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DIY 'Chargenectifier'

4

42OhmsPA

What's in a title?
Joined
Feb 17, 2022
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Pennsylvania
Based of the informative info recently posted by @ChrisFullPower in another thread I'm intrigued in DIY'ing a charger from used rectifiers.
A quick search on eBay for '48v rectifier' has made me realize it's definitely doable at costs much lower than off the shelf options...

I'll start with a few examples of what I've found.

I'm assuming one would need to figure out a way to adjust the voltage, unless you can find something pre-programmed.

(I apologize for the terrible links, I'm using the ebay app to share the item and copy the link.)
These look promising because you could parallel them together to hit your target and/or have the ability to scale them.
www.ebay.com

**LOT OF 5** Eltek Valere V1000A Power Supply 48v 20A Rectifier | eBay

Find many great new & used options and get the best deals for **LOT OF 5** Eltek Valere V1000A Power Supply 48v 20A Rectifier at the best online prices at eBay! Free shipping for many products!
www.ebay.com

This seems like an excellent price but you'd need more connectors.
www.ebay.com

ELTEK Flatpack2 48V 2000W High Efficiency Rectifier: 241115.105 | eBay

Find many great new & used options and get the best deals for ELTEK Flatpack2 48V 2000W High Efficiency Rectifier: 241115.105 at the best online prices at eBay! Free shipping for many products!
www.ebay.com

This seems like a great option for our friends up North.
www.ebay.com

Alpha Technologies Cordex CXRF-HP 48-2KW 010-622-20-040 Rectifier Power Module | eBay

The Cordex HP 2.0kW is backward compatible with existing Cordex 1.8kW shelves and systems providing users an easy. > Backwards compatible with Cordex 1.8kW shelves and power solutions. temperature operation, HP series rectifiers are also ideal for harsh outside plant enclosure installations.
www.ebay.com


So what am I missing here? I feel like it has to be something substantial or it would already be a popular topic...

Edit - great breakdown for what I consider the nicest build in the thread.
Post in thread 'DIY 'Chargenectifier'' https://diysolarforum.com/threads/diy-chargenectifier.56329/post-1321135
 
Last edited:
The crux of all this is figuring out how to turn these on and communicate with them. It’s not as simple as flip a switch. For that reason I’d stick to either the Eltek Flatpak2 or Huawei r4850. Here are some threads from another board that may be of some use.

endless-sphere.com

ULtra Compact 1800W charger + Eltek programming

Guys i think i have found the world most compact and powerfull charger ever 8) It's a ELTEK 1.8kW flatpack S !! These are availlable in 24 and 48V and take from 100 to 240V. But what is fantastic is that they have the unbeatable 47 W/cu inch density !! and are 96.5% efficient!!! These are...
endless-sphere.com endless-sphere.com

endless-sphere.com

Rectifier Huawei R4850G2 48V 42~58V 3000w

What do you think of this rectifier? High efficiency > 96% Ouput voltage 42~58VDC, default value 53,5VDC Ouput Power 3000w (176~300VAC) Weigh =< 2 KG The datasheet...
endless-sphere.com endless-sphere.com
 
The Hauwei used to be a better value but someone on YouTube make a few videos that got a bunch of views so now it’s gone up in price. But at least he has a good write up about it:


The Huawei rectifier itself goes for around $150 for 3kw and the breakout adapter goes for about $20. You don’t need the adapter but it makes it much easier to mess around with.

The Eltek seems to be more plentiful on eBay (as it’s sold and used in the US) and you can get the 2kw or 3kw for $100-ish. Someone made an adapter PCB that also goes for about $20.

Search around on GitHub and you’ll see a few projects that may give you a good starting point.
 
42OhmsPA said:
Based of the informative info recently posted by @ChrisFullPower in another thread I'm intrigued in DIY'ing a charger from used rectifiers.
A quick search on eBay for '48v rectifier' has made me realize it's definitely doable at costs much lower than off the shelf options...

I'll start with a few examples of what I've found.

I'm assuming one would need to figure out a way to adjust the voltage, unless you can find something pre-programmed.

(I apologize for the terrible links, I'm using the ebay app to share the item and copy the link.)
These look promising because you could parallel them together to hit your target and/or have the ability to scale them.
www.ebay.com

**LOT OF 5** Eltek Valere V1000A Power Supply 48v 20A Rectifier | eBay

Find many great new & used options and get the best deals for **LOT OF 5** Eltek Valere V1000A Power Supply 48v 20A Rectifier at the best online prices at eBay! Free shipping for many products!
www.ebay.com

This seems like an excellent price but you'd need more connectors.
www.ebay.com

ELTEK Flatpack2 48V 2000W High Efficiency Rectifier: 241115.105 | eBay

Find many great new & used options and get the best deals for ELTEK Flatpack2 48V 2000W High Efficiency Rectifier: 241115.105 at the best online prices at eBay! Free shipping for many products!
www.ebay.com

This seems like a great option for our friends up North.
www.ebay.com

Alpha Technologies Cordex CXRF-HP 48-2KW 010-622-20-040 Rectifier Power Module | eBay

The Cordex HP 2.0kW is backward compatible with existing Cordex 1.8kW shelves and systems providing users an easy. > Backwards compatible with Cordex 1.8kW shelves and power solutions. temperature operation, HP series rectifiers are also ideal for harsh outside plant enclosure installations.
www.ebay.com


So what am I missing here? I feel like it has to be something substantial or it would already be a popular topic...
Click to expand...
BRAVO!!!!! That’s what this boards all about, creativity, well done. I spent my own share of time hunting chinese web sites to see who really manufactured that unit. This will be fun to watch.
 
