Nowty Towers DIY Battery Project

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nowty
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Re: Nowty Towers DIY Battery Project

#11

Post by nowty »

The cell dimensions for the 280Ah, 304Ah and the 314Ah variants are pretty much the same and for different manufacturers, maybe a 1mm or two of difference.

For the cells I have bought they are 71mm (thick) x 207mm (tall) x 173mm (wide), they are going to be in my Battery Cave and it is height limited so I cannot have them the right way up very easily. They will be laying horizontally on their short sides and be two cells high. Horizontally they will be separated by 0.5mm Epoxy resin separators between each cells. These thin separators are bought from Aliexpress and are already cut to the correct size for these cells, they are delivered in about a week.
https://www.aliexpress.com/item/1005007 ... 1802I16RVC

Vertically I will use 5mm hardwood plywood from B&Q, I will also use the same plywood glued onto the steel plates at each end.

I have calculated that a 400mm x 200mm x 3mm steel plate is large enough to accommodate 2 cells high (2 x 173mm) plus 5mm of plywood plus clearance for the threaded bars. And for extra extra strength I am also using 30 x 30 (3mm thick) angle iron, these will be 430mm long so the bottom will hang down below the bottom of the steel plate which will sit on the deckboard base.

Several places on ebay sell 400mm x 200mm x 3m steel plate, and some also cut them to other sizes if you ask them. So if you need the cells to stand upright, or you only want a single deck, you will have to do some simple maths.


Step 1
The steel plate arrived quite dirty so a quick clean with a general cleaner was beneficial. I marked them with numbers and which is the inside and outside. This is important so when you drill the angle irons, everything will still line up correctly. The steel plate came from here,
https://www.ebay.co.uk/itm/163890257304
Image


Step 2
I bought the angle iron from Wickes, 30mm x 30mm, 3mm thick and 1 metre long. I needed 2 of them and cut them 430mm long with a jigsaw. I then drill them first with a pilot drill, then a 8.5mm clearance hole for the threaded bar. I use a centre punch to mark the holes 15mm from each end and 15mm in from the outer edges, it only needs to be roughly accurate but the angle iron needs to be marked up so you can match each one with the correct face of the correct steel plate end.
Image


Step 3
You should end up with the steel plates and the angle irons drilled with all the holes for the threaded bars lining up. The reason why the angle irons are longer is so that they sit either side of the deckboard base and the lower threaded bars (with covering) will be below the base of the battery cells.
Image


Step 4
Cut the 5mm plywood to the same 400mm x 200mm as the steel plates and glue them onto the inner surfaces of the steel plates with a glue of your choice. I used gorilla glue, once the glue is set, drill through the upper holes in the steel plate so the wood is also drilled for the threaded bars.
Image

More to follow ..........................
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Stinsy
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Re: Nowty Towers DIY Battery Project

#12

Post by Stinsy »

Are you putting polycarbonate sheets between the cells?
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Moxi
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Re: Nowty Towers DIY Battery Project

#13

Post by Moxi »

Stinsy wrote: Tue Mar 11, 2025 6:14 am Are you putting polycarbonate sheets between the cells?
They will be laying horizontally on their short sides and be two cells high. Horizontally they will be separated by 0.5mm Epoxy resin separators between each cells. These thin separators are bought from Aliexpress and are already cut to the correct size for these cells, they are delivered in about a week.
https://www.aliexpress.com/item/1005007 ... 1802I16RVC

Was that what you meant Stinsy or di you mean on a different side to what I am thinking ? Had to edit because I pressed post because the kids distracted me - sorry

I wondered what the compressive strength of polycarbonate sheets was?

