Battery storage and SEG export, engineered together
Commercial lithium-ion battery storage sized to your half-hourly load, plus an optimised SEG export contract so every kWh of solar generation either powers your site or earns at the best available rate.
Solar without storage exports most of its value at low midday prices. Suncharge designs the battery, inverter, and SEG export contract together, so generation is captured at the highest possible value, hour by hour.
Maximise self-consumption
A correctly sized battery shifts midday solar generation into evening and overnight load, lifting self-consumption from 30-40% to 70-90% on most commercial sites.
Hedge tariff and outage risk
Lithium-ion storage cuts exposure to volatile grid tariffs, capacity charges, and DUoS red bands, and gives critical operations a soft landing during short outages.
Stack export revenue
We tender your Smart Export Guarantee (SEG) contract alongside the install, comparing fixed, variable, and half-hourly export tariffs so surplus kWh land at the best available rate.
Why battery sizing decides the ROI
A solar array is only the first half of the asset. Without a battery and a fit-for-purpose SEG tariff, most commercial sites give up 50-70% of their generation to the grid at low export prices, and still draw expensive evening power.
We design lithium-ion storage and export contracts together, modelled against your half-hourly load. That is how solar shifts from a five-figure bill cut to a six- or seven-figure one over the asset life.
Outcomes we optimise for
- Lift on-site self-consumption from typical 30-40% to 70-90% with the right battery sizing.
- Avoid DUoS red-band and capacity charges by discharging through peak windows, sized to your half-hourly load.
- Choose between fixed SEG, variable SEG, and half-hourly export so volatility sits where you want it.
- Unlock PPA, lease, and capex models so the funding route fits your balance sheet, not the other way round.
- Strengthen ESG and Scope 2 reporting with verifiable on-site generation, storage, and export data.
Battery storage configurations
How a battery is connected, sized, and dispatched changes the payback dramatically. We design the topology around your roof, your load, and your DNO position.
Behind-the-meter lithium-ion
AC- or DC-coupled lithium-iron-phosphate (LFP) battery cabinets sized in 50-500 kWh blocks, designed to absorb your solar peak and discharge it across your evening and night load.
Hybrid inverter retrofit
Where you already have a string PV system, a hybrid inverter and DC-coupled battery can be retrofitted without disturbing the existing array, often inside a 2-3 day site visit.
Peak-shaving & DNO capacity
For sites near their agreed kVA, batteries can shave demand peaks and defer a costly DNO capacity upgrade, sometimes paying back on the avoided connection works alone.
SEG export and PPA routes
Surplus generation deserves the same rigour as the kit. We compare fixed SEG, variable SEG, half-hourly settlement, and PPA structures in plain English.
Fixed SEG export tariff
A guaranteed pence-per-kWh rate from your supplier for every unit you export. Predictable revenue, easy to model, ideal for boards that want certainty.
Variable SEG export tariff
Export rate tracks a published index. Higher upside in tight markets, lower in soft ones. We compare net-of-fees outcomes against the fixed alternative.
Half-hourly export (system sell)
Settlement against half-hourly wholesale prices. Best when paired with battery storage and an optimiser that can dispatch around price peaks.
Power Purchase Agreement (PPA)
A funded route where a third party owns the asset and sells you on-site generation at a fixed pence-per-kWh, often well below grid rates, with no upfront capex.
Private wire & sleeved supply
Where neighbouring sites or tenants can take generation directly, a private wire or sleeved arrangement can capture more value than wholesale export.
Sizing storage to your real load
We model how your site actually behaves, hour by hour. That is the difference between an oversized battery sitting half-empty and one paying back inside 6-8 years.
Generation peaks
Midday solar surpluses need either an export route that pays fairly or a battery to absorb them. We size storage so you stop spilling free electricity to the grid at low prices.
Half-hourly load shape
EV charging, refrigeration, compressors, and shift patterns shift your load through the day. Battery dispatch and SEG contract should match that shape, not a generic profile.
Seasonality & DNO limits
Winter generation is a fraction of summer. We model a full year of half-hourly data and any DNO export limit so the battery and contract make sense in every season.
Solar, storage, and export under one roof
Suncharge delivers the panels, the inverter, and the lithium-ion battery as a single engineered system, with the SEG export contract tendered alongside. That means no finger-pointing between installer and supplier when commissioning, metering, or settlement need to be solved.
Whether you already export or are scoping a new system, we bring the same discipline: transparent comparisons, supplier-neutral advice, and a model your board can sign off.
Talk to a specialist about battery & SEG
Share a recent electricity bill and, if you have them, current generation or export figures. We will outline a battery sizing and SEG export strategy that fits your site and your appetite for risk.
New to battery storage? Start with our services overview or the commercial solar hub.