Can someone explain to me how battery cycles are counted and calculated please?

 

Is it the cumulative charge and discharge from 100 to 0 and back to 100 as one cycle.

 

So one could use multiple cycles in a single day if using batteries during the day to supplement solar install and then at night to power the house?

 

Have just installed Sunsynk 5kw and 5.1 BSLBATT with 6 panels so want to make sure I understand how the charging cycle works so I get maximum benefit from using batteries but don't want to kill it in 3 or 4 years as I am charging a little and using a little during the day all the time and then only batteries at night.

 

Is it better to only use battery at night and if during the day the PV cannot supply the demand to rather use from the grid?

 

DOD set to use maximum 75% of battery power, stopping at 25%.

 

Many thanks for sharing your expertise.

Edited January 15, 20223 yr by Nicholas Baard

1 hour ago, Nicholas Baard said:

Can someone explain to me how battery cycles are counted and calculated please?

I don't know if this applies to all manufacturers, but my Pylons (US3000B batteries on firmware 2.8) use Equivalent Full Cycle as a cycle.  That mean that for a 74Ah battery like the US3000 the cycle count is incremented by one for every 74Ah of discharge.  Even when the battery capacity (SOH) decreases with age they still use the full original capacity as a cycle.

Edited January 15, 20223 yr by Calvin

Many thanks

 

Different manufacturers will calculate cycles differently. My LBSA battery has a strange way of calculating a cycle hence warranty is based on years not cycles 

My previous Pylontech US3000 calculated a cycle as full discharge and back up to full again as one cycle. For example I set the minimum SOC at 25% which was not always reached each day, and after a year it showed just over 200 cycles.

I recently had 3 Hubble AM-2's installed on 21 Dec 2021, and they are currently showing 57 cycles after 28 days and minimum SOC of 20%, which equates to two cycles a day, which doesn't make sense. I sent Hubble Support a mail and can advise later what they replied.

44 minutes ago, Analytical said:

My previous Pylontech US3000 calculated a cycle as full discharge and back up to full again as one cycle. For example I set the minimum SOC at 25% which was not always reached each day, and after a year it showed just over 200 cycles.

I recently had 3 Hubble AM-2's installed on 21 Dec 2021, and they are currently showing 57 cycles after 28 days and minimum SOC of 20%, which equates to two cycles a day, which doesn't make sense. I sent Hubble Support a mail and can advise later what they replied.

I have the same with LBSA it counts a cycle every time it goes over / under 80% SOC 

Would like to know how Hubble AM-2 does it's calculations as mine seem to be 1.3x higher than days in use.

Edited January 18, 20223 yr by system32

Would also like to know how the Hubble AM-2 does the cycle calculation...

My LBSA doing the same

Counting one cycle even if I only use 16%

 

1 hour ago, PietSkiet said:

My LBSA doing the same

Counting one cycle even if I only use 16%

 

@PietSkiet Just get used to it, LBSA uses SEPLOS BMS, they default setting count one cycle every time it drops below 80% DOD, what I've seen with my battery is that even if you do not use any power from the battery, the moment it starts to charge a bit as the sum comes up in the morning it counts one cycle. See my dashboard. week cycle count and 1 week DOD.

Another strange thing is some days even counts 2 cycles while it's charging the battery, on the 23rd my battery was at 95% dropped to 92% and when it started to charge again it counted one more cycle.

In my opinion LBSA should change that setting before they send the batteries to the market.