Thank you for the info and links, very helpful @ChrisFullPower
Looks like a another project is going on the never ending rarely completely finished list, using invisible ink and transparent paper of course... ?
 
ChrisFullPower said:
The crux of all this is figuring out how to turn these on and communicate with them.
Click to expand...
This previously posted link goes into it a bit as well as the others below, the 2nd one being a massive thread..


The little voltage/current controller in the below video is pretty cool... link to it below as well.


Part 2


Here’s the current controller.


Fakebook discussion

PSU pinout
1678153619295.png

1678153664291.jpeg
 
Last edited:
Jennifer said:
BRAVO!!!!! That’s what this boards all about, creativity, well done.
Click to expand...
Agreed 100%. I'll do some more research and post updates when I start ordering. I'm planning to power it using my small inverter generator, 3kw will be just over 80% of its rating and give me ~50a @56v after efficiency losses. (it's crazy a year ago that statement would have been Greek to me, amazing forum!)
Jennifer said:
I spent my own share of time hunting chinese web sites to see who really manufactured that unit.
Click to expand...
As did I...
Jennifer said:
This will be fun to watch.
Click to expand...
And hopefully helpful to others in the future.

Your post above will be very helpful, thank you!

Edit for link to said generator https://wenproducts.com/collections...ducts/4000-watt-open-frame-inverter-generator
 
SignatureSolarJames said:
cool!!!

I thought that "chargeverter" was a reasonable name tho...
Click to expand...
I never thought it wasn't a reasonable and catchy name, had to come up with something different for the DIY side so there were no copyright issues ?.
The product you are offering truly is an amazing value for the money, I'm just stubborn, frugal and have way to much fun building things.
Heck I even wanted to DIY my inverter until I spent an hour on thebackshed and realized I'd probably end up under the shed...
 
42OhmsPA said:
I never thought it wasn't a reasonable and catchy name, had to come up with something different for the DIY side so there were no copyright issues ?.
The product you are offering truly is an amazing value for the money, I'm just stubborn, frugal and have way to much fun building things.
Heck I even wanted to DIY my inverter until I spent an hour on thebackshed and realized I'd probably end up under the shed...
Click to expand...
I love that
 
Jennifer said:
Wear that as a badge of honor, more people should be like you.... as an amateur radio operator that's the core to our hobby, or was... and that's what I love about solar.
Click to expand...
Thank you.
Interesting that's something else that has really peaked my interests recently (HAM). So much so that I ordered a cheap baofang and programmed local repeaters as well as a few NOAA frequencies with chirp. Don't worry I disabled transmit completely until I learn more and get my license, which I feel I should do sooner than later.
 
How do these used rectifiers compare with these programmable power supply/chargers from Meanwell?

These support CanBus, PMBus, programmable charge profile, and 0-5V analog control over charge current

HEP-1000-MEAN WELL USA Switching Power Supply

MEAN WELL Switching Power Supply. MEAN WELL is a Switching Power Supply manufacturer in Taiwan. – SMPS, SPS manufacturer, AC DC , DC DC , DC AC, industrial power supply, Medical power supply, Din Rail power supply, LED power supply, LED driver, charger, inverter, adaptor, rack power, modular...
www.meanwellusa.com

At first glance, the main difference seems to be price/performance, since these are $400/kW while the ones up-thread are $100 for 3kW
 
I used meanwell RSP-1000 and RSP-2000 in the past with great success. Those one are constant current limited and output 125%, so they are 1250W and 2500W charger. One other nice feature is they accept DC as input.
RSP series isn't seal as the HEP series, but they cost around $250/kW (well, $200/kW considering 125% output) new and I found a RSP-1000 for 100$ few years ago.
 
yabert said:
One other nice feature is they accept DC as input.
Click to expand...

You may want to expand on that statement before people start buying these based on your comment and don't have the minimum 250VDC required...... see second screen shot below. :)

1678820894576.png

1678821044336.png
 
These have a bridge rectifier of some sort. Running in DC means all the current goes through half of it. Derate accordingly like a grown adult ? . The double DC voltage compensates.

Or open it up and bypass the rectifier.
 
Jennifer said:
You may want to expand on that statement before people start buying these based on your comment and don't have the minimum 250VDC required.
Click to expand...
Oh! good find for the 2000w unit.
My only personal experiment in DC is with a RSP-500 I use as DC-DC converter inside my EV with a 180V nominal battery (165-195Vdc) since a decade.
Seem like the 1000w and 500w unit have the same DC input voltage of 127-370Vdc.
I'm now tempt to connect a RSP directly to my PV array ?

RSP-1000.JPG
 
yabert said:
I'm now tempt to connect a RSP directly to my PV array ?
Click to expand...
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?

My PV voltage is always around 165-185V (4 panels) and the HLG-320H is rated 127-431Vdc.
HLG-320.JPG
 
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