mctfopt:


Nah, I don't use the brand. So I've got no firsthand experience on how their battery perform.

Aight bro...Thanks for ur time

ojeysky:


I think either ceasar or adrusa has experience, I do not have one

Aight... Thanks boss

ojeysky:
Hello folks, most of the time I now get my battery filled up by noon and I wonder what else folks use their excess power for? Am considering a geyser but does that work in this part of the world? Anyone using it?

Wow, see levels.
Oversized array, i supz.

Run 2 or 3 Ac's... your eye go clear.

Or consider selling off a couple of panels.

Really great review and breakdown.
Kinda confirmed my suspicion as in things like this, there's always a tradeoff.
But from your breakdown and it's price, I think the tradeoff is really not that bad.... As long as they don't give issues or constant headache for a good number of years, it might not be a bad buy.

Ever heard of this Nigerian company "Pelton Battery"? Saw them online when I was looking into somethings... I'm not sure they are still operating though.

Thanks alot for your review boss. Really appreciate it

NiyiOmoIyunade:
I have installed about 10 units of the so called 48v 200ah Felicity.

The technical literature actually rates the battery at 48v 7.5kwh so I dont know how how sellers managed to call it 48v 200Ah.

I also ran a discharge test at one customer location and I was able to pull out about 5kwh measured at the inverter AC out - this equates to about 5.5kwh of DC energy before the battery started to scream low battery.

If you take this point as 90% DoD then the battery is truly rated at 6kwh at 100% capacity and you can safely take out about 4.5kwh if the desire is to stay above 20% DoD for longevity - at the point point of screaming battery pack was at 49.4v or so so 3.08v per cell.

To help put all the numbers in perspective, I do not charge a Lithium battery to 100% full - our max voltage is 56.8 vs Felicity's recommended 57.6v

In summary the battery rated 48v 200ah or better yet 7.5kwh has about 4.5kwh of useable energy in it. So really a 48v 94ah battery for effective capacity. If you buy it with these facts in mind, you won't be dissappointed. If you run the battery at the discharge rates suitable for lead acid, you should have no trouble in the near term. You really must look into a LVD mechanism at around 50v so you don't overdrain the battery

For the savvy individuals, I do not believe that there is another 1kwh+ of useable energy hiding behind that extra 0.8v of charge - it would be great to interrogate the BMS of which Adrusa who has ripped one out of the battery case has refused to volunteer any details to help us know what BMS it is and crack it open.

adrusa:


I think it is a good battery. The capacity may have been overstated, but I consider it a good buy. Their 200AH 48V actually has 120AH battery in it, but it cuts of at pretty high voltage around 49V which is about 3v per cell. That is too high in my opinion and that means you are probably getting about 70-80% of useable capacity out of the battery. Bypassing their BMS can help you get a little more from the battery if you like deep discharges.

Thanks for the advice boss... Would surely look into it.

Quick one boss... From your experience, can one comfortably get 5-6 yrs on the batteries without any headaches, even while going up to 90% DoD?

NiyiOmoIyunade:
I have installed about 10 units of the so called 48v 200ah Felicity.

The technical literature actually rates the battery at 48v 7.5kwh so I dont know how how sellers managed to call it 48v 200Ah.

I also ran a discharge test at one customer location and I was able to pull out about 5kwh measured at the inverter AC out - this equates to about 5.5kwh of DC energy before the battery started to scream low battery.

If you take this point as 90% DoD then the battery is truly rated at 6kwh at 100% capacity and you can safely take out about 4.5kwh if the desire is to stay above 20% DoD for longevity - at the point point of screaming battery pack was at 49.4v or so so 3.08v per cell.

To help put all the numbers in perspective I do not charge a Lithium battery to 100% full - our max voltage is 56.8 vs Felicity's recommended 57.6v

In summary the battery rated 48v 200ah or better yet 7.5kwh has about 4.5kwh of useable energy in it. So really a 48v 94ah battery for effective capacity. If you buy it with these facts in mind, you won't be dissappointed. If you run the battery at the discharge rates suitable for lead acid, you should have no trouble in the near term. You really must look into a LVD mechanism at around 50v so you don't overdrain the battery

For the savvy individuals, I do not believe that there is another 1kwh+ of useable energy hiding behind that extra 0.8v of charge - it would be great to interrogate the BMS of which Adrusa who has ripped one out of the battery case has refused to volunteer any details to help us know what BMS it is and crack it open.

