70V-ish PSU advice

Archive of useful information. This is not a discussion area.
Post Reply
drebikes   100 W

100 W
Posts: 176
Joined: Jun 22 2013 11:08am
Location: Northampton

70V-ish PSU advice

Post by drebikes » Jan 23 2022 9:09am

Hi all,

I'm looking for a AC mains to DC power supply of about 70V (min 66V) to power a 360W FRNSI DC6006L adjustable PSU. I'm not sure what is the maximum it can take, need to open it up, but spec says 70V. I have to assume it has 80V caps, but I'll check.

After googling, ebay and alibaba, looking at the prices of what is labeled as PSU, I was disapointed in the pricing - even if they offer more settings than I need. Now I'm focusing on 16-17s 4.2V chemistry battery chcargers. There are of course lots of possibilities, but I'm not looking at professional stuff, quite the opposite. I'm looking for ideas, thoughts advice, my level is amateur electronics diyer.

No need to click on the links below, that are some non-crazy things I think might work, but not sure. Here's some things I found:
*https://www.ebay.com/itm/383760177980?h ... Sw54NduoGU seems it might do the job, but there's no isolation between input and output stage that I could detect
*https://www.ebay.com/itm/234167124238?h ... Sw~hNdJrBu a 17s battery charger
*https://www.ebay.com/itm/353558615336?h ... SwuChg38BM much cheaper but 16s battery charger

Since I only need a constat DC feed, are battery chargers my best shot?

Cheers from polar Scandinavia

dominik h   100 W

100 W
Posts: 224
Joined: Jul 24 2021 2:12am

Re: 70V-ish PSU advice

Post by dominik h » Jan 23 2022 12:30pm

A battery charger turns off after charging is finished.

Just buy two 36V LED sources like meanwell elg or hlg nd put them in series.

drebikes   100 W

100 W
Posts: 176
Joined: Jun 22 2013 11:08am
Location: Northampton

Re: 70V-ish PSU advice

Post by drebikes » Jan 23 2022 2:01pm

dominik h wrote:
Jan 23 2022 12:30pm
A battery charger turns off after charging is finished.

Just buy two 36V LED sources like meanwell elg or hlg nd put them in series.
Thanks dominik, that looks like a great shout. When they say 36V, I suppose they actually mean 36V, not some weird range like for li-ion cell packs, right?

john61ct   100 GW

100 GW
Posts: 8630
Joined: Dec 18 2018 2:06pm

Re: 70V-ish PSU advice

Post by john61ct » Jan 23 2022 2:10pm

Yes, for LI chemistries the distinction between a PSU and charger is the auto-termination of the charge cycle based on a "smart" judgment of the target battery being Full.

Without that there is greater risk of harm, reduced longevity from overcharging and even fire.

A great charger example is Grin Satiator

#7205 "36V-84V" outputs 20-103V, 4-5A (360W)

About $300

...

If you know of a reliable (not cheap Chinese) HVC circuit, your FNIRSI DC6006L PSU will perhaps be just as good.

2x Mean Well HLG-240H-36 in series as input.

But by the time you're done how much money saved.

Kluge of components cobbled together rather than all in one.

And lower reliability, shorter lifespan.


> no isolation between input and output stage

Why do you think that's needed, on your final output unit?

dominik h   100 W

100 W
Posts: 224
Joined: Jul 24 2021 2:12am

Re: 70V-ish PSU advice

Post by dominik h » Jan 24 2022 6:14am

Meanwell HLG or ELG 36 means 36v at the output. And it is also adjustable in a small range.

john61ct   100 GW

100 GW
Posts: 8630
Joined: Dec 18 2018 2:06pm

Re: 70V-ish PSU advice

Post by john61ct » Jan 24 2022 2:28pm

dominik h wrote:Meanwell HLG or ELG 36 means 36v at the output. And it is also adjustable in a small range.
The point is, two in series to act as a 70V source feeding the OP PSU.

Adjust from 36V to 72V ,not so small

https://www.meanwell.com/Upload/PDF/HLG ... H-SPEC.PDF

But my reco is the Satiator.

m3vuv   100 W

100 W
Posts: 109
Joined: Nov 16 2017 6:08am
Location: horncastle lincs uk

Re: 70V-ish PSU advice

Post by m3vuv » Sep 12 2022 4:35am

most 36v chargers,eg10s normaly output 42v,ive used 2x 36v chargers in series a few times to charge a 20s pack.

Post Reply