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Can you add gen2 leaf cells to a gen1 powerwall?
#1
So last year I built my Gen 1 Leaf powerwall in using 28 gen1 modules in 7s4p (14s4p) format and have now got a Gen 2 battery with 88.1% SOH 

I originally planned to replace the Gen1 with Gen2 cells and start fresh with the gen2 modules

But would it be possible to combine the gen1 and gen2 cells in the powerwall? What would be the implications? Can it be done? Has anyone done it?
 
Battery Capacity: 14kwh  = 28x 2011 Nissan eNV200/Leaf Gen1 Modules (14s4p) with Victron Multiplus II GX 48/3000 AC Coupled Inverter
Solar Capacity: 3.18kwh = 12x REC 265PE BLK Solar Panels with SolarEdge SE4000 Inverter
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#2
Zero experience with Leaf cells.
One obvious issue is that the Gen2 module is essentially 2xGen1 modules stuck together (+capacity upgrade), BUT with opposing (-) and (+) terminals.  See pic below.
So inserting those Gen2 modules in your current stack will probably be difficult.... would require major rework on the bus bars.

BigDav likes this post
Modular PowerShelf using 3D printed packs.  60kWh and growing.
https://secondlifestorage.com/showthread.php?tid=6458
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#3
You should be able to run gen1 & gen2 in parallel, chemistry hasn't changed much (if at all!).
Like ajw22 says, it's just physical layout/connection issues to solve.
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Running off solar, DIY & electronics fan :-)
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#4
Agree with above and I'd add that you want to keep capacities matched.    For example, if your Gen1 is 14s (7 modules) at XX AH and you add a Gen2 'battery' in parallel - be sure to test the Gen2s and build a Gen2 battery with similar AH as Gen1s.    No experience with these cells - but sounds like Gen2 might have more capacity - so less cells per battery?
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#5
What BMS are you using?
later Floyd
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#6
(09-29-2020, 02:39 PM)OffGridInTheCity Wrote: Agree with above and I'd add that you want to keep capacities matched.    For example, if your Gen1 is 14s (7 modules) at XX AH and you add a Gen2 'battery' in parallel - be sure to test the Gen2s and build a Gen2 battery with similar AH as Gen1s.    No experience with these cells - but sounds like Gen2 might have more capacity - so less cells per battery?
The same number of physical cells inside the battery but a better battery chemistry. My gen 1 cells are around 70% SOH and my Gen2 is 88%

(09-29-2020, 03:19 PM)floydR Wrote: What BMS are you using?
later Floyd
Im using the Batrium Watchmon 4 with leafmons
Battery Capacity: 14kwh  = 28x 2011 Nissan eNV200/Leaf Gen1 Modules (14s4p) with Victron Multiplus II GX 48/3000 AC Coupled Inverter
Solar Capacity: 3.18kwh = 12x REC 265PE BLK Solar Panels with SolarEdge SE4000 Inverter
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#7
>My gen 1 cells are around 70% SOH and my Gen2 is 88%
Yea - so ideally you want fewer Gen2(s) in a battery that is parallel with Gen1(s).    66ah * 70% = 46ah.   66ah * 88% = 58ah.     This means that if you put the Gen2's in their own battery to parallel with the existing Gen1 - ideally you want 8p of Gen2 (8 * 58ah = 464ah) and 10p (10 * 46 = 460ah) so they have very similar ah(s). 
     
Alternately, if you can reconfigure the Gen1s, you could evenly distribute Gen1/Gen2 in within a single 'battery' so that each 'cell' of 14s has similar ah.
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#8
(09-30-2020, 01:40 PM)BigDav Wrote:
(09-29-2020, 03:19 PM)floydR Wrote: What BMS are you using?
later Floyd
Im using the Batrium Watchmon 4 with leafmons
Good Smile
later floyd
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#9
(09-30-2020, 02:31 PM)OffGridInTheCity Wrote: >My gen 1 cells are around 70% SOH and my Gen2 is 88%
Yea - so ideally you want fewer Gen2(s) in a battery that is parallel with Gen1(s).    66ah * 70% = 46ah.   66ah * 88% = 58ah.     This means that if you put the Gen2's in their own battery to parallel with the existing Gen1 - ideally you want 8p of Gen2 (8 * 58ah = 464ah) and 10p (10 * 46 = 460ah) so they have very similar ah(s). 
     
Alternately, if you can reconfigure the Gen1s, you could evenly distribute Gen1/Gen2 in within a single 'battery' so that each 'cell' of 14s has similar ah.
My plan was to add the gen2 cells to each parallel pack in my existing battery by reconfiguring the busbars and layout etc
So in each parallel stack I would have 4x gen1 modules and 7x gen2 modules
OffGridInTheCity likes this post
Battery Capacity: 14kwh  = 28x 2011 Nissan eNV200/Leaf Gen1 Modules (14s4p) with Victron Multiplus II GX 48/3000 AC Coupled Inverter
Solar Capacity: 3.18kwh = 12x REC 265PE BLK Solar Panels with SolarEdge SE4000 Inverter
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#10
It should work fine. :-)
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