LIFEPO4 Battery discussion thread

denmendez65 said:
I still have never seen anyone talking about doing equalising on GELs. That’s a flooded thing and it’s actually for removing the crystals off the plates. Not balancing if I recall correctly.
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better to just get the 2V tubular cells then instead of the 12V packs. Will probably cost a **** load though, prob 3 or 4 times more than LFP:
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wingnut771 said:
its an any battery thing. cells in series need balancing. 12V battery has 6 cells in series. A series string adopts the characteristics of the weakest cell, just like solar panels etc. Then you land up with no roof tiles.
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Hmmm, the only requirement I ever saw was you must float at least once a week. 72 hours is overkill.

Mine float on average of 4 hours a day, summer more like 6 hours. That’s plenty.

Look at car batteries. They last years and don’t need 72 hours to float. My bike battery is 6 years old now and still working fine
 
denmendez65 said:
Hmmm, the only requirement I ever saw was you must float at least once a week. 72 hours is overkill.

Mine float on average of 4 hours a day, summer more like 6 hours. That’s plenty.

Look at car batteries. They last years and don’t need 72 hours to float. My bike battery is 6 years old now and still working fine
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Agree. It did say 48-72 hours. Maybe once a month do 2 days on a weekend now that you have the other battery.
 
denmendez65 said:
Hmmm, the only requirement I ever saw was you must float at least once a week. 72 hours is overkill.

Mine float on average of 4 hours a day, summer more like 6 hours. That’s plenty.

Look at car batteries. They last years and don’t need 72 hours to float. My bike battery is 6 years old now and still working fine
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Car batteries charge at bulk all the time and never float and are not gels so they dont use the low and slow method.
 
wingnut771 said:
IMG_1627.jpegbetter to just get the 2V tubular cells then instead of the 12V packs. Will probably cost a **** load though, prob 3 or 4 times more than LFP:
View attachment 1912214
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Definitely would be darn expensive.

This would suffice for anyone wanting to get LA for whatever reason.

From what I researched long ago the batteries after the 3000 to 4000 cycles can be sent in for refurbishment indefinitely.

They replace the plates and you are good to go again. There is not real end of life for them.
 
wingnut771 said:
Car batteries charge at bulk all the time and never float and are not gels so they dont use the low and slow method.
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AGM and GEL are close enough. GEL just lasts longer if I remember well and has more cycles.

I think AGM has higher CCA than GEL and that’s why they use them in cars
 
denmendez65 said:
AGM and GEL are close enough. GEL just lasts longer if I remember well and has more cycles.

I think AGM has higher CCA than GEL and that’s why they use them in cars
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AGM (Absorbed glass matt) is not the same as gel. Gel refers to the electrolyte, AGM refers to the plates. You can get gel&agm in one afaik. My car has AGM for its stop start as it charges quickly. Gel and deep cycle dont like big current.
 
denmendez65 said:
Definitely would be darn expensive.

This would suffice for anyone wanting to get LA for whatever reason.

From what I researched long ago the batteries after the 3000 to 4000 cycles can be sent in for refurbishment indefinitely.

They replace the plates and you are good to go again. There is not real end of life for them.
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It would be even more expensive if you wanted to get that 12kW inverter. Wont you need 1250Ah if you wanted to discharge at 0.2C?
 
denmendez65 said:
AGM and GEL are close enough. GEL just lasts longer if I remember well and has more cycles.

I think AGM has higher CCA than GEL and that’s why they use them in cars
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Its coming back to me now. We covered this extensively in the mecer thread back in the day lol.
 
wingnut771 said:
It would be even more expensive if you wanted to get that 12kW inverter. Wont you need 1250Ah if you wanted to discharge at 0.2C?
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Nah only getting a 5kW to replace the 3.6 when it dies. Like the 2 inverter setup.
 
denmendez65 said:
Nah only getting a 5kW to replace the 3.6 when it dies. Like the 2 inverter setup.
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Also I’m just talking a lot of nonsense.

I would go LFP coz whenever I come back to SA I will get an EV bike and Car.

A 50km commute in an EV car is about 5kWh if I recall correctly. Will just have maybe 16kWh connected to the one inverter and the Omnivolt a max of 10kWh.

Drive around for free.
 
Wonder why the design life is only 5 years. Same as the warranty. Seems a bit lowish. 3000 cycles also but as we have seen cycles doesn't really matter.

R8500 isn't bad. Comes in at R500 cheaper than the omnivolt 15kW battery if you parallel 3 x Sunnew.

Even works out cheaper than a bunch of the Temu cheapig batteries.
 

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cavedog said:
Wonder why the design life is only 5 years. Same as the warranty. Seems a bit lowish. 3000 cycles also but as we have seen cycles doesn't really matter.

R8500 isn't bad. Comes in at R500 cheaper than the omnivolt 15kW battery if you parallel 3 x Sunnew.

Even works out cheaper than a bunch of the Temu cheapig batteries.
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Probably secondlife cells.
 
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