[PSUBS-MAILIST] battery pod

[Alec Smyth via Personal_Submersibles]

Hi Rick,

I did pretty much the same thing, with aluminum battery trays that slide in
and out. It was a very snug fit, but here's the thing... I did find that
even in the same battery group size and with the same published dimensions,
some brands of battery are taller than others. I used Duracell AGM
batteries, which besides having a good price were also among the shortest I
could find.

Best,
Alec

On Tue, Mar 30, 2021 at 9:02 AM Sean T. Stevenson via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

> A photo of the problem would be helpful. My immediate thought is whether
> the interference can be eliminated by rotating the battery stack in the
> tube? Perhaps just for removal / replacement, if the interfering fitting
> can ultimately land in a gap between batteries?
>
> Sean
>
>
>
> -------- Original Message --------
> On Mar. 29, 2021, 22:19, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Well I just got blindsided by my first, what I would call major problem,
> since I started this project which I guess is pretty good but it might be a
> major one. On any project, you tend to look forward the best you can when
> you fabricate something to make sure you are not painting yourself into a
> corner but this one may have got me I think.
>
> My battery pod design is a little different than what's on the plans. I
> attach the end caps a little differently but I also take the power into the
> sub a little differently as well. I wanted to be able to remove the
> batteries when needed without a lot of trouble though the end caps will
> usually always stay on. I built an aluminum tray for each side that all 4
> batteries fit into end to end and that tray slides along two pieces of SS
> angle welded into the inside. One leg goes up and the other leg points
> inward at each other.
>
> After building the aluminum trays using 1/4" flat bar, I snuggled the SS
> angle to both sides of the tray adding a little slop to it so they wouldn't
> be too snug and bind then put them inside the pipe and went down until the
> SS angles touched the inside of the pipe and tack welded the SS angles in
> place plumb and true. Before doing all this, I made a plywood template of
> it to confirm that I would have the clearance I needed based on using the
> 12 volt wet cell battery the plans call for.
>
> Even with the thickness of the SS tracks and aluminum trays, I had a
> comfortable clearance for passing my sealing ring. Well,,,I found out that
> with the batteries in the tray, they will not slide under/past the copper
> all thread that comes in at the 32 degree angle from the hull and I cut
> those about as short as I could to be able to get the 2 nuts on them with a
> lug. From what little I understand about wet cell batteries, I guess they
> come in different classes based on certain things so I don't think I can
> just go get ones that are a little shorter. I am all ears guys! I have had
> usually non P subbers ask me why I didn't use new state of the art lithium
> batteries or golf cart batteries but I am limited on space and
> dimensions and also a lot of thought went into trimming the boat out using
> that particular battery.
>
> Rick
>
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