Model: MT1550-EU

15 Amp MPPT Solar Charge Controller

Name: 15 Amp MPPT Solar Charge Controller
Brand: Sapphire Energy
Price: 59.95 CAD
Availability: InStock

$59.95 CAD

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MT1550-EU MPPT Charge Controller — Compact Power for Off-Grid Living
The MT1550-EU is the perfect starting point for light-duty off-grid systems. With support for up to 200 W of solar, it keeps your 12 V LiFePO₄ or lead-acid batteries charged safely and efficiently.

Compact and reliable, it includes a built-in LCD, dual USB charging, and programmable load control—ideal for vans, RVs, cabins, sheds, and emergency backup power.

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Overview

The MT1550-EU is a compact 15 A MPPT solar charge controller for small 12 V off-grid systems. With support for up to 200–220 W of solar input, it’s a natural fit for builds using two 100 W panels or a single 220 W Lumera panel. Despite its size, it delivers professional-grade maximum power point tracking so you get more energy from the same roof space.

Did you know? Switching from PWM to MPPT can boost usable energy by up to ~30%—a big win for vans, RVs, cabins, and sheds where panel space is limited.

Efficient Charging Technology

Lumiax’s advanced MPPT algorithm continuously aligns panel output with battery needs, maximizing charge current into your bank. It’s tuned for modern LiFePO₄ batteries and equally compatible with AGM, Gel, and Flooded types. Multi-stage regulation (bulk, boost, equalization, float) supports healthy battery chemistry and long service life.

Result: faster charging, better energy harvest in variable conditions, and stable performance through temperature swings.

User-Friendly Design

A built-in LCD provides clear, real-time status without extra hardware. Dual USB ports make it easy to top up phones and small devices. The programmable load output supports multiple modes (always-on, dusk-to-dawn, user-defined) for lighting, pumps, or auxiliary circuits—handy control without a separate timer.

A popular pairing: two 100 W panels and a 100 Ah LiFePO₄ battery—enough to keep a fridge running, lights on, and devices charged for typical van/RV days.

Built for Reliability

Designed for long-term off-grid use with low self-consumption (~0.2 W), the MT1550-EU includes protections for over-voltage, short-circuit, reverse polarity, and temperature-related charging. Its IP32 enclosure and common-negative design simplify installation. Rugged terminals (up to 8 AWG / 10 mm²) ensure secure, low-loss connections.

Who It’s For

Ideal for mobile and light-duty off-grid power: van builds, overlanding rigs, RVs, backyard sheds, tiny cabins, boats, or emergency backup kits. It also works well for other small systems such as gate controllers, remote security cameras or communication gear where dependable solar charging is required.

If your energy needs grow, it’s easy to step up to a higher-capacity controller later. For compact systems, the MT1550-EU brings efficiency, safety, and simplicity together in one affordable package.

Applications

With support for up to 200–220 W of solar input, the MT1550-EU is an ideal controller for compact systems where efficiency and reliability matter most. It pairs perfectly with 2 × 100 W solar panels or a single 220 W Lumera panel, making it a great fit for small off-grid builds.

Van Life / Camper Vans — run a 12 V fridge, lights, and keep phones and laptops charged
Overlanding & Car Camping — portable solar kit for coolers, radios, and night lighting
Backyard Sheds & Workshops — power lights, chargers, Wi-Fi, or security cameras
Tiny Cabins & Off-Grid Retreats — light-duty power for essentials
Boats & Marine — keep batteries topped up for pumps, navigation, and electronics
Emergency Backup — small solar + battery kit to cover outages and keep devices online
Hunting / Fishing Shacks — reliable power for lighting and communication gear
Gate Controllers — stable charging through all seasons to keep your gate working
Remote Security Cameras — solar power for IP/PoE cameras and an LTE/5G router at gates, farms, and construction sites

Performance in Real-World Setups

The MT1550-EU shines in smaller installations where every watt of solar matters. Its high-efficiency MPPT algorithm ensures that even with just two 100 W panels or a single 220 W Lumera panel, you capture as much energy as possible to keep your batteries healthy and your devices running.

Whether you’re powering a camper van on the road, setting up an RV for weekend trips, outfitting a backyard shed, or keeping a cabin ready for off-grid living, this controller delivers steady, reliable performance without unnecessary bulk or cost. It’s a straightforward solution designed for people who want dependable solar charging in a compact package.

The same qualities that make it great for mobile and off-grid lifestyles also make it useful for other light-duty applications, such as small marine systems, hunting or fishing shacks, or even running remote security cameras and communication gear. And if your energy needs grow, it’s easy to upgrade to a larger controller with more capacity later on.

The MT1550-EU is the perfect starting point for light-duty off-grid systems, combining portability, affordability, and trustworthiness.

