DIY 'Chargenectifier'

[42OhmsPA]

This one (3kW R48-3000e3) allows you to pick the output voltage and comes with an adapter board:

https://www.aliexpress.com/item/1005003755306962.html

Under €100 including shipping.

Well this may be way easier than I thought... The seller stated this will accept 120vac input. I asked for clarity 1 more time, I'll likely order tonight if I'm awake when they reply.
US $49.82 | Emerson R48-3000e3 Communication Switching Power Supply Module 48V Induction Heater Power Supply Disassemble With interface

https://a.aliexpress.com/_mMhn53y

Thank you upNorth for your personal help and advice on this. ??

 

[upnorthandpersonal]

Yeah, make sure it accepts 120V for sure. I've not looked into that, but it looks not to be the case from the label. I'm planning on getting a couple of them myself.
Keep us informed how it goes!

 

[upnorthandpersonal]

@42OhmsPA This is the datasheet:

https://www.vertiv.com/globalassets/products/critical-power/dc-power-systems/netsure-731-a412/r48-3000e3-datasheet.pdf

Seems it can accept 120V, but won't be able to deliver it's full potential with it...

 

[42OhmsPA]

@42OhmsPA This is the datasheet:

https://www.vertiv.com/globalassets/products/critical-power/dc-power-systems/netsure-731-a412/r48-3000e3-datasheet.pdf

Seems it can accept 120V, but won't be able to deliver it's full potential with it...

Thanks for that (I suppose I should have rtfm ?) I should get ~2kw @ 120vac if I'm eyeballing correctly.

 

[upnorthandpersonal]

Thanks for that (I suppose I should have rtfm ?) I should get ~2kw @ 120vac if I'm eyeballing correctly.

Yes, something like that. Not bad at all for the price really; worth the risk.

 

[Jennifer]

Yes, something like that. Not bad at all for the price really; worth the risk.

Worth the risk for him to do it first... Here Guinea Guinea Guinea Piggy... (holding out my hand with some Scooby snacks for you)... let us know if it arrives.

 

[upnorthandpersonal]

I've played Guinea Pig here plenty of times and would do that in this case as well - I just lack time right now because I'm also fixing BMS issues people have, dealing with the spam on the forums, and some other stuff just within the scope of this forum and solar.

 

[upnorthandpersonal]

Fine, I'll play Guinea Pig as well

 

[Quattrohead]

Just remember these units are used and there is one picture that shows a blown up capacitor.

 

[Quattrohead]

Actually does anyone know of a telecom recycler, there's probably thousands of these things getting trashed in this country every day. I had a kid local to me selling reclaimed batteries from old cell towers.
If I can find his contact info again I'm going to ping him about this.

 

[upnorthandpersonal]

Just remember these units are used and there is one picture that shows a blown up capacitor.

Yes, new ones are slightly more expensive. Still worth the risk; I'll let people here know what I think of it once I get mine.

 

[42OhmsPA]

I'll be ordering one this afternoon, been a hectic day at work.. Seller did confirm 1/2 the amperage at 120v. Still a fair deal.

 

[42OhmsPA]

Would this work too? I have a bigger generator... (I also asked seller for clarity.)


I'm glad the seller knows the product they are selling and honest in replies...

I also found this from another seller.
US $127.05 23%OFF | Charger 90v 120v 0- 20A 15A Adjustable Charger 140v 10-120v LI-ION Lithium Lifepo4 Battery Pack Charger LTO

https://a.aliexpress.com/_mrZ5Bnc

 

[upnorthandpersonal]

Would this work too? I have a bigger generator... (I also asked seller for clarity.)

This could work, yes.

 

[yabert]

Ummm! I was joking about this, but I have a meanwell HLG-320H laying around because I end never use it as DC-DC converter for my Vanabolt (360V battery to 12V).
Soooo... do someone see, based on spec sheet, that it's clear those unit will not work when hook to a PV array?

I test it: https://diysolarforum.com/threads/dc-solar-directly-to-ev-no-ac.26443/post-736974
This power supply can work directly on solar panel ?.... and from AC, of course.

