₦airaland Forum

isangjohnson:
1.280m Installation.
12v 2kva/1.6kva hybrid inverter with 80a Mppt, 450v max Voc and Mppt voltage range of 50-430Vdc.
6pcs of 180w pv.
12v 160Ah LFP battery.

wat is the brand of this inverter

swagifted:
So felicity has high voltage batteries and inverters... Why are they not in the Nigerian market..

tot abt it 2.

Trippledots:
Alaba

any contact pls

bigrovar:
Unfortunately physics doesn't care about your believes. You can prevent a direct lightning by using active lightning protection systems like Indelec PREVECTRON3 last time I checked the price (sometimes in 2021) when USD was ₦580 it was over a million for the device alone minus installation.

Direct lightning is a very rare occurrence. What is common is electrical surge induced by indirect lightning strike or lightning strike in a near by location. This is why it is best ( more economical and practical and prudent) to invest in SPD. Lightning is a phenomenon that is still being understood there is no exact science that can predict it or guarantee protection against it. What exist are standard practice on how to increase your chances of surviving the effect and impact of lighting.

My central point is. You need an SPD. The Chinese and everyone who cares about important infrastructure installs SPD. Turning off a device or breaker will not protect against a lighting surge travelling 100s of miles looking for ground. It would arc and jump between contacts.. best to provide a path for it to follow. Of cause we are all adult and thus free to do whatever we think work for us.

oga mi ..... since we practice the TT earthing system in nigeria , do you think its wise to do your own neutral/ground bounding on ur mains before going to your db especially to help identify minor earth faults.....

where can i get this ferrules in lagos

jonescosmos:
Inside Deye BOS G HV Battery Control Unit

the boss himself..

FEGEITOK:
I emailed you from a at yandex dot com email address

I don reply ur mail

has anyone don rooft top pv fabrication structures here.. how did u ago abt it.. factory products are very costly

mank1234:
1 and 2 is going overboard. Lightening do also happen before it rain and sometimes while grid is ON.
3-5 is where he should focus his energy.

I would suggest he check the following:
-if his thunder arrestor is properly earthed. There's a building that the tape was cut during renovation and they kept experiencing what he's experiencing until it was fixed.
-if house earthing is separate from thunder arrestor earthing. Bonding means the discharge appear briefly as voltages at grounding terminals. So SPD is needed to keep this potential within limit.
-if thunder arrestor cabling is running in close proximity to any of his power line. This causes induced voltages/flash over on the power line.
-if he has SPD. To electronics, having thunder arrestor without SPD is more dangerous than not having thunder arrestor at all. Also, having SPD incorrectly installed causes harm rather than removing it.

if lightning arrestor earth pit is different from house earthing pit, do you subscribe to bonding both earth pits together to keep the potentials as low as possible? If no do you prefer one earth pit for both house earthing and lightning? Would you use one. Earth rod for ac and dc spds?

gadgetplanetng:
My panels are not on the roof because of this.
Lightning seeks the highest conductor

if u escape thunder from panels... it will come through the grid bro... brace up 4 protection

Dazzling3:
Starlink Elders in the house, I'm thinking of switching from microtik to starlink for a hotel with 50 rooms, is it a wise move? If yes please how do I proceed?

this is not a diy tin.. contact a network engineeer to guide u...

FEGEITOK:
One earth rod.

The panels are next to the house but not on the roof.

What I have noticed is that anything that happens to any electrical circuit whether mains side or PV side the RCCB trips off.

it seems like nairaland dm is not working presently... can i have ur whatsapp digit?

FEGEITOK:
One earth rod.

The panels are next to the house but not on the roof.

What I have noticed is that anything that happens to any electrical circuit whether mains side or PV side the RCCB trips off.

pls check ur dm

FEGEITOK:
I traveled for 3 weeks.

I just returned.

I left my inverters hooked to my solar panels.

One was connected to utility power.

The other inverter was not connected.

I reduced the loads such that even if the sun was not generating enough PV power the batteries would not run out.

Would you have done what I had done or would you have powered down your unit or units?

I came back to meet everything as I left them.

I'd love your responses with reasons.

And by the way the panels are earthed and every earth is connected to or bonded to each other to be safe.

how many earth rods are you using.. and how were de connected sir

osayuwamwen:
No

earthing the panels is no issue.. but you would be creating more danger if that earthi rod is not bonded with other earth rods in dat same structure becos they are not @ zero potential. I stand to be corrected

IMHO.. I think we are paying upfront insurances on these devices

HeavenlyBang:
SRNE is better, but Felicity has more presence in Nigeria from what I've seen.

