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Chuck's 18650 14S120P+1 UK Powerwall.
#11
I like the smaller pack Idea where at camp I have a wall of 7s56p cells but those 56 cells are broken into 8p packs (I scored 8 cell holders a long time ago off ebay for stupid cheap) and I put those 7 sets of 8 on bus bars for each cell. Now if I have an issue with a pack or a cell I can just pull that set of 8 out and the rest of the wall remains intact and running.

For my home wall I am going bigger number of cells in Parallel so I purchased some of the 4x5 holders from Keith (Da Man) and am going to make 20p packs for an eventual 7s 400p Wall as I will be looking to run 120V inverter and the ones I have my eyes on are 24V only (MPP LV series)
******Hi My name is Jason and I have SOCD (Solar Obsessive Compulsive Disorder)*******
Current Powerwall - 1400 Cells 7s200p (modular 40p packs) ~ 12kWh of storage     4x 315W Canadian Solar Panels

Working on the next 7s40p packs     ~2.5kWh

Waiting on 2000 Cells of unused Sony vt4 (2000mah 30A) ~ 15kWh      hehehehehe  More Power
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#12
(09-18-2018, 12:13 PM)jdeadman Wrote: I like the smaller pack Idea where at camp I have a wall of 7s56p cells but those 56 cells are broken into 8p packs (I scored 8 cell holders a long time ago off ebay for stupid cheap) and I put those 7 sets of 8 on bus bars for each cell.   Now if I have an issue with a pack or a cell I can just pull that set of 8 out and the rest of the wall remains intact and running.

For my home wall I am going bigger number of cells in Parallel so I purchased some of the 4x5 holders from Keith (Da Man) and am going to make 20p packs for an eventual 7s  400p Wall as I will be looking to run 120V inverter and the ones I have my eyes on are 24V only (MPP LV series)

Yeah I like the idea of the smaller packs too. Only thing I'm thinking is that once I've set up a string of 14 packs, trying to match up another 14 packs to exactly the same capacities may be difficult and cause balancing issues. I'm assuming that multiple batteries in parallel works the same as cells in parallel. So a slight variation in total battery capacity won't cause to much of an issue. Or does it not work that way with batteries.

If not I'm probably better of waiting until I've processed enough for the 120p packs but build them as 28 x 60p and then either link them up in a sort of 14s with 2 x60p in parallel still using only 14 longmons.

(09-18-2018, 01:11 PM)chuckp Wrote:
(09-18-2018, 12:13 PM)jdeadman Wrote: I like the smaller pack Idea where at camp I have a wall of 7s56p cells but those 56 cells are broken into 8p packs (I scored 8 cell holders a long time ago off ebay for stupid cheap) and I put those 7 sets of 8 on bus bars for each cell.   Now if I have an issue with a pack or a cell I can just pull that set of 8 out and the rest of the wall remains intact and running.

For my home wall I am going bigger number of cells in Parallel so I purchased some of the 4x5 holders from Keith (Da Man) and am going to make 20p packs for an eventual 7s  400p Wall as I will be looking to run 120V inverter and the ones I have my eyes on are 24V only (MPP LV series)

Yeah I like the idea of the smaller packs too. Only thing I'm thinking is that once I've set up a string of 14 packs, trying to match up another 14 packs to exactly the same capacities may be difficult and cause balancing issues. I'm assuming that multiple batteries in parallel works the same as cells in parallel. So a slight variation in total battery capacity won't cause to much of an issue. Or does it not work that way with batteries.

If not I'm probably better of waiting until I've processed enough for the 120p packs but build them as 28 x 60p and then either link them up in a sort of 14s with 2 x60p in parallel still using only 14 longmons.

Sorry  I'm being a total twat.

Even if the additional 14 pack capacities are different it won't matter as long as they are balanced between them. 

It would be no different from putting cells of different capacities in a single pack once connected in parallel.
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
28 X 40P 18650 cell packs/modules configured as 14S 80P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
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#13
I use an excel spreadsheet to load my cells data into and build a string of 7 (or 14 in yourcase.) And generally make sure to have about 1/3 more cells than needed to make the pack balanced in capacity. Now what I have found that testeing the cells alone and then making a pack then testing that pack there are some differences in capacity when testing at a lower rate of discharge so the combined tested mah does not add up to what I get out of the built packs.