 

[jamiegreen]

Out of curiosity.. does anyone have the real AC power draw of an Emerson/Eltek/Huawei style 3KW power supply at 230v AC? I've seen anything from 17a to 22a printed on them, but I'd sure hope its not 22a! With a power factor of 0.99 and 90+ efficiency I'm wondering what the real draw is.. my geni is rated for 4.5kw continuous but I've found that brings the HZ down way too low so somewhere between 3.5-4 kw is more appropriate, so maybe a 3kw PSU would pull around 3.5kw AC?

I was originally thinking of two 2kw units, but with conversion rates that would probably overload the geni.

 

[zanydroid]

Is the output limit on these units programmable via the control bus? Or via a dial on the unit?

That's probably a feature you want anyway regardless of the quirks of your generator. It's available on the Chargeverter

If you're only powering the chargers then dropping the HZ may be less of an issue. Maybe that also pulls the geni out of its optimal performance band.

 

[upnorthandpersonal]

does anyone have the real AC power draw of an Emerson/Eltek/Huawei style 3KW power supply at 230v AC? I've seen anything from 17a to 22a printed on them

The current it draw is directly related to the voltage you supply. Because it has a wide voltage input range, it also has a wide current output based on that voltage and max power output. Since 3kW is the max output, at 230V, that's a maximum of about 13A. These should be in the 90% efficiency, so even taking that into account, it shouldn't be more than 15A or so.

Is the output limit on these units programmable via the control bus? Or via a dial on the unit?

There should be a control module somewhere, but not sure where to find it. It plugs into the CAN bus as far as I know. That said, they also go into constant current mode, so even if your load is higher, the supply will just deliver whatever it can (similar to a limited power supply when you balance cells).

 

[zanydroid]

There should be a control module somewhere, but not sure where to find it. It plugs into the CAN bus as far as I know. That said, they also go into constant current mode, so even if your load is higher, the supply will just deliver whatever it can (similar to a limited power supply when you balance cells).

Sure. Depending on the user the generator may be the bottleneck so CC needs to be set lower.

 

[upnorthandpersonal]

Sure. Depending on the user the generator may be the bottleneck so CC needs to be set lower.

Yes, of course.

I think the control module needed for these is the Emerson (now Vertiv) NetSure M820D Controller:

https://www.vertiv.com/globalassets/products/critical-power/dc-power-systems/acu-plus-controller-data-sheet.pdf

Manual:

https://www.vertiv.com/4aa234/globalassets/products/critical-power/dc-power-systems/UM1M820BNA_Rev_P_ACU_Controller_79228_1.pdf

There's a few fro sale on eBay and other places...

 

[jamiegreen]

Sure. Depending on the user the generator may be the bottleneck so CC needs to be set lower.

The links posted above to the AliExpress seller are configurable (at least some of his products) I did ask about current limiting and they will do that on the Huawei units before they ship them out to you. Of course there are smaller power supplies available thought that may be better suited to your generators output.

 

[upnorthandpersonal]

Now I really want to figure out the CAN protocol on that Emerson. I'll look around to see if it's available. If not, I might just get the controller and sniff out the protocol that way.

 

[zanydroid]

Are the CAN protocols for these things intended for real time adjustments or more for static configuration?

 

[upnorthandpersonal]

Are the CAN protocols for these things intended for real time adjustments or more for static configuration?

Real time status info, alarms, etc. at least, and communication between rectifiers.

 

[42OhmsPA]

Now I really want to figure out the CAN protocol on that Emerson. I'll look around to see if it's available. If not, I might just get the controller and sniff out the protocol that way.

Emerson/Vertiv R48-series CAN programming?

Currently I'm really into getting my hands on an R48-1000e3. Highly compact and even smaller than an Eltek Flatpack S. Unfortunately I wasn't able to find somebody that's willing to share the CAN protocol with me.. I read through the Eltek thread and I wish we can start something similar for...

endless-sphere.com

That should be helpful.