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nowty
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Re: Nowty Towers DIY Battery Project

#14

Post by nowty »

Epoxy resin sheets, general info on them here,
https://www.jhd-material.com/knowledge/ ... ery-packs-

Image


PS - I've had a delivery. :twisted:
Image
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Re: Nowty Towers DIY Battery Project

#15

Post by Stinsy »

How is your back?
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nowty
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Re: Nowty Towers DIY Battery Project

#16

Post by nowty »

Stinsy wrote: Tue Mar 11, 2025 12:29 pmHow is your back?
When you posted not too bad but its been a long day, now in operational service of sorts. :twisted:

But now I need to dismantle, cut another 1cm off the mid deck plywood and rebuild in the battery cave, I think I'll leave that till tomorrow. :xx:


Nice cells well packed and they make a sloshing sound when you shake them. :shock:
Image


As expected, I need to cut down the threaded bar, coverings and the mid deck plywood to fit the cells. :oO:
Image


Thats better but maybe I need to cut more off. :?:
Image


Yes definitely need to cut more off, I've lost all the slack before I get the required tension on. :facepalm:
Image


Well lets just crack on for a test, excellent my 4 cell wide busbars from Aliexpress actually fit with plenty of movement. :mrgreen:
Image


Nuts are on only hand tight for now, pack home battery voltage is almost the same as the new stack so go for it, I never thought I'd find a use for those jump leads. :lol:
Image


Other new info,

Threaded bar is 8mm from TLC, for my cells final cut is 138 cm long, M8 nut and M8 penny washer.
https://www.tlc-direct.co.uk/Products/UVTR2.html

Threaded bar covering is a 15mm (OD) plastic barrier central heating pipe from Wickes, for my cells, the final cut was 115cm long.
https://www.wickes.co.uk/Hep2O-HXX03-15 ... m/p/149192

Springs are extra heavy duty 64mm long from here,
https://www.cromwell.co.uk/shop/fastene ... s/c/231108

Mid deck 5mm hardwood plywood separator from B&Q, final cut for my cells is 115cm x 21cm.
https://www.diy.com/departments/hardwoo ... 372_BQ.prd

Epoxy Resin Battery Separators, 30 sheets needed for my 32 cell configuration.
https://www.aliexpress.com/item/1005007074544625.html

4 Cell wide Busbars, makes it easier for a 32 cell configuration. Other busbars and nuts came included with the cells.
https://www.aliexpress.com/item/1005004920366631.html
Last edited by nowty on Wed Mar 12, 2025 11:46 am, edited 1 time in total.
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Ripple 6.6kW Wind + 4.5kW PV > 33MWh generated
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Re: Nowty Towers DIY Battery Project

#17

Post by Joeboy »

Looks tidy. Liking the 4 cell bb's.
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nowty
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Re: Nowty Towers DIY Battery Project

#18

Post by nowty »

Battery pack dismantled for transfer to the battery cave.

I've ranked them in order of marked capacity which ranges from 297.021Ah to 299.727Ah, each is a nominal 280Ah cell.
Image


Because I am making a 32 cell pack using parallel pairs of 16 in series I need the sum of each parallel pair to be as close to each other in capacity. So I am going to pick the highest and lowest capacity cell for the first pair. Then I repeat until I've paired them all up, the last two being the two in the middle.

So the first pair will be 297.021 + 299.727 = 596.748Ah

The last pair will be 298.623 + 298.092 = 596.715Ah

Close enough for government work. :xx:
Last edited by nowty on Wed Mar 12, 2025 9:01 pm, edited 1 time in total.
18.7kW PV > 110MWh generated
Ripple 6.6kW Wind + 4.5kW PV > 33MWh generated
7 Other RE Coop's
105kWh EV storage
90kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 530 m3
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nowty
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Re: Nowty Towers DIY Battery Project

#19

Post by nowty »

The 1 hour saving session went in a blink of an eye whilst I was moving batteries into the battery cave by torchlight. :xx:

But I'm now in pain, cell tensioning will have to wait till tomorrow. :facepalm:

No pain, no gain. :twisted:
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18.7kW PV > 110MWh generated
Ripple 6.6kW Wind + 4.5kW PV > 33MWh generated
7 Other RE Coop's
105kWh EV storage
90kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 530 m3
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Re: Nowty Towers DIY Battery Project

#20

Post by resybaby »

Looking really tidy Nowty, and as expected another cracking build thread
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