In this case I would think that converter in post #8 would work supplying the 360Vdc

 

In this case I would think that converter in post #8 would work supplying the 360Vdc

It worked but only around 25v at the output, and the if 3845 has no pwm output
I think need some voltage at the socket of on/off so the charger turn on

 

They are the same

MisterBill2’s assertion is that even batteries of the same type are never truly identical. While a series of batteries of the same type may appear identical, there will inevitably be slight variations from one battery to another. These variations can manifest as slightly higher internal resistance in some batteries compared to others. Consequently, one battery may charge more quickly than another, while others may charge at a slower pace. Given the large number of batteries in a string, it is possible for certain sections to overcharge while others remain undercharged. Overcharging a battery can lead to a faster depletion of its capacity.

In 1982, I was responsible for servicing large systems that utilized multiple Ni-Cad batteries (1.2V @ 50Ah each) in 36-volt systems. Regular battery maintenance, including washing, is essential. We scheduled battery washes every six months, during which deposits would accumulate on all or most of the terminals. This necessitated disconnecting each battery and cleaning the acid residue from the terminals, a time-consuming process that frequently resulted in ruined blue jeans.

 

Okay, I've connected external 5v and 12v at the chgr on/off socket and it powered the board

Thanks for your help

 

This may be a repeated warning, but charging a sting of batteries to anything close to 360 volts presents not only a shock hazard, but also a serious chance of a whole lot of amps for quite a few seconds. We could get 100 amps from the 7.2 amp-hour batteries for over a minute.

 

Interesting way to think of it - - - 360V x 100A = 36,000W. And that's DC voltage. Make contact with that and you're going to get a hugely serious burn. The biggest system I worked with was 32VDC @ 50Ah. Imagine all that amperage at once - - - 32V x 50A = 1,600W. The battery cabling on that system was around "Single Ot" gauge. And that's only 32 volts.

 

Interesting way to think of it - - - 360V x 100A = 36,000W. And that's DC voltage. Make contact with that and you're going to get a hugely serious burn. The biggest system I worked with was 32VDC @ 50Ah. Imagine all that amperage at once - - - 32V x 50A = 1,600W. The battery cabling on that system was around "Single Ot" gauge. And that's only 32 volts.

Actually, that kind of power will evaporate the wrench out of your hand! No Fun At ALL!!

 

360VDC ? ? ? Unlike any UPS I've ever dealt with. ALL mine have a 12V battery inside them. They sit on my desk tops. When power drops out the UPS Board switches to delivering the needed AC. In my case it's 120VAC. In your case 240VAC (or as some people refer to these voltages as 110 and 220 volts AC).

Here's what I know, which might not apply to your system if it truly needs 360VDC: Mains power (110 or 220) the UPS charges and keeps charged a 12 volt battery. When power fails or is interrupted the UPS almost instantaneously switches to backup battery power inverting 12 volts DC into (in my case) 120 volts AC and supports the computer and anything else I have plugged into the UPS.

These are quite common. The 12/24 volts units have a transformer to step up the voltage, these units do not. The 360 volts is straight PWM'd to get a sine wave that feeds the load. The whole unit is floating and the isolation is in the 360 volts battery charger.

 

For the high wattage UPS it makes sense. Consider that the TS has a 20KW ups system, not a 200 watt system. A 20 kva TRANSFORMER IS HEAVY, and that would make the UPS occupy most of a full size rack that would require a fork lift to move. It also means that the system costs enough to make it worth repairing.

 

This may be a repeated warning, but charging a sting of batteries to anything close to 360 volts presents not only a shock hazard,

The batteries are connected to a charging board not directly to 360 volts.
The charging board requires an input of 360 volts according to the TS.

 

The picture you posted is more like the inverter part of the UPS.

Hello everyone here, greetings for all
Well, I have this UPS battery charger board, " this is one is broken and I'm working on fix, but I just show here for understanding" View attachment 340790normally it's installed in UPS machine, 20kva capacity, and 3.5A charging capacity
What I need do, is to take this board outside the UPS and charge the batteries
It takes DC in plus/minus which is I think it's the DC bus in UPS
and output DC plus/minus for batteries terminals
I need power by electric cable from 220v ac, 50 Hz,
What I know is that I need approximately 360v dc at input and that's all
What are your ideas for get 360v dc to power this charger?, hopefully with a range of 300-360v
Regards
View attachment 340789
btw:
hello my friends , here is edit to the post for more clarification for what i need

View attachment 341412

ive tried to put as much details as i can so you can have better view and understanding for the board, and you can see above the on/off socket, and charger detect socket,
normally these two sockets are connected to another board in the UPS , for turning on and off the battery charger and for detecting the batteries voltage " 16 battery in series " " 16*12v = 192v "

what i want to do is to power on that board without connecting to the other board in UPS

here is more information :

View attachment 341413


here also :

View attachment 341414

how can i power this board?
regards

The picture you posted is more like the inverter part of the UPS.

 

Really, a mains powered power supply delivering 360 volts DC could easily just be a normal transformer-rectifier-regulator supply. It will not need to be a switching mode supply even, since the load is fairly constant. You might even get away with just providing the float charge voltage, depending on how often the UPS actually needs to deliver full power.

So there is a question: How often does it need to supply power, and for how long at a time.
Your system design may have become simple and easy!!

 

So there is a question: How often does it need to supply power, and for how long at a time.
Your system design may have become simple and easy!!

For about 1hr, we will use for just raising battaries voltage a little bit up

 

The picture you posted is more like the inverter part of the UPS.

No it's a DC-dc converter used for charging battaries in UPS

 

IF that DC to DC converter is working, just what is the problem?? If it is not working, that IS a serious problem. At that point it becomes a question about repairing or replacing the charger. There ARE companies that design and sell custom charging systems, I can recommend one of them to avoid working with. But if the required charging specifications are known, then it should be possible to purchase new DC power supplies, from an honest supplier!, that can provide the specified charging power.

 

IF that DC to DC converter is working, just what is the problem??

It's working, but I want to use outside the UPS, so it not work and I need to make it work
No need for repair as it's already working
By the way I've found way, I used external 12v and 5v with ground at the on/off socket and it worked