3000 watt 48v 120vac Charger, Generator Friendly

[kennedy101]

In search of a generator friendly 120vac powered charger for a 48vdc battery. Looking for 3000watt or around 50amps. Best option I’ve found so far is two Aims chargers, but that’s around 2200watts at around $450. Suggestions? Open to a DIY project w instructions/guide.

 

[42OhmsPA]

Welcome to the forum.

Two of these will get you there.

https://www.aliexpress.us/item/3256807810993625.html

I went with the 57V version.

This thread will guide you.

Thread 'DIY 'Chargenectifier''

Mar 6, 2023

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...

• 42OhmsPA
• Replies: 903
• Forum: Danger Zone! (Advanced User Experiments Only)

• 
• 

 

[kennedy101]

Welcome to the forum.

Two of these will get you there.

https://www.aliexpress.us/item/3256807810993625.html

I went with the 57V version.

This thread will guide you.

Thread 'DIY 'Chargenectifier''

Mar 6, 2023

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...

• 42OhmsPA
• Replies: 903
• Forum: Danger Zone! (Advanced User Experiments Only)

• 
• 

Took a few days to digest. Thank you for the link. Two modules are enroute. A few questions below if you're inclined.
1) Other than connecting the output of the two modules in parallel are there any other connections required, IE a sense lead?
2) If I use a raspberry Pi or other linux OS with the canbus module, canbus software, correctly send the device serial number, should i be able to set the current output and possibly modify the output voltage?

 

[42OhmsPA]

Took a few days to digest. Thank you for the link. Two modules are enroute. A few questions below if you're inclined.

You're welcome.

1) Other than connecting the output of the two modules in parallel are there any other connections required, IE a sense lead?

I don't think so, I only ordered one of them.

2) If I use a raspberry Pi or other linux OS with the canbus module, canbus software, correctly send the device serial number, should i be able to set the current output and possibly modify the output voltage?

Absolutely, I never got around to programming them, I just turn it on and let it run for a x hours then turn it off. Eventually I'll likely work on programming them when I get really bored.
@upnorthandpersonal was a huge contributor to that thread and did a lot with "talking" to the Emerson to program it. I'm hoping he chimes in with more info here.

 

[kennedy101]

You're welcome.

I don't think so, I only ordered one of them.

Absolutely, I never got around to programming them, I just turn it on and let it run for a x hours then turn it off. Eventually I'll likely work on programming them when I get really bored.
@upnorthandpersonal was a huge contributor to that thread and did a lot with "talking" to the Emerson to program it. I'm hoping he chimes in with more info here.

This looks to be a good guide to make the Emerson/Vertiv Rectifier more generator friendly. Of interest are the "walk in" and "diesel AC input current". Looks like one could force the module to limit itself to say 13amps in my use case (3600 running watt generator, two modules at 120vac). The rectifier then intelligently adjusts its output current to stay at or under 13amps. The walk in value looks to define a time frame to ramp up the output voltage, which I assume would allow the generator to better throttle to heavy loads rather than slamming it with 3000 watts demand.

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

 

[OffGridInTheCity]

I use/recommend an EG4 Chargeverter 48v in 120v mode (3000w max in 120v mode) for both my powerwall and my camp trailer - https://eg4electronics.com/categories/chargers/eg4-chargeverter-gc/ These accept 240v or 120v AC input. There are several good youtubes and discussions about chargeverters on this forum for more info.

These are great as they let you set the amps so you can match the max output of more than 1 type of generator.