
Curso de Energía Solar
ULTIMOS VIDEOS
Parkimetro Solar


Solar Battery Basics



Battery storage is a hot topic right now,
so brush up on these common terms.






Battery Capacity
Think of a battery as a bucket that holds energy for later use.
As such, “battery capacity” defines the size, usually in amphours
(Ah) but sometimes watthours (Wh), of our bucket.
For example, a 200 Ah, 12volt battery has twice the storage capacity as a 100 Ah, 12 V battery. We can calculate the energy
storage in each battery by using the equation: volts x amphours
= watthours. The 200 Ah battery can store 2,400 Wh,
while the 100 Ah battery has 1,200 Wh of energy storage.
Depth of Discharge
Depth of discharge (DOD) describes the percentage of battery
capacity that has been used. For example, if we discharge our
2,400 Wh battery by 20% (20% DOD), then practically, we
have pulled 480 Wh from that battery.
State of Charge
Conversely, state of charge (SOC) describes the percentage of
battery capacity remaining. So our 2,400 Wh battery that has
been discharged 20% is now at an 80% SOC, and still has 1,920
Wh of energy stored.







This maintenancefree
Trojan L16
AGM battery offers
370 Ah of storage
at 6 volts. 








Charge & Discharge Rate
Charge & discharge rate is the speed at which you charge (or discharge) a battery, stated in terms of capacity over
time. For example, if you have a 200 Ah battery, and you
are charging it at 10 A, your charge rate is C/20 (200 Ah÷ 20 hrs = 10 A). Conversely, if you discharge the battery at a
rate of 2 A, then your discharge rate is C/100 (200 Ah ÷ 100
hrs = 2 A).
Battery capacity is also dependent on the speed at which you
discharge it, and batteries will actually offer a slightly higher
capacity if discharged more slowly. For example, one type of 12
V battery has a 200 Ah specification if discharged over 20 hours
(C/20), but offers 212 Ah if discharged over 100 hours. Home PV
system batteries most often use the 20hour rate since it closely
relates to the 24hour cycle common in those systems.
Cycle Life
Cycle life is the number of charge/discharge cycles a battery
can complete during its “operational life,” which is commonly
defined as ending when it has dropped below 80% of its
original capacity. Cycle life is dependent on how deeply the
battery is discharged—battery manufacturers provide cyclelife
graphs showing this relationship. For example, a leadacid
battery may provide 1,000 cycles if DOD is limited to 50%
each time, but only 500 cycles if it is discharged by 80%. You
can get by with a smaller battery bank and less initial cost by
discharging it more deeply, but you will have the hassle of
replacing the batteries more frequently.



Productos Solares
Ver Blog
Noticias:
PALABRAS CLAVES
.
@ Contactenos 
