooded. The SLA are
> still good, but I need more range than what they give. So I have a
> thought to buy some solar panels to keep the SLA batteries charged,
> and then run the battery charger off an inverter to charge my car.
> This way, I hope to be able to reduce the electric bill slightly.
> Does this sound feasible? I don't think the solar panels, which will
> be mounted on my house, will completely supply enough power, but some.

> So if this idea works, would I need to get a pure sine inverter to run

> the charger? Or is a modified sine inverter sufficient? The modified

> are much less expensive, so that would be nice. But I don't want to
> destroy the charger. Any thoughts?
>
> Thanks,
> Brian
> ---- Msg sent via @=WebMail -
> http://webmail.usu.edu/
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>




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Discussion Starter #4
Not really an issue.... with the size of a PV system you could
actually fit on a car, and the amount of overcharging that EV
batteries are intentionallly subjected too all the time... I doubt the
200 watt PV system could do any damage. For a home PV system, we are
often putting 1kW or more of PV on roughly the same amount of
batteries as are in most EV's, and then cycling them very shallowly
most the time -- and then control is necessary. But coming from the
PV industry, I am shocked at how abusive EV's are to batteries, both
discharging and charging them.

Of course, you can just put a charge controller on there and it
becomes a complete non issue. You'd probably have to break it into 48
volt substrings, as this is the highest voltage commonly available
charge controller though.

On 8/22/07, Dewey, Jody R ATC COMNAVAIRLANT, N422G5G
<[email protected]> wrote:
> Regulation. If you directly tie the batteries to the panels you could
> overcharge them. There has to be some kind of governer in the system to
> keep the panels from ruining the batteries.
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf Of keith vansickle
> Sent: Wednesday, August 22, 2007 10:47
> To: [email protected]; Electric Vehicle Discussion List
> Subject: Re: [EVDL] input to battery chargers
>
> why go to all the work and expense and electronic losses of adding an
> inverter/charger loop when you can go directly from the solar panels to
> the batteries??
>
> --- "[email protected]" <[email protected]> wrote:
>
> > I am getting to the next design phase of my car. I am changing the
> > voltage from 120V of SLA batteries to 96V of flooded. The SLA are
> > still good, but I need more range than what they give. So I have a
> > thought to buy some solar panels to keep the SLA batteries charged,
> > and then run the battery charger off an inverter to charge my car.
> > This way, I hope to be able to reduce the electric bill slightly.
> > Does this sound feasible? I don't think the solar panels, which will
> > be mounted on my house, will completely supply enough power, but some.
>
> > So if this idea works, would I need to get a pure sine inverter to run
>
> > the charger? Or is a modified sine inverter sufficient? The modified
>
> > are much less expensive, so that would be nice. But I don't want to
> > destroy the charger. Any thoughts?
> >
> > Thanks,
> > Brian
> > ---- Msg sent via @=WebMail -
> > http://webmail.usu.edu/
> >
> > _______________________________________________
> > For subscription options, see
> > http://lists.sjsu.edu/mailman/listinfo/ev
> >
>
>
>
>
> ________________________________________________________________________
> ____________Ready for the edge of your seat?
> Check out tonight's top picks on Yahoo! TV.
> http://tv.yahoo.com/
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #6
[EVDL] Input to battery chargers

I live in Pullman, WA, where we have an abundance of sunlight. I just
finished converting a VW Cabriolet, using a 96-volt pack of flooded
US-125's.

Earlier, I bought four 12-volt Kyocera 130 watt solar panels (KC-130TM) with
the same idea as you have. I also bought a 48-volt Xantrex solar charge
controller (C-40), which are easily found on the Internet for around $150.
The panels are expensive, but the charge controller is not.

I'm fortunate that our electrical cost is a modest $.05/kwh. Our utility has
a "net-metering" program, whereby they will buy back power that I generate
at a rate that depends upon the equipment used. It can vary at a low end of
$.12/kwh to a high of over $.50/kwh.

All of a sudden I got a "flash of smart" and realized that it is much better
to SELL the solar power generated at, say $.24kwh, and plug my car into the
outlet and BUY power at $.05kwh! Not only that, but I'd be utilizing my
solar investment 100% of the available solar charge time, (i.e., sunlight)
rather than just when my car batteries need charging.

There is a down-side to this scheme, however, and it is COST. Net-metering
requires much more than a $150 charge controller. Depending on how skillful
you are in buying parts right and how much of the electrical wiring you can
do, it will probably cost an additional $2,000 over the cost of the solar
panels. And if that doesn't deter you ... you'll probably need at least ten
to fifteen panels (at around $600 ea) to make a worthwhile net-metering
system. (See the Solar Energy International web site for good info on this
subject: www.solarenergy.org )

Me: My four panels are still in the barn awaiting my checkbook to swell up
enough to pop for the additional expense. In the meantime, rather than let
the panels sit idle, I'll soon hook up the four panels to my charge
controller and charge my floodies, half a pack at a time. Something is
better than nothing!

Good luck and drop me a line if you get bored.

Roger Daisley
Pullman, WA
http://www.96-volt.com


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Discussion Starter #7
Re: [EVDL] Input to battery chargers

A few tidbits that might help:

http://www.dsireusa.org/library/includes/map2.cfm?state=WA&currentpageid=1

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