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Small Powerwall in Germany
#31
Update:
New charge controller arrived after a long wait.



Unfortunately, one must first buy an adapter from serial to USB to read the charge controller Sad



if someone is looking for a good adapter, I have the link on Amazon here.

According to the instructions, first the battery is connected to the charge controller and then the solar cells.
If the solar cells are connected without a battery, the charge controller would break. At least that's how it stands in the manual.
What happens if my BMS switches off the battery because a battery pack has overvoltage or has an undervoltage?

Mfg

Iron
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#32
(08-26-2018, 07:05 PM)IronSky Wrote: ...

According to the instructions, first the battery is connected to the charge controller and then the solar cells.
If the solar cells are connected without a battery, the charge controller would break. At least that's how it stands in the manual.
What happens if my BMS switches off the battery because a battery pack has overvoltage or has an undervoltage?

...

It will most likely damage the charge controller.
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#33
(08-27-2018, 04:54 AM)Geek Wrote:
(08-26-2018, 07:05 PM)IronSky Wrote: ...

According to the instructions, first the battery is connected to the charge controller and then the solar cells.
If the solar cells are connected without a battery, the charge controller would break. At least that's how it stands in the manual.
What happens if my BMS switches off the battery because a battery pack has overvoltage or has an undervoltage?

...

It will most likely damage the charge controller.

Well fine. Then my BMS protects my battery and kills the charge controller. Angry
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#34
(08-26-2018, 07:05 PM)IronSky Wrote: What happens if my BMS switches off the battery because a battery pack has overvoltage or has an undervoltage?

The reason the battery needs to be connected first is that the FETs or other switches can be turned on/off in the proper order. If the solar is connected first, the protection FET isn't turned on yet and energy will flow into the wrong places. This causes either a driving transistor to go boom, or the IC to die.
Usually after connecting a battery, and even later disconnecting, there's enough charge to allow the solar to be connected and not do any damage. But this isn't recommended. Try to always connect these types of devices in the proper order to not damage the unit.
IronSky likes this post
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#35
Small update:
Unfortunately, the Chinese BMS is defective after about 1 year. Although it still shows the voltage of each individual cell, it no longer switches off in the event of overvoltage or other errors.

That's why I've now got the DIYBMS v4 and I'm very happy with it. A relay is coming soon to switch the charge controller and the inverter on and off.

The 13th pack looks a little different, this is just a test to see how this cell behaves.

Mfg Iron Smile


neill121 and Walde like this post
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#36
Big Grin Wink Wink Wink
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#37
ooh, I like the little heatsinks - I might have to get some for my DIYBMS modules. Did you have a part number?
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#38
https://www.reichelt.de/kuehlkoerper-smd...8.html?r=1
I took this and sawed through in the middle. You can also drill a hole in the middle, where the heat sensor is and the heat sink is completely on it. 19x13
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