Van with solar setup powered by MT1550-EU

Ideal for van life and compact off-grid systems

Key Features

>99.9% MPPT tracking efficiency for maximum solar harvest
Optimized charging profiles for LiFePO₄, AGM, Gel, and Flooded batteries
Integrated LCD display for real-time status and setup
Dual USB outputs for phones, tablets, and small electronics
Programmable load output with multiple control modes
Supports external temperature sensor for precise charging
Low self-consumption design with IP-rated protection

Performance You Can Trust

Lumiax’s MPPT charge controllers are engineered to deliver consistent, reliable power management for your solar system. By continuously tracking the optimal voltage and current point of your panels, these controllers can boost charging efficiency by up to 30% compared to traditional PWM models — meaning more usable energy every day, even in cloudy or shaded conditions.

Designed with modern LiFePO₄ batteries in mind, but fully compatible with AGM, Gel, and Flooded options, the MT series ensures safe multi-stage charging that maximizes performance and extends battery life. Built-in protections guard against over-voltage, short-circuit, and reverse polarity, giving you peace of mind in every installation.

With practical touches like an LCD display, dual USB ports, programmable load output, and support for a remote temperature sensor, Lumiax makes advanced solar charging simple. Whether you’re powering an RV, van build, small cabin, or off-grid system, these controllers combine efficiency, safety, and user-friendly design into one compact unit.

Technical Specifications — MT1550-EU

System
System Voltage	12 V (fixed)
Max Charging Current	15 A
Battery Types	Gel, AGM, Liquid, LiFePO₄, Lithium (programmable)
Grounding	Common Negative
Solar PV Input
Max PV Input Power	200 W
Max PV Voltage (Voc)	35 V (at min ambient temp)
MPPT Tracking Range	(Battery V + 1.0 V) → 0.9 × Voc
Charging Performance
MPPT Tracking Efficiency	> 99.9 %
Charge Conversion Efficiency	≈ 97.5 %
Lead-acid Voltages @25 °C	Boost 14.5 V · Equalize 14.8 V · Float 13.7 V
Protections (Lead-acid)	Over-charge 15.5 V · LVD 10.8–11.8 V (default 11.2 V)
Temp Compensation	–4.17 mV/K/cell (Boost/Equalize); –3.33 mV/K/cell (Float)
Lithium (Programmable)	Target 10.0–17.0 V (default 14.4 V) Low Volt Disc. 9.0–15.0 V (default 10.6 V)
Outputs & Interface
Load Output	15 A max; modes: Always-on / Street-lamp / User
USB	2 × USB, 5 V up to 2 A total (1.5 A single); disabled in LVD
Display	LCD
Communication	None
Remote Temperature Sensor	Supported (external probe port)
Physical & Environmental
Dimensions / Weight	189 × 96 × 53 mm · 420 g
Terminals	Power terminals 8 AWG (10 mm²)
Protection Degree	IP32
Self-Consumption	~ 0.2 W
Operating Temp	–20 °C → +55 °C (storage –25 °C → +80 °C)
Humidity / Altitude	0–100 % RH · up to 4000 m

Solar FAQ

About Solar Charge Controllers

What does a solar charge controller do?

A solar charge controller acts as the “brain” between your solar panels and your batteries. It prevents overcharging, regulates voltage, and ensures your battery bank charges in a safe, controlled way. Without one, solar panels could damage a battery by pushing in unregulated power. At Sapphire, all our controllers are chosen to match our LiFePO₄ batteries perfectly, so you get maximum performance and lifespan.

What is the difference between MPPT and PWM?

PWM (Pulse Width Modulation) controllers are simple and affordable but less efficient, often wasting potential solar energy. MPPT (Maximum Power Point Tracking) controllers adjust continuously to pull the most power possible, boosting efficiency by up to 30%. If roof or panel space is limited—as in vans and cabins—MPPT is almost always worth it. See our blog posts for deeper dives into MPPT vs PWM.

How do I size a solar charge controller?

Controller sizing is based on both amps and voltage. Multiply your solar panel wattage by your system voltage to find the max current, then add a 20–25% safety margin. For example, a 220W panel on a 12V system produces ~18A, so a 20–30A controller is recommended. Sapphire’s MPPT controllers are rated with these margins in mind, making it easy to pair with panels from our Solar Panel Collection.

Can I use a solar charge controller with LiFePO₄ batteries?

Yes—modern controllers include lithium profiles. LiFePO₄ requires precise voltage regulation, and an MPPT controller with a lithium setting ensures safe charging. All Sapphire controllers are tested with our 12V and 24V LiFePO₄ batteries for guaranteed compatibility.

How much solar can I connect to my controller?

Each controller has a maximum wattage and voltage input. For example, a 20A MPPT at 12V can typically handle up to 260W of solar. Oversizing is fine—the controller will “clip” excess power—but never exceed its voltage rating. Sapphire stocks controllers from 15A up to 40A to fit van builds, cabins, and larger installs.

Do I need an inverter with a solar charge controller?

The controller manages DC charging only. To power AC appliances like microwaves, laptops, or TVs, you’ll need an inverter. Many Sapphire customers pair our LiFePO₄ batteries, an MPPT controller, and a pure sine inverter for a complete off-grid system.

Can I mix different solar panels with one controller?

It’s possible but not recommended. Panels of different wattages/voltages drag each other down, reducing efficiency. Best practice is matched panels, such as the 220W Sapphire panels which pair well with our controllers.

