Like many I have been absorbing all the knowledge you guys have been kindlypassing on and have began my own 57Kw build.
So the idea behind my build is I want to build a home next year that is off grid (electrically). I plan to have mains water as I cant guaranteetherain water harvesting can sustain us if we continue to have summers like we just had in the UK, plus connecting to mains water is relatively cheap as opposed to connecting to the grid. It will be super insulated with ground source heat pump for heating and hot water.
Initially I planned to have 120 size packs for a 14s system and then add further 14s packs in parallel as I get enough cells. And was going to weld up a nice housing and have it powder coatedto put them all in.However I found this box lying around in work which had battery storage written all over it soit changed the plan a little, hence the 57Kw build.
Ive done a basic drawing on CAD to help get an ideaofspacing thepacks evenlyand they should fit like a glove leaving around 25mm gap per pack and plenty of room front and back for air flow. Ican't decide weather to cut a large section out of the dooror not and put a pice of perspex or similar with lots of holes in for venting and also to see the longmons or just leave it and put some vents along the sides.
As you guys know better than me gathering and processing cells is time consuming work. I've been collecting for around a month or so now and havearound 1500 tested cells and just the other day I picked up over 300 packs for 150 which should give me a further 1800 give or take.
With me using 240 packs its going to take 3,360 cells for each parallel totalling 6,720 cells needed. My cellcut off is 2,000mah so I'm guessing I'm going to have to test around 9,000 -10,000 cells to get what I need.
As far as bus bars go I thought I could pick a few brains for suggestions. My plan is to have 3 pieces of U shape 10mm2 copper wire to connect all the 0.15mm tinned copper wire fuses to each cell and then have 16mm x 4.5mm copper flat bar to connect each pack together at each end as follows.
Ideally I would connect one to the back and one to the front but it would be a pain in arse to get to the back bolt to pull individual packs out. Do you think it would still draw current from the cells at the back of the pack if i was drawing say 120 to 150amps from the battery bank? It would only be 5.4 amps per 240 cell pack.
So the idea behind my build is I want to build a home next year that is off grid (electrically). I plan to have mains water as I cant guaranteetherain water harvesting can sustain us if we continue to have summers like we just had in the UK, plus connecting to mains water is relatively cheap as opposed to connecting to the grid. It will be super insulated with ground source heat pump for heating and hot water.
Initially I planned to have 120 size packs for a 14s system and then add further 14s packs in parallel as I get enough cells. And was going to weld up a nice housing and have it powder coatedto put them all in.However I found this box lying around in work which had battery storage written all over it soit changed the plan a little, hence the 57Kw build.
Ive done a basic drawing on CAD to help get an ideaofspacing thepacks evenlyand they should fit like a glove leaving around 25mm gap per pack and plenty of room front and back for air flow. Ican't decide weather to cut a large section out of the dooror not and put a pice of perspex or similar with lots of holes in for venting and also to see the longmons or just leave it and put some vents along the sides.
As you guys know better than me gathering and processing cells is time consuming work. I've been collecting for around a month or so now and havearound 1500 tested cells and just the other day I picked up over 300 packs for 150 which should give me a further 1800 give or take.
With me using 240 packs its going to take 3,360 cells for each parallel totalling 6,720 cells needed. My cellcut off is 2,000mah so I'm guessing I'm going to have to test around 9,000 -10,000 cells to get what I need.
As far as bus bars go I thought I could pick a few brains for suggestions. My plan is to have 3 pieces of U shape 10mm2 copper wire to connect all the 0.15mm tinned copper wire fuses to each cell and then have 16mm x 4.5mm copper flat bar to connect each pack together at each end as follows.
Ideally I would connect one to the back and one to the front but it would be a pain in arse to get to the back bolt to pull individual packs out. Do you think it would still draw current from the cells at the back of the pack if i was drawing say 120 to 150amps from the battery bank? It would only be 5.4 amps per 240 cell pack.