What do u charge with and are these ok?

[nalu808]

I am looking for a variable voltage charger that won't break the bank. I have packs ranging from 4s to 20s and dont want to have many individual chargers if possible. What are your thoughts on the chargers in the pics? Or do u have recommendations for one.

 

[thebes]

Regarding the ones in the images, I wouldn't particularly recommend any of them as they are somewhat pricey for what they are. Generally you want to look for something based off a nicer inverter/psu, preferably huawei, delta, and the like. I've got two of these, specifically the 120v25a version, and they work perfectly fine, do the ~3kws each without much issue. They are repurposed delta dpr 4850 dce which is a pretty solid rectifier and is pretty affordable.

 

[nalu808]

Regarding the ones in the images, I wouldn't particularly recommend any of them as they are somewhat pricey for what they are. Generally you want to look for something based off a nicer inverter/psu, preferably huawei, delta, and the like. I've got two of these, specifically the 120v25a version, and they work perfectly fine, do the ~3kws each without much issue. They are repurposed delta dpr 4850 dce which is a pretty solid rectifier and is pretty affordable.

Thanks for the reply. The one in your link looks good.

 

[dominik h]

I also have one of the modified Delta rectifiers. I bought a 0-140V/30A Version.
Efficiency is not the best. I measured a full load efficiency of 89%.
They are a bit noisy under load, because they only have two fan speeds.

Mine charges only with 2,8kW.
Probably someone has set an input current limit over the CAN bus.

 

[thebes]

I bougha 0-140V/30A Version.

I didn't even realize they sell a 30a 140v version, only seen 15a, bit odd as well since the rectifier only does ~3kws :/

Efficiency is not the best. I measured a full load efficiency of 89%.

I get ~95 at 116v25a output with 240v input, it'll be a decent bit less if you're charging off ~110-120v and have to then buck it up.

They are a bit noisy under load, because they only have two fan speeds.

Haha yeah, I should've probably mentioned this, they are telecomme inverters at the end of the day

 

[dominik h]

I didn't even realize they sell a 30a 140v version, only seen 15a, bit odd as well since the rectifier only does ~3kws :/

It was from a different seller from aliexpress. I was looking for one which can charge every battery I might think off in the next years.
So I can charge 48V with 30A or 140V with 20A.
actually I have 8S lifepo 15S lifepo 21S Li-Ion, next build will be 28-30S Li-Ion.

I get ~95 at 116v25a output with 240v input, it'll be a decent bit less if you're charging off ~110-120v and have to then buck it up.

Original peak efficiency was 91,5%.
I do not think the chinese modifications will level up the efficiency.
The modded Huawei R4875G1 makes around 95,5% Efficiency under full load. But that has double the price.
Mine is running from 230V mains.
From 110-120V you only get half the power.

Haha yeah, I should've probably mentioned this, they are telecomme inverters at the end of the day

Yea like all the other reasonabled priced ones with long life, active pfc correction and good efficiency.

If I was able to do the mod myself, I would mod my Elteck Flatpack 48/3000 SHE. Peak efficiency is here 97,8%, or one of my Vertiv R48-2000E3, 1,13kg with 2kW output power, or the smaller Flatpack S 48/1800 with 0,85kg.