Complete technical data sheet for SolBox, the DC MPPT solar water heating controller by AXINAR. Direct DC from PV panels into the water heater resistance, no inverter, no grid connection, no permits.
Summary
SolBox is a DC MPPT electronic controller that feeds power directly from photovoltaic panels into the resistance of any electric water heater (100L–500L). It runs stand-alone, no inverter, no grid connection, no installation permits. Manufactured in Thessaloniki, Greece, with a 10-year warranty.
Electrical
| Electrical |
| Input voltage (DC) |
up to 70 V |
| Input from |
PV panels (direct DC, no inverter) |
| Panels supported |
up to 6 units |
| Panel wattage |
400–620 W per panel |
| Total array power |
up to ~3,500 W |
| Output |
DC into water heater resistance |
| MPPT algorithm |
P&O (Perturb & Observe) |
| Idle grid draw |
None, no grid consumption when standing by |
Mechanical
| Mechanical |
| Dimensions (W × D × H) |
14.5 × 9.5 × 14.5 cm |
| Weight |
2.5 kg |
| Enclosure material |
Metal with powder coating |
| Mounting |
Wall-mounted, near the water heater |
| Cooling |
Passive (no fan) |
Water Heater Compatibility
| Boiler |
| Boiler capacity range |
100 L – 500 L |
| Resistance type |
Standard 220V electric resistance (2,000–4,500 W) |
| Equipment replacement |
None, uses your existing water heater |
| Extra plumbing |
None, only electrical connection |
Operational
| Operational |
| Water temperature setpoint |
User-configurable, up to 85°C |
| Two independent setpoints |
Sun + Backup source (e.g. grid) |
| Scheduling |
4 independent 24-hour programs |
| Anti-freeze protection |
Auto-activates < 5°C, cuts off at 8°C |
| Behaviour when no sun |
Water heater keeps working on grid power |
| Cloudy-weather behaviour |
Produces hot water even with ~10W from panels |
Connectivity
| Connectivity |
| WiFi |
2.4 GHz |
| Mobile app |
iOS + Android |
| Remote control |
Setpoints + schedule adjustments |
| Monitoring |
Energy produced, water temperature, statistics |
Installation
| Installation |
| Installation type |
Off-grid, no connection to the electrical grid |
| Permits / net-metering |
None (not a grid-tied system) |
| Installer |
Certified SolBox installer or licensed electrician |
| Installation time |
Typically 3–5 hours |
| Wiring |
DC from panels to SolBox → output to resistance |
Warranty & Lifespan
| Warranty |
| Controller warranty |
10 years |
| Expected service life |
12+ years |
| Panel performance warranty |
20–25 years (from panel manufacturer) |
| Service |
AXINAR, Thessaloniki, Greece |
Manufacturing
| Manufacturing |
| Country of manufacture |
Greece |
| Production site |
Thessaloniki |
| Manufacturer |
AXINAR A.E. |
| Founded |
2010 |
| Manufacturer certifications |
ISO 9001:2015, ISO 14001:2015 |
Ready for SolBox?
The SolBox Configurator calculates exactly what you need in 60 seconds, based on your water heater capacity, household size, and location.
Open the Configurator
