Greetings,
I was thinking that in UPS(inverter) the automatic connection/disconnection of the battery charging works via relay(electromechanical) or Mosfet based in today's modern type system,
what actually gets connected(shorted) the positive(+) or the ground(-); in ac mains let say the neutral or the live(phase)?
Above query solved...

 

1) nobody could guess without a model number.
2) you don't have to disconnect a battery charger to stop it from float charging the battery 24/7.
3) therefore, it probably doesn't get disconnected.

 

its not about model number its about the working i want to know

 

Do you think every manufacturer does it the same way?

 

Do you think every manufacturer does it the same way?

I don't know how manufacture do it I m just asking what is the best suitable way

 

But your first post asks, "What is the actual way?"
Depends on the manufacturer.
In my opinion, the best suitable way is: the float charger probably never gets disconnected.
I run my lawn mower battery that way. I have kept a truck in storage for a year with that method, and it works. The batteries don't sulphate and they are always ready for work, which is exactly the definition of what a UPS needs.

 

But your first post asks, "What is the actual way?"
Depends on the manufacturer.
In my opinion, the best suitable way is: the float charger probably never gets disconnected.
I run my lawn mower battery that way. I have kept a truck in storage for a year with that method, and it works. The batteries don't sulphate and they are always ready for work, which is exactly the definition of what a UPS needs.

Alright, that means battery never gets disconnected and that is done because to maintain battery life?
if for example u want to charge the battery for a typical level of 13.5V such that when it attains that level it disconnects .... so what should be cutoff(positive or negative) of the charger in UPS to disconnect the circuit when battery not in use?

 

so what should be cutoff(positive or negative) of the charger in UPS to disconnect the circuit when battery not in use?

Either method would work.

 

Either method would work.

As to why majority prefer it to be positive?? Does that anything to do with the efficiency or something else?

 

It's easier to do the math in your head when you use positive numbers.

 

If you disconnect the battery from an Uninterruptible Power Supply, wouldn't that defeat the Uninterruptible part?

 

If you disconnect the battery from an Uninterruptible Power Supply, wouldn't that defeat the Uninterruptible part?

Ahan, thanks now I got it....

 

No, not at all. Because battery is the most important thing in the UPS