Hey guys,

I need to get anywhere between 12v to 24v DC @ ~40amps. All the power supplies I can find are $100+ ....

I need this to power a large 1500w CC/CV boost converter to charge a large lithium ion battery pack which will be going thru its BMS.

I've been keeping my eyes open for even a used server power supply etc... But again haven't found anything under $100 but normally a lot more.

I don't know how clean the DC needs to be going into the boost converter but...

I wasn't sure if it would be as simple as going through a transformer or bridge rectifier then into a large coil and some capacitors and what not. Or maybe modding a smaller psu to handle the current

Just trying to save money on this project since I'm already got too much into it.

Thanks

 

Not sure how clean it needs to be for battery charging but single voltage SMPSs are pretty cheap.
Such as:
https://www.ebay.com/itm/750W-Watt-...eon-100-240-/173924569167?hash=item287eb6504f

 

There are plenty of Dell/HP server PSU @ 500 - 700W each on ebay.com for around $30 each. You're honestly not going to do it cheaper if you want 1200 - 1500W @ 24v. There's a listing there now for HP 750W @$20ea

 

@Irving
@SamR

Oh sh*t. Thank you. Exactly what I was looking for @SamR

I've searched a few times and only found cheap options from China on ebay.

That's what I need. Thanks again guys

Just found this mamajama...
AMAZON HAS HP 750w for $17!!!

 

Not sure how clean it needs to be for battery charging but single voltage SMPSs are pretty cheap.
Such as:
https://www.ebay.com/itm/750W-Watt-...eon-100-240-/173924569167?hash=item287eb6504f

Server supplies are pretty clean and standard fare for this application. I use a couple of Dell 1200W supplies to give 24v 100A into two PL8 multichemistry chargers to charge two 5kW LiFePO4 packs @ 40A each...

 

@Irving
@SamR

Just found a HP 506821-001 750Watt on Amazon Prine for $17!!! "Used like new"

Idk why these didn't come up before

 

SMPSs get a bad rap but every critical computer runs on one. Maybe not as suitable for a research-grade electronics lab when looking for a mV or uV supply but I use them to supply my HF XCVRs and Amps. Suitable and value-priced depending on use. Plus there is a LOT of them available surplus for a very good price.

 

SMPSs get a bad rap but every critical computer runs on one. Maybe not as suitable for a research-grade electronics lab when looking for a mV or uV supply but I use them to supply my HF XCVRs and Amps. Suitable and value-priced depending on use. Plus there is a LOT of them available surplus for a very good price.

I use a modified SMPS for a variable 0-50v, 25A bench 'lab' supply. It is a little noisy on the output but the 80 - 120kHz switching is easy to clean up with an LC filter (much easier than if it were 100Hz hum from a linear regulator).

 

Yup, I just ran into a situation where I needed a 3rd PSU and thinking I might just have to do a conversion job on one of the junk computer SMPSs I have to fill the bill. But I also have a couple of dish tubs full of wall warts to chose from. LOL

 

You can never have too many PSU! I picked up a useful 4-channel linear bench supply on eBay for £90 ($120) (Instek PS4303) - used and ch2 voltmeter is a little flakey (probably a dry joint, it is 20y old after all!).