₦airaland Forum

mcTrinity:
Hi Trippledots,

I doubt if you can just buy a soft starter and use it with any inductive load. I believe that load has to be designed for such. For example, you can't just buy a soft starter or a VFD for an electric motor simply because you want to "check" the surge pull of that motor; the motor must be designed for such method of starting, otherwise it would malfunction..

By the way, note that what Soft starter or VFD does is that it reduces the Voltage/frequency applied to the inductive device and gradually ramps it up. If you apply a reduced voltage/frequency to a device not designed for such, it would burn out.

An inverter fridge cruises from very low watt up to about its rated watt, with the rated voltage/frequency applied to it.

So, it's not that simple to just use a soft starter

mcTrinity:
You're right earthrealm... Same observation with mine. After recently upgrading my system, I left my inverter fridge (rated 55W) permanently ON, through a socket-plug energy meter...

Initially consumes around 78W.... After like 12hrs, it drops to 55W... After 14hrs,it drops to 32W.... And further drops to 30W after 15hrs.

Even when it knocks off, when it comes back On, it stays at 30W. And that's where it has been since.. Just hovering around 30W. Sometimes 28W.

There were very few times though, I've noticed the fridge would be On, due to the compressor sound, but the meter is reading less than 10W...

But before the upgrade, I run it from 8am to around 6pm.... Always runs around 78W-62W.

So,yeah... Inverter fridges are best left permanently ON

mcTrinity:
Hi Ojeysky,

To an extent, yes.... But there are wide differences.
I used to have a Table-Top (student) fridge rated 75W. Every single time the fridge is starting, it pulls around 800/900W...not kidding. Even my 1.5KVA/24V Mopower Inverter beeps. I've run it for over 10hrs,yet it kicks in at over 500W...

My present Inverter fridge cruises from around 20W and gradually reaches the 78W max. It starts coming down after like 5-12hrs. Stabilizes at around 30W after 14hrs.

For the bolded, that's the whole point. Why would it lose power, if you're looking at inverter fridge? With inverter fridge, it's best to run it 24/7. The only periods I cut off power is when there's rain and it comes with Lightning and thunder. I usually do a total isolation of my inverter system, since the house I'm staying doesn't have either a Lightning/thunder arrestor or even grounding for me to use a SPD.
Even if the power loss lasts for about 3hrs, after powering the fridge back, it doesn't go above 55W and within 1hr, it stabilizes back to around 30W...

Chrismanuels:
barely used hp laptop with invoice
HP 255 G1 Laptop Specs
Dimensions: 37.6 x 24.7 x 3.58 cm
Weight: from 2.45kg
15.6-inch LED back-lit HD display (1366 x 768 pixel) with anti-glare
Full-size keyboard
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AMD Dual-Core Processors (1.48 GHz or 1.75 GHz)
Intel HD Graphics (Intel HD Graphics 3000 for Core i3 models)
5GB RAM
500 GB HDD
DVD Writer
Windows 10 Pro (64 bits)
Wi-Fi 802.11 b/g/n
Bluetooth 2.1 + EDR
Bluetooth 4.0 (optional)
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3 x USB 2.0
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HDMI
VGA
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47 WHr 6-Cell Li-Ion Battery
HP 3D DriveGuard

Penuelseun:
Thanks, they are both fused and to get contactors where I am now is hard, will keep on searching. I have been using them like that for up to a year

Barezzi:
Penuelseun,
Two independent Relays switching power to a load is very dangerous!
The likelihood of both latching the same time is very high.
Relays fail all the time, i work where this happens regularly...

To mitigate, consider using mechanically interlocked contactors. It's physically impossible for both to energise at the same time.

mank1234:
He said he is a DIY enthusiast.
He derives joy in doing it from scratch.

I would have expected him to buy coil and build a relay and then take it from there. Or better still produce coil then use it to produce a relay.

NiyiOmoIyunade:
I stumbled on this and traced the history backwards one level for some background but still struggled.

Why are you using two relays to switch power to one load please?

Without extra information this looks like a job a DPST relay or contactor would easily do.

Penuelseun:
Not so good with drawings, please make do with this, connect the live output from your public power supply to the NO wire of relay1 and connect the neutral to the NO of the relay2, connect the live output from your inverter to the NC of relay1 and connect the neutral to NC of relay2, you then connect common terminal of relay1 to the live output going to your load and connect the neutral to the common terminal of relay2. You can connect the wires for the coils for the two relays together so they are powered by a 12v adapter. Connect the adapter to your public power supply so when there is light from public utility, the relays switches to the NO position.

essegis:
24p4s

See pictures

spartacus11:
Reliable Electric

essegis:

I'm sure I'm one of the reasons it was sold out. Did you see my set up?

