Solar PV Size
7.2 kWp existing solar PV system
Recent Bespoke PV installation
Battery Expansion and EPS Backup Upgrade in Cowplain, Waterlooville
Completed February 2026
A follow-on upgrade to a Cowplain solar and battery installation, adding a second battery and EPS backup capability with clearly separated backed-up and grid-only circuits.
7.2 kWp existing solar PV system Solar PV
EP11 plus EP12 battery storage Battery
Fox ESS EP12 battery, existing EP11 battery, EPS backup, double row FuseBox consumer unit
Cowplain, Waterlooville, Hampshire Installation
Installation Specification
Key details from this Bespoke PV installation.
Battery Storage
EP11 plus EP12 battery storage
Equipment
Fox ESS EP12 battery, existing EP11 battery, EPS backup, double row FuseBox consumer unit
Location
Cowplain, Waterlooville, Hampshire
Project Overview
Following the original solar and battery installation, the Cowplain property was later upgraded with additional battery capacity and EPS backup capability.
The initial installation included a Fox ESS 10kW inverter and EP11 battery. As the customer’s energy requirements developed, Bespoke PV returned to expand the battery system and implement an EPS backup arrangement for the property.
A second Fox ESS EP12 battery was added to increase the available storage capacity. This allowed the property to make better use of stored energy and provided the foundation for a more resilient backup setup.
The upgrade also included replacement of the consumer unit, with a double row FuseBox board selected to clearly separate the backed-up circuits from the circuits that would remain grid-only.
Upgrade at a Glance
Key details from the Cowplain battery expansion and EPS backup upgrade.
EP12
Second Fox ESS battery added
EPS
Battery backup capability implemented
FuseBox
Double row consumer unit installed
3
Grid-only high-load circuits excluded
EP11 + EP12
Expanded battery storage system
Designing Backup Power Around Real Household Use
A good EPS design is not simply about putting every circuit onto backup power. It is about deciding which circuits are genuinely useful during a grid outage and which loads would deplete the batteries too quickly.
For this property, the EV charger, external power socket for the customer’s camper van and electric shower were kept as grid-only circuits. This means they are not currently backed up by the EPS system, preserving stored energy for more practical household circuits during an outage.
This approach gives the customer better resilience without compromising the battery reserve unnecessarily.
Consumer Unit Replacement and Circuit Separation
A double row FuseBox consumer unit was selected to provide a clear and organised backup power layout.
As part of the EPS upgrade, the existing consumer unit was replaced. Bespoke PV selected a double row FuseBox board to create a clear separation between circuits backed up by the EPS system and circuits that remain grid-only.
This separation makes the installation easier to understand, inspect and maintain. It also makes it clear which household circuits will continue to operate from battery backup during a grid outage and which high-load circuits have deliberately been excluded.
The grid-only circuits include the EV charger, the external power socket used for the customer’s camper van and the electric shower.
What the Upgrade Added
The second phase of works focused on additional storage, backup power and clear electrical separation.
Second battery added
A Fox ESS EP12 battery was added to increase the available storage capacity.
EPS backup implemented
Selected household circuits can be supplied from the battery system during a grid outage.
Consumer unit replaced
A new double row FuseBox board was installed as part of the EPS setup.
Backed-up circuits separated
The board layout clearly separates EPS-backed circuits from grid-only circuits.
High-load circuits excluded
The EV charger, camper van socket and electric shower remain grid-only to protect battery reserve.
Future-ready resilience
The system now provides a stronger foundation for both day-to-day energy management and outage support.
Project Gallery
Current and placeholder images for the Cowplain EPS upgrade.
The Result
By adding a second EP12 battery and implementing EPS, the customer gained a more resilient and flexible home energy system.
The replacement double row FuseBox consumer unit gives the installation a clear structure, separating backed-up circuits from grid-only high-load circuits. This helps preserve battery capacity during outages while keeping essential or useful circuits available from stored energy.
As a follow-on to the original solar and EP11 battery installation, this upgrade gives the property a stronger battery platform and a more practical backup power arrangement.
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