Date:         Mon, 15 Oct 2018 20:53:29 -0600
Reply-To:     Steve Williams <steve@WILLIAMSITCONSULTING.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Steve Williams <steve@WILLIAMSITCONSULTING.COM>
Subject:      Re: Lead Acid Battery Bank and Solar Charging
Comments: To: Steven Johnson <sjohnso2000@gmail.com>
In-Reply-To:  <CAGXJJtwbW-4mcFOR=_95vS9CFEgrCKSVXE=HXHGeXCrU2gFDgg@mail.gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed

Hi,

40 amp hour/battery x 10 batteries = 400 AH.

Divide by 2 (50% discharge) = 200 AH available.

100w panel will put out (approx) 7 amps @ 13 VDC. (charging voltage will
vary depending on the stage... a good charge controller has at least 3
stages).

200 AH draw down in the batteries divided by 7 amps that the solar panel
can generate = 28 hours of full strength sunlight with no additional
discharge in order to bring the battery bank fully up.

I don't know what the load is on the batteries, but this isn't balanced
very well.

This is back of the napkin math, but it is in the ballpark.

Cheers,
Steve W.

On 15/10/2018 1:08 PM, Steven Johnson wrote:
> Well, I'm guessing 30 - 40 amp hours each battery.
>
> Does that help?
>
> Thanks,
>
> Steven
>
> On Mon, Oct 15, 2018 at 11:40 AM Steve Williams
> <steve@williamsitconsulting.com
> <mailto:steve@williamsitconsulting.com>> wrote:
>
>     What's the total amp hours of the batteries?
>
>     On 15/10/2018 11:54 AM, Steven Johnson wrote:
>     > Hi All,
>     >
>     > I have a bank of 10 lead acid batteries that I would like to
>     maintain with
>     > 100 watt solar panel.
>     >
>     > What configuration should I use?   What charge controller/monitor?
>     >
>     > Any help appreciated.
>     >
>     > Thanks!
>     >
>     > Steven
>     > 91 Westy
>