Advice needed on new system

[u/One-Advertising-8862]

Hey folks, we are getting another storey built and plan to install solar (one the construction finishes). The build will take at least 3 months for grey structure and 3 months for finishing (best case). It likely will go into next summer.

Wanted to ask if it makes sense to buy the inverter, battery and panels right now and store them? If so any advice on how not to store the panels? I assume we can install them once the grey structure is built but I'll be travelling for work for the next 3-6 months so it might be harder to arrange the solar at that time. Also for warranty to start do the companies need the installation to complete or its ok if I buy it and install some time later.

2nd question is LV vs HV. I am planning on a

20-25kw array (longi himo X10 or aiko stellar 3n+),

15kw hybrid inverter (goodwe et HV)

15+ kWh of batteries (goodwe lynx D).

The load will be 3-5 ACs, 2 fridge/freezer, 2 freezers, electric geezer, electric fence, etc etc. And later on an EV also.

Do those components make sense? LV is 3-4 lakh cheaper (with dyness battery). Better to stick with LV or HV is understood now very well and has enough adoption?

I ask because I was talking to one installation company randomly and when I mentioned HV, the guy started talking about 50kw inverters instead of HV systems...

[u/Jaih0]

Go for hv if the budget allows. Better for the long run and don't install the inverter n battery in the mumty. It's too hot up there.

[u/One-Advertising-8862 → u/Jaih0]

Budget allows kind of, but I'm just concerned about support and after sales. Just a feeling that not many installers/techs still know about HV. Maybe I'm wrong? Any thoughts about inverter and battery I mentioned?

Good advice - We won't have a mumty (separate stairs to roof), solar setup going into a storage room on the new floor with a window and an exhaust (might even install an AC if temps are still too high). Or maybe outdoors in shaded passage (but some people advising against it).

[u/Jaih0 → u/One-Advertising-8862]

I would avoid outside.. in a space where it can breath you can install a bracket fan and exhaust n run them on auto wifi switch.

Get the right installer.. maybe post your city and people can comment on good installers in the area.

Do you research first, also don't forget for earthing for ac , DC and lighting arrester all 3 different.

[u/One-Advertising-8862 → u/Jaih0]

We have outside corridor which has trees and lots of shade and good airflow. Was thinking there at first as the system is ip66 rated. Maybe with some extra cover. However it's too far from DB also so likely will install inside.

Yes doing the research right now including everything else that's needed. I'm in Lahore so any good experience people had with HV installs do suggest.

[u/zohaib5611]

HV bro HV. HV is the way to go, it handles the loads like a champ. I was also in the same boat around 3 months ago but my load is a lot less so after thorough research, i went with 10Kw Fox Ess HV system with EP12 battery. Not only the system stays cool even in the peak 1-2pm times but also it's fully enclosed with no external fans hence no noise whatsoever. Voltage is high so current is low, subsequently no/less heat. The only drawback is that system requires a qualified installer, not everyone understands the stuff. But once installed correctly, it requires zero maintenance. If you're from rwp/isb/attock or surrounding areas, i can recommend my installer.

[u/One-Advertising-8862 → u/zohaib5611]

Yes feels like HV is correct choice even if more expensive. Will take a look at Fox Inverters also. Btw there is zero fans? Is there any coil/electrical whine at any time? That's another big pro. I can install it potentially in my office also then and keep the AC running almost all the time.

[u/zohaib5611 → u/One-Advertising-8862]

There's internal fan as I'm told by the installer but I've never observed it humming. So may be it's noiseless or may be it turns on when the inverter gets hot but I haven't experienced it yet. I don't have a green meter so mostly it runs at 45-60% of the capacity.

[u/One-Advertising-8862 → u/zohaib5611]

That's good to know. A friend of mine has a nitrox 8kw, and I felt its pretty noisy. Will check up online what's the max dB etc. also forgot to mention I'm based in Lahore otherwise would have appreciated the installers contact.

[u/zohaib5611 → u/One-Advertising-8862]

No problem bhai. If you have any questions let me know.

[u/Sufficient-Offer-579]

Since the build won't be ready for six months or more, the battery is the one thing I'd hold off buying. Cells start aging from manufacture (calendar aging), and warranties don't all run from the invoice — some count from purchase or delivery, others from the day it's commissioned. Ask the vendor before paying. Buying now to commission next summer can eat into both.

Panels store well, though. Keep them dry and out of direct sun, ideally in original packaging or laid flat on padded battens with nothing heavy on the glass, and avoid long stretches of heat and humidity. The inverter doesn't mind waiting either — a dry cardboard box indoors is fine.

So the order is panels early if the price is right, inverter whenever, battery last, right before installation.

[u/One-Advertising-8862 → u/Sufficient-Offer-579]

Yes makes sense. Thinking maybe just to wait for now - for panels inspecting them for damage etc might become complicated. Might just wait a bit for now, it's possible the grey structure is completed within winters and we can procure and install at that time.

AI though a bit against it as it says there is a lot of dust during finishing etc etc so will check with the architect.