The Solisto SOL-20-MPPT is a high-efficiency MPPT charge controller
In remote solar power systems, the charge controller determines whether a site operates reliably or struggles during seasonal or load fluctuations.
Solar modules generate energy. Batteries store it. However, the MPPT charge controller manages how efficiently that energy is harvested and protected. In industrial off-grid environments, that control becomes critical.
The Solisto SOL-20-MPPT is a high-efficiency MPPT charge controller designed specifically for remote solar power systems operating in oil and gas fields, environmental monitoring stations, traffic infrastructure, communications sites, and industrial automation deployments.
- If you are designing or maintaining systems similar to those outlined in our
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- Oil & Gas Remote Power Applications:
https://www.sunwize.com/application-item/oil-gas-remote-power/- OR
- Environmental Monitoring Power Systems:
https://www.sunwize.com/solar-applications/environmental-monitoring/
- Oil & Gas Remote Power Applications:
Visit the Solisto Charge Controller Product Page for more information:
Why MPPT Technology Matters in Remote Solar Power Systems
Solar output is dynamic. Irradiance changes throughout the day. Ambient temperature affects voltage. Seasonal sun angles shift available production.
Traditional PWM controllers limit panel output by operating near battery voltage. As a result, usable solar energy is lost. In contrast, MPPT technology continuously tracks the array’s maximum power point and adjusts input voltage in real time.
The SOL-20-MPPT delivers:
- MPPT tracking efficiency greater than 99 percent
- Up to 15 to 20 percent improved energy harvest compared to PWM controllers
- Stable charging performance under changing irradiance and temperature
In remote sites where winter margins are tight and truck rolls are expensive, improved energy harvesting directly translates into improved autonomy.
Flexible Battery Support Across Multiple Chemistries
Remote applications rarely rely on a single battery type, so flexibility is critical. The SOL-20-MPPT supports:
• Flooded, sealed, and gel lead-acid
• Lithium
• User-defined battery profiles
It also automatically detects 12V, 24V, 36V, and 48V systems, simplifying field configuration and reducing installation errors. Temperature compensation is included for lead-acid batteries and appropriately disabled for lithium, allowing one controller platform to support multiple verticals and evolving battery strategies.
See data sheet here: data sheet
Integrated Load Control for Simplified System Design
Unlike many MPPT controllers, the SOL-20-MPPT functions as both a charge controller and a load controller.
Seventeen load operating modes are available, including:
- Pure light control
- Light plus time control
- Manual mode
- Normally on mode
- Debug mode
For lighting systems, remote cameras, traffic monitoring devices, or sensor packages, integrated load control reduces external components and wiring complexity.
When designing compact NEMA enclosures or standardized power packages, fewer components mean fewer failure points.
See user manual here: user manual
Built for Industrial Remote Environments
Remote power systems operate in harsh conditions. Therefore, durability and protection are critical.
The SOL-20-MPPT includes:
- Operating temperature range: -35°C to 65°C
- Maximum PV open circuit voltage: 100V
- Battery voltage range: up to 64V
- IP32 protection rating
- Natural heat dissipation design
Comprehensive protection features include:
- PV over-voltage protection
- Reverse polarity protection
- Over-current and overload protection
- Battery over-voltage and over-discharge protection
- Controller over-temperature protection
- Night reverse current protection
These safeguards help prevent damage caused by installation errors, environmental extremes, or transient conditions.
Visit Product Web Page: web page
Communication and System Visibility
Modern remote solar power systems increasingly require integration with telemetry and SCADA platforms.
The SOL-20-MPPT supports:
- RS485 communication using Modbus protocol
- CAN communication using RV-C protocol
- TTL communication
- Bluetooth connectivity via mobile app
- Remote temperature sensor input
- Up to 200 days of historical data storage
These communication options allow integration into fleet-level monitoring architectures and OEM control platforms.
For connected remote systems similar to our
Security & Surveillance Power Systems:
https://www.sunwize.com/solar-applications/security-surveillance/
communication capability is essential for diagnostics and performance validation.
Technical Specifications Summary
Model: SOL-20-MPPT
Rated Charge Current: 20A
System Voltage: 12V / 24V / 36V / 48V Auto-Detect
Maximum PV Open Circuit Voltage: 100VOC
Maximum Battery Voltage: 64V
Standby Power Draw: ≤ 20mA
MPPT Tracking Efficiency: > 99%
Charging Conversion Efficiency: 85 to 98 percent
Battery Types Supported: Flooded, Sealed, Gel, Lithium, User-Defined
Boost Charge Duration: 2 hours default
Operating Temperature: -35°C to 65°C
IP Rating: IP32
Dimensions: 192 x 113.9 x 59 mm
Weight: 0.76 kg
Warranty: Three Years
Practical Performance for Remote Power Architects
At 20A charging capacity and support for up to 48V systems, the SOL-20-MPPT is well suited for small to mid-sized off-grid power packages, including:
- Pipeline monitoring
- Remote pressure transmitters
- Environmental monitoring stations
- Traffic and transportation systems
- Communications repeaters
- Industrial control panels
- Lighting and signage
With low standby consumption and high tracking efficiency, it preserves battery capacity during low-sun conditions while maximizing harvest during peak production.
In remote solar power systems, reliability is built through intelligent component selection. The charge controller sits at the center of that architecture.
The SOL-20-MPPT delivers efficient energy harvesting, flexible battery management, integrated load control, and industrial-grade protection in a single platform.
Lets Get Started!
Why leave power reliability to chance? If your team needs a field-proven power solution, let’s talk.