Advice on changing batteries to LiFePo please

[Ditcha]

Let us know if you get caught for import tax & VAT.

Will you be checking the capacity before fitting as a lot of these cells are not always what they claim?

Rept Cells arrived today no import tax or vat really happy with them all checked out correct, but have not capacity tested yet.

 

[Lenny HB]

Just to make your day they have dropped another £100 in price.

 

[Jimbohorlicks]

Buying 4 cells for £676.80 is not a bad price as EVE are the in vogue cells at present.

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Am I correct in assuming that the lithium battery cells are 3.6 volts x 70 ah each making 3.6 v X 280ah for 4 cells in parallel or 12v X 70 ah for 4 cells in series.
To make up 12v X 280ah you would need 16 of the cells.
Or am I misreading something.

 

[Lenny HB]

Am I correct in assuming that the lithium battery cells are 3.6 volts x 70 ah each making 3.6 v X 280ah for 4 cells in parallel or 12v X 70 ah for 4 cells in series.
To make up 12v X 280ah you would need 16 of the cells.
Or am I misreading something.

Each cell has a nominal voltage of 3.2v with a capacity of 280ah so 4 cells in series will make a 12 v 280ah battery.

 

[Two on Tour]

Am I correct in assuming that the lithium battery cells are 3.6 volts x 70 ah each making 3.6 v X 280ah for 4 cells in parallel or 12v X 70 ah for 4 cells in series.
To make up 12v X 280ah you would need 16 of the cells.
Or am I misreading something.

No, each cell is a nominal 3.2v with a capacity of 280ah, so 4 in series will give you a battery pack that is a nominal 12.8v with a capacity of 280ah.

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[Two on Tour]

Each cell has a nominal voltage of 3.2v with a capacity of 280ah so 4 cells in series will make a 12 v 280ah battery.

I saw the quick change. , you got me questioning myself for a second there.

 

[Jimbohorlicks]

Thanks ,for that ,I didn't think that the size of each cell ,70 X 174 x204. or 4 together 280 x174 x204 was big enough dimensionally for 280 ah when compared to made up batteries,,but I suppose these also have the BMS ,heater pads and other wiring internally plus the case to make up the larger dimensions.

 

[Ditcha]

Just finished install all working as expected let's see how it preforms on the many rallies booked this year

 

[Jimbohorlicks]

Wow Dave, All looks nice and neat ,let us all see the big switch on.
Trust Dianne appreciates the hairdryer capability now. ?

 

[Ditcha]

Wow Dave, All looks nice and neat ,let us all see the big switch on.
Trust Dianne appreciates the hairdryer capability now. ?

Thanks Jim the hairdryer is for me

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[Jimbohorlicks]

Thanks Jim the hairdryer is for me

With all that wiring ,I'm surprised you haven't pulled it all out ( hair that is) .
It will be interesting to see the results when your all charged up and off grid.

 

[Lenny HB]

Come on we are all waiting for you to tune for maximum smoke.

I see you have used all Victron gear now this is a question probably for Raul, Hoovie & other Lithium experts.
Looking at the spec of the Victron IP22 charger I noticed on Lithium settings once it reaches the charged voltage it drops to a float charge of 13.5v volts, I always thought that with lithium once charged it's best to turn off the charger, so why do they do this?

 

[Lenny HB]

Ditcha What is the MCB switching as it looks like quite heavy cables and it looks like an ac rated MCB the dc rating will be way lower.

 

[Ditcha]

Ditcha What is the MCB switching as it looks like quite heavy cables and it looks like an ac rated MCB the dc rating will be way lower.

Lenny it just used as a isolator for the solar (switch on/off) it was the cheapest i could find on amazon

Should really be DC rated but it literally is only used as a on/off switch

 

[Raul]

Come on we are all waiting for you to tune for maximum smoke.

I see you have used all Victron gear now this is a question probably for Raul, Hoovie & other Lithium experts.
Looking at the spec of the Victron IP22 charger I noticed on Lithium settings once it reaches the charged voltage it drops to a float charge of 13.5v volts, I always thought that with lithium once charged it's best to turn off the charger, so why do they do this?

To sustain loads as long as the charger has juice, without eating into the battery.

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