litaninja:
On today's episode of "Sell-An-Internal-Organ-For-Renewable-Energy".....

some people dont even have any internal organ left

IYGEAL:


You're using a 24V or 48V system?

48V nominal. Rarely goes below 52V on LFP even with the AC

[quote author=Valto post

Thanks

NiyiOmoIyunade:
I actually voted in favour of Lithium but said entry cost was the barrier, fortunately prices keep coming down and circumstances change so that what looked unattainable X years ago becomes mainstream today.

Lithium has really been a fun and rewarding journey.

Interesting idea to monetise *seed* donations, not sure there is any surplus to sell based on the current high stress situation of the country

Look at this man o, trying to dodge. Age is no barrier to the seeds as 70 Yr old men still remain virile, still dey kampe. Neither does "high stress situation of the country" have any negative effect on the prowess for any virile man.

1000 usd for just 5ml something is money o. If guys can be donating it for free inside latex bags which will be flushed down hotel lavatories and still pay the escort money from pocket, then it's better to kukuma make money from the activity itself; that is for the action guys dem.

mctfopt:


When you do, remember to buy the one with a good motor (Bafang, Bosch, etc). And of course a good battery pack (Samsung cells, etc though you can DIY this part).

That's a real invaluable advice on the motor thingy.

Valto:

it have inbuilt adapter. it can be plugged directly to 220v.it does not need external 12v adapter.

Okay I fully understand now. I got it wrong because that was not stated categorically in the specs you put up.

generationz:
.

Yeah, I was also aware of it when it was cheap and super availabe, around 25k back then. But I didn't have the funds for a full set up so I settled for a laptop power bank and praying Nepa is kind.

Do you know how much the new one (imported into the country ) costs? Maybe an average price?
How much

I don't know of any other place save AliExpress where you can get something like that. But anything Lithium is super expensive on that portal mostly due to the cargo costs because Lithium is something that is not allowed by air transportation. But I guess those guys still do it with some incentives which accounts for the high shipping cost.

litaninja:
On today's episode of "Sell-An-Internal-Organ-For-Renewable-Energy".....

Oshomo12:


Lol conversion problem indeed! for me?

When someone makes a post, a lot of people are reading it. Not everybody knows all this basic stuff. This inverter has models, I prefer you giving a model number for easy references for anyone thinking of buying. The only reason why I wanted him to state the model was just that he has attached money to it(he made a reference to a price range of 860-880k).

I believe you saw it when someone made a reference to solar panels made in China and Canada. He got the impression from here.

No be everybody knows this power factor fa!

To the best of my knowledge, Deye has a model of single phase hybrid 8kw inverter. That's why I asked you for reference of where you got one with 10kva just for my information as I don't know of that.

NiyiOmoIyunade:
Let me break form a little here but please do not take it personal. It is getting annoying to see people say this or that is incorrect with no hard data to back it up.

The issue I see here is one of perspective - some people have only used a fairly basic BMS that is not tightly integrated with their inverter system and it works and this is perfectly fine, but then they keep arguing the features and benefits of a system they have never used with another person who has daily access to to data from both the basic BMS systems which have no comms with the inverter as well as large commercial grade systems where BMS and inverter have communications and are tightly integrated together.

I expose the inner workings of an integrated system with data that can be independently proven or disproven but you do not argue with the data, rather just a blanket statement of this is incorrect based on how you run your own DIY system which is essentially for home use. I say yes voltage based control works but you get more features and benefits when the BMS and inverter/charger have comms but you say this is inaccurate yet provide no further info to back it up?

What we post on NL is for the benefit of a wide audience, my goal is to educate and inform and lay out possibilities and options and also learn new stuff - it would be really nice if you do not just say 'Oh this is inaccurate' rather what exactly is inaccurate? and then provide hard data to back up any claims with?

This way we can all learn from each other.

You have to ask yourself why is there a market for ICC and similar control and monitoring software to use with the Axpert type inverters? Why did the Axpert manufacturers start integrating additional hardware for comms with Lithium BMS into their inverters? why did Victron and Deye invest so heavily in the ability for their systems to have comms with various BMS? why did Schneider start rolling out systems capable of talking to the BMS when they were previously doing open loop voltage control in the past? Surely all these efforts across so many providers are not just based on idle speculation or to extract more money from the customers? No one is doubting that voltage control with no comms can work but I struggle when one argues against the facts yet has only limited experience with these complex systems.

