Date: Sun, 2 Aug 2020 16:17:50 -0400
Reply-To: Harry Hoffman <hhoffman@IP-SOLUTIONS.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Harry Hoffman <hhoffman@IP-SOLUTIONS.NET>
Subject: Re: Project Farm Battery Test Battery offering!
In-Reply-To: <CY4PR0801MB373195A0A2F438BCAA46B9AAA04E0@CY4PR0801MB3731.namprd08.prod.outlook.com>
Content-Type: text/plain; charset="UTF-8"
Dennis,
There’s a guy (DIYvan) who does a similar setup for Ford Transits. I was
really interested but looking at Renogy”s 200Ah battery it weighs in at an
impressive 178 lbs (I believe).
That’s a whole other passenger in terms of weight. Compare that with a
LiFePO4 and there’s a huge difference in weight, longevity, and space. If
you DIY your own LiFEPO4 (Will Prose YouTube) and you’re down to a similar
cost.
I realize that’s way off from what you were asking so apologies for
meandering about in my email.
Cheers,
Harry
On Fri, Jul 31, 2020 at 7:01 PM Dennis Haynes <d23haynes57@hotmail.com>
wrote:
> Being experienced with batteries as I am there is also the issue of
> charging strategy, particularly the AGM batteries. They tend to operate and
> require different voltage current curves to truly strut their stuff and
> they deliver higher voltage after rest. Still some of this agrees with my
> experiences.
>
> Now for most of us this demo doesn’t offer much in the way of deep cycle
> performance or longevity. And many of use give much more thought to how
> much power can I carry for my fridge and heater than we care about
> starting.
>
> That said peace vans used to offer an under van drop down battery tray. I
> saw one on a customers van a few years ago and I just installed on a camper
> with a 200 A/H Battery. Is an awesome combination and in driveway testing
> van a Truck fridge easily for 4 days. Peace vans is no longer interested in
> supplying these and I'm told I just purchased their last 2. I plan to use
> one on Fun Bus.
>
> So here is the Friday question! Is there any interest in this type of set
> up? They did a very nice stamping and powder coating which made it somewhat
> expensive. I think I can fab of welded and painted plate. Or maybe aluminum
> or Stainless Steel. It fits in the frame space by the sliding door and sits
> at about the same height as the propane tank. If there is serious interest
> I work on some fabrication options.
>
> Dennis
>
> https://1drv.ms/u/s!AqaEiIhKCAKbke1Yte9HPxMXRM6JhQ?e=njDgwx
>
>
>
>
> -----Original Message-----
> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of David
> McNeely
> Sent: Friday, July 31, 2020 5:10 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Project Farm Battery Test
>
> Thank you David. I see that I edited poorly. Where I wrote "standard
> deviation," I should have written "standard error," once more. mcneely
>
> On Fri, Jul 31, 2020 at 2:00 PM David Boan <dboan@outlook.com> wrote:
>
> > What a refreshing response after seeing such a lack of critical
> > thinking on much of social media. Thank you.
> > ------------------------------
> > *From:* Vanagon Mailing List <vanagon@gerry.vanagon.com> on behalf of
> > David McNeely <davmcneely40@GMAIL.COM>
> > *Sent:* Friday, July 31, 2020 4:43 PM
> > *To:* vanagon@GERRY.VANAGON.COM <vanagon@GERRY.VANAGON.COM>
> > *Subject:* Re: Project Farm Battery Test
> >
> > Well ......... . Anyone who knows anything about experimental design
> > knows that this "experiment" is deeply flawed. Every time you measure
> > something, the value you get is an estimate. It takes a series of
> > measurements of each of a sample of items to give a mean value for
> > items of that type. One measurement is not a fair estimate.
> > Typically, in an experiment to compare two different sorts of things,
> > one wants a mean value from measuring some
> > 20 individuals of each sort. Then one can calculate a mean and
> > standard error. Roughly, a large overlap in standard error would then
> > suggest that the two sorts are no different from each other. No or a
> > small overlap in standard deviation would suggest that the two sorts
> > of things are different. It's a bit more complicated than that, but
> that's the idea.
> > Getting two different values from measuring one individual of each
> > sort like was done in this "experiment" might be within experimental
> error.
> > Next time the experiment is done, the values might be reversed between
> > the two sorts. Experimental design theory generally suggests that it
> > takes 20 individual measurements, one measurement of each of 20
> > individuals, to give a fair estimate of the true mean value.
> >
> > Bottom line: Based on this "experiment," I do not know that one of
> > the battery brands is better than another. In fact, if one Wal-Mart
> > battery were compared with one "identical" other Wal-Mart battery, the
> > same difference between the two as between the Wal-Mart and the
> > Autozone battery might show up.
> >
> > You can take all this for whatever you deem it to be worth, just as I
> > will take the "experiment" in the video for what I deem it to be worth.
> >
> > mcneely
> >
> > On Fri, Jul 31, 2020 at 10:56 AM Jack R <jack007@comcast.net> wrote:
> >
> > > Very educational.
> > >
> > > https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fww
> > > w.youtube.com%2Fwatch%3Fv%3Dh7rTcBanpMk&data=02%7C01%7C%7C9c7ed9
> > > bf114e4fad0f6608d83596416c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C
> > > 0%7C637318266747359489&sdata=ziJKttGyAwreOdMkkdIQWs8tFDg%2FlbL%2
> > > BdNCsM%2BbzEzk%3D&reserved=0
> > >
> > >
> > >
> > > Interesting independent test of batteries
> > >
> >
>
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