But purely from a hardware quality perspective, SRNE is well ahead.

omo the cost nor b hear oo. This piple de follow deye for yansh

hello everyone, trying to make a decision between SRNE and felecity inverters.. for those who use SRNE inverters how would you rate it... are there service centers around lagos and does the company stand by its warranty claims

HeavenlyBang:
I plan to.

Fwiw, outside of the times when it does these shenanigans, I get about 1100w from the panels. I'll add another 580w panel, though.

what is ur array size?

HeavenlyBang:
That sounds very plausible, especially since it seems to have started after we got into the rainy season. Lots of clouds even with the sun out.

I'll watch it more. Thanks a lot for your detailed response.



Will do. Thanks.

what brand of panels are you using and how many Watts in total?

Obnoxious2001:
Yeah .

I can offer it at a lower price if you will be Interested

u ve start now ooo

Obnoxious2001:
So research has it that MOV can be used to protect lightening strike...

And I have been wondering after I fixed this felicity surge protector device.

its alright.. so u go do background check... lmao

swagifted:
If i plug my laptop to nepa and put it on my bare laps it shocks me, but when i plug it to my inverter energy it does not shock... What could be the issue

have u tried another adapter? More also check the socket/extension you are connected to if there is any disconnected conductor.

Another question I want to ask if is ur inverter is grounded to earth?

bigrovar:
In a TT system earth to neutral bonding happens between the consumer ground rod, and the ground rod installed at the NEPA transformer that serves your house. The neutral (that comes into your house from NEPA) and Earth electrode (installed at the transformer) is *suppose* to be bonded together. That transformer earth electrode/rod is connected to your house earth electrode (rod) using the mass of the soil / earth between them. The soil acts as the connector. Faults that goes into your earth rod finds its way to the transformer neutral via the transformer earth rod.

For this to work though, the earthing at the transformer level has to be properly done and not more than 5ohms in resistance. It most also be bonded to the neutral supplied from the same transformer and into your house.

Unfortunately, the above is not always the case, we see situation where transformer earthing is not properly done or the neutral is not bonded to it thus making the transformer run a floating neutral.

There is a test for checking if your electrode is bonded to your neutral (via the transformer ground) in a TT system. It is called ground impudence test. This test checks how much resistance exist between your earth rod and the transformer neutral. I don't know much about this impudence test but a competent ground tester should be able to check it out for you.

If you use an inverter, most inverters have MEN relays for when your inverter is operating offgrid or in island mode (in this case disconnected from NEPA) I know for sure that Axpert and SRNE have this MEN relay. It works by bonding ground to neutral when your system is off-grid or when NEPA is disconnected thus ensuring you maintain your earth to neutral bonding. The relay pretty much connects neutral to earth when NEPA goes and disconnects it when NEPA is on.

Some inverters like DEYE don't have this MEN relay hence allowing your system run in what is called floating neutral. You can use an external contactor to fix this but that is another rabbit hole.

boss pls check dm

bigrovar:
Like everyone have added, you need to review your electrical fault system including your earthing. You said you had your earthing done, have you had the earthing independently tested to ensure that it is within the recommended resistance required of a TT earth system (which is pretty much what we practice in Nigeria)

You should also ensure that the earth point for all your electrical socket are well terminated, and those terminations are still functional. You can use a multimeter to carry out basic testhing. In my case I run the connect the red probe to the live, and neutral, note down the voltage (which should be around 230v) then I do this same this time with red to live and black probe to earth / ground (the top part of your electrical socket) it should also read 230v. This will let you know the socket it connected to a sort of ground. (It would not tell you how active your earthing is but it is a good indicator)

Light bulb test can also help, get an incandescent light bulb and connect it to live and earth. A well lit bulb indicate decent earthing. Run this across most of your socket to ensure they are well terminated to earth.

Non of the above test should replace a proper earth resistance test which can only be done with proper tooling and by a competent technician. Often time, NEPA officials tend to have this tool so you might want to reach out to your local NEPA office .. you might be able to have someone come run a test on your setup (off the record).

I attached a picture of my previous earthing setup.

