Electrical

Dont do it! Its bullocks. All you create is heat and a dangerous situation.

I hope you understand that you cannot just feed back into the main unless you are the owner of the grid and separated from mains power.

Your energy provider will have to know about this!

you need permission and a safety switch for mains power off. If the grid is switched off for maintenance and you still feed into it, it will be live threatening situation.

I'd say better leave your finger off it.

We are aware about the same but when main is off all will get off. so there is dangerous situation.But concept is good . Instead of wasting power into form of heat we are trying to reuse it.

Then why would you create it in the first place? You are aware of losses and that you never get more out than you put in. It makes economically and technically no sense!

The concept as described is nonsense.

To conserve power, simply switch the contraption off when the battery bank reaches full charge, and on again when it reaches some pre-set 1st low level.

It's depending upon the condition but most of the time it takes 75 watt.

And there are many tools in the market for measuring the power - such as

BT2000 - It is very flexible and scalable station.

Equotip 3 - It is also a nice Station for your requirement.

who came up with this genius idea? you sound highly unqualified, I mean no offence but I suggest in the strongest terms you consult with professionals with experience playing with electricity before something goes terribly wrong and someone is injured or killed

Go for it! Full power is best.

The gene pool is overflowing, and this will help.

No your main incoming current will not drop. It will go up.

What are you attempting to test or accomplish with this setup ?

Do specific devices in the system need testing or are you just trying to save power?

Nope... not a good idea for many reasons.

What does "RRU" stand for?

Probably a Remote Rectifier Unit, typically used in catholic protection systems for pipelines and such. It allows a SCADA system to monitor and control the catholic protection via satellite or cellular communications. It gets AC from a utility service drop and uses DC to prevent pipe corrosion, and they often come with large battery banks to maintain the system if line power fails.

This scheme sounds like they are testing the RRU and want to potentially recoup the power that gets stored in its batteries after the test is completed and put it back into the line to help offset the energy cost of the testing.

If so, this is one of those concepts that looks good on paper, but implementation is likely more costly than imagination. At some point, you need an inverter to change the DC back to AC, and that inverter may be so expensive that the return on investment will take several years. I would not bother with running the DC back through a motor though, I would just use a solar grid-tie inverter, it will already have the required protections for meeting utility regulations.

LOL... yes... we have to protect those catholics somehow.

Well, they're not supposed to be using protection in the first place!!

LOL, that was from my iPad, funny. I guess it didn't like cathodic.

So I guess that means Apple prefers "lic" over "dic" then?

I like the comment about protection too, very good. Everyone is on their game today.

What exactly are you trying to accomplish with this inefficient and dangerous setup?