Battery Storage at SegenSolar
Solar power battery storage allows users to extend consumption of the electricity produced by solar panels and become less reliant on energy providers.
With a lithium ion energy storage system, you can get stand-alone batteries with an additional battery management system (BMS) from SegenSolar. The gross capacity starts at around 2kWh depending on the manufacturer and the model, and it can be scaled almost at will. Depending on how you plan to use it, you can start with a small battery storage unit and expand it in the future if needed.
The usable capacity, also called the net capacity, can be up to 90% of the gross capacity depending on the system.
The lifetime of a high quality lithium ion battery can be between 5000-7000 cycles which equates to around ten years of normal usage. The in-built battery management system ensures that the battery is always kept in optimal condition and intelligently controls the energy output.
A high quality lithium ion battery weighs between 10kg and 15kg per kWh of usable capacity. The battery storage systems in the SegenSolar portfolio are designed so that they can usually be installed by just one person.
Energy Consumption at Base Load
The main consideration for a PV system which is capable of providing back up power, in case of a power cut for example, is the load that must be borne in the absence of grid power. The best way to calculate what load the back up needs to support is by finding out the power consumption of the most commonly used electrical devices so that the storage size can be kept within a range that will be suitable for most households. Therefore, it makes sense to determine how high the corresponding base load of a household is and to combine this with the times when these devices are needed. In the event of a power cut, a battery storage system can absorb this base load and supply the most important devices with electricity. The following table shows an example household with various appliances, the power they use, the time they usually operate for in hours, a number showing how important that device is and the daily amount of electricity used in Wh. This can of course be adapted to the needs of individual consumers.
| Device | Power (W) | Time | Importance | Daily Consumption (Wh) |
| Light | 200 | 5 | 1 | 1.000 |
| Fridge | 150 | 24 | 0.3 | 1.080 |
| Freezer | 150 | 24 | 0.2 | 720 |
| Router | 10 | 24 | 1 | 240 |
| Telephone | 50 | 1 | 1 | 100 |
| TV | 170 | 4 | 1 | 680 |
| Other | 100 | 24 | 1 | 2.400 |
| Total | 6.970 |
Battery Operating Time
To know which battery you need for a back up system, it is important to consider how long the most critical devices would need to be supplied with power for. For example, if your country experiences power outages of 100 minutes a year on average, then the back up system should be designed so it can effortlessly cover the power load needed during this time.
Battery Charging Time
In simple terms, the battery is charged with the surplus energy generated by the solar system. This surplus energy is calculated by taking the difference between the amount of electricity generated by the solar system and how much electricity is used by the connected devices during the day. Therefore, it is important to design the solar system and the storage unit in such a way that it is possible to fully charge a battery throughout the day. This is particularly important during the winter months when the amount of electricity produced will be lower than in the summer. A battery pack that is too large in relation to the PV system won’t be fully charged and its full capacity won’t be available in case of a power outage.
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