As far as efficiency and reliability are
concerned, nothing can beat Lithium-ion batteries. However, for off-grid storage systems,
the lead-acid battery can be a better choice for a number of reasons.
Basically, both types of storage units can store energy in an effective manner,
but both have their own set of advantages and disadvantages. Given below are
some points of comparison between the two. Read on to know more.
Cost
Cost is one of the main factors that
draw a line between the two. If you get two batteries of the same capacity, the
Lithium-ion battery will cost you three times more. Based
on the size of the system you want to install, this can increase your
expenditure significantly.
Although the lead-acid batteries have
relatively lower price tags, they cannot last as long as their counterpart.
Capacity
The capacity of a battery pack refers to
the amount of energy it can store. The great thing about these batteries are
that they have a higher energy density than their counterpart. Therefore, these
units can store more energy without occupying additional space. So, you can
install more of these units in less space.
Depth of Discharge
The depth of discharge of a battery is
the percentage of the power that can be drained without causing any damage to
the unit. The disadvantage of lead-acid batteries is that they cannot be
drained by more than 50%. On the other hand, Li-ion batteries can be safely
drained up to 85% of their capacity.
Efficiency
Another good comparison point is the
efficiency of these units. Unlike lead-acid batteries, lithium-ion batteries
offer 95% more efficiency. In other words, 95% of the power stored in these
units can be used. On the other side, the other type of battery offers only 85%
efficiency.
Lifespan
Just like solar panels, batteries
continue to degrade with the passage of time. As a result, they lose their
efficiency. After recharging a battery, when you discharge it completely, it is
considered one discharge cycle. As far as the number of discharge cycles is
concerned, lead-acid batteries cannot beat Lithium-ion batteries. Therefore,
the latter offers a much longer lifespan.
Should you Install a Lead-Acid Battery
or a Lithium-Ion Battery?
If you need to install a backup system,
you can go for either a lithium-ion battery or a lead-acid battery. However, since
the former offers a lot of advantages, you may not want to go for Lead-acid
battery packs. Although lithium-ion units have a higher cost, they offer a
great return on investment for many reasons explained above.
However, if you don't want to use your
battery packs quite often, your ideal choice may be lead-acid batteries.
It was a brief comparison between Lithium-ion batteries and lead-acid batteries. Hopefully,
this comparison will make it easier for you to make the right choice.
Therefore, if you can afford it, you can spend more money and install
lithium-ion battery systems.
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