For a TT system 200 ohms and below is recommended but anything below 100 ohms is ideal. The earth resistent tester should carry out test of the earth electrode and also check resistant from central earth bar (from your db)

Lastly on the Main Earth Neutral Bonding (MEN). This is not recommended for a TT system. A TT system is technically suppose to have MEN happen between your earth electrode (earth rod) and transformer neutral. The connection between your earth rod and the transformer neutral is meant to happen through the mass of the earth.. basically the soil / ground between your ground rod and your transformer ground (which is bonded to the neutral that comes into your house. (See the attached diagram)

You are suppose to have only 1 MEN in a circuit to ensure that ground loop fault have just 1 path of return. Bonding Earth to neutral in your DB creates multiple fault path because it technically means you have multiple Main earth to neutral.

Lastly, you might want to try installing an RCD to or an ELCB. The latter to detect earth leakage, the former to detect a fault in the system and trip (in other to save life)

Be careful though RCD can become a nuisance if your electrical connection is not properly made.

The big boss.. am tempted to ask where do we bond this our EARH TO NEUTRAL. I understand that the live and neutral wire from nepa pole end up @ ur meter unit where it is drawn to the db.. Most houses have just one db which powers the entire home. and i know for sure you can only have one EARTH TO NEUTRAL bonding..

durodee:
Chai! How can I confirm the earth is functional? I re-earthed my house about a decade ago when I noticed some appliances were shocking. The culprit at that time was a bridge between neutral and earth in one of the sockets. I used the opportunity to install a more robust earthing wiring to easily allow me connect more equipment in a DIY manner without having to call an electrician.

IMHO, if u had a main db in that house and bonded ur neutral to earth.. i think only that breaker controlling the fridge will trip. and that shock wont be there. U touchin the fridge seems to complete the circuit for flow of current.

. There is more to this earthing stuff than wat the eye can see.... EXperts in the house,, does anyone have experience bonding neutral and earthing on ur main db panel?

how do i join the whatsapp group..

jrupa:
Greetings House, please is it safe to series 9units of 445W Half Cut Longi Solar with VOC of 49.4, Vmp of 41.2V and 144cells on an High Voltage Felicity IVEM 5KVA Inverter that has maximum Solar Voltage as 500V

u re safe.. i just factored in cold days into ur calc.. we nor de abroad even if i put 1.1 temp coefficient u are still safe

Juror:
Nice expose!

wisdom. U sure say u nor b d techland guy.. cos this is how he analyses dollar per watt oo..

Ferdiwar:
Update on my setup.

Sometime last month I connected all my AC to the smart load of my inverter, and noticed that the inverter was going off and on repeatedly for like 5x before stabilizing back on. This would happen severely in a day before the sun goes down as I discovered it only happens during the day.

As a result I reverted back to the previous connection and disabled the smart load thinking that was my issue, but it still persisted, so I did some reading online and concluded it might be a software bug.

I emailed Deye and requested for diagnosis and update which they did by pushing a remote firmware update to the inverter, yet the issue continued (in my mind I was like I spent huge money to buy a faulty batch of an expensive inverter). I sent an update email yesterday to Deye explaining that the issue is not yet resolved (yet to get an update though) after it happened for the 2nd time in the morning (around 11am). At this point I thought it wise to calm down and observe the inverter when next it happens rather than be angry, so I stayed put in front of the inverter and watched it.

Few minutes later it happened again this time around I was watching the screen and boom I caught it in the act and it happens to be that the voltages of 2 strings of panels attached to the 2 MPPTs of the inverter exceeded the max 500v of the inverter (string 1 5x Longi 570w panels was pumping 240v+ as at that time while string 2 5x Jinko 625w panels were pushing over 265v both exceeding the 500v max voltage).

As I saw that I quickly switched off string 1 breaker and the inverter stabilized instantly which suggests that the input of the 2 MPPTs are somehow connected in series or something like that as one of the MPPTs can take 500v alone but the 2 MPPTs combined together is still 500v.

No matter what you do, do not exceed the max voltage of your inverter and take not of the tolerance of the VOC of your panels when connecting your panels to your CC or inverter to avoid stories just in case your inverter or CC is not equipped to handle any form voltage spike above the rated max voltage of the inverter or CC.


@Jonescosmos the 500v is for the 2 MPPTs after all

y all this big brands nor de give deep info on this 2 mppt stuff. Me i was tinking each mppt is 500v max but u cañ share d toral pv wattage amongst both