adrusa:


Lithium are not supposed to float. It is bulk and then stop. The idea of a float charge is to account for lead acid self discharge which is minimal for Lithium. The recommendation is to set your bulk, absorption, float and equalization voltages at the same value which depends on how you want to drive your battery. I set everything to 55V for my system 16s batteries. You set equalization voltage at float as double security since equalization will rapidly destroy lithium. You must disable equalization on your charger also.

Felicity has 16 cells.

I use node red and a contactor to cut off my inverter on lithium at 50V. I have not really looked into hardware LVD. Others may advise.

i have monitored charging behaviour of smartphones, including premium brands, once the battery gets into the higher 70s and 80s, charging current drops considerably. and at 100% some current is still seen to be sent to the phone. Maybe to keep the phone alive or to sort of float the battery.

but there is definitely some current derating as soon as the lithium cell nears full charge.

Tolutopsy:


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Brand new Suoer 2000w inverter with 20a charging function.

I bought it for my personal use, but i never got to use it.

Idle current is 0.4a

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Depending on your location, items can be brought down to a popular bustop for you, at no extra charge.

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tonididdy:

Good morning boss man.
Abeg draft that your graph for series parrarel connection mix.
(I just got a 4th panel), thanks
Please.

Ahh, bros
Congrats... I think say by now you go don become guru for this stuff

The 2 ends with pointing arrow should go to yyour CC.

odimbannamdi:


Still available?

Yes,still available

Trippledots:


i have monitored charging behaviour of smartphones, including premium brands, once the battery gets into the higher 70s and 80s, charging current drops considerably. and at 100% some current is still seen to be sent to the phone. Maybe to keep the phone alive or to sort of float the battery.

but there is definitely some current derating as soon as the lithium cell nears full charge.

You are right, there is a reduction in the current the battery is taking as it gets charged and it's internal resistance increases. But, that is not the same as float. That is still bulk/absorption.

If your phone is on, it uses some power and that will be supplied from your charger rather than the internal battery, so your charger may really never read zero. But, if the phone is off, you may see zero reading.

When lithium battery is full, the current read zero. At least that is what mine does.

ojeysky:


I know someone who has the attached for 50k/60k it's 100A/150A with 1A/1.5A balance

Should've stated the current. At least 200A. Thank you very much for posting this.

You got a shock when you touched the positive battery terminal.

It wasn't because the inverter was not grounded. If anything, you will get a shock while touching the positive terminal because it is grounded !

Grounding prevents you from getting shocked only if you touch the metal casing.

It's possible that the AC output of the inverter is somehow coupled with the DC input possibly through the transformer.

Ceaser01:


@ Bolded. You're absolutely correct. It's 48 volt system and I don't think the inverter has earthing. My own inverter has a scr3w point on the casing for earth wire and it came bundled with the special wire to use for the scr3w point.

I'll instruct the guy to check continuity between the building wirings to check for shorts. I believe all appliances should be unplugged from all sockets and heater fuses switched off at the Distribution Box before commencing this trouble shooting.

Thanks for the wonderful inputs.

Posting with the alternate profile. SpamBot went on overdrive again when I posted this response. Maybe it's my use of the word "scr3w" in it's unaltered form.

mctfopt:



Should've stated the current. At least 200A. Thank you very much for posting this.

Anti BMS 200A 7-21s available

JUO:
Anti BMS 200A 7-21s available

Does it have balance current in the range of 1A to 2A? If yes, how much?

odimbannamdi:


I think this was the same problem Abdomox was having with his 2 units of newly installed Luminous tubular batteries. The electrolyte was gauged beyond the recommended level, and he had to drain out nearly a litre of it before things resolved.

The guy should follow the steps you highlighted and inform the house. I also remember earthrealm saying something about most inverters being incapable of effective charging a flooded battery. I think one has to be specific in inverter selection when using a flooded battery

Regarding the emboldened; how possible is it? Can you explain how the connection would look like?

Exactly. In my situation, I drained the electrolytes to the recommended level as they were filled to the brim by Luminous staff.

Most flooded batteries do suffer sulphation (also spelt as sulfation) because they've been in store for long period. Hence, they need equalization or "high voltage" charging immediately they are purchased. I did 6 hours of charging at 29.6v after draining the electrolyte to recommended level, and everything has been performing well.

But I reverted to 28.8v afterwards. It seems our gurus are advising 29.6v as normal charge now.

viperVIP:
SOMEBODY HELP!!!

Is there anyone here who has used or install Eastman Tubular Batteries?
I bought one 2 weeks ago and this is my experience.

After being fully charged, battery drains from 12.9v to 12.2 in just 10 minutes with less than 200watts load on it.
Then from 12.2, it now drains normally till 11.0 which might last for 5+ hours with same load before inverter will alarm for low battery but I always switch it off when it's 11.6v

After lodging the complain to the seller, i was requested to bring the battery to their service centre, I did and It was delayed for 7 days leaving me stranded 'cos i sold the previous battery off as scrap same day i bought this. I got the battery back 3pm this afternoon and upon installing, same thing happened again.

