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Help in setting up multiple Opus BT-C3100 powered by a computer power supply
#11
(07-31-2020, 12:55 AM)floydR Wrote: The best course of action is NOT to hot plug equipment in, especially items not designed for hot plugging.
Just put the switch on the ac side ie the power cord of the ps.

It is safe to test out hot-plugging on any decent quality power supply. They are designed to gracefully handle overloading without damage to themselves or their loads.

(07-31-2020, 12:55 AM)floydR Wrote: https://www.youtube.com/watch?v=j7QuAuV5Xac
Build GIGANTIC Opus based charging station 

Not clear how that video is relevant since it says nothing about the power supply (or hot-plugging). He appears to be using a dirt-cheap generic (12V/30A) SMPS like those that are all over eBay. These are power-supply analogs of "20000mAh" 18650s - typically way overspec'ed, very low quality (and some are even serious fire hazards).

I strongly recommend against using them. Instead for the same price (or often less) you can get a refurb top-tier power supply that will likely outlive you. A popular choice in the RC community are server power supplies, e.g. the 12V/47A HP DPS-600 (made by Delta). There are many such refurbs available from top-tier PC ODM/EMS/ECMs such as Delta, Flextronics, Hipro(Chicony), Seasonic etc, easily found on eBay at good prices.

Another option is to go with top-tier industrial power supplies, e.g. those from Phoenix, Puls, Siemens, Omron, Cisco Ascom, Cosell, TDK-Lambda, XP Power etc, many of which can be found for 10 to 100 times less than street price on eBay.

There is no reason to buy a generic junk power supply when great deals on high quality supplies are ubiquitous.

Note: it is possible that the power supply in the video is a MeanWell (a decent middle tier choice), since their cases look similar. But those are often cloned so one has to be careful buying them. There are no such clones of said top-tier supplies, so that is one less worry.
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#12
(07-30-2020, 02:46 PM)side Wrote:
(07-30-2020, 01:45 PM)floydR Wrote: I haven't experienced this but sounds like the switch has a short in it when switched off. if the power supply has a switch use that. or install a switch on the ac cord. The switch is designed for ac my guess is that it arcs when switched off and the arc trips the power supply.
later floyd

Thanks floydR. You were spot on. The switch was the problem. The PSU doesn't have a switch, so I connected directly. I will look for a DC switch.
Just move the ac switch from the dc side to the ac power cord and see if it helps.

No need to buy anything else, and if it works problem solved. If it doesn't work you are out nothing.
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#13
^^^ Of course that will work (if inrush is the problem) but it doesn't allow you to switch on/off individual chargers. So if one charger is hanging and needs a power cycle then you have a problem if others are running long programs so can't be shut down. And its much better for longevity if you only power on the devices that you actually need (vs. all of them).

Not to mention its a real PITA when you later forget that you can't hot plug, and then do so and lose all your work on other running devices. So if you go that route then construct it so that it is not easy to make that mistake. But better to get a power supply without that limitation (Dell DA10s can often be has for < $10 on eBay)
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#14
Agreed, That is why I use a power bar to power my Opus's and the precharger/post discharge charger. Even have an Old Computer powerbar that has individual switches for each outlet think I used it forthe C=64. although most power bars don't trip when you unplug/plugin a original ps from an opus.
I was trying to help solve the OP problem. Enjoy most of your posts, even though I might not understand fully what is posted.

Later floyd
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#15
Floyd and Gauss, thanks alot for these replies. I am learning something new.

(07-31-2020, 12:55 AM)floydR Wrote: https://www.youtube.com/watch?v=j7QuAuV5Xac
Build GIGANTIC Opus based charging station 
This video was one of my inspiration to building my charging station. If you notice, he has only one switch which is what I wanted to mimick.

(07-31-2020, 01:54 AM)gauss163 Wrote: I strongly recommend against using them. Instead for the same price (or often less) you can get a refurb top-tier power supply that will likely outlive you. A popular choice in the RC community are server power supplies, e.g. the 12V/47A HP DPS-600 (made by Delta).
I will look for one of these in my neck of woods

(07-31-2020, 01:54 AM)gauss163 Wrote: There are many such refurbs available from top-tier PC ODM/EMS/ECMs such as Delta, Flextronics, Hipro(Chicony), Seasonic etc, easily found on eBay at good prices.

There is no reason to buy a generic junk power supply when great deals on high quality supplies are ubiquitous.
In my neck of woods (Nairobi, Kenya), ebay and Amazon are not an option. To give you a sense of this, everything on that charging board, except the switches, PSU and cables, is bought from Alibaba (yes Chinese version of AliExpress) and Banggood. The minimum waiting time is 2 weeks and can be as long as 2 months. I have learnt to work with what I get. The logistics are another nightmare.

(07-31-2020, 02:39 AM)gauss163 Wrote: ^^^ Of course that will work (if inrush is the problem) but it doesn't allow you to switch on/off individual chargers. So if one charger is hanging and needs a power cycle then you have a problem if others are running long programs so can't be shut down. And its much better for longevity if you only power on the devices that you actually need (vs. all of them).
This is a really good suggestion thanks. i will definitely put some more switches, probably on the AC side and a proper DC switch as well as suggested by Floyd also.

Just to mention, I have plugged the charging board to an Uninterruptible Power Supply (UPS) unit, since our power utility company is the definition of a joke of a utility company. Power fluctuations, load shedding, "dirty" power are the norm here and in multiple times I have lost over 6 hours of parallel testing using the Opuses before this board.

The UPS provides me a master on/off switch for now. Since it works for now, I will use it and make the improvements down the line.
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