If I was in my family House I would have checked the waveform with an oscilloscope, but the inveter frequency is capped at 50hz according to the monitor app.

jonescosmos:


In simple terms, there are 3 types of Inverters.. . The cheap one used to simply be square-wave, that is ON + for half the cycle and - for the other half cycle. . . OK, for lights, and heating equipment, did work with computers and some other stuff, but probably not very good for them.. . Very high in 3rd harmonica and other odd harmonics as well. . . Then they improved these by having an OFF period between the + and - .. . These are “Modified Square-wave” but the naughty manufacturers call them “Modified sine-wave” which they certainly are not.

Then, in the old days, we used to have real TRUE Pure-Sinewave Inverters.. . These were proper sine-wave and very clean, even cleaner than the grid supply, free of any harmonics or any other products. . . . They worked very well, but they were inefficient at converting DC to AC, and so gave off a lot of heat.

The more recent, particularly larger modern Inverters use a form of Switch-mode, often referred to as PWM. .. They switch the DC feed to the output, often through a transformer, in very fast On/Off pulses. . . The On and Off period ratio, sort of matches a sinewave approximately. . . . So with efficient output Filtering, their output is fairly close to a sinewave. . These are the true Modified Sine-wave inverters. . . The filtering blocks most of the harmonics, particularly the higher frequencies, their outputs are good for anything that normally works from grid power. . . But they are NOT True sinewave as manufacturers call them, but they are very power efficient, typically up in the high 90’s %. . . Some claiming 98% efficient, whereas the actual True Sine-wave, as I mentioned before, from Linear Inverters, were perhaps only about 60% efficient.

The outputs of inverters that are power efficient have a lot of harmonics.
Back in Engineering 201 (I think it was the sophomore year) we learned about the Fourier transform and how any waveform can be created with a series of sine waves with different frequencies. frequencies.

The attached picture shows what happens as you add odd harmonics (3*F, 5*F, 7*F) to a sine wave. You can see the sine wave starts looking like a square wave.
A square wave, or any rectangular switching waveform, has a bunch of harmonics present that are often significant at more than ten times the square wave frequency.

For some equipment this is no problem. A lot of components today such as chargers and displays just rectify the AC input right away. Harmonics either don’t matter or they are mostly filtered out and don’t cause a problem.

Magnetic equipment, such as motors and transformers, are not so forgiving. The magnetic material in most line frequency magnetic components is a silicon steel alloy that is chosen because it works well at low frequency, 50 to 60 Hz. The losses of silicon steel increase rapidly with frequency. If there is significant energy at 500 to 600 Hz the loss of the magnetic material causes it to heat up.

Things like refrigerators, fan motors and old equipment with a line transformer can all be heated enough to cause failure.

In many pieces of old equipment the AC inputs are not as well filtered and the higher frequency harmonics can cause noise and interference.

An inverter that doesn't produce pure sine wave energy can have a number of negative effects, including:

Reduced efficiency and increased power consumption. A non-pure sine wave inverter typically has lower efficiency than a pure sine wave inverter, which means it requires more power to produce the same amount of energy.

Reduced performance of some electronic devices. Some electronic devices, such as some types of motors, are sensitive to the type of power they receive and may perform poorly or not work at all when powered by a non-pure sine wave inverter.

Increased electromagnetic interference (EMI). Non-pure sine wave inverters can produce more EMI than pure sine wave inverters, which can interfere with other electronic devices and communications equipment.

Reduced lifespan of electronic devices. Some electronic devices, such as some types of motors, may have a shorter lifespan when powered by a non-pure sine wave inverter.

It is important to note that these negative effects may vary depending on the specific device or equipment being powered by the non-pure sine wave inverter. It may be best to consult with the manufacturer or a qualified technician before using a non-pure sine wave inverter with certain devices or equipment.

The utility charging current is set at 20A, the max is 30A
While the other charging current is set at 60A I guess that is for PV.
When you told me you Cook with yours, that convinced me it's a great product.

futurenix:

This one serious. It's not upto a month you mentioned buying this item and it's already giving issues.
The one I have does not fan continuously.
Check Utility charging current if it's set to Max. ( If yes, U can reduce to 60-70% if the fan still blows continuously).

Can you post the picture of yours here atleast people will be aware?

It's a hybrid.
Heats up easily while charging with Nepa, the fan stays on through out the charging period.
Damaged my laptop chargers. (All those kikiki sounds, from there the charger will stop working)
Haven't loaded it more than 300 watts so I don't know how it handles load.

brightk:
please what happened to yours. I AM Looking for a detailed review on the must 3kw 24v inverter.is it a hybrid inv or Standalone

Those prices are tempting, if the distance isn't that much, you pay him a visit.
Keep us posted, will like to get the Felicity 5kva hybrid inveter as my Must 3kw inveter isn't serving anymore.