I called their chief engineer to complain and here is his response.

"Check the backup time how many hours is going, Forget please battery voltage, Check the battery backup time"

which I responded with "Really? Since when has voltage become irrelevant in batteries?, because it will be foolish to keep discharging a battery to 10.5v as told by this so called chief engineer"

So before I take this further, I need to hear from others if they have experienced a thing as this.
mind you i'm using a Genus 875va inverter and the inverter is working fine, even the previous battery i replaced didn't jump voltage till it died.
Thank you.

The battery is suffering from sulphation as stated up there.

Get an inverter/charger that you can set the voltage....set it at 14.8v to charge for 6 hours or more. This will help "boil" the electrolytes and remove the sulphates on the plates. You can then keep charging at 14.4v or as advised by battery manufacturer.

Sulphation causes battery not to charge properly and the battery cannot withstand loads when battery is not charging. Hence, you will observe sudden drop in voltage when there's light out or PV is off.

Abdomox:


Exactly. In my situation, I drained the electrolytes to the recommended level as they were filled to the brim by Luminous staff.

Most flooded batteries do suffer sulphation (also spelt as sulfation) because they've been in store for long period. Hence, they need equalization or "high voltage" charging immediately they are purchased. I did 6 hours of charging at 29.6v after draining the electrolyte to recommended level, and everything has been performing well.

But I reverted to 28.8v afterwards. It seems our gurus are advising 29.6v as normal charge now.

Interesting revelation! Thanks bro.

CC: viperVIP

mctfopt:


Does it have balance current in the range of 1A to 2A? If yes, how much?

yet to confirm the balance current

Penuelseun:
State the appliances you want to power and for how long do you want them to run individually. That will help in giving you an estimate

light points, 2 tvs(75 and 32 inches ), freezer, 5 standing fans, 2 AC(1 hp), pumping machine. 8 to 10 hours outside sunshine. Hope this will help.

Cc: ojeysky.

JUO:
yet to confirm the balance current

Ok

a4cube:
light points, 2 tvs(75 and 32 inches ), freezer, 5 standing fans, 2 AC(1 hp), pumping machine. 8 to 10 hours outside sunshine. Hope this will help.

Cc: ojeysky.

I earlier gave you an example with 300w, you have to leave the 2 I have highlighted above out of it. However if you must use them. A. Typical non inverter AC will do 1000w and freezer maybe 200w. That's 2200 so just multiply earlier quotation in 7 folds.

NiyiOmoIyunade:

This method presupposes a standard installation with DB and breakers dedicated for inverter loads, if all the load wires were twisted together at the inverter output, you simply have to unbundle all and bring them back together one at a time.

I burst out laughing upon seeing this. My second solar RE installation had all loads twisted together at the inverter output. I was horrified to discover everything else was bundled together at the DB, bypassing the MCBs. Crazy stuff.

These days, it's a norm to see such from a previous "oga, I can do it for much less" installation.

WE BUY DEAD/SCRAP BATTERIES!!!

We also buy off scrap/dead deep cycle batteries from any state to Lagos(T&C applies) .

12v 200a ..... N15,000
12v 150a.......N11,000
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If outside Lagos state , send the scrap batteries to your nearby Lagos park & get your payment alert immediately after confirmatory remarks from me with the transport company manager / secretary or driver .

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DADAL:


The controllers wouldn’t cost you an arm and leg. If you’re on the market for a controller, make me an offer.

95k for the battery, if you are buying more than one (and I will add a Victron balancer for free). The batteries had only been cycled 13 times (never gone below 70%), and they’re as good as new.

To have done 28kAH it's likely it will be more than 13 cycles in practice. You may need to check settings on your victron, though it may no longer be necessary as you've moved to LFP, also I guess you meant never gone below 70% DOD.
Happy sales!

Any MPP GK user in the house that has the capacity to check actual load on battery (not via the MPP interface) should kindly quote me.

Anyone in the house with 280AH LFP cells for sale should kindly quote

This has to be wrong info. Electric shock on battery terminal suggest that the inverter has an issue already. In my experience, earthing will take away those kinds of leakage current rather than allow it shock you.

dejidotun2000:
You got a shock when you touched the positive battery terminal.

It wasn't because the inverter was not grounded. If anything, you will get a shock while touching the positive terminal because it is grounded !

Grounding prevents you from getting shocked only if you touch the metal casing.

It's possible that the AC output of the inverter is somehow coupled with the DC input possibly through the transformer.

ojeysky:
BMV 712 with 500A shunt, aux cable, long comms cable, temp sensor - 125k

12.8v 280AH LFP pack with 40A utility charger - 350k

Bus bars, 7s to 16s ANT BMS, 4s smart BMS, balancers(4s, 8s, 16s)

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Still available

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100ah 12v

earthrealm:


Ahh, bros
Congrats... I think say by now you go don become guru for this stuff

The 2 ends with pointing arrow should go to yyour CC.

Honestly this was the pic I had in my head.
... Me and electricity na cat and dog, I don't have the balls