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Wolf's PowIRwall
#61
(08-31-2020, 02:38 PM)OffGridInTheCity Wrote: When these are ready...    do you have 14 packs and this will take you to 28 packs?   Will you be having 2 x 14s batteries or paralleling these new packs in with existing packs. 
Its so much fun to get 1,000(s) of cells hooked up ready to charge and discharge! Smile
Yes it will take me to 28 packs.
I am more than likely going with 2 X 14s. Besides I already have the longmons.
The new and improved plan is to have 4 X 14s with 1 pack to be a backup spare. Yea I got the bug Big Grin
Right now I'm working out a rotation strategy in my minds eye but I'm not sure how Batrium would fit into this picture.
The plan would be to keep 3 packs live and 1 pack as an emergency spare. Winter storm, snow covered panels power failure etc.
I have found new respect for my 4s3p lead acids though. For one they don't mind being fully charged and can be charged easily at sub 0° C.
They are on a tender and can be easily switched in. Last resort only though.
As winter is approaching I have yet an untested heating system to keep the Li-ion's above 0° C preferably at least 5° C.
We will see.

Yes it is a lot of fun. I am in the process of getting another ~2800 cells to finish the new and improved plan.
Stay tuned though because all plans are subject to change.
As long as 18650's are available who knows what will happen. Cool



(08-31-2020, 03:59 PM)daromer Wrote: Wolf: Perhaps you said this before but what do you use to check Humidity and temperature and what is used for the PWM to the fans ?

I assume you are talking about the battery box.

I use an ESP32 to collect temp and humidity from a DHT22.
The ESp32 feeds (2) 3.3V relays which in turn feed (1) 5V 2 channel 30A relay to power the fans with 12V and also the (experimental) Heaters.
I know I could have used a level shifter. Next design I promise. Smile

Ah the PWM on the fans. Yea that was a lot of fun. Actuall the PWM by itself with a ds18b20 as the temp source and a quick map of themp to PWM was easy.
Also getting Fan RPM by itself from the fans hall switches wasn't that bad either. Now getting both of them running together on an ESP32 that was a challenge.
Giving 3 fans a PWM signal from 1 ESP32 wasn't that hard either but I couldn't figure out how to get RPM from 3 fans on 1 ESP32.
So each fan has its own ESP32 with a ds18b20 to control the speed. Sounds kind of neat as they sync with each other.
I will more than happily share the sketch with you if you want it. It took me a good month to figure it out. But then again I am an amateur.

My other 2 fan sets are  Shed Intake Air and Shed Exhaust Air.

Those where initially controlled by AW1209 Temperature Control Switches which as a matter of fact just recently failed.
They tied to a DC 12V 3Bit PWM 4-Wire Fan Temperature Controller. Those still work fine.
So I just recently changed the 2 AW1209s  to an ESP32 with 3 ds18b20s.
Shed temp, intake air temp right and left. It controls 6 server case fans. I was not going with RPM sensors maybe later. Tongue

As you can see I am a fan of ESP32 I got all kinds of them in stock (fans too). If I can write the code to sense it and control it I'm on it.

Wolf
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#62
Small update.

9 packs spot welded 5 to go.

I do love the Kweld.
 

Wolf
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Great prices and superb service.
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#63
Nice!

I like the esp32 but rarely use it. Its way to expensive Wink ESP8266 is cheaper and even cheaper is the ESP12 if you dont need many pins Big Grin
DHT22 is used alot here as well.
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YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#64
Great Progress
Second Life Storage Cell Finder
Get up to 10% off with coupon code 'Powerwalls'
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BigBattery USA  https://bit.ly/Bigbattery
Power 2 Spare USA  https://ebay.to/2SuJWsr
Pro-LOX Netherlands  https://ebay.to/2HsyPKr
Paolo Italy https://ebay.to/38xPUhT
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#65
Small update all 14 packs have been capacity tested and the results are very good.

All packs were regen charged to 4.2V and discharged to 3.0V at 30A with an iCharger X8.
Now they are ready for the Lexan sides and put into production.


Results of test


On another note got my hands onto a Victron Smart Solar 150/60 and started to play with the Venus OS on a RasPi.
Once I built the interface cable and plugged it in the Venus software recognized it.


Turned on MQTT and now working with node red to bring the data to my influx DB and then build a grafana dashboard to show and record live metrics.

Stay tuned on that as I have a rudimentary flow working....... Big Grin

Wolf
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Great ABB shunt breaker seller River City Industrial
Great prices and superb service.
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#66
Are these cells from the LG M26 ninebot batteries?
Very good results. so basically the cells are tested as good as new. This is encouraging as I have a few (2300-2500 M26 cells)
later floyd.
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#67
(09-20-2020, 11:45 PM)floydR Wrote: Are these cells from the LG M26 ninebot batteries?
Very good results. so basically the cells are tested as good as new. This is encouraging as I have a few (2300-2500 M26 cells)
later floyd.
@floydR,

Yes they are and I am very happy with the results which precipitated the purchase of 2800 more.
Volume discount you know Big Grin
Wolf
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Great ABB shunt breaker seller River City Industrial
Great prices and superb service.
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