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
