20 APRIL 2022

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Batteries for solar panels: operation and typology

Batteries for solar panels

Batteries for solar panels are one of the most important elements that we can find when carrying out an isolated photovoltaic solar installation. Thanks to these devices we can accumulate the energy produced by the solar panels to be able to use it at times when the panels are not in operation.

With the help of these elements, energy independence is achieved as they offer us the possibility of being able to disconnect completely from the electrical grid, without paying any extra cost.

Batteries have the function of supplying electrical energy to the system when the photovoltaic panels do not generate the necessary electricity, for example, at night.  They are made up of a positive and a negative pole, as well as electrolytes which are the ones that emit the flow of electric current to the outside of the battery. It is based on a reduction-oxygenation process through which the electricity generated is stored.

Depending on the materials with which they are manufactured, we can find different types of batteries for solar panels:

 

Monobloc batteries:

This is the most common, recommended and, in addition, the most economical model. These are high performance batteries intended for small installations such as lighting in caravans, household appliances or small storage sheds.

This type of batteries can have 3 or 6 internal cells of 2V each, connected together forming a single block of 6V and 12V, made of lead and electrolyte.

Depending on the needs, there are several types of monobloc batteries:

  • Gel monobloc batteries > +1100 charge cycles.
  • AGM monobloc batteries > +500 charge cycles
  • Open lead-acid monobloc batteries > +350 charge cycles

 

Stationary batteries:

These batteries are more recommended for regular use in permanent solar installations and have a useful life of about 20 years.

Depending on the storage capacities and durability we can find two different types of stationary batteries: stationary open lead acid batteries and stationary gel batteries.  Both are recommended for use in homes, farms or everyday installations.

 

Lithium batteries:

Their presence is becoming more and more common since they offer high durability and need little maintenance, due to their greater depth of charge and discharge, they are the most profitable in the long term, as well as the smallest in terms of dimensions.

This type of battery offers integrated intelligent management and lasts 6500 charge cycles, unlike conventional batteries. They are classified according to their voltage and we differentiate between: High Voltage (HV) and Low Voltage (LV).

Choosing one type of solar battery or another depends on the use and operation that we are going to give: installation of a detached house, solar pumping installation, vans ….

As for prices, as a guide we can say that monobloc batteries are the cheapest, unlike lithium batteries that can cost twice as much and finally the stationary batteries that have an intermediate price.

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