Installing solar panels alone is not enough to achieve the expected result. A solar installation is only effective if it is precisely sized to the site’s actual consumption, and built on three complementary components: the panels, battery storage, and an automation system that controls consumption based on production.
Correct sizing above all
The starting point of a solar project is not the available roof area, but the site’s consumption curve: how much electricity is used, and above all at what times of day. An undersized system leaves a significant share of possible savings on the table; an oversized system ties up an investment that will never be fully recouped.
The real return on an installation depends on the synchronisation between solar production (concentrated during the day) and the site’s needs. It’s this analysis — previous years’ bills, annual consumption, distribution throughout the day — that must come before any choice of equipment.
The three components of a truly effective installation
1. Solar panels, which produce the energy — the most visible part, but not sufficient on its own.
2. Battery storage, which stores the energy produced during the day so it can be used when production drops or stops, instead of selling it back at a low price or losing it.
3. An intelligent automation and control system (energy management system / EMS), which measures production and consumption in real time and automatically triggers the site’s equipment when solar production is available.
Without intelligent control, the self-consumption rate of a residential solar installation is generally between 30 and 50%. With a well-tuned automatic control system, this rate can reach up to 70% with no particular effort from the occupants.
This is why we don’t offer panel-only installations: for us, a solar installation systematically includes all three components, sized together.
Our technology partners
We notably work with Huawei, whose FusionSolar solution combines an inverter with modular LUNA2000 batteries: intelligent energy-flow management based on consumption and production, several operating modes (maximum self-consumption, peak/off-peak hours, grid injection), real-time monitoring via an app, and automatic switch to backup mode in the event of a grid outage.
We also install Deye hybrid inverters, recognised for their high efficiency, compatibility with next-generation lithium (LiFePO4) batteries, automatic switch to backup mode, and fine-grained configuration that precisely adapts the system to the site’s actual constraints.
Why choose Delta-M
We don’t sell a surface area of panels, but a complete system sized to your actual consumption — panels, storage and automatic control included, for a measurable result rather than a promise.
We also handle general electrical work and the upgrades that often accompany a solar installation. Delta-M is RGE-certified (Reconnu Garant de l’Environnement) for its solar installations, a prerequisite for accessing government grants and energy-renovation financing schemes.
Frequently asked questions
Why aren’t solar panels alone enough?
Without storage or automatic control, a large share of the energy produced during the day is lost or sold back at a low price if it isn’t consumed at the moment it’s produced.
Is a battery always necessary?
In the vast majority of cases, yes: it’s what lets you use energy produced during the day at another time, rather than relying solely on the grid outside production hours.
What does the automatic control system do?
It automatically triggers your equipment (water heater, heating, EV charging) when solar production is available, which significantly increases the self-consumption rate with no manual intervention.
How is my installation sized?
Based on your actual consumption (bills, hourly distribution), not simply the available roof area.