There are a lot of firms wanting to sell storage batteries/inverters in order to enable solar power generated during the day to be used after dark in the evenings.
A simple look at this makes me think that this will never be financially beneficial.
Lets assume you already have say 6 kW of solar PV panels fitted. If you have say 4 kWh of storage then if this is fully charged during the day AND you use all this charge every evening then you will save 30p per kWh totalling £1.20 per day. Or annually £438 ! In practice due to the difficulties of using the full capacity beneficially it might only be about £200 benefit every year.
But a typical cost seems to be about £1000 per kWh. so you spend £4000 to receive a benefit of just 5% or £200 !
Then there is the life of the batteries. Many only last for 500 to 1000 recharge cycles! So the batteries will need replacing every 2-3 years. That will reduce the benefit from 5% to about 2% to 3% !
So my conclusion is that no storage system is ever going to be financially beneficial.
Have I missed something or is this just another industry mis-information situation?
A simple look at this makes me think that this will never be financially beneficial.
Lets assume you already have say 6 kW of solar PV panels fitted. If you have say 4 kWh of storage then if this is fully charged during the day AND you use all this charge every evening then you will save 30p per kWh totalling £1.20 per day. Or annually £438 ! In practice due to the difficulties of using the full capacity beneficially it might only be about £200 benefit every year.
But a typical cost seems to be about £1000 per kWh. so you spend £4000 to receive a benefit of just 5% or £200 !
Then there is the life of the batteries. Many only last for 500 to 1000 recharge cycles! So the batteries will need replacing every 2-3 years. That will reduce the benefit from 5% to about 2% to 3% !
So my conclusion is that no storage system is ever going to be financially beneficial.
Have I missed something or is this just another industry mis-information situation?
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