What is electricity self-consumption

Factors to take into account to correctly size a photovoltaic installation

To carry out a photovoltaic solar installation that suits our needs without having to obtain a bad result, we must follow the following premises:

With what working voltage will the installation work?

  1. For very small consumption suchas: light bulbs, television, alarms, small pressure pump… We will choose a 12V installation.
  2. For small or medium consumption suchas: refrigerator, washing machine, sewage pump, microwave… We will choose a 24V installation.
  3. For medium and high consumption suchas: refrigerator, washing machine, sewage pump, microwave, dishwasher, oven, ceramic hob, electric water heater… We will choose a 48V installation.

At AutoSolar we have solar kits that work at 12V, 24V or 48V depending on our daily energy requirements. AutoSolar solar kits have in their description a list of estimated electrical devices that the system can supply, depending on whether it is a 12V, 24V or 48V installation.

 

The electronic equipment of an isolated solar installation is the following:

– Charge regulator : It is responsible for regulating the energy from the solar panels in order to charge the connected batteries properly.

– Inverter : It is responsible for transforming the direct current of the battery (12V, 24V, 48V) into alternating current (230V) to be able to feed the consumption of the home or country house.

– Battery Charger : It is responsible for charging the batteries through the electrical network or a generator set when they are low on charge.

This equipment that we have just described can be purchased separately, or in the same equipment that performs the 3 functions with which we will reduce the final costs of the installation.

The 3-in-1 inverters are capable of : regulating the load, converting from direct current to alternating current and charging the batteries through a generator set or the electrical network, they are reliable and highly commercialized equipment with which we unify our installation in a make it simpler and easier to maintain. The 3 in 1 inverters have a single casing, easy to install with which we will reduce wiring and therefore associated losses. In addition, they are usually programmable inverters, and have a digital display with which all their functions can be controlled, so that we can instantly know what the photovoltaic production is or the charge that remains stored in the battery bank.

choose solar panels

Solar panels are divided into 3 types that differ at first glance by the number of cells they have:

– 12V solar panels : They are the ones with 36 cells. Its output voltage is usually around 18V and its use will be adequate in PWM type regulators connected in parallel to a 12V battery.

– 24V solar panels : They are the ones with 72 cells. Its output voltage is usually around 36V and its use will be adequate in PWM-type regulators connected in parallel to power a 24V battery bank or MPPT-type regulators for a 12V battery.

– Grid connection panels : They are the ones with 60 cells: Their output voltage is usually around 30V and they should always be used with MPPT solar controllers.

Depending on the type of panels selected, we will choose an individual PWM or MPPT regulator or a 3-in-1 inverter that has the most suitable regulator. We recommend this last option to reduce spending as much as possible.

Choosing solar batteries

Choosing the right battery bank is crucial for the solar system to function properly throughout the year . It must be foreseen if there are going to be higher consumptions in the future, since it is not at all advisable to expand the battery bank by making subsequent connections in parallel.

Depending on the type of installation and use that is given to it, we will use one type of battery or another:

– Monoblock batteries: they are batteries normally with a truck-type format (although we can also find them narrower and taller), which have a useful life of about 5 years and fulfill their function in small 12V installations for weekend use. They are also suitable for regular use, taking into account that a generator set will be used more frequently, since they are usually batteries with capacities of up to 300Ah.

– 6V stationary batteries: they are batteries with a high format that we must connect in series until reaching the appropriate voltage. Their useful life is estimated at about 10 years, and they are suitable for both 12V, 24V or 48V installations for regular use. These types of batteries usually have maximum capacities that reach 500Ah, so at 24V or 48V voltage it allows us to enjoy a photovoltaic installation to power a home with the usual electrical appliances.

– 2V stationary batteries: These are batteries with a narrow and tall format that we will connect in series until the desired voltage is reached. Their useful life is estimated at 15 years, and they are suitable for both 12V, 24V or 48V installations for regular use. In this type of battery we can find

capacities from 300Ah to even 5000Ah for industrial use, so at 24V or 48V voltage we will have a high-performance photovoltaic installation to supply the desired electrical consumption.

Perform the installation and program the equipment

At AutoSolar we have explanatory videos on our YouTube channel to make any connection to the solar kit . In addition, together with your order, we will attach a single-line diagram in order to respect the polarity and connect all the equipment correctly.

The programming of the equipment is simple and is explained in the manuals that are attached to them, even so you can always contact us by phone or email and ask us any questions that may arise during the process, or questions about any other aspect regarding to the purchased system.

conclusion

To make the installation economical but at the same time reliable and durable:

– Buy 3-in-1 inverters as they are the best option to reduce installation costs, as explained in the device selection section.

– Buy solar panels with the correct voltage as indicated in section 3, together with the appropriate solar regulator.

– Buy the appropriate batteries depending on the type of use that we are going to have , monoblock batteries are not recommended in solar kits for permanent housing.

 

 

 

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