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Frequently Asked Questions
Battery Storage
A battery System that you own is the answer to greater grid independence, reduced electrical costs and in the event of a power cut the energy storage system will restore critical loads to the home.
With home battery systems that you use your solar PV system to charge, there are two ways to answer this question.
The amount of time that the solar battery can run your home for will depend on the capacity of the battery system and the level of charge. Some home batteries, like the Tesla Powerwall 2, could potentially power your home for more than 24 hours from a full charge, because the capacity of the battery is more than the average daily household usage of electricity. However, if it is only partially charged, or if you have a battery system with less capacity, the energy won’t last as long when powering your home.
In terms of the life span of a home battery system, this can vary; depending on the make and model of your battery and the way that you use it. Whilst these types of batteries are designed and optimised to undergo frequent charging and discharging, eventually, over many thousand cycles, the batteries will start to lose a small percentage of capacity. Professionally installed home battery systems will always come with a warranty, which are usually around 10 years, and are guaranteed to maintain a certain level of performance e.g. the Tesla Powerwall 2 has a warranty for 10 years for 80% of the original capacity; so, if your battery isn’t storing at least 80% of the energy it did when new within 10 years, Tesla will replace it.
From our own experience of these products and the very slow degradation of the types of batteries used in the home battery systems, the likelihood is that a home battery system will usually significantly outlast the warranty. It is the same as any other electronic product in this respect – if you bought a TV with a 5 year warranty, you would reasonably expect it to last for 10+ years.
Different home battery storage systems may come either ‘AC coupled’ of ‘DC coupled’. A DC coupled battery system, locates the battery between your panels and the inverter (which converts DC electricity to AC electricity for use in the home. DC coupled systems are more thermodynamically efficient, as you only convert DC to AC electricity once.
An AC coupled battery system has a separate inverter in the battery itself. Solar DC electricity is converted to AC electricity for use in the home, and if it goes into the battery is converted to DC again. This is thermodynamically less efficient, but much more flexible. It allows batteries to be charged from any source, not just solar. They can be charged from the grid, for example when electricity is cheap, typically when there is a lot of wind power on the national grid. So it allows you to take advantage of cheap low carbon electricity no matter where it is generated.
It also means that the battery doesn’t need to be installed physically close to your solar PV inverter, which makes installation more flexible. For these reasons, the market is moving towards AC coupled systems as standard.
Regardless of whether you choose a DC or AC coupled battery storage system, it should be possible to install it with an existing solar PV system.
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