[RE-wrenches] Battery bank calculator

[Dave]

The AEE catalog battery sizing template works well as it allows you to dial back the days of autonomy needed. As I remember the old Dankoff Solar battery sizing method pushed the watt hour size of battery banks to large, and expensive, levels.

 

The collective experience of this group, and others, has emphasized designing off grid pv system's where the primary consideration is ample PV array sizing and where the storage battery is sized in the C/10 range. With lower module prices this has been practical for a few years now and it has been demonstrated that smaller watt hour battery banks have proven to be not only cost savers but also perform well for years as they live in a system where they are very likely to be fully charged on a regular basis.

 

Even here in northern Vermont where we experience late fall and winter daily peak sun hours in the 1 hr/day average range, designing large battery banks has been frowned on for many years out of my shop. Oversize the pv array and run the generator when needed.

 

David Palumbo 

Independent Power LLC

462 Solar Way Drive

Hyde Park, VT 05655

802-371-8678 cell

 

 

 

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Chris Mason
Sent: Tuesday, September 15, 2015 5:39 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Battery bank calculator

 

Homer can do it but it is expensive.
http://www.homerenergy.com

On Sep 15, 2015 9:31 AM, "RE Ellison" <reellison at gmail.com> wrote:

I don't think it can be done accurately with a sizing tool i've actually never heard of a tool at least not that I can remember

There's far too many variables.
Everything from loads to solar isolation as well as the habits of the individual occupants and the appliance selection in the home

The old joke used to be calculate what you needed for three days and then double it as far as battery bank size

Just a few thoughts, batten five dollars will get your cuppa coffee and a lot of convenient stores

Bob Ellison



> On Sep 15, 2015, at 9:21 AM, gary easton <gary at arp-solar.com> wrote:
>
> anyone have a suggestion for a battery bank sizing tool?
>
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