Solar Thermal Heating
Typical indirect heat-transfer route
- Sunlight
- Solar thermal collector
- Heat-transfer circuit
- Process heat
ISO-Certified Manufacturer
ISO 9001 · 14001 · 45001Solar PV & Direct-DC
Process Heating
Project-engineered DC electric heating for integrating photovoltaic electricity with industrial process heat.
Solar-to-heat routes
Two Different Routes from Solar Energy to Industrial Heat
Photovoltaic-Electric Heating
Solar electricity supplied to an engineered heating system
- Sunlight
- PV modules
- Power & control system
- Electric heater
- Process heat
Solar thermal collectors capture heat and deliver it through a heat-transfer circuit—for example, water or thermal oil selected for the operating temperature. This is a typical indirect arrangement; other solar thermal configurations are possible. PV modules generate electricity, which supplies an electric heater through a project-engineered power, control and protection system.
System architecture
The Heater Is Only One Part of the DC Heating Architecture
A complete PV-to-heat solution includes power generation, electrical distribution, heating equipment, the process load and plant controls. XGTHERMAL focuses on the heater-side system and its agreed interfaces.
PV Generation
DC Power Architecture
Project power-system scope
Electrical
Battery Limit
Battery Limit
DC Heating System
Process / Thermal Load
Plant Control System
XGTHERMAL heater-side engineering & interfaces
Supply boundaries are agreed for each project. PV modules, complete PV EPC, site-wide MPPT / inverter systems, BESS and plant-wide EMS are not part of XGTHERMAL’s normal scope unless specifically agreed. The process load and plant control system are shown as interfaces, not as an implied equipment supply.
Engineering reality
Direct DC Does Not Mean Simply Connecting PV Panels to a Heater
Photovoltaic output varies with irradiation and operating conditions. The heater must work within a defined DC voltage and current envelope, with DC-rated switching, isolation and protection coordinated with the upstream supply.
Controlled heater power, temperature feedback and process-safety interlocks must work together across the operating range. The electrical route alone does not establish stable temperature control.
Direct DC does not automatically mean inverter-free, converter-free, MPPT-free or power-electronics-free. Upstream topology remains project-specific.
Key engineering areas
Engineering the Interface from DC Power to Process Heat
Electrical Architecture
- DC operating envelope
- Switching and isolation
Thermal Design
- Heating duty and medium
- Flow and temperatures
Control & Protection
- Temperature feedback
- Overtemperature protection
Plant Integration
- DCS / PLC interface
- Operating philosophy
System topologies
The Right PV-to-Heat Architecture Depends on the Project
The architecture is selected around the available power system, heating duty and operating strategy. These three arrangements illustrate different electrical relationships.
APV-Integrated DC Heating
PV Generation
DC Electrical Architecture
DC Heater
Process Heat
A dedicated PV supply feeds the heater through an engineered DC electrical architecture.
BPlant DC-Bus Heating
PV
Other DC Sources
Industrial DC Bus
DC Heater
Process Heat
PV and/or other DC sources feed a common industrial DC bus; the heater is one connected load.
CHybrid Electrical Heating
PV
Plant Power
Coordinated Electrical Supply
Heater
Process Heat
PV and plant power converge through a coordinated electrical supply and control architecture.
Conceptual integration arrangements only, not three configurations delivered in the PV-powered industrial air heating project. Supply compatibility, conversion stages, protection and operating strategy require project-specific engineering.
Typical applications
Where PV-to-Heat Makes Engineering Sense
When it may be a strong engineering candidate
- Suitable DC infrastructure
- Significant process-heat demand
- Available on-site PV
- Controllable heating duty
- Defined electrical battery limit
Representative industrial applications
- Process air heating
- Gas preheating
- Liquid process heating
- Tank / vessel heating
- Thermal-storage charging
- Selected oil & gas duties
Solar electric process heat is a Power-to-Heat (P2H) application. Final suitability depends on actual site, electrical and process conditions, including the relationship between available PV power and heating demand.
Project experience
500 kW / DC1000V — From Architecture to Delivered Equipment
PV-Powered Industrial Air Heating Project
- Heating duty
- 500 kW
- DC supply
- DC1000V
- Heating groups
- 5 × 100 kW
XGTHERMAL delivered a photovoltaic-powered DC electric heating system for industrial air heating, divided into five 100 kW heating groups.
Siemens SIMATIC S7-200 SMART PLC; local / remote operation; DCS interface; Modbus RTU / RS485. Protection includes group-level overtemperature protection and emergency shutdown.
Engineering inquiry
Engineering Data We Need
PV / DC Power Data
- Voltage range
- Available power
- Upstream architecture
- Electrical battery limit
Process Data
- Medium
- Flow
- Inlet / target temperature
- Pressure
Site & Control Data
- Ambient conditions
- Hazardous-area requirements, where applicable
- Control and communication interfaces
- Operating philosophy
Design and possible compliance routes are evaluated against the final configuration, agreed project boundaries and destination-market requirements. Certification is subject to project review; no ATEX, IECEx or EAC certification is implied.
Frequently asked questions
Questions About Solar PV & Direct-DC Process Heating
What is photovoltaic-electric heating (PV-EH)?
PV-EH uses electricity generated by photovoltaic modules to supply electric heaters and produce useful industrial process heat. The electrical architecture depends on the source, load, operating strategy and plant interfaces.
What is photovoltaic direct electrical heating (PV-DEH)?
PV-DEH describes a photovoltaic-electric heating route using DC electricity within the heating architecture. The term alone does not define which conversion, control or protection equipment is needed.
Can industrial heaters operate from DC power?
Yes, when the heating elements, switching, isolation, protection, controls and plant interfaces are engineered for the defined DC supply and process duty.
Can solar PV be connected directly to an industrial electric heater?
An industrial heater should not be connected to PV panels without an engineered electrical and control architecture. Voltage and current range, switching, isolation, protection, temperature control and process safety all require review.
Does direct-DC heating always eliminate an inverter?
No. A DC heating route may not require an inverter in the heater supply path, but the overall project may still require inverters, converters, MPPT or other power electronics. The upstream architecture remains project-specific.
What information is needed for engineering evaluation?
Provide the DC voltage and power envelope, upstream architecture and battery limit, process medium, flow, temperatures and pressure, site conditions, control interfaces, operating philosophy and applicable project requirements.
Does XGTHERMAL supply the complete PV system?
XGTHERMAL normally engineers the heater-side electrical interface, thermal design, protection, control and plant integration. PV modules, complete PV EPC, site-wide power electronics, BESS or plant-wide EMS are outside the normal supply scope unless specifically agreed.
Let’s discuss your
heating requirements.
Share your specifications or drawings with our engineering team.