Bulk charging via digital DC-DC boost Minghe BST-900W

Batteries, Chargers, and Battery Management Systems.
tostino   10 kW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by tostino » Jul 13 2017 7:34am

And I got my flatpack2 from here for $50: http://www.ebay.com/itm/ELTEK-FLATPACK2 ... SwuxFY0eNM

markz   100 GW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by markz » Jul 13 2017 1:11pm

tostino wrote:And I got my flatpack2 from here for $50: http://www.ebay.com/itm/ELTEK-FLATPACK2 ... SwuxFY0eNM
Great price if the S/H wasnt too too high. For Canada its another $50USD, so $100USD total shipped, which is $130CAD, another thing is if you are using it at 220V outlet its great, but 110V outlet its derated. I'm not sure if its the 33A it states on the sticker, for some reason I thought it was closer to 20A which is why i discounted it for 110V outlet.

Looking for the 110V current output
http://www.eltek.com/photoalbum/view2/P ... iZ0eXBlPTE
Then if you search document for "110V/125V Systems" you will find
241115. 805B is 10A on 110V
241115. 805 is 15A on 110V
Good news is you can share current up to 8 units, or 80A(B model) or 135A (non B model)

It is interesting. Another one to look at is the HRP and RSP models.
https://endless-sphere.com/forums/viewt ... p#p1246231
The RSP are made for different purpose and have better resistance on vibrations and IP water resistance while the server power supply are made to be static... RSP serie from meanwell is one of the most tought power supply i have ever seen. Eltek offer now some of the most high power density ever acheived with the S serie from flatpack.. each brands have their pros and cons

Doc

tostino   10 kW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by tostino » Jul 13 2017 1:51pm

markz wrote:
tostino wrote:And I got my flatpack2 from here for $50: http://www.ebay.com/itm/ELTEK-FLATPACK2 ... SwuxFY0eNM
Great price if the S/H wasnt too too high. For Canada its another $50USD, so $100USD total shipped, which is $130CAD, another thing is if you are using it at 220V outlet its great, but 110V outlet its derated.
Wow that's some terrible shipping mark up. I had $12 shipping when I ordered in the US.

timmy66   100 mW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by timmy66 » Aug 22 2017 10:43am

Any suggestions for how to get this charger to cutoff at a specific low current rate? After the CC, CV, when the current under CV has dropped to C / 10?

Someone had mentioned a low current dropoff circuit above, any one doing that?

Thanks

jastill   1 mW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by jastill » Aug 30 2017 1:34pm

Is it known if this thing has a diode before the output, so that one isn't needed if charging a battery with it?

The manual says that it's ok to charge a battery - no mention of a diode. Just to disable the output (SET), and then connect battery, and then enable.

MasterCATZ   1 mW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by MasterCATZ » Nov 19 2018 1:53am

I used my DC BST900w Boost Converter to charge my e-bike , we had a storm this weekend that blew my bike away while the charger was still plugged in and pulled the charger into some water

now I thought I had dried it all but forgotten to empty out the water out of the socket of the controllers breadboard , so when I started it up the voltage kept creeping up until it hit max voltage and something zapped , I can not see any damage however , but it no longer outputs boosted voltage if I have 24v input it will not output 53v but will output only 24v @ 0 amps and has VO and CC LED lit , if I have 48v input ( 52 ish volts) it will just pass that through and show the current draw but will not limit the current or limit the output voltage , ideally all I need is a current limiter to get me out of trouble I keep the 13s lithium cells @ 53.3V and want to charge them @ 1a ( 4a Max )

any idea where I should start looking , if trying to boost from 24v to 48v ( 53.3v ) the constant Voltage LED lights up then goes immediately off
the circuit can still detect the voltage on the output side


these are cheap but I need a solution for charging my bike while I wait for a replacement

https://www.banggood.com/B900W-NC-DC-Co ... rehouse=CN

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Arlo1   100 GW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by Arlo1 » May 04 2019 9:50pm

need to read this
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
YSR build http://www.youtube.com/watch?v=BRo8r5g4NBg
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
http://www.undergroundelectrics.ca/

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Arlo1   100 GW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by Arlo1 » May 04 2019 10:42pm

Guys I want to boost 50V to 117V for a range extending pack for my Zeros. Think this will work?
Mine has 150v rated parts. Anyone notice the second spot for a second diode that's not populated?
Does your project need a high performance motor drive, battery charger or other power electronics developed? Let's talk!
www.powerdesigns.ca
Leaf motor controller build. http://endless-sphere.com/forums/viewto ... 27#p963227
YSR build http://www.youtube.com/watch?v=BRo8r5g4NBg
Never above 4.2v never below 2.7v EVER!!!
Support me on Patreon. https://www.patreon.com/user/posts?u=6842045
http://www.undergroundelectrics.ca/

GIGATT   10 W

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by GIGATT » Jan 07 2020 12:58pm

Greetings when these 900W DC-DC stop working, is it usually the mosfets?

If yes is it the bigger one or the smaller one?

I am on my second one technically; each time it is somewhat user error that caused them to fail. Ninja smoke can out of the first one. After I placed the unit on a metal surface while it was powered on.

I have had the last unit up to 600 watts charging at 40 Volts at 15 amps.

I would like to know their way to beef them up make them more reliable or what replacement part will I need to keep? I do not mind soldering.

Please advise... I will pay you

Thanks

jerome_speedy   10 mW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by jerome_speedy » Jun 03 2020 10:49am

I have several BST900 (2 in my solar shed to charge ebike batteries, another one to transfer energy in a more open way)
I noticed only 1 had the IXYS part, the other two were the inferior Fairchild reference.
I managed to bulk charge one of my batteries at 6Amp, the input current was like 12amp, and the BST 900 survived. Granted, I have populated the empty schottky rectifier slot with another identical rectifier, and was probably lucky too. But all of them are still working after 3+ years of service (2 of them having had everyday use or so). I have beefed up the traces with solder wire of course.

I found this one referenced on Mouser, if anyone wants to upgrade their BST 900:
IXFH170N25X3 , 250 V, 170A, 7.4 mOhms (half of the resistance of the original IXYS, way lower than the Fairchild rated at 28 (!!) mOhms)

Should be my next purchase for these devices, should any of them fail due to the FET heating too much. :bigthumb:

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Matador   100 kW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by Matador » Sep 20 2020 6:41pm

jerome_speedy wrote:
Jun 03 2020 10:49am
I have several BST900 (2 in my solar shed to charge ebike batteries, another one to transfer energy in a more open way)
I noticed only 1 had the IXYS part, the other two were the inferior Fairchild reference.
I managed to bulk charge one of my batteries at 6Amp, the input current was like 12amp, and the BST 900 survived. Granted, I have populated the empty schottky rectifier slot with another identical rectifier, and was probably lucky too. But all of them are still working after 3+ years of service (2 of them having had everyday use or so). I have beefed up the traces with solder wire of course.
Why did you add a second schottky diode ? Was it missing one component ? Wondering if this was on purpose for normal function or if they just cheaped out on part ...

Matador

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Matador   100 kW

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Re: Bulk charging via digital DC-DC boost Minghe BST-900W

Post by Matador » Sep 20 2020 7:21pm

Reversed heatsink mod.

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