Favorite DC-DC step downs for 48V system?

[MaximusAnonus]

What are everyone's favorite DC-DC step-downs for the 40-58.4V range and let's say 30W/50W/100W/150W/200W ranges?
Normally I would go with MeanWell as I always do but for the love of god I can't get my hands on many of the models (I use them at work and have really really good prices but they are simply out of stock).
Alibaba links welcome.

 

[JoeHam]

You didn’t say what voltage you want to end up with.

Assuming you want to step down to 12V I use something like this :

https://www.amazon.com/dp/B07MDZLT8H/

Those are to 12V but others are available. I use the 13.8V ones.

 

[MaximusAnonus]

Yeah my bad I want a few models that go to 12V and a few that go to 24V in different wattage.
Yes these are the most common chinese DC-DC stepdowns floating all round the web. I really wonder if their efficiency is 5-10% better than the MeanWells.

 

[BiduleOhm]

For MeanWell, 40 - 58 V input, 12 V output, 30 to 200 W, for example: https://www.tme.eu/fr/en/katalog/dc-dc-converters_100320/?mapped_params=2:339;36:1439179,1440877,1908388,1875633,1440877,1440906,1481945,1439185,1439185,1874864,1440901,1437073,1455099,1440919,1481956;364:1450066;624:1489712,1499763,1481941,1499769,1584853;

You can filter with the efficiency too

 

[MaximusAnonus]

For MeanWell, 40 - 58 V input, 12 V output, 30 to 200 W, for example: https://www.tme.eu/fr/en/katalog/dc-dc-converters_100320/?mapped_params=2:339;36:1439179,1440877,1908388,1875633,1440877,1440906,1481945,1439185,1439185,1874864,1440901,1437073,1455099,1440919,1481956;364:1450066;624:1489712,1499763,1481941,1499769,1584853;

You can filter with the efficiency too

Let's see. DDR-120B-12, 0pcs in stock, delivery in 31st week of 23. Also about 15% more expensive than what I can get from the local Mean Well dealer (which is also out of stock). DDR-240C-24, 0pcs in stock, delivery 24th week of 23. About 20% more expensive than my prices directly from Mean Well. OK something different let's say RSD-200C-24, 0pcs in stock, delivery 7th week of 23. About 20% more expensive.....
Yeah I see a pattern emerging here. ?

 

[Lt.Dan]

Daygreen.com has suited me well. They make every converter you could possibly imagine lol.

I have their 48v to 12v 100a converter. I dont use it anymore and am selling it too, if you need one ?

 

[BiduleOhm]

Let's see. DDR-120B-12, 0pcs in stock, delivery in 31st week of 23. Also about 15% more expensive than what I can get from the local Mean Well dealer (which is also out of stock). DDR-240C-24, 0pcs in stock, delivery 24th week of 23. About 20% more expensive than my prices directly from Mean Well. OK something different let's say RSD-200C-24, 0pcs in stock, delivery 7th week of 23. About 20% more expensive.....
Yeah I see a pattern emerging here. ?

I didn't check availability, my bad.

 

[MaximusAnonus]

Daygreen.com has suited me well. They make every converter you could possibly imagine lol.

I have their 48v to 12v 100a converter. I dont use it anymore and am selling it too, if you need one ?

95% efficiency
did anyone ever measured it?
if it's really 95% then I wonder why Mean Well and others can't replicate it

 

[John Frum]

48 -> 12
Victron Orion-Tr48/12-30(360W)

https://www.victronenergy.com/upload/documents/Datasheet-Orion-Tr-DC-DC-converters-isolated-100-250-400W-EN.pdf

24 -> 12
Victron Orion 24/12-70

Orion DC-DC Converters Non-isolated, High power - Victron Energy

Eliminate the need for a high current switch in the input wiring with the remote on/off connector on the Orion DC-DC Converter. Find a dealer near you.

www.victronenergy.com

 

[MaximusAnonus]

I'm not paying the Victron tax for a DC-DC stepdown lol.

 

[John Frum]

I'm not paying the Victron tax for a DC-DC stepdown lol.

The cheap ones have bed rep for failing lol.

 

[MaximusAnonus]

These Victron boxes are literally 3x the price of a similar Mean Well. And I would bet the Mean Well power supplies will outlive the Victrons. I will wait for the MW PSUs to get back in stock if the Chinese stepdowns are really that horrible.

 

[Lt.Dan]

95% efficiency
did anyone ever measured it?
if it's really 95% then I wonder why Mean Well and others can't replicate it

Hmm, I remember testing it, but I do not remember the results. It was something quite impressive though, and it worked very well.

 

[John Frum]

I like the SD-1000L-12
60 amps dc
output is adjustable 11-15 volts
input is compatible with both 24 and 48 volt systems
typical efficiency is 84%
In stock at digikey for $449.68CAD

Footprint is not compatible with a WFCO MBA though.

 

[John Frum]

The SD-500L-12 is footprint compatible with A WFCO MBA and available from digikey for $246.00CAD.

 

[John Frum]

The question I have is will either survive in a mobile environment?

 

[400bird]

You mentioned a pretty wide watt range.
For the lower end, I've used a couple of this brand. I've been running a 6 watt and 30 watt run for nearly a year straight now.

https://www.digikey.com/en/products/detail/cui-inc/PQAE50-D48-S12-DIN/13563296

 

[MaximusAnonus]

The question I have is will either survive in a mobile environment?

My brick house is a mobile environment?

 

[Daddy Tanuki]

You didn’t say what voltage you want to end up with.

Assuming you want to step down to 12V I use something like this :

https://www.amazon.com/dp/B07MDZLT8H/

Those are to 12V but others are available. I use the 13.8V ones.

The cheap ones have bed rep for failing lol.

Thats exactly what happened to me. I used the same thing that Joe posted, or so similar I cannot discern the difference and it died after a short period while powering my battery heating system. that to me is considered a critical load and when it went out I got lucky and the temps did not drop low enough to damage anything.

I'm not paying the Victron tax for a DC-DC stepdown lol.

I will know that I know they offer one. much better to be safe than sorry in regards to a critical component.

YMMV

 

[Daddy Tanuki]

These Victron boxes are literally 3x the price of a similar Mean Well. And I would bet the Mean Well power supplies will outlive the Victrons. I will wait for the MW PSUs to get back in stock if the Chinese stepdowns are really that horrible.

my personel experience they (Chinese ones) are that bad.