ASW MODULAR SYSTEM
10 kWh battery
£3,950
Cash price · standard installation included
Free upgrade · worth £150Equivalent system: £4,100
A 6 kW inverter at no extra cost instead of the standard 5 kW inverter.
Enquire about this offerSEPTEMBER 2026 OFFERS
More power.
A better package.
Two simple inverter offers on new ASW batteries from 10 to 25 kWh. Get a free upgrade to 6 kW, worth £150, or choose 8 kW for just £150 extra.
This September offer has ended. The prices below are for reference. Request our current prices.
MEET THE NEW SYSTEM
Slim storage.
Separate inverter.
The modular battery is just 185 mm deep. A separate hybrid inverter gives you a choice of output to suit the appliances you use together.
10–40 kWhBattery range
10 yearsProduct warranty
MODULAR BATTERY
6 kW HYBRID INVERTERYOUR SEPTEMBER PACKAGE
Choose your storage.
Every package below includes the battery, selected inverter, delivery and standard installation. No solar panels required.
ASW MODULAR SYSTEM
15 kWh battery
£5,250
Cash price · standard installation included
Free upgrade · worth £150Equivalent system: £5,400
A 6 kW inverter at no extra cost instead of the standard 5 kW inverter.
Enquire about this offerASW MODULAR SYSTEM
20 kWh battery
£6,300
Cash price · standard installation included
Free upgrade · worth £150Equivalent system: £6,450
A 6 kW inverter at no extra cost instead of the standard 5 kW inverter.
Enquire about this offerASW MODULAR SYSTEM
25 kWh battery
£7,800
Cash price · standard installation included
Free upgrade · worth £150Equivalent system: £7,950
A 6 kW inverter at no extra cost instead of the standard 5 kW inverter.
Enquire about this offerPower ratings: the 6 kW H-S2 inverter has a 5 kW battery charge/discharge limit. The 8 kW SH supports up to 8 kW battery charge/discharge. We’ll check the output available for your home.
Not sure which capacity fits? Use your electricity usage to explore the right size. The savings calculator includes eligible September package prices, so your savings and payback use the same price shown here.
WHEN YOU NEED MORE OUTPUT
Same storage.
More power at once.
The 8 kW option can supply more power at one time than the 6 kW inverter. That can be useful when several appliances run together. It doesn’t increase the battery’s stored energy.
The 8 kW option is available on every September package, from 10 to 25 kWh, for exactly £150 more than the 6 kW package. We’ll check the output, charging window and your electrical supply before recommending it.
View inverter dimensionsThe offer, clearly explained.
What’s included
- Battery and the inverter shown in your chosen package.
- Delivery and professional standard installation.
- Up to 15 metres of surface-run cable and 3 metres of trunking.
- DNO application included, with grid requirements confirmed during assessment.
- 10-year product warranty, subject to the terms for your system.
Before you order
- September promotion: 15–30 September 2026. Order before 1 October, subject to availability.
- Cash package prices shown. Where an equivalent standard price is displayed, it is for the same battery capacity and inverter output.
- The free 6 kW inverter upgrade, worth £150, applies to the new ASW 10, 15, 20 and 25 kWh systems. The 30, 35 and 40 kWh systems remain available at standard prices and are excluded from this offer.
- Choose an 8 kW inverter for exactly £150 more than the displayed 6 kW September package price. No additional percentage discount applies.
- Compatible existing solar connection: +£300. Optional EV charger: +£300. EPS backup is quoted separately.
- Installation suitability, VAT treatment and any additional work are confirmed in your written quote. Enquiring does not reserve stock or place an order.
LET’S FIND YOUR FIT
A better package starts with your home.
We’ll check your usage, space and tariff before you decide.