₦airaland Forum

favouredbymercy:
It is recommended that for battery type you should select 'user' and then input battery recommended charge voltage parameters. Your DIY battery is from what source? Because the 55.4v i see here is low. Most BMS cell balancing starts from 3.5v per cell, i.e 56v for a 16s pack like yours. And if your balancer is passive, you would need to go even a little higher.

55.4v is low? Omo 😁😁. That's 3.46v which is over 90% of full charge. That's a very ok charge voltage.

Don't forget that LFP maintenance are rated based on 25ºc. That's temp for summer in Oyibo land. I'm Nigeria that's a cool temperature coz 90% of 365 days in naija we are above 25ºc ambient temp not to talk of temp of cells in the park as calculated by bms.

Where i stay ambient temp gets to 42ºc. If you charge regularly even at 3.5v in our high temp you are reducing LFP lifespan. That's a fact.

I always set active balancer to start balancing from 3.4v. My max charge around 3.46v. You'll not gain anything from 3.5v to 3.65v apart from heating ur cells and reducing lifespan.

Dam5reey:
Na only emotions people them Dey take Argue, Facts no dey.

Chief, seems you are solaris surge (or something like that) on Tiktok.
Weldone for all the efforts you do for this solar field.

You've always said that one day you'll test DIY battery packs of valto and mrreed to confirm the grade A cells they use for their set up. We know they've been tested by them and went above stated ahm capacity. But from a 3rd party will be cool for scientific and fun purpose.

Lastly... That elejoy mppt tester you got is the wrong one. Yours is showing EY1800W with green body outline. Elejoy doesn't produce anything like that. Its a fake knockoff. I saw an American guy testing with same one you have and he tested even when panel was facing down and it gave 500w+ 🤣🤣. You all bought the fake.

Always buy the EY800W that has red body outline. It's the best.

When will it dawn on you all that Nigerians don't care again about this show?

I don't even think anyone knows who won that of last year. That's how Nigerians are beginning to get serious and avoid this distractive show with no value

brightk:
i would rather pick a deye 12kw over growatt 12000 Es. but factor in their pockets..

As you sef typed this Deye 12kw, your heart no cut small for me?
No be yahoo boy get the facility 😭😭

brightk:
maybe you should visit the location and do some analysis.. check each devices consumption, peak load hrs and off peak load hrs.. i think u can draw your conclusion from there.

You are right.
But assuming (we are doing assumptions now) the load is truly 5kw at peak, would you suggest a high frequency inverter like Growatt 12000 ES (12kw), or you would prefer a transformer based inverter coz of surge current from hospital inductive loads?

dollarnaira:
Tell them to go and buy Mikano generator. End of discussion!!!
No go put urself for wahala oo. Them go spend tire with complaints..

🤣🤣🤣.
Na the diesel dem de spend on the mikano wey dem already get dem wan run away from.

xzynwa:
From the total power consumption of the appliances listed which is 5910w, you should go for a 10kw or at best 12kw inverter.

The is reason is quite simple. Considering things like safety factors, assumptions based on you not physically present for on-site assessments and likelihood of the hospital using other appliances not earlier listed (remember, when this inverter sleep starts getting sweet the user will like to throw in appliances not earlier budgeted) 😴 😀

A likely pointer to the inverter size could be the size of the generator used to power those loads. Get the generator power capacity and oversize it slightly and you get the answer to it.

A 6000w load at 6 hours would be 36kwh. At 80% depth of discharge you will need 45kwh of battery storage to achieve that. Trust me, you will need more than that.

Since there would be grid power to charge the battery, you may get by with roughly about 15-20kwp of solar power.

Mind you, the above suggestion is based on you relying on the information provided by an organisation that may beyond the listed appliances, and stressing the setup beyond what an informed user may decide to do.

Finally, a job like this requires one to have an on-site inspection and critical questions asked than relying on assumptions to avoid stories that touch and "solar na scam"

Simple truth.
Thanks

bassdow:
Not to consider days when they battery bank is yet to recover fully from previous day's usage or days of poor weather.

Also as for the freezers, who knows if they are the types used in temporarily storing bodies or mayBe blast freezers sef.

Let's not assume since a hospital ain't a household.

In situations such as this, after studying things, even going there in person, I would give 3 quotations:
1. The actual quotation (e.g 10kwh)
2. The actual quotation with 50% extra (e.g if 10kwh, this would be 15kwh)
3. The actual quotation with 100% extra (e.g if actual is 10kwh, this would be 20kwh)

Also you try to put as less pressure as you could on the batteries. MayBe even make the setup 2 parts where 1 part handles a set of loads while another handles a set of loads.
Also hope these don't include MRI machine sha.

Truth is, a lot of times, don't rely on the client giving you their full load hence you need factor that in as allowance.

I put brief explanations and suggest they grant me a face to face opportunity to explain further. this is necessary in organizations where there are lots of bureaucracies.