Penuelseun:
Cost about 3k to setup, used a 12v adapter to energize the relays

Kodartech:
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Blueprintz:
Thanks boss, have gone through this thread and have not seen any device for LVD, but people always advise for 50% DOD (how effective can one monitor a system at night)..
Which anyone can point me to a LVD device

essegis:
Guys, the last set of these batteries just came in. I can now start building. Too bad I'm still stuck at work and would also have to do a basic build on the first run. No BMS, breakers or isolators. These will come in when Corona allow economy start to move freely again.

For now my people need an alternate source of power so my old remaining DC fuses would just have to do for the time being.

essegis:
One of the reasons I now go for external chargers. Over the years I have packed and condemned inverters with either bad chargers or bad inverters. Going together is NEVER a good combination.

Cheap Chinco "Reliable" I bought since 2016 is still doing the job, no chargers attached.

ceaser:
She mentioned 2 yellow bulbs and 2 coloured bulbs. I'll wager those are incandescent lights like 100 watts each or at best 50 watts each. That's not to mentioned the 5 white bulbs she wrote which are likely CFL each likely 25 watts each - that makes 125 watts and then with the 4 incandescent bulbs (400 watts). That totals 525 watts on illumination alone.

525 watts will power 5 small sized deep freezers.

bigrovar:
Yeah, so can AGM.. I am still 4 years away from getting LFP. I am still not sold on it yet. The tech is still too bleeding edge and expensive for now.. a 140AH pylon setup would cost close to 1.4m (at N360/$) If I spend N500k on 4 Quanta batteries I would get 400A which would serve me for 4 years of diligent use.. I can then turn the 900k to dollars and put it in a eurobond account for the life time of the Quanta (4 years) by 2024.. my dollar investment would of grown.. Lithium batteries would have gotten better and cheaper and I might still be able to buy the cheaper more efficient and more capacity lithium from the eurobond investment. Economics of Lithium doesn't work for me .. yet.

Janyves:
I'm yet to work on a Studer inverter. Your fangpusun is a Studer Xtender clone. Personally I hate fangpusun brands because of their "Kopy Kat" legacy.

sugah:
Fridge is back on the market... previous buyer reneged on the agreement due extended lockdown.

Explorers:
As if things weren’t bad already, on April 10th, Erin contracted the coronavirus, effectively extending her ongoing 4-month stay at the hospital.

However, by this point, she is a certified warrior and, despite her life hanging by a thread, the doctors announced that she had pulled through and beaten COVID-19.

JUO:
I have to do this just to convince some of you. I switched off every other load apart from 2 ceiling fans, 3w*2, 5w*2 now check out the consumption and do the calculations yourselves. The inverter is taking less than 12w

ojeysky:
Fan at 5 watt speed eh.....that one na hand fan o, and 3 watt bulb eh? Isorite. With the bolded na KIV o

olaolu11:
You never by mistake "body" fan and he fall everything come scatter? My in-laws fans dey like that. Rope way dem take tie am together pass as agbero tie load for oshodi

mctfopt:
Someone installed a solar water heater four years ago here, here is the thread detailing about the process: https://www.nairaland.com/390522/solar-energy-complement-fta/183#50744403

There was even a breakdown of cost and some comparison with getting a conventional heating system here: https://www.nairaland.com/390522/solar-energy-complement-fta/185#51106187

But that was FOUR years ago, prices are bound to have changed, either it is now higher or lower. Good luck

zeanslim:
LTE cube ? Bought keys, If you want to you can PM me.

zeanslim:
Fully unlocked smile LTE cube (can work with any sim)

Support up to 32 Wireless users

One RJ-45 port and one RJ-11 for LAN connections

Comes with a 12v power bank

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ceejay80s:
Oga u have not given me any positive answer concerning my battery, u wanted me to keep it off this thread and I did, just for u to tell me on WhatsApp to add money and carry another battery , probably a returned one from a Nairalander which I told u I don't have any money and u ignored all my msgs afterward, u could not even consider the fact that u have made lots of money by posting ur ads on my thread, don't worry.....continue.
The very first day u sold this battery to me, I told u the problem it had, but u were arrogant and told me to go and get an analog charger, which I did and the same thing continued, if ur conscience would judge u, u knew that battery had charging fault, u knew cos there was no way u bought those batteries without testing them. See ...I go buy another battery probably a lithium battery from China when I save up money but carry ur market go another place, start ur own thread pls, trusting and recommending u will be really difficult for me now

Drgreatone:
Pls help house, my 650va converted ups has bin goin off on its own after 3hrs wit my 100ah battery yet when i plug the battery charger, battery level is still abt 60%. I usually get abt 6hrs wit the battery still around 50% at the end.
Secondly, i noticed the ups phcn indicator goes off when i plug the battery charger to the battery ends when there's light, thus i av to disconnect the UPS whenever i want to charge.