ceaser:
.

@ Adrusa. I hope to take delivery of an extra 12v 100ah LFP tomorrow. I needed 120ah but 100ah was the last samurai that I was lucky to meet left. Damn, he was even sold out on 24v and 48v.

ceaser:


Fret not.

What he means is "good dangerous" rather than "dangerous dangerous" or "bad dangerous"

He simply means that you get carried away by the sustained voltage over a long time despite load that you won't border to even check out the voltage again. At that point, you may miss when the voltage starts to drop on the meter.

With Lead chemistry, once you put a big load on it, the battery drops by 1volt or less. Then the volt drop with use and time is a linear relationship. However in the case of LFP(compared with Lead for capacity for voltage), if the battery was fully charged to 13.3v (for a 12v LFP battery), you won't really notice the drop in voltage and it can remain at that 13.3v for several hours before you notice any drop. That's the characteristic discharge curve of lithium.

Having said that, the BMS will do justice to ensure you don't overdischarge your battery.

@ Adrusa. I hope to take delivery of an extra 12v 100ah LFP tomorrow. I needed 120ah but 100ah was the last samurai that I was lucky to meet left. Damn, he was even sold out on 24v and 48v.

Topmost11:
How much is the 12v 100ah going for?

ceaser:


110k, 3k shipping.

ceaser:


Fret not.

What he means is "good dangerous" rather than "dangerous dangerous" or "bad dangerous"

He simply means that you get carried away by the sustained voltage over a long time despite load that you won't border to even check out the voltage again. At that point, you may miss when the voltage starts to drop on the meter.

With Lead chemistry, once you put a big load on it, the battery drops by 1volt or less. Then the volt drop with use and time is a linear relationship. However in the case of LFP(compared with Lead for capacity for voltage), if the battery was fully charged to 13.3v (for a 12v LFP battery), you won't really notice the drop in voltage and it can remain at that 13.3v for several hours before you notice any drop. That's the characteristic discharge curve of lithium.

Having said that, the BMS will do justice to ensure you don't overdischarge your battery.

@ Adrusa. I hope to take delivery of an extra 12v 100ah LFP tomorrow. I needed 120ah but 100ah was the last samurai that I was lucky to meet left. Damn, he was even sold out on 24v and 48v.

Dam5reey:
Simply put, in order to use LifePO4, I must change my inverter to one with custom settings, that I can change float, bulk and Low voltage cut off..
That's why I learnt from several YouTube videos, what if you don't have time to babysit, battery monitoring is not an option

Dam5reey:
Simply put, in order to use LifePO4, I must change my inverter to one with custom settings, that I can change float, bulk and Low voltage cut off..
That's why I learnt from several YouTube videos, what if you don't have time to babysit, battery monitoring is not an option

Dam5reey:
Simply put, in order to use LifePO4, I must change my inverter to one with custom settings, that I can change float, bulk and Low voltage cut off..
That's why I learnt from several YouTube videos, what if you don't have time to babysit, battery monitoring is not an option

earthrealm:


Could you list any of the chinese /indian inverters...that are lithium batt friendly?

earthrealm:


Could you list any of the chinese /indian inverters...that are lithium batt friendly?

Dam5reey:


To me it's simple, any inverter that has custom settings to set Bulk, Float, and LVD, and also disable equalization, will do the job.. you can even bypass the BMS by connecting directly to Battery terminals. Since your charger will handle Overcharge and Discharge voltage.

I plan to get this: and try out the 24V 200AH LifePO4.

https://a.aliexpress.com/_B05a7N
The seller sent me the Manual in PDF format, it will do just fine..

ojeysky:


Don't do that, your inverter will be working with cumulative voltage while the BMS will work with individual cell voltage. The latter is more important and critical.

I will also suggest you don't go for that inverter (the max array is 1kw), a 3kva felicity hybrid is better. Overall if you can, go for MPP or Axpert product

Dam5reey:


I understand what you meant, The batteries will only have different voltages when you use Higher current, I'm only discharging at 10amp maximum

Even active balancer are useless when you have low charge and discharging rate, also when the batteries are of the same age and are still new.

BmS and active balancer are only useful for Ageing LifePO4, like the BYD used one..

The 1KW is overkill already for my application, I'm not planning to run AC on it anytime soon..

My total consumption is less than 2kwh daily.

