I can report further on the specs of the flatpacks. The specsheet says „Hot plug-in inrush current limiting“ and „Short circuit proof“. I asked Eltek about max current in the case of shortcut (i.e. connecting with the capacitors of the controller not precharged yet). They told me it will be limited to max 105%, which would be less than 44A in case of the 2kW Unit.
Conclusion regarding everything I know and asked them so far: The flatpacks are some incredibly good rectifiers, which is likely a result of the high quality standards in telecommunication industry and the reliability necessary for constant use even under bad circumstances.
Apart from faults due to human errors, i.e. a wrong wiring, I consider the flatpacks a safe charging solution which will not harm our bikes even in case of an opening contactor or other events. It will not damage any components nor will it blow up the charge fuse.
Furthermore I can report that a set of two flatpacks is the limit for a FXS and that the app is apparently not reporting the full charge current, actual current seems to be a little bit higher. Had the opportunity to look into both of my BMS, they reported a historic max charge current of 25,6 and 24,8 A, which is pretty close to the limit set to 26A ;-) Don't know if there's still any tolerance.
I think this might be the case due to slight imbalance in between the two packs, so one gets a little more current than the other. Calculated total amperage would be 41.7 of the flatpacks and 6.2 of the onboard, so basically 48A in total, which would equal to 24A for each pack.
So this weekend i connected the canbus connections of the 2 "bottom" flatpacks together to be able to read-out and control the current of both sets of flatpacks.
The good news is that it is no problem connecting those 2 canbusses without blowing anything up (so far) 
This way i can read out both "bottom" flatpacks and show the data on the tiny oled screen in one of them.
Great to hear that this works as expected 😊 And concerning the additional SMS module and your PID programming…you’re insane, but in a positive way! 😃
What I still don’t understand: Why didn’t you notice the lack of amperage control in lower voltages before? Did you never make use of it so far? Could actually see the same behavior on my flatpacks now.
I was a week offline becourse of work. But holymoly.. an SMS service Remmie 
All such perfect good improvements.. Wow.
I'm gonna spend the next day's working on my double set of Eltek FP2k's and building a case around it. So I can leave it next to my bike while charging. Also in the rain and yes, its vented!
Very interested in this, have been thinking about a good solution for a while. So far I’m using some plastic bags, which works but looks very bad
We could get them directly from Eltek Germany for a price of 280€ each. Still expensive, but cheaper than the else quoted 360€.
The price is only valid if at least 20 Flatpacks are bought. So far we have (outside of this forum) eight, so we would need another 12 for this to happen.
I asked for a quote as well, let’s see what they offer to me 😉 I might want to buy some as well, but not sure if and how many yet. I’ll know it in a week or so.
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Topic: My homemade 'Supercharger' for a ZERO Version 2 (Read 37573 times)