[S_U_N]

Originally Posted by sourav9385

We do this in the morning before leaving. So, when electricity goes off the inverter doesn't switch on.
When we come back in the evening, we turn on both the switches.
Thus re-enabling automatic switch over to the wired rooms.

Now comes the confusing part.
The daily 2 hour power shutdown in our area, happens between 8:00 AM & 6:00 PM.
So on the weekdays, we are never at home when the power shuts down.

I think you are doing what you can.
Actually in your current setup, you need a mechanism to bypass the inverter completely, since there are no power cuts at all.
Perhaps the inverter is designed to take into consideration this scenario.
What does the manual say?

[Aroy]

Most of the inverters work in the "Off Line" mode, that is
. Main power is fed straight to the load bypassing the inverter using a relay
. When power goes, the relay now disconnects the above circuit and the load is connected to the inverter output.

It is only in the "On Line" UPS that the load is always fed through the UPS. This is to
. Ensure that there is power to critical devices, which cannot tolerate the few tens of milliseconds it takes for the power to be rerouted by the relay
. Always supply conditioned power to the load.

[S_U_N]

Some pricing that I got from a local dealer:

Sukam Sine Wave inverter

800 VA: Price: 7000

1500VA:Price: 9500 - This requires 2 batteries :(
To reduce budget I was suggested to go with 2 batteries each
60Ah battery (Autobat, 5 yr warranty): Rs 6000/-
OR
80Ah battery (Autobat, 5 yr warranty): Rs 7000/-

If budget is more then,
120Ah battery (Autobat, 5 yr warranty): Rs 9500/-

These costs includes basic installation and 2 year of free top up.

My requirement is to have:
1. Protection from spikes/ voltage fluctuation.
2. Sine wave - to protect the plasma and other sensitive loads.
(Besides I don't like the humming sound.)

Load:
1. Plasma: 350W (with full brightness). I would factor in another 50W for safe margin
2. Speakers, STB, some future addition: 100W

Above load back up time requirement is just 5 minutes. I don't need to watch TV when power goes off.

3. Fans: 5 (only 2 may be operational at the same time)
4. Tubelights: 1
5. CFL: (11-22 W) - 4

Above load back up time requirement is 2 hours.

Will 800VA inverter suffice?

One problem with Sukam 1500VA inverter is it needs two batteries (hence added cost).
Another problem is that I do not have space to keep two batteries in the balcony.

Will 1500 VA inverter increase running cost?

[aim120]

The 2 battery inverter which works on 24v DC are more efficient they have a higher power factor.The main drawback of 2 battery inverter is the cost of batteries a 120ah single battery is cheaper then 2 x 60ah batteries.

[deetee]

Got installed all amaron setup.
Pricing:
UPS 875VA: 5400
battery 150AH MF: 7800
Steel trolley(iAce) : 900

Installed it close to a window which is always open.
No electronics on load, they are on a separate older but troublefree no name UPS

[S_U_N]

For my unbranded 500W inverter, I was considering a 120Ah battery - tubular.

Autobat, Eseries, 5 yr warranty (2 year replacement), best price I have got is Rs 7700.
The dealer has a 1 month old 150Ah battery (old stock) at pre-hike price. Price Rs. 8400.


Which one is better?

Edit: 1 will get 1500 Rs. for old 130Ah battery.

[S_U_N]

I spoke to Autobat customer care this morning.
According to the information, TUBPOWER is the best tubular battery they have.
INVAPOWER and ESERIES will give 20% less than rating.
So, 150AH will be equivalent to 120AH in terms of backup.

So, the earlier price of Rs. 8400 is effectively for a 120AH equivalent battery.

I am thinking of going ahead due to lower up front cost.

[saket77]

Hello Bhpians!

I am looking for a small UPS for keeping my LED Projector powered up for the time period between the power cuts & until generator supply is restored. This downtime is generally not more than 1-2 minutes. I planned to get a simple 600 VA APC computer UPS, but having doubts if I need a sine wave UPS? Some friends advise that I need a sine wave ups for my Home Theatre system. What exactly a sine wave UPS is and is it necessary for my purpose?

Please enlighten!

Thanks,
Saket

[Arch-Angel]

Originally Posted by saket77

What exactly a sine wave UPS is and is it necessary for my purpose?
Please enlighten!

