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Chuck's 18650 14S120P+1 UK Powerwall.
#71
Powerwall has been up and running for a couple of weeks now, so far all good.
Packs are staying fairly balanced with a difference of less than 0.030V at the highest, typically around 0.022 to 0.025, .

I've had to do a few charges from the off peak grid supply to keep them online due a lack of Sun at the moment.
However we are pretty much covering our peak consumption, obviously a bit of an increase in the off peak due to charging but since it's half the cost of the peak rate still works out for the better.
On the odd days I'm getting a fair solar gain I'm still exporting a little but nowhere near as much as I was. Daily self use rate on the solar is now closer to 70% rather than the 20% before the wall went live. The last few days due to the low gain i have seen a 100% self use rate. Even on a bad day before I would still export 60% or more.

I'm not sure just how accurate the Solaman App data is, although they say it is real time monitoring i notice sometimes it can be a good 20 mins or more between data from the inverter refreshing with the app.

Need to pull my finger out now, source some more cells and get some more storage capacity.
Korishan, ajw22, jdeadman like this post
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
42 X 40P 18650 cell packs/modules configured as 14S 120P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
About halfway into my next batch of cells for another 14 40P packs
13 kWh processed and operational so far.
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#72
Love the look and journey you've been on chuck, going back to the start of your build where did you source the fuses from? Are the plans for your battery bracket freely available? Is your battery wall covered in?
So many questions.
Thanks in advance
chuckp likes this post
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#73
Been busy processing more cells, got a good batch this time.
463 cells after charging, weeding out heaters and self dischargers.
Currently carrying out capacity testing, so far approx 90% are testing between 2100 mAh and 2500 mAh and at between 70-90% of original capacity, a few have even been slightly over specified.
IR's between 45 and 120 mohm but this is only Opus testing so not really a good example.
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
42 X 40P 18650 cell packs/modules configured as 14S 120P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
About halfway into my next batch of cells for another 14 40P packs
13 kWh processed and operational so far.
Reply
#74
Little update, two weeks ago I completed my latest batch of 14 40P packs/modules and got them mounted on the powerwall, now putting my storage capacity up to 13+ kWh.



They have been running for a little over a week now and everything is looking good.

Getting a full solar charge into the battery and suppling the daily consumption for the house, still exporting more than I’d like to, but that will get better once I have another row or two of modules installed.

At the moment the battery is lasting all evening and most of the night. I have a period of a few hours in the morning when the system is in standby and I’m using the grid before the sunrises enough to meet the house demands and have a sufficient surplus to start charging the battery.

Generally very pleased with how it’s going.

I’ve given up on the idea of try to read the Xiaoxing BMS on a Raspberry Pi. I did find a few sources for code online but I just can’t get my head around it all.
Uhtred, ajw22, Wolf like this post
UK Southwest.

7 kWp Solar Panels (28 x 250Wp Shinetime Mono).
14 X APS YC500i Micro Inverters.
42 X 40P 18650 cell packs/modules configured as 14S 120P.
Sofar Mass Energy ME3000SP AC coupled charger/inverter.
Still sourcing and processing cells for powerwall.
About halfway into my next batch of cells for another 14 40P packs
13 kWh processed and operational so far.
Reply


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