I like how you are reasoning the "what ifs".
When a hospital says freezer/fridge, it may not mean our household freezers. It could be for bodies or any thing. I didn't go to check it, but the person that did said 500w for each. Could be right or wrong. As you said, until one goes and is sure. There are freezers that are cold rooms. You walk into the freezer with your entire body and inside is like full self contain room, but it's a freezer. They can consume power in kws.

HeavenlyBang:
Keep in mind that if those fridges are actually 1500w running power and not inverter fridges, you could be dealing with up to 7kw starting power. Add other appliances and a 10kw inverter is what you should go for.

30-35kwh of batteries sounds about right.

You think a high frequency Growatt 12000 ES (12kw) is durable enough to handle regular heavy inductive loads without needing repairs every year? 😭😭.
Abi just to go for transformer low frequency inverter?

brightk

Mrreed:
6kva inverter is fine
The 30kwh battery is fine too.
Based on your explanation, 5-6kwpanel should suffice

Thanks bro..
With full capacity load of 5000w, you still advice for a 6kva inverter?

cutefy:
You can go for a non hybrid HF inverter.

Are there non-hybrid HF inverter? Or you meant to write Low frequency inverter?

It'll amaze me to know there's a non-hybrid high freq inverter. Pls what brand is that?

xzynwa:
This ain't detailed enough for one to give a suggestion.

Answers to the following question will give a clearer information to what the recommended setup could look like.

Does the hospital plan to go completely offgrid?

Will all the loads be powered at the same time?

What are the critical loads and for how many hours would they be powered?

How many hours of grid power is available?

Would there be room for upgrade or addition of other appliances?

By the way, what about the 3 fridges/freezers at 1500w each still giving a total of 1500w?

Nna eh.
I ask WAEC question, you change am to JAMB question 😁😁🤣.

It'll only replace gen, meaning it's purpose is only to take up those hours when there's no nepa (let's say max 5 hours no nepa - but you can't trust nepa sha). They still intend to use nepa.
Forget the fridge watts, u can clearly see it's a mistake.
Assume that they'll be powered at same time.
Any where could be upgraded any time.

HeavenlyBang
Edrizz
dollarnaira

I was thinking at least 30kwh battery.
Its inverter to use that's cracking me head.

You are a solar engineer and a hospital gives you this load capacity. 5910w.
Note the high power equipment in that load.

What materials do you suggest them to get for a good solar alternative power solution?

Battery kwh, panel kwh, low/high freq inverter? External charge controller?

Experts give ur suggestion.

Jefferyzz:
Yh. Sorry. It's 130v.

This felicity chargers tell you max vdc is 130vdc, but they never say what's the max current it can handle. It only states charging current (80a in this case) but that's different from the max current into it's input (or maybe I'm wrong).
I don't want to create strings of panels in parallel that will increase current and burn the charger.

Hope my poor English is understandable

BigDickProblems:
Taking a closer look at this image again, the funny thing is that the instruction on how to select your battery type and all that are boldly written on the right-hand side of the inverter. Damn!
😂😂😂😂😂

Lol. Too much garri made us not to see it

Royle2014:
Unfortunately this one doesn't. Had to connect to battery terminal and turn it on just to show u.

I have checked d manual both online and offline but no secret menu

It's not from the screen.
Check around the body.
There should be physical buttons or something around the body to choose battery type. Check well.
But even if you don't find, you don't need to worry. Just get a charge controller that you can edit. You've explained that you'll never run the battery even half way, so no wahala

Valto:
so how will he set low voltage disconnect on a dumb inverter

In his use case he has no need for smart inverter. He's good and better off with his 5kva inverter because he ont uses it at night and with his load, there's no way he'll ever get near low voltage. All he needs is a charge controller.

I've been using your lithium in a place for clocking 2 years with an old inverter and an external cc handles changing. From night to morning we never get even to 70% soc by morning.
If in worse scenario it happens that it gets low, the BMS has been set to cut off battery and, of course inverter, at a safe specific voltage.

You don't need a new smart inverter. All you need is anything reliable that can invert pure sine wave for you and you can work with LFP. That's if you know what you doing.

papyjaypaul:
Oh please, get off your high horses and find something else to do. Do you know how many live matches we have seen in real life where they did not send notification before stripping themselves in the bool fight

I like Catholicism for their discipline and orderly behavior but one of the things I find ridiculous is man confessing to another man of his sins when you can talk directly to your maker. Talking to people is therapy sometimes so I can see the benefit in talking about the sins and taking the burden off your chest but we all know why you can't confess some sins to 'father'.

Guess Jesus was ridiculous in granting his sinful apostles power to forgive sin or even power to retain sins. That's the same tradition the Catholic church has kept since Christ being the first and oldest church. The origin of it is Jesus himself. If you call it nonsense, you call Christ nonsense.

