Battery storage that shifts cheap energy into expensive hours

Self consumption uplift is the most predictable. Energy that would have been exported at a low rate is instead used on site at your full import rate, which is several times higher. The gap between those two numbers is the whole argument, and it is why export heavy sites see the strongest storage cases.

Peak shaving attacks a different bill line. Where your contract charges on the highest half hour of demand in a period, a battery that discharges into those peaks reduces the charge for the whole period. Sites with short, sharp load spikes often save more here than they do on energy.

Flexibility services pay for making capacity available to the grid. They can be real income, but they compete with the other two uses for the same kilowatt hours, so a battery cannot be counted twice. The stacking order needs deciding at design stage.

The common mistake is sizing storage as a percentage of the solar system. The right basis is the shape of your demand after solar, which is what determines how much energy is genuinely available to shift and how many hours it has to cover.

Half hourly data settles it. It shows the evening tail, the overnight base load and how often peaks recur, and it exposes the days when a large battery would simply sit idle. An oversized system is the most common way to ruin an otherwise sound storage case.

Power rating matters as much as capacity. A battery with plenty of stored energy but insufficient output cannot clip a sharp peak, and one with high output and little capacity cannot hold it for long enough. Both figures are specified against your actual profile.

Commercial electricity bills are not one number. Distribution use of system charges vary by time band, transmission charges are levied on demand during peak periods, and the capacity charge reflects the supply you have reserved. Storage can move consumption out of the expensive bands.

That means the value of a battery depends on your contract as much as your building. Two identical sites on different supply agreements can produce materially different results, which is why an energy cost audit usually runs alongside a storage assessment.

We would rather tell you a battery does not pay on your site than model it optimistically. Where the numbers do not work, the honest answer is more useful than a proposal.

Lithium iron phosphate is the usual commercial chemistry, chosen for its thermal behaviour and cycle life rather than for energy density. Even so, a commercial installation needs a fire strategy, separation distances from occupied space and boundaries, ventilation, and clear access for the fire service.

Insurers increasingly ask specific questions about battery installations, and the answers are easier to give before the equipment is ordered. We flag insurer engagement at feasibility, not at handover.

Siting is often the practical constraint. Outdoor containerised units avoid most of the building related issues but need space and a foundation, while indoor installations need a compartment that satisfies the fire strategy. Installers in the network handle the detail.

Battery warranties are usually expressed as a number of cycles or as total energy throughput, with a guaranteed remaining capacity at the end of the term. A term of years or a stated cycle count, with a guaranteed share of the original capacity remaining at the end of it, is the common shape, but the terms vary by manufacturer and should be compared directly.

How you operate the battery affects how quickly it ages. Deep daily cycling for flexibility earnings wears it faster than gentle self consumption shifting, so the revenue plan and the warranty need to be consistent with each other.

End of life responsibilities, including removal and recycling, belong in the proposal rather than being discovered later. Ask for them in writing at quotation stage and we will make sure the question is put.