Battery Storage for Solar PV

 

How it works

‘Energy storage’ lets you store the surplus solar electricity, instead of exporting it. Battery storage lets you use more of your solar PV system’s output (in the jargon, it ‘increases ‘self-consumption’). This reduces the amount of grid electricity you need to buy, saving you money on your electricity bill.

During the day

  • The solar PV system generates solar electricity
  • The battery storage system will check if all the generation is being used to power your lights and appliances
  • If you’re not using all the electricity that the solar PV system is generating, then the system will ensure that any surplus energy is used to charge the battery
  • Once the battery is fully charged, if there is still more solar electricity being generated, this will be exported to the grid (or in some systems, will be diverted to other uses e.g. to an immersion heater)

In the evening or at time of low solar generation

  • The solar PV panels have a reduced or zero output
  • The battery system can discharge the stored electricity, providing you with renewable-generated electricity at no additional cost
  • Once the battery is discharged, if you need to use more electricity, you buy it from your electricity supplier
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    Power-cut operation

    Despite expectations, some storage systems will not provide power during a power-cut. Some battery storage systems however do have an ‘off-grid’ functionality, providing a limited amount of power to your home, or to essential equipment (such as your fridge-freezer, lighting etc). But a battery may run out of power before the power cut ends – or have already run out of power if it’s been discharging all evening and the power outage starts late at night or early in the morning. If you require your battery storage system to provide power during power-cuts it is important to talk this through with your storage installer from the outset as the system will need to be carefully designed and set-up to your specific requirements.

    Does it affect my Feed In Tariff (FIT)?

    The generation FIT is paid for every kWh generated by your solar PV system, as measured by your solar generation meter. In addition, the scheme estimates (or ‘deems’) that half of this will be exported back to the grid and pays an export tariff on that ‘deemed’ 50%.

    Generation payment

    Your generation payment is unaffected in any way by the installation of your battery storage system. The solar electricity that is used on site or that goes to charge the batteries is registered by the generation meter at the time it is generated regardless of whether it is used onsite or sent to your battery storage system.

    Export payment

    Your export payment is currently paid on a ‘deemed’ 50% of your solar PV system’s output, regardless of how much electricity you actually export or store.

    Your FIT export tariff income will be unaffected if you store, rather than export, surplus solar electricity.

     

     

    See our happy customers below

    Catherine N

    “We regard this as a first step in a serious attempt to reduce our carbon footprint and thus a long term investment in our grandchildren's future”
    Wise Green Energy
    5
    2021-02-26T13:24:58+00:00
    “We regard this as a first step in a serious attempt to reduce our carbon footprint and thus a long term investment in our grandchildren's future”

    Janice M

    “We had our thermodynamic hot water panel fitted approximately 3 years ago now. Since we have had our new panel we have never had to use either the immersion or boiler and what we like about it is that we have hot water on tap all the time and it works at night and in the winter”
    Wise Green Energy
    5
    2021-02-26T13:27:04+00:00
    “We had our thermodynamic hot water panel fitted approximately 3 years ago now. Since we have had our new panel we have never had to use either the immersion or boiler and what we like about it is that we have hot water on tap all the time and it works at night and in the winter”

    David G

    "We were attracted by the simplicity of converting the freely available air to a hot gas, day and night. We are able to enjoy hot showers at 8am with enough hot water during the day for any other uses"
    Wise Green Energy
    5
    2019-06-19T10:31:07+00:00
    "We were attracted by the simplicity of converting the freely available air to a hot gas, day and night. We are able to enjoy hot showers at 8am with enough hot water during the day for any other uses"

    Patricia A

    "We are overjoyed with the heat pump system - hot air in the winter and best of all the air conditioning in the summer, and all for very little cost"
    Wise Green Energy
    5
    2021-02-26T13:07:49+00:00
    "We are overjoyed with the heat pump system - hot air in the winter and best of all the air conditioning in the summer, and all for very little cost"

    Peter A

    “Admittedly it can feel like taking a bit of a leap of faith, but some leaps are worth taking and can pay off, ours certainly has”
    Wise Green Energy
    5
    2021-02-26T13:01:40+00:00
    “Admittedly it can feel like taking a bit of a leap of faith, but some leaps are worth taking and can pay off, ours certainly has”

    David M

    "I have now had their system for hot water from an air-source heat pump for nearly two years. Constant hot water, lower gas bills and much less wear and tear of the gas boiler"
    Wise Green Energy
    5
    2021-02-26T12:55:43+00:00
    "I have now had their system for hot water from an air-source heat pump for nearly two years. Constant hot water, lower gas bills and much less wear and tear of the gas boiler"

    William W

    “The heat pumps and solar have given us a great return on our money, that would have otherwise been earning a pittance in other places and every time energy prices go up”
    Wise Green Energy
    5
    2021-02-26T13:09:27+00:00
    “The heat pumps and solar have given us a great return on our money, that would have otherwise been earning a pittance in other places and every time energy prices go up”

    Malcolm E

    "Had our solar assisted heat pump fitted 12 months ago. The fitting was straight forward. It has been worthwhile as we are now seeing savings on our energy bills."
    Wise Green Energy
    4
    2021-02-26T12:50:24+00:00
    "Had our solar assisted heat pump fitted 12 months ago. The fitting was straight forward. It has been worthwhile as we are now seeing savings on our energy bills."

    Mark H

    “If you're interested in saving and making money while doing your bit to save our planet then I would wholeheartedly recommend you give Wise Green Energy a call”
    Wise Green Energy
    5
    2021-02-26T13:13:45+00:00
    “If you're interested in saving and making money while doing your bit to save our planet then I would wholeheartedly recommend you give Wise Green Energy a call”

    Caroline

    "Delighted with our air source heat pump, especially as we are now working from home, as the house is always warm and toasty"
    Wise Green Energy
    5
    2021-02-26T13:04:41+00:00
    "Delighted with our air source heat pump, especially as we are now working from home, as the house is always warm and toasty"

    Paul W

    “I had a hot shower a couple of hours after your installers had left, and it was hotter than our condensing boiler had ever got the water before!”
    Wise Green Energy
    5
    2021-02-26T13:23:15+00:00
    “I had a hot shower a couple of hours after your installers had left, and it was hotter than our condensing boiler had ever got the water before!”

    Jeanne W

    "Having recently had the air source heating system installed - We no longer put our radiators on when it gets chilly and have noticed that the quality of the air in our house is much improved. It never feels stuffy! I just wish we'd had it installed earlier"
    Wise Green Energy
    5
    2021-02-26T13:11:31+00:00
    "Having recently had the air source heating system installed - We no longer put our radiators on when it gets chilly and have noticed that the quality of the air in our house is much improved. It never feels stuffy! I just wish we'd had it installed earlier"

    John W

    “I'm very happy with £174/m savings, if it keeps saving me at this rate it will have paid for itself in less than five years and could be even less than four”
    Wise Green Energy
    5
    2019-06-14T13:16:14+00:00
    “I'm very happy with £174/m savings, if it keeps saving me at this rate it will have paid for itself in less than five years and could be even less than four”
    4.9
    13
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