Hi Saket, For understanding what a sine wave inverter/ups is, you need to understand what a sine wave is. A sinusoidal waveform is the one we get in our power outlets at home.



It has an Amplitude value of 240V and frequency of 50Hz. Normal inverters use different types of transistor/firing circuits to replicate this sine wave from the dc power stored in batteries. This includes circuits like H-bridge to do the inversion process. Their output isn't sinusoidal. Rather, it would be a triangular/stepped wave/sawtooth/square wave. This is not suitable for all components and especially power supply circuits will take a hit because of the same. This is why sine wave inverters were realised.

Sine waves: They are more suited for all electrical/electronic applications since most applications are designed to run on AC. I could explain it in detail if you want, with illustrations of firing angles and waveforms on how it is done.

Here is a link illustrating why must a sinusoidal inverter be used.

Link: Why do you need Sine wave inverter/UPS

Conclusion would be that, for all electrical/electronic components, get a sine wave inverter only.

[bhp_maniac]

Originally Posted by saket77

Hello Bhpians!

I am looking for a small UPS for keeping my LED Projector powered up for the time period between the power cuts & until generator supply is restored. This downtime is generally not more than 1-2 minutes. I planned to get a simple 600 VA APC computer UPS, but having doubts if I need a sine wave UPS? Some friends advise that I need a sine wave ups for my Home Theatre system. What exactly a sine wave UPS is and is it necessary for my purpose?

Please enlighten!

Thanks,
Saket

It is better to have a Sine wave inverter for sensitive loads. I use an APC 1KVA for this purpose. Only difference is I am running my entire AV rack including a lamp driven DLP projector on this

[saket77]

Originally Posted by Arch-Angel

Hi Saket, For understanding what a sine wave inverter/ups is, you need to understand what a sine wave is. A sinusoidal waveform is the one we get in our power outlets at home.

It has an Amplitude value of 240V and frequency of 50Hz. Normal inverters use different types of transistor/firing circuits to replicate this sine wave from the dc power stored in batteries. This includes circuits like H-bridge to do the inversion process. Their output isn't sinusoidal. Rather, it would be a triangular/stepped wave/sawtooth/square wave. This is not suitable for all components and especially power supply circuits will take a hit because of the same. This is why sine wave inverters were realised.

Sine waves: They are more suited for all electrical/electronic applications since most applications are designed to run on AC. I could explain it in detail if you want, with illustrations of firing angles and waveforms on how it is done.

Here is a link illustrating why must a sinusoidal inverter be used.

Link: Why do you need Sine wave inverter/UPS

Conclusion would be that, for all electrical/electronic components, get a sine wave inverter only.

Hello Arch-Angel,

Thanks for the excellent explanation. It was crisp & to the point. I grasped most of the things that you conveyed. Surely that helps!

Originally Posted by bhp_maniac

It is better to have a Sine wave inverter for sensitive loads. I use an APC 1KVA for this purpose. Only difference is I am running my entire AV rack including a lamp driven DLP projector on this

Hmmm...so that means that normal APC computer UPS which I was planning is not suitable for the purpose?

[Arch-Angel]

Originally Posted by saket77

Hmmm...so that means that normal APC computer UPS which I was planning is not suitable for the purpose?

It will work alright. But it isn't good looking at the long term health of all those integrated circuits and power supplies you have for the setup.

[saket77]

Originally Posted by Arch-Angel

It will work alright. But it isn't good looking at the long term health of all those integrated circuits and power supplies you have for the setup.

I wish we had a 'Thanks' button in this section too. You know what I mean

[Arch-Angel]

Originally Posted by saket77

I wish we had a 'Thanks' button in this section too. You know what I mean

Hehe, glad to know that i could be of service Saket.

[RajeswaranK7]

My APC 1KVA BI sine wave inverter in the ground floor is down with a burnt board. Its a 24V 2 battery system( 2 X Exide Invatubular 150AH IT 500). Called up the APC guy nearby and he said 1KVA is not available anymore and the only model available is 850VA sine wave model(12 V single battery). I am thinking of going with Su-kam Shiny Pure sine wave 1500VA 24V model, is it a good choice or is there any other models I should look for.