₦airaland Forum

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.

Bros thanks for setting the rules of not making this personal and let's both observe it Bro, no doubt there are other features as I earlier mentioned, but my response I was specific on charging. Can a littium be charged optimally through a BMS that does not have Comms with the inverter? Is the main question.

You asked why inverter talking to BMS is invested upon, IMO opinion, it's more towards better automation and control. For instance in my DIY BMS I may get to make certain adjustment on my inverter settings depending on what is observed on the individual cells and that's why I can't use BMS that cannot inform me about status of each cells. Will I achieve an optimal charge on both? my answer remains a yes Sir, but is BMS talking to inverter not good? absolutely not and like I said it's a good to have.

NiyiOmoIyunade:
No I sold 4 units out of my 20 Pylontechs and replaced with 32pcs 3.2v 280Ah Lishens.

The remaining 16 Pylon US2000s will continue to run off my 15kva Victron inverter while the Deye 8kw will be paired with the 48v 560Ah of Lishens.

I have contrived an arrangement where the 15kva Victron will transfer loads over to the 8kw Deye once the Pylontechs are at 40% SoC - this is essentially replacing my Generator autostart if I run loads aggressively (4 ACs late into the evening)

In the past heavy loads taking the battery to 35% SoC would trigger a Gen start for 1 hour, now instead of a Gen start it will trigger a load transfer to the Deye which will then run to 20% SoC before starting the Generator.

From 48kwh of Pylontech and 38kwh useable energy, I now have a combined 67kwh battery bank of which I can use 60kwh.

See attached pics when I took delivery of the cells and trying to figure out how best to arrange them.

That set-up will almost guarantee that your Gen will mostly not get triggered again. So it means you will be using the Gen port on Deye or what do you intend to use for the trigger?

NiyiOmoIyunade:
Is this not just a conversion problem for the OP?

10Kva is about 8Kw where the power factor is assumed to be 0.8

Ah yes, that could probably be the case.

adrusa:
I honestly don't believe a word of these very technical and deliberately confusing points. And I'm not talking about what you wrote, but what the battery, BMS and charger manufacturers have clearly made you to believe. I continue to believe that most of these talks are basically to make you pay more for pre-existing technology given a new name. One thing I'm prepared to concede is that battery manufacturers may set stringent conditions for their batteries as a way of ensuring that warranty claims are not too burdensome. If a car can do 100Km/h, the manufacturers will be happy to limit you to 50Km/h knowing that the chances of damage is much lower at that speed. So, they may tell you not to charge at 1C or 0.5C or whatever tickles their fancies. With a good BMS, you can actually be a bit liberal with your lithium batteries. Your BMS should stand between your battery and any problem. The chances are that you will be seriously under-utilizing your batteries if you strictly follow manufacturers guidelines. Lithium can actually take as high as 1C charging current. That is why phone manufacturers are doing all sorts of high current charging, warp charging, flash charging, superspeed charging etc.

I also understand why installers may want to push premium and extra-protected system to clients. It reduces support calls and increases your business reputations. But, as a DIY guy, I have better ways to spend my money than buying bogus technologies that add little or nothing to my setup. I have used Victron "Lithium Profile" before and I see no advantage over my current setup with Outback and Felicity CCs and Inverters.

There was a time we used to talk about DIY LFP Vs premiums and there was a time I would have responded to Oga neyo that the idea he has isn't accurate. There are a few scenarios where littium cells may not charge optimally but none of them has anything to do with the inverter talking to the BMS or not.

Having the inverter talk to the BMS is a good to have as you get to see the individual cell voltages, and maybe set triggers based on individual cell status apart from that, it's a charge and stop that remains. Even when I was using Felicity and MPP which both has float bugs, I could still charge my lithium optimally by working around the voltage to avoid the float bug.

Oshomo12:
You did not get my question,
Deye has 10kva(rated also 8kw), 6.5kva(also rated 5kw) etc.

Which deye model are you using, SUN-7.6K?

I have SUN-8K do you have a reference where it's stated that it's 10kva? Because I think that is actually the max PV string input.

Oshomo12:
I need clarification here, 10kva (8kw), or 8kva, which one are you using? cos I am seeing 8kw

8kw I no type 10kva o....8kw Deye inverter

mctfopt:
This is awesome to hear. The 5.2kw PV is it premium make or just Chinese type? I do see Deye online, didn't know they make really cool inverters. My neighbour just had these bad boys delivered.

280w X 9 - Sunfit panels
380w x7 - Prime panels

Both are made in china...Deye inverters has started showing up more in naija....I know someone locally who now sells 8kw for 860 to 880k

Your neighbor Sabi be that. Those looks like 280 or 300ah cells. You both Enjoy!

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?

I run 2 ACs, they are both thermocool 1.5hp, one is inverter AC and the other is normal. I currently have 280AH LFP 48v (not the nominal voltage) with 5.2kw PV and a Deye 8kw. They serve the household appliances not just the ACs

Clean ride still available

Ride is neat and clean

ojeysky:
I have got 2 brand new BMV 712 with temp sensor for grabs. 125k each

Q/A
Is this the victron BMV 712 with Bluetooth features?
Yes
Is the price negotiable?
No price is firm Sir/Ma
Does the price include shipping?
No it doesn't, but I can waybill to any part of the country at buyer's cost.

Still available

ojeysky:
A few R3 Basic DIY 6.5k for unit price and 6k for multiple(>3). Can flash with tasmota before shipping for those interested

Still available

Redstarex seem to have resumed, but men vitafoam dey jolly jolly

Still very much available for sale

Still available for buy

Clean Accident free it is

microgiant:
Thanks, I will do as you say.

But I have already placed order for PowMr 60a MPPT.

Someone had it up for sale in this thread.. Hope you didn't miss that

Interested? Call

Still very much available

Clean full option, let's deal

zeestone99:
Ship with us $375usd per cbm.

You can visit us @ 10c ajanaku off salvation rd opebi lagos.

You highlighted the fx rate thought you wanted to offer a better rate? Does your shipping rate include custom?

Dam5reey:
Not Lifepo4 na, are they new cells, this is good for powerbank.. or small powerwall.

If you browse previous pages on this thread you will be amazed at huge banks that people build off that. I hail patience of those folks but certainly don't envy them

Still available if interested

Clean highlander still available

Still available for purchase

Clean ride still available

Clean Accident free ride

ceaser:
I have all these features thru the smart life app too. The prolem is that it doesn't seem to have a "battery voltage level status" in the option menu.

Also I don't k know if there is any device in the purview of the tuya or sonoff that act as a sensor for battery voltage and can be integrated with the smart switches thru the app the way you will do with "smart temperature or humidity meters" that integrates with switches controlling HVAC on the app.



Can the devices also work with the smart life app? When tasmota is flashed, does it get rid of its ability to use "tuya, sonoff app, smart life app and other apps like that?

I may need some from you once I'm able to get my bearings with this lack of inverter.

Tasmota is a whole different firmware from the stock version so yes sonoff app will not work with it, have not used tuya or smart life so don't know if those will work.

Still available for sale

Still available for sale

Still very much available

idsolar:
My good people, long time. Please between this 3 hybrid inverters which one to go for, functionality and rugged wise?
1. Must 3kva 24v
2. Sorotec 3kva 24v
3. Growatts 3kva 24v
Thanks for your views

2 and 3 are better but for remote monitoring features i will suggest you do growatt