DC step-down for USB 60v input

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SportBiker   10 mW

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Joined: May 09 2018 4:24pm
Location: Santa Barbara, CA USA

DC step-down for USB 60v input

Post by SportBiker » Aug 30 2018 8:08pm

I am finding a lot of converters for under 36v but not 48v.

I tried the forum search (not very hard but did look).

Can anyone point me in the right direction for cheep USB supply that can accept 60v input?

Thanks

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wturber   100 kW

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Re: DC step-down for USB 60v input

Post by wturber » Aug 30 2018 9:18pm

This is the one I'm using. Max input voltage is 60v, though I'm using it on a 36 volt system. It is fully potted.

https://www.amazon.com/gp/product/B0151 ... UTF8&psc=1
"Commuter - DC Booster"
Iron Horse 3.0 hardtail - 48V / 1000W / 470rpm generic Chinese DD Hub motor (ebay)
8 x 36v 4.3ah 10s 2P battery packs - 1500W 30A DC Boost Converter delivers 54v and about 1000 watts peak
53T/42T Sakae Road cranks - 30mph+ on flats
viewtopic.php?f=2&t=90369

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wturber   100 kW

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Posts: 1328
Joined: Aug 23 2017 8:52pm
Location: Fountain Hills,AZ
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Re: DC step-down for USB 60v input

Post by wturber » Aug 30 2018 9:20pm

Oops. You are looking for 5v. Try this.

https://www.amazon.com/SMAKN%C3%82-Conv ... R34G046K1P
"Commuter - DC Booster"
Iron Horse 3.0 hardtail - 48V / 1000W / 470rpm generic Chinese DD Hub motor (ebay)
8 x 36v 4.3ah 10s 2P battery packs - 1500W 30A DC Boost Converter delivers 54v and about 1000 watts peak
53T/42T Sakae Road cranks - 30mph+ on flats
viewtopic.php?f=2&t=90369

SportBiker   10 mW

10 mW
Posts: 22
Joined: May 09 2018 4:24pm
Location: Santa Barbara, CA USA

Re: DC step-down for USB 60v input

Post by SportBiker » Aug 30 2018 10:40pm

Thanks.
That seems better than this: https://www.amazon.com/GERI-Converter-M ... 00W52N8XW/

I do wonder if the full charge voltage of ~54.6 is an issue for something that claims it can take 50.

dustNbone   10 kW

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Posts: 619
Joined: Mar 13 2016 9:59pm
Location: Vancouver, BC

Re: DC step-down for USB 60v input

Post by dustNbone » Sep 01 2018 7:39am

Many "Wall Wart" switching power supplies will work just fine on 50+VDC, no need for anything special. I'd say 80% of the AC USB chargers I've tried have worked perfectly normally on DC. Sometimes you have to try polarity both ways but the ones that have worked have continued to do so without problems.

Just a bit cheaper/more available solution, most people have a collection of these laying around.

FWIW, I have one of these mounted on my bike. Wasn't one I had lying around but it worked on DC and I liked the form factor.

https://www.ncix.com/detail/linke-qualc ... 128564.htm

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