What protections are built into solar charge controllers?

Modern controllers protect against over-voltage, reverse polarity, short circuits, overheating, and low-voltage disconnect. Sapphire MPPT controllers include all of these by default, protecting both your batteries and your investment.

Are solar charge controllers waterproof?

Most are IP20–IP32 rated, which means dust and light splash resistant but not waterproof. For outdoor panels, mount the controller indoors or inside a sealed electrical box. Check our accessories for weatherproof solutions.

What accessories should I use with my controller?

Always use properly sized fuses, breakers, and disconnects. A remote temperature sensor improves charging accuracy in extreme climates. Sapphire offers disconnect switches and accessories designed to work with our batteries and controllers.

How long does a solar charge controller last?

A quality controller can last 5–10 years or longer. Install it in a cool, ventilated area for best performance. Sapphire’s MPPT units are designed for long-term reliability to match the service life of our LiFePO₄ batteries.

What are common applications?

Controllers are used in van builds, RVs, cabins, boats, tiny homes, and backup kits. They’re also great for specialized uses like powering security cameras or farm gates. See real examples on our Resources Blog.

About Solar Panels

What size solar panel do I need?

Size depends on your daily energy usage and sun hours. A van fridge and lights often need ~200W, while cabins may need 400W+. Start with your battery size—our 100Ah LiFePO₄ works well with 200–220W of panels—and scale up from there.

Can I connect multiple solar panels together?

Yes. Panels can be wired in series (higher voltage) or parallel (higher amps). Your controller must support the total voltage and current. Our 220W Sapphire panels are easy to pair in either configuration.

What happens if I oversize or undersize my solar array?

Oversizing wastes excess solar as the controller clips output, but it can give you more energy in low-light conditions. Undersizing may leave batteries undercharged. For balance, size your array to your actual daily loads. See our solar sizing guide.

What is the difference between monocrystalline and polycrystalline panels?

Monocrystalline panels are more efficient and take less roof space, while polycrystalline panels are slightly cheaper. Both are reliable, but we recommend mono panels like our 220W modules for compact builds where space matters.

Do solar panels work in cloudy weather or winter?

Yes—panels produce power in diffuse light, though output is reduced. Expect 10–40% of rated power on cloudy days and less in short winter daylight hours. MPPT controllers help maximize energy even in sub-optimal conditions.

How long do solar panels last?

Most panels carry 20–25 year performance warranties. They degrade slowly—typically ~0.5% per year—and continue producing well beyond the warranty period. A good investment for long-term off-grid power.

Are solar panels waterproof and durable?

Yes. Quality panels use tempered glass and aluminum frames tested for hail, snow, and heavy rain. All panels we carry are built for Canadian weather conditions.

What maintenance do solar panels need?

Very little. Occasionally rinse off dust, pollen, or snow to restore efficiency. Inspect mounting and cabling once or twice a year. Panels are designed to be low-maintenance for decades of service.

Can I install solar panels myself?

Many vanlifers and cabin owners DIY their installs. Panels are relatively simple to mount, especially with plug-and-play wiring kits. For rooftops or high-voltage systems, a licensed installer is recommended for safety and compliance.

What angle or direction should solar panels face?

In Canada and the northern US, panels perform best facing south at a tilt close to your latitude. Flat mounting on vans and RVs works too, but expect lower winter performance. Tilting mounts can boost output in seasonal setups like cabins.

Buying & System Design

How do I calculate how much solar I need?

Add up your daily watt-hour usage (appliances × hours), divide by average sun hours, and size your array accordingly. Example: 1000Wh daily use ÷ 4h sun = 250W panels minimum. For help, see our off-grid solar sizing guide.

What size battery bank should I pair with my solar panels?

It depends on your loads and how many days of backup you want. For example, 200Ah at 12V provides ~2.4kWh usable with LiFePO₄. Our 100Ah and 200Ah Sapphire batteries are popular choices for vans and cabins.

Do I need both a solar charge controller and an inverter?

Yes. The controller manages charging, while the inverter converts DC to AC so you can run household devices. Many off-grid systems use all three: solar panels + MPPT controller + Sapphire LiFePO₄ battery + inverter.

What safety equipment do I need for a solar setup?

Always include fuses or breakers, disconnect switches, and proper gauge cabling. Sapphire carries battery disconnect switches and accessories tested to handle high current safely.

Can solar power run my entire house or RV?

Yes, if sized appropriately. Small systems can handle lights and USB charging, while larger arrays with multiple 300Ah batteries can support appliances and full-time living. Many Sapphire customers start small and scale up as their needs grow.

What solar setup is best for vans, cabins, or sheds?

Vans: 200–400W panels + 100–200Ah LiFePO₄ battery. Cabins: 400–1000W panels + 200–600Ah battery. Sheds: 100–400W with 50–200Ah battery depending on usage. See our application guides for tailored recommendations.

Sapphire Energy 100 Ah Lithium Battery On A Concrete Pad with Grass

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15 Amp MPPT Solar Charge Controller