Maximising battery storage by charging at cheap rates from the grid

Pdf free icon Battery Storage Guide  With the right battery storage system, it's possible for a household to store enough electricity to supply the full demand of the property. 

  Automatic discount £5k+ vat spend: 3%
Automatic discount £10k+ vat spend: 4%
Automatic discount £15k+ vat spend: 5%

Battery system Availability Type On or Off grid Multiple chargers IP rating Charge/
Discharge rate
Maximum Capacity Typical Battery cost/kWh +vat Typical Kit cost/kWh +vat Depth of Discharge
GSL All In One 5.5kw Hybrid 20.48kwh Good Floor mounted On & Off grid No 55 5kWh 40.96kWh £240 £281 90%
Sunsynk 3.6kw Hybrid / GSL 20.48kwh Good Floor mounted On & Off grid Yes 55 3.6kWh 40.96kWh £240 £308 90%
Sunsynk 5kw Hybrid / GSL 20.48kwh Good Floor mounted On & Off grid Yes 55 5kWh 40.96kWh £240 £333 90%
Sunsynk 8kw Hybrid / GSL 20.48kwh Good Floor mounted On & Off grid Yes 55 8.8kWh 40.96kWh £240 £397 90%
Sunsynk 5kw Hybrid / Sunsynk 5.1 20.48kwh Good Stackable On & Off grid Yes 55 5kWh 163kWh £238 £300 95%
Sunsynk 5kw Hybrid / Sunsynk BYD 21.36kwh Good Stackable On & Off grid Yes 55 5kWh 76.8kWh £292 £339 100%
Solis 3kw RAI / Pylontech 19.2kwh Good Stackable On grid No 55 3.3kWh 29kWh £236 £274 95%
Solis 6kw Hybrid / Pylontech 19.2kwh Good Stackable On grid No 55 5kWh 29kWh £236 £301 95%
Givenergy 6kw AC All In One 13.5kwh Good wall or floor mounted On & Off grid No 65 6kWh 81kWh £411 £411 100%
Givenergy 5kw Hybrid Gen3 19kwh Good wall or floor mounted On grid No 65 3.6kWh 47.5kWh £275 £357 100%
Givenergy 3kw AC 19kwh Good wall or floor mounted On grid No 65 2.5kWh 47.5kWh £275 £330 100%
Libbi All In One 5kw Hybrid 20kwh Pre-order All In One On grid No 65 5kWh 20kWh £512 £613 90%
Alpha Smile B3 Plus AC 20kwh Good All In One On grid No 65 3kWh 30kWh £341 £387 95%
Alpha Smile 5 5kw Hybrid 20kwh Good All In One On grid No 65 5kWh 60.1kWh £335 £404 95%
Huawei 5kw Hybrid 20kwh Good wall or floor mounted On grid No 66 5kWh 30kWh £559 £611 100%
Fox HV Cube 5kw Hybrid 20.16kwh Good Stackable On grid No 65 5kWh 28.21kWh £273 £319 90%
Fox HV Cube 5kw AC 18.64kwh Good Stackable On grid Yes 65 5kWh 28.21kWh £295 £332 90%
Fox HV2600 5kw AC 18.2kwh Good Stackable On grid No 55 5kWh 18.2kWh £333 £312 90%
SolaX 5kw Hybrid 17.4kwh Good wall or floor mounted On grid Yes 55 6kWh 17.4kWh £312 £394 90%
SolaX 3.6kw AC 17.4kwh Good wall or floor mounted On grid Yes 55 5kWh 17.4kWh £338 £364 90%

 

 

 Sizing & selecting which battery storage system is right for you

Two key factors to take into consideration when selecting the battery storage system are the storage capacity and your peak demand.

The advisable storage capacity can be calculated by looking at your average usage over a 24hr period, and determining how much of this amount you wish to be  able store. If you don't have a smart meter this can be found on your electric bills or by contacting your supplier. Over-sizing will mean that more capital will be invested than required, but can allow for increased usage in the future. Under-sizing usually results in lost potential savings, but maximises the capital invested.

If you have solar pv then you need to look at how much spare electricity you are generating during the day time that can be stored and how much of this is worthwhile storing to for after daylight hours. This can also be combined with how much you want to charge at night time from the grid to top up the batteries.

Peak demand is the maximum electricity demand at any given time of the day. It is important to know your peak demand to ensure the system you go with will meet either all or most of your demand. A system that cannot supply this demand may mean you still need to draw significant amounts of electricity from the grid during costly peak-rate hours. For example, if you regularly have 5kW of high demand appliances running, and you only have a battery system that can discharge at 2.5kWh, you will still require 2.5kWh from the grid. Whereas If you have a system that can discharge at 5kWh then you will meet your peak demand without needing to draw from the grid.

 

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