That is 3.55v it will definitely get the cells to 100% easily and fast. If you do 3.4v then maybe it won't make the 100% capacity fast enough before the sunlight goes off. A less than 3.4v is what will sure ensure below 100% capacity capacity for Lifepo4. Max I do on my cells is 55v(3.43 per cell) yet it still makes 100% charge most time but I don't want to do less because I need to take advantage of the short sun hours as well

earthrealm:


Wow, see levels.
Oversized array, i supz.

Run 2 or 3 Ac's... your eye go clear.

Or consider selling off a couple of panels.

My array is even undersized, my Deye takes 10kw+ standard, am still at a little above 5kw

On my Pylontechs I do 3.46v per cell. Pylontech is 15s so a total of about 52v.

I am aided in this by being able to see the individual cell voltages and ensure that they all get to nearly full.

The Felicity BMS is yet a blackbox to me so I played safe with 56.8v. I may consider pushing the voltage further down 3.47 x 16s for a total of 55.5v - this does seem really low compared to manufacturers recommend 57.6v - a full 2v delta!!! Makes you wonder if their design goal is to kill off their cells fairly early

ojeysky:


That is 3.55v it will definitely get the cells to 100% easily and fast. If you do 3.4v then maybe it won't make the 100% capacity fast enough before the sunlight goes off. A less than 3.4v is what will sure ensure below 100% capacity capacity for Lifepo4. Max I do on my cells is 55v(3.43 per cell) yet it still makes 100% charge most time but I don't want to do less because I need to take advantage of the short sun hours as well

Thank you for the review.

Due to the relatively flat charge/discharge curves of LiFePo4 chemistry, your test was within 95%-97% DOD.

At 3v/cell, the LiFePo4 battery has only 2-3% of its rated energy left during discharge. At 3.45v/cell, the battery is 99% full when charging.

To operate within 80% DOD, charge the battery to 3.4v/cell and discharge to 3.1v/cell at 1C rate or below.

NiyiOmoIyunade:
I have installed about 10 units of the so called 48v 200ah Felicity.

The technical literature actually rates the battery at 48v 7.5kwh so I dont know how how sellers managed to call it 48v 200Ah.

I also ran a discharge test at one customer location and I was able to pull out about 5kwh measured at the inverter AC out - this equates to about 5.5kwh of DC energy before the battery started to scream low battery.

If you take this point as 90% DoD then the battery is truly rated at 6kwh at 100% capacity and you can safely take out about 4.5kwh if the desire is to stay above 20% DoD for longevity - at the point point of screaming battery pack was at 49.4v or so so 3.08v per cell.

To help put all the numbers in perspective, I do not charge a Lithium battery to 100% full - our max voltage is 56.8 vs Felicity's recommended 57.6v

In summary the battery rated 48v 200ah or better yet 7.5kwh has about 4.5kwh of useable energy in it. So really a 48v 94ah battery for effective capacity. If you buy it with these facts in mind, you won't be dissappointed. If you run the battery at the discharge rates suitable for lead acid, you should have no trouble in the near term. You really must look into a LVD mechanism at around 50v so you don't overdrain the battery

For the savvy individuals, I do not believe that there is another 1kwh+ of useable energy hiding behind that extra 0.8v of charge - it would be great to interrogate the BMS of which Adrusa who has ripped one out of the battery case has refused to volunteer any details to help us know what BMS it is and crack it open.

jamesid29:

Thanks for the advice boss... Would surely look into it.

Quick one boss... From your experience, can one comfortably get 5-6 yrs on the batteries without any headaches, even while going up to 90% DoD?

My cells are just 6 months old and I do 60 to 80% DOD daily (occasionally 90%). The cells have not deviated from their performance the first time I bought them. Now 6 months is a very short time for the lifetime of the cells. I know folks here have used their littium chemistry for over 2 years, we've not heard of 5 years testimonials yet, cos it seem most of us started active use in the last 3 years.

NiyiOmoIyunade:
On my Pylontechs I do 3.46v per cell. Pylontech is 15s so a total of about 52v.

I am aided in this by being able to see the individual cell voltages and ensure that they all get to nearly full.

The Felicity BMS is yet a blackbox to me so I played safe with 56.8v. I may consider pushing the voltage further down 3.47 x 16s for a total of 55.5v - this does seem really low compared to manufacturers recommend 57.6v - a full 2v delta!!! Makes you wonder if their design goal is to kill off their cells fairly early

I think they just adviced on max charge of 3.6v I expect they should have given a range and not give the impression that one has to charge at 3.6v

While the LifePo4 chemistry can accept a charge of 3.6v/cell without damaging the battery, there is very little energy stored above 3.45v - only about 1%. This is the reason why the cell voltage rises sharply after 3.45v even with very low charge current.