So combat this I have put together a 20p Testing board and hooked it up to one of my RC chargers and after I test each cell and put them through repackr and organize them into packs I take the cells of that packs and put them together in the 20P testboard and test the capacity. My RC can discharge at 10A and charge at 15A so I cycle the battery pack twice and average the numbers. I generally get about an extra 5% out of the cells but it varries with the cells that go into the pack.

I then take that data from the set of 7 packs and if there is one out of spec with the rest I will swap out a cell or 2 and test again. and get it close as a pack
******Hi My name is Jason and I have SOCD (Solar Obsessive Compulsive Disorder)*******
Current Powerwall - 1400 Cells 7s200p (modular 40p packs) ~ 12kWh of storage     4x 315W Canadian Solar Panels

Working on the next 7s40p packs     ~2.5kWh

Waiting on 2000 Cells of unused Sony vt4 (2000mah 30A) ~ 15kWh      hehehehehe  More Power
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#14
(09-18-2018, 01:21 PM)jdeadman Wrote: I use an excel spreadsheet to load my cells data into and build a string of 7 (or 14 in yourcase.) And generally make sure to have about 1/3 more cells than needed to make the pack balanced in capacity.   Now what I have found that testeing the cells alone and then making a pack then testing that pack there are some differences in capacity when testing at a lower rate of discharge so the combined tested mah does not add up to what I get out of the built packs.  

So combat this I have put together a 20p Testing board and hooked it up to one of my RC chargers and after I test each cell and put them through repackr and organize them into packs I take the cells of that packs and put them together in the 20P testboard and test the capacity.   My RC can discharge at 10A and charge at 15A so I cycle the battery pack twice and average the numbers.   I generally get about an extra 5% out of the cells but it varries with the cells that go into the pack.

I then take that data from the set of 7 packs and if there is one out of spec with the rest I will swap out a cell or 2 and test again.  and get it close as a pack

That sounds like a great way of doing it.

At the moment I have only added all the tested capacities for a14s60p to the rePackr, the packs all come out at a -1 mAh to 2 mAh divergence, between 159 mAh to 273 mAh deviation and a capacity of131 Amps.
jdeadman likes this post
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
28 X 40P 18650 cell packs/modules configured as 14S 80P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
Reply
#15
Another night unable to sleep. So thought I'd have a quick test run of my homebuild spot welder.



First attempt at welding fuses to cells went well.



Practice spot weld fuses to cells and solder to busbar.



Soldering to busbar needs a little more practice but its getting there.
Korishan likes this post
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
28 X 40P 18650 cell packs/modules configured as 14S 80P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
Reply
#16
Complete U turn on my project. I have now decided I'm going to go with 40P packs.

Start off with a 14S40P to get it up and running.
Than build another 2 sets of 40P and add the packs in parallel with the first set, once I have another full set.
I will go with 3 sets of 40P and make them up to a 14S120P for the first string. Once up and running as a 14S120P then I'll start on a second string. Once thats running then I'll start to build some higher capacity packs and swap out the lowest capacity 40P packs.

Started on the first of my many packs this evening.



I have used resistor wires for the -ve side and glass axial fuses on the +ve. Spot welded the fuses and links to cells will solder to busbars. 

Ran out of solder before I could finish all the joints so I've ordered more in for tomorrow.

Going to use some 10 AWG Silicon coated flexible wire and Anderson plugs for the connections.
Ibiza likes this post
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
28 X 40P 18650 cell packs/modules configured as 14S 80P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
Reply
#17
Solder arrived. So full steam ahead with my pack builds.

Pack 1 completed,



Now on to the next.
jdeadman and Kenbat like this post
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
28 X 40P 18650 cell packs/modules configured as 14S 80P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
Reply
#18
4 down 10 more to go for my fist string.



I really like these Anderson connectors,
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
28 X 40P 18650 cell packs/modules configured as 14S 80P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
Reply
#19
Seriously neat job with the fuses there! Nicely done Smile
chuckp likes this post
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#20
(09-28-2018, 11:14 PM)Daveyboy Wrote: Seriously neat job with the fuses there! Nicely done Smile

Thanks buddy. Smile I've 8 done now slowly getting there.
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
28 X 40P 18650 cell packs/modules configured as 14S 80P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
Reply


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