Frequently asked questions

Capacity is determined after reviewing consumption, the load profile, allocated grid capacity, available area, operating requirements and connection conditions. Maximising installed capacity is not always the technically or economically optimal solution.

We need the site address and use, electricity bills, allocated grid capacity, any available load profile, the supply diagram, main loads, available area and the required operating mode. Missing data can be established through a technical site survey or additional metering.

Allocated capacity defines the contracted consumption limit and is important when assessing the connection point, cables, protection, metering and allowable PV and ESS operating modes. It is not the same as the actual maximum demand, so it is evaluated together with the load profile.

Interval load data enables more accurate PV and ESS sizing. It can be uploaded as an Excel or PDF file through the technical questionnaire. Where it is unavailable, the initial assessment can start from bills and main-load data, with temporary metering added as a separate stage.

ESS is considered when higher self-consumption, peak-demand reduction, backup supply, island operation, Zero Export or energy shifting between time periods is required. Power and capacity are sized against the site's actual operating profile.

Yes, following a technical review of the existing inverters, AC and DC architecture, switchboards, protection, metering, communications and control capability. The solution may be AC-coupled, DC-coupled or hybrid depending on the equipment and project objectives.

A grid-tied PV system operates in parallel with the distribution network and normally stops during an outage. A hybrid system combines PV and ESS and can support selected backup loads when correctly engineered. An off-grid system operates without the public grid and requires a dedicated energy balance, reserve capacity and coordinated control of generation and loads.

The sequence typically includes an application, input data, connection opinion or conditions, project documentation, coordination, construction, testing and commissioning documents. The exact steps depend on system capacity, operating mode and the requirements of the relevant DSO.

The scope may include site assessment, energy studies, detailed design, equipment selection and supply, installation, electrical connections, protection, metering, automation, configuration, testing, protocols, training and system handover. The exact scope is defined in the technical proposal and contract.

The contract defines the covered equipment, inspection intervals, remote monitoring, preventive checks, measurements, thermographic inspection, alarm analysis, response times and conditions for emergency visits. Service protocols are issued after inspections, recording findings and recommended actions.

We provide site surveys, design, construction and maintenance in Kardzhali and the surrounding region, as well as for projects elsewhere in Bulgaria. Organisation and lead times are defined according to location, scope and the required coordination activities.

Lead time and price depend on system power and complexity, site conditions, design disciplines, grid-connection requirements, selected equipment, mounting structure, cable routes, switchboards, protection and testing. A final proposal is prepared after sufficient technical data has been reviewed.

ESS is the general term for an energy storage system, while BESS denotes a battery-based energy storage system. In practice the terms are often used together, but the complete system includes not only the battery, but also the BMS, power converter or hybrid inverter, metering, protection, control and monitoring.

Yes, after reviewing the inverters, AC and DC architecture, boards, protection, metering and communications. The solution may be AC-coupled, DC-coupled or hybrid according to the installed equipment and system objectives.

They are determined from the load profile, PV production, peak demand, required backup duration, permitted charge and discharge power and the selected control strategy. A larger capacity is not always the most effective solution.

The scope can include complete engineering or individual stages: design, supply, installation, configuration, testing, commissioning and maintenance. Technical compatibility and available design records are checked before equipment supply.

Yes, when the inverter or PCS, transfer topology, protection and control are designed for that mode. Specific backed-up loads and the required autonomy are defined during sizing.

Price depends on power and usable capacity, LV or HV architecture, inverter or PCS, BMS and EMS, boards, protection, cables, installation conditions, integration, testing and required documentation. A final proposal follows the technical assessment.

We provide assessment, design, supply, installation and maintenance in Kardzhali and the surrounding region, as well as for projects elsewhere in Bulgaria. Organisation depends on location, system power and scope.

LV cable lines operate up to 1 kV and typically supply end users and boards. MV cable lines operate above 1 kV and up to 35 kV, connecting substations, switchgear, generation and energy facilities.

A substation is used when the site connects at medium voltage and conversion to the operating low voltage is required. Type, rating and configuration depend on the grid conditions, loads, operating mode and reserve.

0.4 kV is standard for general LV loads. 0.6 and 0.8 kV are used for specific industrial or energy solutions, including certain large converters. The final voltage follows the equipment and connection conditions.

Route and profile, electrical and mechanical calculations, conductor, pole, insulator and fitting selection, foundations, grounding, protection, crossings, easements, specifications and the required approvals.

Yes. The scope may be full engineering or an individual stage: assessment, design, coordination, supply, construction, testing, commissioning or maintenance, depending on available documentation and customer responsibilities.

Inspections and measurements are recorded in the applicable protocols. Construction projects also receive as-built drawings, technical records and handover and commissioning documentation.

We analyse consumption, load profiles, available area, grid connection and the target operating mode. Capacity is selected for a sound technical and economic result, not merely to fill the available space.

When the project requires higher self-consumption, peak-power reduction, backup supply, Zero Export or island operation. Energy capacity and power are sized against the actual load.

The system measures energy flow at the grid connection point and controls the inverters so that export does not exceed the configured limit.

Yes, when the inverter, battery, protection and electrical architecture are designed for backup or island operation. This is defined at the technical-design stage.

Site assessment, analysis and sizing, project documentation, supply, construction, testing, configuration, commissioning, monitoring and maintenance.

Yes. We provide diagnostics, retrofits, ESS integration, inverter replacement, protection corrections, communications, control and monitoring upgrades.