And yes, you can confess any sin on earth to a priest even if you kpai the dad of the priest you are confessing to.

And for that pic you posted, the UK can make their laws, but no priest will obey it coz no priest can ever reveal what he hears in confession even if he has to go to jail for it.

Monsieuryankee:
How can I set it to charge and float at 3.45v-3.48v?
It's an sms (sunmate) 4.2kva inverter.

Check the manual sir.
If you press and hold the last button by your right you'll enter settings menu. Use the manual to guide you for each menu. Don't temper with that area if you don't know what you are doing.

For the figures i gave you, just times them by 8 if its a 24v system and by 16 if its a 48v system

Monsieuryankee:
Sorry it's an oversight

The load is just 250-300w

Then... Always make sure your charging voltage and float voltage are same. If not, some inverters will push all loads to battery even in sunlight until it gets to that default low float voltage in the inverter. By the time evening arrives, you have a lesser reserve to hold at night.
LFP doesn't like high float voltage, that is staying in one high voltage for long all day.
So i advice to charge and float at 3.45v-3.48v.
You must not follow this. Just my personal preference.

An 8kwh battery will hold 300w all night ( 300w x 16 hours = 4.6kwh).

If you are the installer, dedicate a day to be there and see how many amps are charging it till it gets filled up. Then watch how it's discharging and how many amps are leaving.
Its quite easy to diagnose such problem when you are there. Maybe neighbour de tap light 🤣🤣🤣.
You check each cells too (only if battery let's you see) to see if a bad cell is there. If one cell gets to 3.50v it may read as full when other cells are still at 3.2v 🙆🏾‍♂️🙆🏾‍♂️ chineke.

Its quite easy to diagnose sha when you are there.

Monsieuryankee:
Please you guys should help me

I installed
Sms (sunmate) 4.2kw inverter
Haisic 8kw lithium battery
600w jinko panel × 5 in series
Problem now is that, the inverter charges the battery very fast even when the weather is very dull, and it discharges very fast.

It can charge to 100% is less than an hour an hour and it discharges so fast.

I installed this setup with 400w x 6 elsewhere and experienced the same problem. Initially I thought it was the low voltage panel that was causing it.

But I'm still facing the same problem with this new installation in a different place entirely.
What could be the problem?

You didn't tell us their load.

Even a 100kwh battery will discharge to the end in an hour if you feed it a load of 100kwh.

bassdow:
shey you observe say na aJeBo (Hybrid) inverter e dey use. I no talk say e no go carry am; na make e no stress the thing. As for the brand, what do I even know

As pros it'll be cool we stop using HYBRID as a term here to refer to HIGH FREQUENCY inverters.
It confuses new people here who are learning about electricity and solar renewable energy.
It'll make people think that low frequency inverters can't be hybrid whereas many low frequency inverters are hybrid.

What makes an inverter hybrid is simply that it has ability to use multiple power sources together - PV, battery, grid and/or generator.

Hybrid features:

PV + Battery + Grid/Gen integration in one unit.

Bi-directional battery charging (charges battery from solar, grid, or gen).

Priority settings (e.g., solar → battery → grid, or grid → battery → solar).

Grid-tie + Off-grid operation in the same unit

Automatic source switching without interruption (UPS function).

All felicity IVPM inverters for example are low frequency hybrid inverters.

Jefferyzz:
Also 230v max voc?

Yes sir. Exactly same thing. Its plenty on aliexpress too with different names.

Because of rain and cloudy season see what a 10kwh panel can only produce all day. 😢😢

Who knows anything about this lithium battery and how to use the WiFi function? I can clearly see a WiFi antenna but can't figure out how it works

Jefferyzz:
There is this 60a mppt than can take up to 230v voc n are within 160-180k range. If u don't av the powmr 140a CC budget

Just found it's cousin in my friends house. It's a generic charge controller that different companies stamp their brand names on it.
Looks and feels subpar. I Will observe performance, though sun has been very absent coz of rains.

Neddyogu:
Bros abeg which one be africanus moskiterorum again naa?

Na him botanical name be that 😁😁

Challspace:
Is it just me or is latency exceedingly high today? Can Lagos folks confirm? I’m getting slaughtered in FC25. My latency is in the 90s.

Why you go dey use starlink play game in Lagos of all places even if starlink station dey near una?

You'll get better latency in Taraba compared to Lagos coz of una population

You are doing well Buffalo.

Now Americans know all of us here dey vex, including our animals.

FUN FACT:
African buffalos are responsible for most deaths by animals in Africa even more than huge wild cats.
They are only second to African mosquitoes (africanus moskiterorum) that take the first spot unaliving multiple thousands every year.

We've reached a level where government can do us anything and we will just keep quiet.
We no get energy go complain again.
If them like carry fuel to 4000, we don tire

Still very very much available for anyone that is interested.