A battery for solar panels ensures that you can store and use the generated electricity whenever you want. What comes to look at backup battery? A storage cell stores the power for later. It gives you freedom, and you are no longer dependent on the energy companies and government.
Choose the best battery for a solar energy system.
A battery for the home (or office etc.) is not new at all, but in homes and buildings, you do not see it that much. But in boats and campers, it is very typical. The storage facility for house solutions is beautiful because you become more independent of energy suppliers and can store the electricity of photovoltaic panels for later.
The generated energy can be used directly, stored in batteries for later use or fed back to the grid. You are free and no longer dependent on the grid arrangement. A grid-connected solar power system with storage cells usually has a control station between the panels, the electrical equipment and the home battery. It is called a hybrid grid inverter.
The advantages are:
- You have pv modules on your roof that generate kWh and a battery/accumulator to store that kWh.
- The PV panel controller sends the generated power to the devices that currently need power. But if you do not need anything at that moment, the DC power goes to the cell. That electricity is used later when extra power is needed.
- Only when the storage is full, the power will be returned to the electricity grid.
- When no power / kWh is produced, but there is demand from the household, the power gets pulled out of your battery pack.
Choose the best battery for a solar energy system.
Fortunately, the battery has another advantage that most people overlook. An empty DC cell can if the sun does not shine, possibly be charged with cheap off-peak electricity, to be used later, at higher rates. This difference in tariff is still small (less than a cent per kWh) but may become more substantial in the future if more wind and sun are supplied to the electricity grid to make the network smarter (the so-called ‘smart grid’).
The generated kWh electricity that you do not use will be stored and used when you need it. That is why we are now looking at how such a storage facility works exactly, what choice in brands and models you have and of course what the costs are.
Solar battery technology
There are already many people who have been storing the electricity of PV modules for a long time for later. Think of owners of campers who have a solar panel on the roof, boat owners who want to be able to stay anywhere and many sheds that have a small photovoltaic module and a little battery to be self-supporting even without NUTS facilities and that is beautiful? You often still need a connection.
Solar panels battery 220v
A connection of 220V / 230V remains unfortunately also with a home battery almost always inevitable. This is due to the large seasonal differences in the generation of kWh. With a storage cell, you can store electricity for a few days; your abundant summer stream for the dark winter is not possible because it is too far away.
Solar panels on storage facility or the grid
If you look at that as a household, you can generate enough energy with solar panels and keep it on to run your entire house and also drive all your miles a year in an electric car. That way you are 100% independent of the network and over a period of time you have earned back your investment.
Calculation battery capacity solar Modules
You may already have calculated how much Watt-hour a day is going to need. This is An average household consumed about 3,300 kWh in the Netherlands in 2010, which is 3,300,000 Wh per year and therefore 9,000 Wh per day for a whole family. If you assume a smaller need in a calculation example for, for example, 1 person who lives economically, we arrive at the following calculation example:
For example, we take 1028 Watt-hours per day. With this, you want to know what type of battery that can store this capacity at least. The size of a cell is described in the number of Ah. (this is Ampere hour). The number of ampere-hours is the amount of power that a battery can deliver for an hour.
Storage facility capacity
To convert the number of watt-hours to the number of ampere-hours of the cell, the voltage of the battery is essential. The voltage of cells is generally 12V (12 Volt), and the conversion is as follows:
The number of Watt-hour / 12V (voltage of the accu) = number of ampere hours.
We continue with the example:
So with this, we can determine what the right cell capacity should be. There is namely: 1028wh / 12V = 86 amperes hours.
It is wise to take a battery with a capacity that is at least twice as high. This way you will never be without power.
So if you take 2 times that capacity, you get: 86 x 2 = 172 Ah.
Conclusion calculation: You need a storage facility of 12V, 172 Ah for a requirement of 1028 Watts
What kind of battery to choose?
With a completely independent solar panel installation, a lithium battery is an essential part of the whole. All power that is not immediately consumed will be stored in the batteries. With an average capacity, there will always be multiple batteries connected in series. Otherwise, you would need 1 large storage facility.
Storage facility maintenance
The maintenance of this system is something to be reckoned with. An independent PV system is significantly more maintenance-sensitive than a grid-connected one. The solar batteries must be checked and maintained every 6 months. The cells must be cleaned of dust and cleaned to prevent short circuits.
Personally, I believe very much in the system of storing energy myself. You can not only connect everything in your shed that has no electricity connection but also in your own home or business. Through the batteries connected to the solar panels, you have everything you want, without the energy supplier.