Beginners Guide to Processing 18650 Cells | Cell Database


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Pete's BMS Story - Regular updates with issues or excitement I find along the way.
#11
In creepy stalker mode Wink
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#12
Paulkennet. There is no such limit. Atleast not on proper BMS systems like this one Smile It can handle up to 249 packs. And since it can discharge up to 2A (With fan) But its recomended to not go higher than 1A you could have several 100kWh in total connected on same Master. Since this system is a modular slave-master approach.

They have most functions anyone ever would need and some more ) I have though found a few that they didnt have but as said.. All the others covers most whats needed.
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#13
(02-23-2017, 05:54 AM)hbpowerwall Wrote: Sounds like we'll need to find a way to download your brain and install it on a thumb drive for future reference!  Big Grin
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#14
error found in boobs - can't complete request, Google I.T. Crowd and follow their advice Smile
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http://www.hbpowerwall.com for a full video diary of my project.... 
https://www.amazon.com/shop/hbpowerwall to buy stuff I use Smile 
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#15
Got it up and running with issues naturally, grateful I didn't blow the thing up from stupidity. Moving on 

http://www.hbpowerwall.com for a full video diary of my project.... 
https://www.amazon.com/shop/hbpowerwall to buy stuff I use Smile 
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#16
(02-24-2017, 06:07 AM)hbpowerwall Wrote: In the words of Homer Simpson:   DOH!
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#17
I would assume they did an OK job on the thing, and included a diode or mosfet based polarity protection,

what i dont fully understand is the red flash code, this may hint that they are using a little bridge rectifier to power there microcontroller, but that would seem odd to me.
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#18
Yeah, I agree with Rerouter. Seems they put a few extra protections in their unit. Would be the smart thing to do since you don't want your customers constantly blowing up the hardware and giving a bad rap to the company. This definitely adds cred to the companies building style and hardiness.

Love to see what other "mistakes" you make, Mike Tongue
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#19
Might do it to a few more volts see how it holds up, this time deliberate as I'm told it can handle it. Smile one thing to be told another to see it..
http://www.hbpowerwall.com for a full video diary of my project.... 
https://www.amazon.com/shop/hbpowerwall to buy stuff I use Smile 
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#20
Read through there brochure, and its indeed a N type mosfet acting as a reverse polarity protection circuit, which explains the +-20V rating, (what the gate of the mosfet is rated for)

Something like this http://electronicdesign.com/site-files/e...y_F4_0.gif

The other thing i can tell is the units are quite low power, and have a sufficient amount of local capacitance to keep the module on for quite a while, the communications looked to work for about 3 seconds after removing a cell, (still curious why it was still broadcasting its last known value) and the unit itself looked like it took a full 12 seconds or so to shut down (low voltage cut out)

Now its the +20V spec i would be more cautious on, as in the negative protected state, the circuit cannot complete a loop, its isolated, but in the positive, i would imagine they are using the internal protection diodes in there processor to shunt the voltage from the ADC sense, which being as crazy low power as it is, could be a problem.
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