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Installation & User Guide
SL Range
3
Longevity & Depth of Discharge
One of the advantages of lithium batteries over lead-acid batteries is longevity. If you want to realise
the long life potential out of your lithium battery, then consideration must be given to depth of
discharge.
A battery lifespan is rated by the number of cycles before the original capacity has reduced by a certain
amount.
A cycle is defined as discharging from fully charged, to a percentage Depth of Discharge (DoD), and
then charging back to full again. So, DoD describes what percentage of the battery capacity is being
used each time.
NOTE - DoD is different to State of Charge (SoC, also known as Charge Level); in fact, they add together
to 100%. So, 80% DoD equates to 20% SoC.
The less DoD you use each cycle, the longer the battery will last.
This fact should be considered when choosing the battery Amp hour capacity. You will have a higher
return on battery investment if there is enough capacity at hand such that you are not heavily
discharging the battery on every cycle. A capacity 'overhead' ensures lower DoD, extended life and
therefore a higher financial return on your investment.
LBS Lithium Iron Phosphate (LFP) batteries have a cycle life of 5,000 cycles at 50% DoD and 2,000
cycles at 80% DoD.
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Slimline User Guide v9
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