No plant room? No problem.
The Pramac BSO range is a weatherproof all-in-one outdoor cabinet. Drops onto a pad in your yard or car park. Up to 188 kWh per cabinet, side by side expandable. No building works, no internal space lost.
The Pramac BSO earns its keep when:
Your yard, car park or compound has room, but your building doesn’t
You need the project live before a building works programme could finish
You’re retrofitting storage onto an existing solar installation
You’re building out EV fast charging and need a buffer to the grid incomer
Pramac BSI specifics, without the spec sheet
Pad, drop, commission
Pad
Generator Pro’s engineers confirm the location and pad specification. Groundworks arranged to suit your site.
Drop
The Pramac cabinet (1.3m × 1.35m × 2.4m, 2.6 tonnes) arrives on a HIAB and is lifted onto the pad. Typically a single day operation.
Commission
Cabling, G99 and G100-compliant grid connection, EMS integration and handover. Your people run it; we support via maintenance contract or adhoc service calls.
Where bill savings and grid income come from
A Pramac BESS on a UK commercial site has four routes to paying for itself. Most of them start the moment you switch it on, not after a payback period.
Cut peak demand charges
Most UK commercial tariffs charge a premium between 4pm and 7pm on winter weekdays. This is known as the DUoS red band. Discharging from the battery during those windows shifts your draw out of the high-rate band.
Capacity Market revenue
National Grid runs annual auctions (T-1 and T-4) paying assets to stay available for grid stress events. A qualified Pramac BESS earns a fixed monthly capacity payment for being on standby.
Get the right price for your PV
Without storage, exported solar pays a fraction of import price under SEG. With a battery on site, you keep that energy and discharge it through the evening shift.
Flexibility services
DNOs and the Balancing Mechanism increasingly pay site batteries for short-notice flexibility through schemes like DFS, Local Flexibility Markets and the BM. Income on top of bill savings.
Which mix applies to your site depends on your tariff, your existing solar, and whether you opt to enter the Capacity Market.
We work that out as part of the site survey before any commitment.
Proven kit, UK support
Pramac
Builds the BSO as a genuine all-in-one unit: battery, inverter, EMS, cooling, heating and aerosol fire suppression in one IP54 cabinet. 7,300 cycles at 95% DoD.
Generator Pro
Authorised Pramac dealer in the UK. Site surveys, pad specification and installation arranged to suit your site, with all work fully G99 and G100-compliant.
Warranty
5 years product, 10 years performance, included with every BSO system.
Pramac BSO in practice
Pramac’s e-mobility work across Europe points the same way: when public and fleet EV chargers outpace the available grid connection, the answer is a battery buffer. An outdoor BSO on a pad beside a bank of DC fast chargers covers the peaks, lets operators go live without waiting on a DNO reinforcement, and protects the site from the cost of a full grid upgrade.
See if a Pramac BSO fits your site
Straight answers to the questions we get asked first
How long does installation take?
Most Pramac indoor and outdoor systems are commissioned within two to four weeks of delivery. Container systems are often faster because there’s less site work.
How much space do I need?
A Pramac indoor 109 kWh rack needs roughly a single phone box footprint. An outdoor cabinet sits on a pad about 1.3m by 1.4m. A 20ft container needs a concrete pad the length of a shipping container. We confirm exact dimensions during the site survey.
Will it work with my existing solar or backup generator?
Yes. Pramac kit ties into most solar inverters and generator controllers through standard Modbus TCP and REST interfaces, and the Pramac Smart Energy Controller coordinates everything automatically.
What happens if something fails?
You call Generator Pro. We can cover you via an ongoing maintenance contract or handle adhoc service calls as they come up. Pramac warranty covers product for a minimum of five years and battery performance for ten; the BSC MAX container range carries ten years on both.
