Being able to quantify the difference between battery technologies is essential in understanding why one is better than another. For comparison purposes all batteries will be rated at 12V100Ah.
|Flooded Lead Acid||Sealed Gel lead acid||Lithium-Ion||Lithium-Polymer||Lithium Iron Phosphate|
|Depth of Discharge||50%||50%||80%||80%||80%|
|Available Ah||50 Ah||50 Ah||80 Ah||80 Ah||80 Ah|
|C rating||0.2C(20 amp)||0.2C(20 amp)||0.4 C(40 amp)||0.4C(40 amp)||1C(100 amp)|
|Voltage||13-10V(11V avg)||13-10V(11V avg)||12.6V||12.6V||12.6V|
|Usable Ah/cycle||12.5 Ah||20 Ah||76 Ah||76 Ah||78 Ah|
|Power density/cycle||137.5 Wh||220 Wh||957.6 Wh||957.6 Wh||982.8 Wh|
|Total Power density||41 kWh||220 kWh||1,915 kWh||1,915 kWh||2,948 kWh|
V- Volts: The speed of energy transfer
A- Amps: The amount of energy transferred at a given voltage
Ah – Amp Hour: The amount of energy transferred at a given voltage over period of one hour
W- Watt: Total volume of power transferred calculated as V x A = W
Wh – Watt hour: Total volume of power transferred over a period of one hour
kWh – kilowatt hour: Total volume of power transferred over a period of one hour calculated as Wh/1000 (equal to 1000 Wh)
Rated Ah- The number of Ah in one cycle as rated by the manufacturer
Depth of discharge- The percentage of one cycle available to preserve the long-term life of the battery.
Available Ah- The amount of Ah available in one cycle calculated as Rated Ah x Depth of discharge
C Rating- The rated output of the battery based on the rated Ah of the battery calculated as C x Rated Ah. (1C x 100Ah= 100 Amp output) The C rating listed is what the manufacturer to preserve long-term life. This does not represent the capability of the battery.
Battery efficiency- The ability for the battery to transfer energy in and out of the battery listed as a percentage. (50% efficiency means that the battery can charge/discharge 50% of the total energy)
Usable Ah/cycle- Available Ah x battery efficiency
Power density/cycle- Avg voltage x usable Ah/cycle = Wh/cycle
Rated Cycles- The total charge/discharge cycles rated by the manufacture at a given depth of discharge and C rating
Total Power density- Power density/cycle x Rated cycles