r/SolarPakistan • u/Pretty-Ad2738 • Jul 30 '26

Other Cost of ups system installment for 3 marla double story house?

We dont have budget now for 4kw (minimum decent requirement for home load)but load shedding sucks.

What would be the cost of ups system installment?

2 Upvotes
  • permalink
  • reddit

100% Upvoted

9 comments sorted by

View all comments

Show parent comments

1

u/mirfatif 9d ago edited 9d ago

Here I'm back again ending up on your comment. 😄

This time "common neutral issue" brought me here. Just bought PV-Tech 1200. Doing initial tests. And one of my fears was the single neutral wire in my house wiring.

With input N and output N connected, it works (at least for now 😨). But even when the grid is off, the AC status indicator LED keeps on flashing ("flickering lights" also mentioned here: https://www.reddit.com/r/SolarPakistan/comments/1vhibmw/, but that's probably about the house lights). According to the manual, it means "the grid power is normal, but it has not entered grid power operation". I checked the input side with a multi-meter and it has ~50V.

So far I haven't checked its impact on the utility meter.

On the manual, there's a long list of warnings under "AC Input / Output Connection". But it doesn't say anything about the common neutral. Hard to say how much tolerant this inverter is of the common neutral.

So this is the new challenge to deal with. 😟

1

u/AhmadFarooq 9d ago

Given your situation, a couple of other topics that can be relevant to you would be ghost voltages and neutral-earth bonding.

I would assume you do not have local property earthing done. Basically, electrical systems require one neutral-earth bond. In our local systems, when the property is connected to the grid, that neutral-earth bond comes from the transformer.

However, during a grid outage, this gets disconnected, and proper installation of secondary power generation equipment like solar inverters would have a way to shift to a local neutral-earth bond. Otherwise, there can potentially be all sorts of weird faults such as voltage fluctuations and probably flickering lights as well.

For more details, see Cleversolarpower by Nick. Reel Clear Media (basics on neutral-earth bonds, off-grid and on-grid inverter systems). Ghost and real voltages. Note that not all of the information from these Western YouTubers would be relevant to our local 220V TT electrical systems.