I'm switching to Energy efficient devices, Instead of using home theater I opt for 30watts Bluetooth speakers no be music I wan hear
Sound Core motion +

ojeysky:


Hmm... that isn't accurate, I can agree with active balancer but not for BMS. They are useful for any age of battery. While there is a chance that well matched cells (with max 0.03 difference) will usually not differ significantly during charge and discharge, the BMS also will continue to contribute to that.

The other thing is that yes you may be able to get away with the bottom voltage through your inverter but setting a safe top voltage without a balancer in place to prevent overcharge will be risky.

As to the inverter, it's an axpert clone just like felicity and if the same (or less) amount will get you a higher spec why not. You never can tell what the future brings with your consumption. If there is no extra cost for getting more value for money, one naturally should go for it.

BetaTechnicians:

How much is the felicity?
What's the full specs?

ojeysky:


Hmm... that isn't accurate, I can agree with active balancer but not for BMS. They are useful for any age of battery. While there is a chance that well matched cells (with max 0.03 difference) will usually not differ significantly during charge and discharge, the BMS also will continue to contribute to that.

The other thing is that yes you may be able to get away with the bottom voltage through your inverter but setting a safe top voltage without a BMS in place to prevent overcharge will be risky.

As to the inverter, it's an axpert clone just like felicity and if the same (or less) amount will get you a higher spec why not. You never can tell what the future brings with your consumption. If there is no extra cost for getting more value for money, one naturally should go for it.

Dam5reey:


The inverter will do that as well, the essence of BMS is to automatically disconnect as a set voltages, if your inverter does that for your then there is no point..

it is more risky when your BMS and Inverter does not communicate with each other

I'm not saying don't use BMS, For me it will be connected to batteries, but bypassed for charge and discharge.

queenfav:
I am.in ph.The panels are not dirty cos it rains here and that washes off dust from it.our set up is as follows
-

2 pcs 200ah mpower battery
4 pcs 300w mono panels
prag pure sine wave 2.5kva inverter
40a epev er mppt charge controller

.
please how many more panels do u think we should add to the setup to achieve a fast charge this rainy season?Total average daily load is-

Either hisense tv of 200w or hisense fridge 150w
(we don't use both at once)
2 Fans -55w each
lights approx-48w
Electric fence charge controller-15w
Hood range/chimney (occasionally used during d day-218w
gotv -30w (not on always)

queenfav:
You know when an Igbo man brings out 700k for solar setup,no be small expectation o...
With some little hacks here and there you could have saved a couple hundred thousands for that same setup. Or gotten more batteries/panels additional.

...thinking of doing more panels,pls how many do u think we can add based on the info i provided above
You can add a couple more so long as you don't exceed the max Voc voltage of your MPPT CC. I find it a wise thing to over size pv by as much as 30-50% if possible


....I would also appreciate tips and practices on how to ensure a good battery life always
-Try to never go below 50% Dod,
-avoid discharging your batteries at rates of more than 10% of its rated "Ahr" capacity. The smaller the number the better..

ojeysky:


You can pm me. - FWIW am not an installer but can advice on how I go about my set-ups.

queenfav:
u are right bro.We have to minimize heavy loads on it.pls how much did u get the battery meter?

queenfav:
wow,make Corona virus end first.I will show it to hubby so we can get one, afterwards call d solar installer to come fix it.Thanks bro.

Valto:
wow what an intelligent smart woman . really determined to make the home better. your hubby is a lucky man!

Topmaike007:
visit this forum and thank me later...


Www.diysolarforum.com

ojeysky:


Bought mine 135k. Fyi it not my topmost hybrid, but it's what I use for now and it serves

ojeysky:


Hmmm... Will look forward to your experience on this...my gut tells me that the inverter won't be optimal with this compared to a BMS.

.

Hmm....I don't think so, yes it will be good to have a BMS that interacts with inverter but I don't think lack of that is more risky than not having BMS in place.



Not sure what use a BMS will then be if you already bypass it. Ultimately it's a choice, but will be good to know if you have this set-up already, if not do share your experience after a few months of usage.

Trippledots:


At arena in oshodi one shop was calling 3k abi 5k late last year

Trippledots:


Does your inverter go off on low battery? If it doesn't, What is d lowest value you have seen your battery voltage by morning before your charge controller wakes up?

Trippledots:


Hubby de e own oh, e no knw say small gbese de cook wait am for one corner May God bless all the good hubbys oh

Trippledots:


That's Will Prowse or so right? From YT