NiyiOmoIyunade:
On my Pylontechs I do 3.46v per cell. Pylontech is 15s so a total of about 52v.

I am aided in this by being able to see the individual cell voltages and ensure that they all get to nearly full.

The Felicity BMS is yet a blackbox to me so I played safe with 56.8v. I may consider pushing the voltage further down 3.47 x 16s for a total of 55.5v - this does seem really low compared to manufacturers recommend 57.6v - a full 2v delta!!! Makes you wonder if their design goal is to kill off their cells fairly early

My Oga Dapsyra.

Thank you very much for this, very useful reference information to have.

I can corroborate these numbers because on my Pylontechs the cells are still above 15% DoD at 3.2v per cell but BMS would rudely cutoff the battery of you try to place a large load when there is below 12% capacity left.

Everytime you drain below 94% DoD, the BMS logs this fact and it counts against your warranty ���

dapsyra:
Thank you for the review.

Due to the relatively flat charge/discharge curves of LiFePo4 chemistry, your test was within 95%-97% DOD.

At 3v/cell, the LiFePo4 battery has only 2-3% of its rated energy left during discharge. At 3.45v/cell, the battery is 99% full when charging.

To operate within 80% DOD, charge the battery to 3.4v/cell and discharge to 3.1v/cell at 1C rate or below.

Ojeysky, your CellDiff is not looking good. Did you top balance the cells before using them?

ojeysky:


My cells are just 6 months old and I do 60 to 80% DOD daily (occasionally 90%). The cells have not deviated from their performance the first time I bought them. Now 6 months is a very short time for the lifetime of the cells. I know folks here have used their littium chemistry for over 2 years, we've not heard of 5 years testimonials yet, cos it seem most of us started active use in the last 3 years.

ojeysky:


My cells are just 6 months old and I do 60 to 80% DOD daily (occasionally 90%). The cells have not deviated from their performance the first time I bought them. Now 6 months is a very short time for the lifetime of the cells. I know folks here have used their littium chemistry for over 2 years, we've not heard of 5 years testimonials yet, cos it seem most of us started active use in the last 3 years.

Nice review
DIY Lifepo4 pack is taking over..

dapsyra:
Ojeysky, your CellDiff is not looking good. Did you top balance the cells before using them?

It's at 90% capacity at the time of taking that pics o and taking almost 30A at that time. Attached is pics at 98%. Yes maybe it's not absolutely balanced but not deviated either.

jamesid29:

Thanks for the advice boss... Would surely look into it.

Quick one boss... From your experience, can one comfortably get 5-6 yrs on the batteries without any headaches, even while going up to 90% DoD?

Now you are not seeking for my experience, you are asking me to make a prediction, to foretell the future. That is not my area of concentration/calling. However, going by what I have seen over the last one and half years in the LFP land, I will expect it to last that long or more. About one and a half years, there is no evidence of reduction in capacity, efficiency or voltage. The batteries are still performing just like the day I installed them. It may be an indication of what to expect, but who knows what surprises are lurking in the corner.

ojeysky:


My array is even undersized, my Deye takes 10kw+ standard, am still at a little above 5kw

Does this imply you use no extra cc?

IYGEAL:


Does this imply you use no extra cc?

Not at all the CCs are all in my Deye hybrid inverter. That thing is a monster Bro

ojeysky:


Not at all the CCs are all in my Deye hybrid inverter. That thing is a monster Bro

That's awesome.

ojeysky:


Not at all the CCs are all in my Deye hybrid inverter. That thing is a monster Bro

How many CCs actually?

IYGEAL:


How many CCs actually?

It has dual mppt with each capable of doing 22A (11A per string) 5kw each. Note that it's a high Voc inverter

ojeysky:


It has dual mppt with each capable of doing 22A (11A per string) 5kw each. Note that it's a high Voc inverter

I see. Makes sense. You'd have reduced spend on cabling.

So each is rated 95Amps of actual charging current that adds up to the 190A overall? I find the hybrid interesting.

ojeysky:


Ah I remember your airfryer videos yesterday then I started googling for a good airfryer, what's the spec/cost of yours and experience on its performance?

4.5 liters and I purchased it at a store that brings in slightly dented items in Lekki. I paid 40k at the time. Much more expensive today

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ojeysky:


It has dual mppt with each capable of doing 22A (11A per string) 5kw each. Note that it's a high Voc inverter

How early does the deye wake up?
Seems the achilles heel of these hv hybrids is late wake up, usually after 9am,
Seen same pattern on phocos and Sorotec,