May I respectfully say that this is also about perspective, not exactly a truism. There are several statements here that are incorrect from my perspectives . The so-called "integration" are more often about data for decision making whether by machines or humans. I have a DIY set up, but it will give many "industrial" setups a run for their money. I have all the data and the communications you get from any so-called integrated system. I know what each of my lithium battery cell is doing at anytime 24X7. I will like to know what you are able to know or do with your system that others can not do. Maybe you will make a convert of me.

Your suggestion that you are somehow experienced with more "complex systems" than anyone else is basically a brag. It is meaningless to me and presumably many others. Indeed, anytime you have to pull your "experience" to advance your argument, the chances are that you have moved into the region of what the oyinbos will call "bullshit". Otherwise, you will make your point and provide the evidence or advance some logic to support it, not "I know this more than you".

Let's continue to share knowledge here, not bragging right, superiority or "my setup is better than yours". Battery charging and discharging is inherently a very simple technology. It is like filling a bucket. What you can do is to work on how fast or slowly you want to fill the bucket and how full or empty you want the bucket to be. The rest is marketing.

NiyiOmoIyunade:
We are getting close I think.

Let us stick to battery charging.

When the inverter can natively talk to the BMS then all the work is done for you, the BMS can ask the chargers to raise or lower charge voltage and current limits as it sees fit in response to cell level events with no human intervention.

I have a few data centers with Victron & Pylontech backup that have nearly 24/7 power - you will see the BMS instruct the inverter to absorb, float and even discharge/cycle the battery a bit to keep everything going smoothly. The charge voltage setpoints change dynamically as required to keep every single cell happy.

Can you contrive a DIY solution without comms that will dynamically adjust absorb voltages lower if no cell needs balancing? Raise the absorb voltage enough for some cells to balance where necessary? Cycle the battery a bit so that it is not on mains charging 24/7?

All these are seamlessly done when a smart BMS is controlling the charger directly in the Victron world - fixed absorb and float voltages will not cut it in these scenarios and you would have to do a lot more work to achieve thesame goal.

Again fixed voltage control without comms is okay, there is just a lot more precise control possible when inverter/charger and BMS are tightly integrated.

Okay Sir

NiyiOmoIyunade:
Apologies and no offense intended please, I did not even note who made the comments specifically was just responding based on what I thought the question was.

My experience with Deye is still limited but I believe the inverter sizes are speced in Kw - there is a Deye 7.6kw hybrid inverter (model # Sun-7.6K-SG....) and yet another 8kw (model # Sun-8K-SG....) inverter model that is specially designed for the North American market - due to notorious Asian flexibility, we are able to access this wonderful 8kw model at a bargain price despite signed agreements 'au contraire'

MPP also did a similar with their max production by doing 7.2 and then 8kw. Maybe it's due to the reason you stated here

Parallel connection and series connection, which one is better?

..

isangjohnson:
Parallel connection and series connection, which one is better?

since u use 60A Cc, it is likely 150V capped(check though) . 320w panels will give around 45v,.. so 3S3P will be around 135V for your 9pcs 320w panels.

adrusa:


48V nominal. Rarely goes below 52V on LFP even with the AC

48V 600AH LFP is massive. You're enjoying

Anyone got a link where I can buy a portable (300w to 1000w) pure sinewave 12V transformerless inverter with charger function?

Neatly used cyberpower up for sale!

Cyberpower 1.2kva 12v power inverter available for sale. It can power up your basic AC loads like TV , Fan, Laptop, lightening points , sound system etc ..

Condition: Neatly used. Works like new
Location: Lagos but can be waybilled to any state under buyers expense.

Contact,
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[quote author=Valto post

I was actually looking at a case study where four batteries of 12v 200Ah are connected in series to give 48v 200Ah

and another four batteries of 12v 200Ah
are connected in parallel to give 12v 800Ah.

Under an ideal circumstance, which of the two connection will us the best result?

Put the rate of discharge and the lifespan of the battery into consideration.

I saw a write-up in this thread where someone was trying to explain why series connection is the best and another person was also saying parallel is the best.
He said in parallel connection, we should not forget that the more energy you take, the faster the battery discharges.
In other words, rate of discharge is slow in series connection than parallel connection.

