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JAP (Just Another Powerwall or Jesus Angel's Powerwall)
#31
(11-18-2017, 06:48 PM)cmg_george Wrote: Hi @jesusangel, how is the balancer working?
Still having problem with ESP hang?

Yes, not very often, maybe one balancer per week or less, but some time when it hangs the mosfet keep activated and if I don't reset it it unbalances this pack, I have grafana alerts on Telegram so I have a message if a balancer stop sending data or goes out of UV or OV limits so not a big problem.
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#32
Hey there,

as im looking for an idea of an bms i like the ESP-version you build up.

Why dont you integrate a external watchdog to the esp? You could simply add it to one of the left io´s and if the WDT doenst see the timer comming it will toggle the reset pin. Many different things available in SOT-23 or SO8 like these folks here

http://www.ti.com/lit/an/slva039/slva039.pdf

Some of them are also available with programmingresistor for the wdt-period


regards

Carsten

After i read the fully thread i would like to give the advice that the ESP8266 is taking at me (As a Node-MCU in Openhab Smart-Home) 80mA @5V. So thats 1,92Ah over a day. And thats without all the losses in boost-converter, voltage divider etc.

If you will achieve your pack with your 800 cells @ 2Ah with 14s youll get ~ 115Ah per block. That means youll get 1,7% discharge by the ESP per day...
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#33
(11-18-2017, 09:37 PM)Klommer Wrote: Hey there,

as im looking for an idea of an bms i like the ESP-version you build up.

Why dont you integrate a external watchdog to the esp? You could simply add it to one of the left io´s and if the WDT doenst see the timer comming it will toggle the reset pin. Many different things available in SOT-23 or SO8 like these folks here

http://www.ti.com/lit/an/slva039/slva039.pdf

Some of them are also available with programmingresistor for the wdt-period


regards

Carsten

After i read the fully thread i would like to give the advice that the ESP8266 is taking at me (As a Node-MCU in Openhab Smart-Home) 80mA @5V. So thats 1,92Ah over a day. And thats without all the losses in boost-converter, voltage divider etc.

If you will achieve your pack with your 800 cells @ 2Ah with 14s youll get ~ 115Ah per block. That means youll get 1,7% discharge by the ESP per day...

Yes even a 555 would solve the problem but I won't unmount the 14 balancers and redo them. I already made it once. The 14 ESP consume 134 watts every day, 0.4w ESP/hour. The MPP Solar Inverter comsumes 200 time more, more than 80w/h, not very optimized hardware in both cases, you must dedicate a couple of panels only to feed the whole system.

Regards
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#34
y thats right, the perfect system was not made at all...
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#35
Building next 14 Packs, this time with XT60 connectors and some fexible cable.

I've made my packs with very basic tools, so even a simple hole is not at the right position, or the twisted busbars have measurement differences. To mitigate the problems that this causes I will connect with flexible cable and hang the packs from the wall busbars in other way, a couple of hooks or similar.


   

No much time recently so will take some time.

Regards
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#36
I can see some issues on that pack. Your fuses are crossing each other and even the legs are. Thats not very good. They should all be firmly and nicely attached with no contact
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#37
Not a good picture, no fuse makes contact with other in the inner side. So there is only a path from positive side of every cell to the fusible part of one single fuse, from that part to the busbars yes some can be making contact with others and finally even 4 are solder in same place of the busbar.
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#38
You should shorten the legs on the fuses. Even if the legs are 2mm long, that's long enough to make contact Wink
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#39
Picture updated
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#40
 

You should rearrange them somewhat. The rings show where i meant its way to close. No need to keep them tangled like that. Its just extra work the day you need to work with it.

Cut off the legs and put them all in same direction kind of and it will work.
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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