Lithium-LiFePO4 what counts as one charging cycle?

Question

question

mojo asked Aug 22, '19

Lithium-LiFePO4 what counts as one charging cycle?

Question as above. Does any amount of charging count as one cycle?

IE if you charged from 60% to 90% would that count as one cycle?

Or is a cycle only counted when you fully charge the battery to 100%

For instance yesterday my 300ah 24 v bank was at 56% so I ran the genset which charged at @149amps

The skylla tg cut out when the battery voltage reached 28.4v the 24 /3000/ 70 Phoenix inverter carried on charging but at much lower rate

But the app only showed 63% and stayed there. so on my thinking that was time to synchronise to 100%.

And that counts as one cycle?

Sorry if this is stupid question but I’ve just had the Lithium-LiFePO4 fitted and I am anxious to get the charging regime right

battery charging Lithium Battery

1

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

thebarold commented · Oct 04, 2019 at 02:44 PM

I am curious about this as well. When I look at other LiFePo4 battery brand's stats, I see higher number of cycles. This is key to the economics of Lithium over SLA batteries. If the manufacturer backs up the cycle count with their warranty, then I'd be more inclined to make the investment in Lithium but right now this is just an assumption of something to take place over 5-7 years...

0 ·

Modifications Space

Node Red Space

Answer 1 · 2019-08-23T19:57:16Z

safiery answered · Aug 23, 2019 at 07:57 PM

On another brand of Lithium that we sell the cycle count is readable though Bluetooth. On that particular brand, one cycle is counted when the accumulated discharge reaches 100% over any chronological period. My 200Ah test battery is 7 months old with 8 cycles. For most RV users, their kids will inherit the Lithium battery before it reaches cycle life!

3

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

mojo commented · Aug 24, 2019 at 03:33 PM

Thanks for the reply safiery my batteries are victron, so I have the blue tooth app.

Looking at those numbers of charge cycles I feel I could take the batteries down to a much lower soc than 50% and still get many many years of life out of them. I’m a live aboard boater and I’ve only had the batteries a month now with an average daily use of 59ah out of a 300ah 24 v bank .

Does that makes sense to take them down to say 30% soc ?

0 ·

safiery mojo commented · Aug 24, 2019 at 07:25 PM

We need someone experienced with Victron Lithium to reply. The 5 year warranty on my other brand that I sell is for 6,000 cycles at 80% DOD . So I currently run them deep to 30-30%. That is what you are paying for with Lithium!

0 ·

Gary Pacey safiery commented · Aug 25, 2019 at 09:22 PM

I’m just curious as to how you measure (or the customer measures) the cycles on your battery referenced to the warranty cycles?

0 ·

question