Immanuelar:
Hello gurus,
Please I'm about getting some solar materials from justcallmenu.el here. I would like to be sure if anyone has patronised the seller without regrets in terms of quantity. Main concern is that some prices he gave me are much cheaper than what installation engineers quoted. E.g he stated 10kwh felicity lit battery as #1.35m against #1.7m quoted by engineer; felicity 5kva hybrid inverter as 350k against 550k quoted by engineer.
This is nothing personal, just making enquiries before purchasing an expensive item.
Tnx.

Bro, this Must, mine when charging with Nepa the fan stays on for ever, is it normal for MUST products or is it faulty.

justcallmenuel:
Go solar today… Call/WhatsApp me on 08168986461

zeestone99:


I use to run microwave on a 2kva bluegate back then. Who remembers that rugged black bluegate that year.

Really what's the capacity 0f the microwave, I'm planning to get an LG microwave rated at 1000watts, you know the surge power of microwave is four times the rated power, that means it need 4000watts to start up and my inveter is 3000watts.

Hello guys, please which Microwave can I run on a 3000w inveter, considering the power surge, or it is not advisable to use a microwave.

Alright, thanks very much. I give them a try.
But apart from that which other good brand can I get below 350k 3.5kva hybrid

futurenix:


I actually have one I bought in 2021, the 3KW and it's still working till date. Use it to cook ones in a while. The second was bought for a client late in 2021 and still in use till date but they modified it recently and this current version is what I have not used.

There are guys now who can repair those inverters though they charge higher,30k upwards depending on the level of fault.

Boss have you tried this Must inverters, do they have fakes and do they have repair centers across the country. I noticed they are cheaper compared to Felicity

futurenix:


Your questions plenty ooo, The response is more like summarising a book on solar system.

If you have money go for Victron or Deye else just get a common one for your budget. MUST is ok
Number of batteries and run time depends on load. Monocrystalline is a type not a brand.
There are inverters with batteryless function which can work without batteries.

Just State your loads and budget for the system so You can get a reasonable quote.

Hello guys, this package has been in Nigeria since 27th June, but I'm yet receive a call, tried tracking it on NIPOST website but it's not showing anything.

Tracking number: SYAE010778029

aieromon:


Source?

I no fit lie to you.

Daniel2802:


AliExpress is trying out Tranex for their logistics, yours is better. They're faster.

Please o the Tranex is it Nation wide or only in Lagos?
And do they have offices in all the states in the country.?

Valto:
i know a 3rd party shipper that can deliver in about 10days, so far the package has been received. your worry should be how fast the seller deliver to him, most sellers in alibaba normally take time to ship out.

That will be nice, can you plug me in.

I just de read things here from page 400 I'm really scared,
I want to order a 1:1 copy of the airpod pro from Alibaba and I need it within 15days, can you guys please recommend a courier service that can receive the item in china an Ship to naija within 15days.
Help a brother.

What's your location and how much are you willing to pay. still clean af.

franky156:
Hello I need an old facebook account.
NOTE: It must have an old ad account as well
PM Me
Regards

can you pay 5k for the ad accounts. if you need used ones with active ad accounts they in stock. fresh ones still dey.

Epignosis19:

have you checked the battery

Harry3:
Have you noticed that sometimes when you call MTN numbers that are not available, you get different response from MTN such as:

- The MTN number you are trying to call is currently switched off, please try again later. Thank you.

- Sorry, the MTN number you are trying to call is not reachable at the moment, please try again later. Thank you.

- Sorry, the MTN number you are trying to reach is currently not available, please try again later. Thank you.

Please what's the difference and attached "sorry" in the other response while there is no "sorry" in the other?

Please what's your opinion?

- The MTN number you are trying to call is currently switched off, please try again later. Thank you.

they can't beg on behalf of the user for switching off his phone, he must have a reason.

- Sorry, the MTN number you are trying to call is not reachable at the moment, please try again later. Thank you.

they are telling you sorry cause they know the kind of sh*tty equipments they re using, maybe the network is down in his area. which is their fault. same applies to the last one.

- Sorry, the MTN number you are trying to reach is currently not available, please try again later. Thank you.

What's your location?

.

with how many followers?

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sulaimon22:
Good Evening Webmasters, I'm trying to boost my post on my page on fb so the system is rejecting my MasterCard.

have also tried to register for a PayPal acct, this one too is not linking my card with d pp account. is dia any oda options?

select Nigeria, you'll see PayU select it,
it should work for you.

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