Why kWh Savings Alone Don't Tell the Whole ROI Story
Solar panels mainly lower total usage, but a battery or a shifted charging moment for an EV charger can also lower a client's peak power draw — or raise it, if a heat pump gets added without smart control. Each of these effects feeds through into the Flanders capacity tariff, independent of the savings on regular usage.
Solar, Battery, Heat Pump: Different Effects on Peak Power Draw
A payback period that only looks at kWh savings can make an investment look more or less favourable than it really is — depending on whether the client's capacity tariff drops or rises alongside it. For a client with a pronounced peak profile, that effect can be the difference between investing or not.
"Solar Only" vs "Solar Plus Battery": The Capacity Tariff Tie-Breaker
Every generated financial recommendation shows the capacity tariff (in euros per kW, per year) as an explicit line item in the calculation — not a hidden assumption, but a visible part of the figures a client sees. For a client torn between "solar only" and "solar with battery," the effect on the capacity tariff is often the deciding argument — a battery that flattens peaks does so for the grid connection too, not just for their own usage.