This is why lead acid performs well in a starter application with brief 300A cranking loads and plenty of time to recharge in between. Secondly pulling voltage down to less than 50% remaining capacity permanently devalues the battery. Peukert’s law expresses mathematically that as the rate of discharge increases, the available capacity of that battery decreases. The charge time depends on the battery …
Figure 1 shows the modeled discharge profile for a 600 Ah cell loaded with varying power. Charge Formulas; Example: Battery AH X Battery Volt ÷ Applied load.. The lead acid battery prefers intermittent loads to a continuous heavy discharge. The two main battery chemistries for off-grid are Lead Acid (flooded or sealed) and Lithium. This article contains online calculators which can calculate discharge times for specified discharge current using battery capacity, the capacity rating (i.e. The calculation of the characteristic diagram is essential for discharging. Without making you read the tutorial referenced above, some batteries have a big change in capacity based on how fast you discharge them. 20 hour rating, 100 hour rating etc) and Peukert's exponent.
The rest periods allow the battery to recompose the chemical reaction and prevent exhaustion.
These two chemistries have unique characteristics.
It is called Peukert’s Law.
The higher the discharge current, the greater the voltage drop. Last example, a lead acid battery with a C10 (or C/10) rated capacity of 3000 Ah should be charge or discharge in 10 hours with a current charge or discharge of 300 A. Lithium batteries are more efficient, which means less power is wasted in the charge/discharge process.
Luckily for us, there is a very handy-dandy formula to figure out exactly how long a lead acid battery will last, under any load. Not so good for alkaline, carbon zinc, lead acid, lithium thionyl chloride, and coin cells.
The Ah rating is normally marked on the battery. This calculator is intended to help you figure out how long your lead-acid (Wet, AGM, Gel) battery will last under a specified load.In order to use this calculator you will need two separate AH ratings, given by the manufacturer, as well as the amperage, in direct current of your load.
This calculator gives a good estimate for Lithium Ion, Lithium Polymer, NiCad, and NiMH batteries. So, for a 110Ah battery with a load that draws 20A you have: # 110÷20 =5.5 hours. So between 50F and 80F could have a 10% difference in charge state. Do remember that battery voltage readings are temperature dependent. Online calculator. Discharge Formulas; Discharge time is basically the Ah rating divided by the current. Why is it important to know the C-rate or C-rating of a battery For really serious work advisable to take temperature of the battery acid for standard lead acid batteries. They also have a greater discharge depth allowing you to fully utilize all of your battery capacity. Lead-acid batteries show a characteristic with continuously decreasing voltage when discharged with constant current.
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