Please point to the famous write up...

isangjohnson:
I saw a write-up in this thread where someone was trying to explain why series connection is the best and another person was also saying parallel is the best.
He said in parallel connection, we should not forget that the more energy you take, the faster the battery discharges.
In other words, rate of discharge is slow in series connection than parallel connection.

Pls how do I get a rough estimate if panels, cc, and battery size if all info I have is this:

4 ceiling fans to be used overnight, 10 bulbs, and 2 tvs(42 inches flat screen and 21 inches old type) during weekends.

Thanks

olaolu11:
Pls how do I get a rough estimate if panels, cc, and battery size if all info I have is this:

4 ceiling fans to be used overnight, 10 bulbs, and 2 tvs(42 inches flat screen and 21 inches old type) during weekends.

Thanks

Get the power ratings of each appliances and share the total you got. The ratings should be written on the body of the appliances, share that figure here and you may get help with what your ingredients could look like.

.

isangjohnson:
I saw a write-up in this thread where someone was trying to explain why series connection is the best and another person was also saying parallel is the best.
He said in parallel connection, we should not forget that the more energy you take, the faster the battery discharges.
In other words, rate of discharge is slow in series connection than parallel connection.

48V would be more efficient, by far (in the voice of Trump).

However, you'd be needing extra device to keep the batteries in balance. Therefore, you should install battery balancers from the onset. You can add a desulphator too (this also goes for the 12V system).

fst group 56" ac/dc energy efficient ceiling fan with remote control comes with inbuilt 12V adapter.
can work with 12v to 18v solar panels.
12v battery
directly to 220v source
about 30w highest consumption.
5 speed remote control.
price 21000
whatsapp 0802-057-4628

[quote author=IYGEAL post.

Thanks for your idea

Boss,

The experience I refer to is that I have used Lithium batteries with inverters without comms and just set absorb and float voltages as required and called it a day, I have also done several installs where the BMS and inverter/charger communicate - specifically with Victron equipment and now attempting it with Deye - in the Victron world, once comms are established, the MPPTs and inverters disable/ignore their own internal charge algorithms and start listening to the BMS - they will raise voltage to whatever level the BMS asks and also go full power or throttle current as the BMS asks.

The effect of this scheme where the BMS is the one setting the charge voltage and varying it as needed is that the specific needs of each cell in a battery pack are catered to - some days the cells need no balancing so the charge voltage is set much lower by the BMS, other days balancing is required and the BMS instructs all chargers in the system to raise the charge voltage accordingly - I consider this approach superior because the components that bleed/balance cells do only the minimum required work, the cells themselves are not unnecessarily stressed or raised to a high voltage unless required.

Without comms, you set a fixed charge profile which is either conservative or aggressive and if you keep tweaking it you may get the right mix for your situation, with comms between BMS and chargers you can get the exact charge voltage required per time and have all this varied as required by the BMS with zero human involvement - you just set, forget and enjoy. As the battery ages or usage profile changes, the BMS will respond dynamically by asking the chargers in the system to provide whatever voltage the system needs.

Because I have used both systems, I can say I prefer the one with comms because of the more precise control available, as far as I know, your good self and Oga Ojeysky have not integrated a BMS with your inverters and chargers for the purpose of BMS controlled battery charging and if you have, I have never read you state so on this forum. The good work you have done with system monitoring and automation does not help with battery charging. I am not disparaging your experience but rather saying if you used the other method with comms between BMS and battery chargers, you would very likely see that it was a better way.

The ability for the BMS to communicate the exact battery state of charge for the purpose of instructing the inverter when to disconnect loads is also another resounding benefit - in my Pylon installs I can ensure the cells are never cycled below 80% DoD, if using voltage as an indicator of SoC, you can only guess close but never exact as a specific voltage can indicate various SoC levels depending on what is going on with the system at that time.

As you asked for data, I provided two screenshots from my home system ;

Pic 1 - Pylontech Battery SoC at 97% with the dynamic charge voltage currently set at 51.87v whereas max charge voltage per battery specs is ~53.4v - in nearly two years of use, the batteries have never needed more than ~52.3v to get to 100% full - If I had set 53.4v fixed voltage and no comms, you wonder what work the BMS and balancers would do to burn off excess energy and keep the cells from stress.

