3000W Flatpack2 HE 48V chargers spotted on Ebay for £15

[Mouse]

Spotted this on ebay and got myself a few as they're only £15 each and usually 10X that and thought I'd share the finding as there appears to be a large number of them available.

If they are like the Eltek Flatpack2 HE 2000W ones they will be CAN bus controlled which has been reverse engineered and stackable for higher battery voltage.
https://www.ebay.co.uk/itm/393534025226

[rstevens81]

Thanks ordered 4, at the least with a Prius/Yaris inverter.i can create a 12kw garage (chademo) fast charge

[rstevens81]

If anyone is getting some power board PCBs fabricated at jlc etc give me a shout and we can split the cost

[rstevens81]

Disregard the above.... Anyone happen to know what sort of connector it is?

Thanks if you know till then I'll keep hunting

[Mouse]

Disregard the above.... Anyone happen to know what sort of connector it is?

I've bought a few so I'm going to be finding out one way or another.

[PoloLbricolo]

Got my self a few of them, thanks for the smoking deal !

[PoloLbricolo]

any leads on the pinout ?

[evMacGyver]

Found this: https://dokumen.tips/documents/flatpack ... ifier.html
"Mating Connector P/N: 51866-048LF"

This worries me a bit "Isolation 100 VDC – output to earth", was thinking stacking many of these but this is less than other models..

[rstevens81]

Are there any electrical engineers who can clarify, does this mean that charger modules need to be isolated from each other (rubber mounts or otherwise physically separated).or does this mean that stacking wise we need to not get too close to 100v i.e. 2 series to parallel to a maximum voltage of 90v say?

[celeron55]

"Isolation: 3.0 kVAC – input and output
1.5 kVAC – input to earth
100 VDC – output to earth"

The only earths the flatpack2 knows about of course is its case and the mains input earth, which usually are connected together. So if you cut both earths, the case will essentially be loosely connected probably to the negative output terminal, with only 100V worth of isolation. You basically might as well connect the earth to the negative output terminal then.

To me this doesn't sound like a very good idea. I'd do it only if the charger is installed inside a grounded metal enclosure (isolated, of course) along with the battery itself.

Then again, you could open it and inspect what the output isolation consists of, and try to see if you can widen the spec just by looking at it. I don't have experience on what to expect there.

[thornogson]

this is the connector at the back
https://www.digikey.co.uk/en/products/d ... 2AzEAugL5A

and I think this is the plug for the back of it
https://www.ebay.co.uk/itm/114232204542 ... SwxbJex8Us

As I now understand it , the cases are all earthed via the 240vAC hookup and all + and - terminals are 'floating' , ie not tied to ground , so put them in a cage together and earth it and link + and - to your hearts content , but don't take my word for it !

[thornogson]

Been reverse engineering these things, this works but is crude , I’ll post my voltage findings when I’ve written them up . I’ve got 4 in series now giving 200+v dc . What could possibly go wrong!!

[pablo_mtl]

Good job thornogson! I may have missed it, but: Is this version also 125kbps CAN controlled using the Eltek FP protocol found everywhere?

I had great success with the other "blade-type" connector Eltek flatpacks, but this one is intriguing. Thanks for working on it!

[thornogson]

Here’s what I found poking around with a voltmeter with the unit switched on . Perhaps some of you CAN savvy people can tell what’s going on and how to control a number of these chained together

[thornogson]

Good stuff on eltek here :
https://www.thebackshed.com/forum/ViewT ... &TID=12035 see p 2 for driving multiples