To put the numbers in perspective, Pylontech is a 15S battery made up of 15pcs of 3.2v nominal cells in series.

Pic 2 - Excerpt from one my Victron MPPT chargers showing that the work state is 'External Control' by the BMS. In this state, the charger ignores whatever charge profile I had set and charges strictly as the BMS commands.

adrusa:


May I respectfully say that this is also about perspective, not exactly a truism. There are several statements here that are incorrect from my perspectives . The so-called "integration" are more often about data for decision making whether by machines or humans. I have a DIY set up, but it will give many "industrial" setups a run for their money. I have all the data and the communications you get from any so-called integrated system. I know what each of my lithium battery cell is doing at anytime 24X7. I will like to know what you are able to know or do with your system that others can not do. Maybe you will make a convert of me.

Your suggestion that you are somehow experienced with more "complex systems" than anyone else is basically a brag. It is meaningless to me and presumably many others. Indeed, anytime you have to pull your "experience" to advance your argument, the chances are that you have moved into the region of what the oyinbos will call "bullshit". Otherwise, you will make your point and provide the evidence or advance some logic to support it, not "I know this more than you".

Let's continue to share knowledge here, not bragging right, superiority or "my setup is better than yours". Battery charging and discharging is inherently a very simple technology. It is like filling a bucket. What you can do is to work on how fast or slowly you want to fill the bucket and how full or empty you want the bucket to be. The rest is marketing.

For Sale

1. Brand New BMV-712 for sale...selling because I decided to use the lynx system (power-in, shunt and distributor).
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ojeysky:


Get the power ratings of each appliances and share the total you got. The ratings should be written on the body of the appliances, share that figure here and you may get help with what your ingredients could look like.

I asked but he thinks everything is just straightforward.

Since ur curious to know.
I run 2 non inverter ACs on solar. 1.5 Hp in my sitting room (which come on day time from 10am to 4pm), 1hp in my bedroom (almost 24hrs or as I desire )
Am not yet on lithium technology because my 3yr old 1000AH lead acid serves me well on 6kw PV. My servere over nite dip has never gone below 48.4v in the last 3yr. I am practically of grid. My AEDC recharge of 3k still dey prepaid for almost a year now. I ask you do you think I need to buy electricity from dem? That their yeye 3k can only last me 3 to 4 days of using my bedroom AC.

So it is renewable all the way ooo. No regrets, except for fake products in the market.

mctfopt:
Genuinely out of curiosity, is anyone running ACs or AC off their renewable system? If yes, what is the minimum battery and PV they running it off and how has the performance being?

Any real life experience from anyone who has used any 5000BTU window unit air-conditioner?


https://www.youtube.com/watch?v=7UHLvVj_glQ

efuro:
Since ur curious to know.
I run 2 non inverter ACs on solar. 1.5 Hp in my sitting room (which come on day time from 10am to 4pm), 1hp in my bedroom (almost 24hrs or as I desire )
Am not yet on lithium technology because my 3yr old 1000AH lead acid serves me well on 6kw PV. My servere over nite dip has never gone below 48.4v in the last 3yr. I am practically of grid. My AEDC recharge of 3k still dey prepaid for almost a year now. I ask you do you think I need to buy electricity from dem? That their yeye 3k can only last me 3 to 4 days of using my bedroom AC.

So it is renewable all the way ooo. No regrets, except for fake products in the market.

That's good to hear. You guys are making this decision easy

What's the brand of the 2V 1000AH (I'm assuming it's 2v) and what system voltage are you running?

Those big capacity batteries usually pack a punch.

mctfopt:
Any real life experience from anyone who has used any 5000BTU window unit air-conditioner?

i have not used it, but dont waste money on that bro.

Not using 2v batteries oo. I run my setup on 20 solid units of 200A batteries at 48v
That large volume of batteries are well balanced using looping apart from using 5 equalisers. This prevent one battery running away from others. They dip and grow charge almost equally.

mctfopt:


That's good to hear. You guys are making this decision easy

What's the brand of the 2V 1000AH (I'm assuming it's 2v) and what system voltage are you running?

Those big capacity batteries usually pack a punch.