Shunt Charge Controllers
Shunt charge controllers are the go-to solution when you need a durable, low-cost method to protect batteries from overcharge and divert excess solar energy to a load or dump resistor. Shunt controllers are ideal for simple and dependable off-grid systems, designed for easy control of their operating time, as opposed to the more complex MPPT systems. They’re compact, often fanless, and perfect for remote installations and solar water pumping.
Unlike MPPT charge controllers or PWM charge controllers that focus on maximizing harvest from the PV array, shunt charge controllers act as a safety valve that senses battery voltage and reliably shunts excess current to a diversion load controller when the battery reaches a setpoint. That makes them ideal as part of hybrid systems where a Fronius grid-tie inverter handles AC export and grid synchronization because the shunt protects the battery bank and prevents continuous overcharge when other system components change operating modes.
Shunt controllers can be paired neatly with related system parts, such as RV solar charge controllers for mobile installations or monitors & metering, to keep an eye on the state of charge and diversion activity.
Why Choose Our Shunt Charge Controllers?
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Extremely low maintenance and long service life.
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Simple installation and reliable in extreme temperatures.
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Cost-effective for small systems and dedicated diversion loads.
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Ideal partner for hybrid/grid systems.
See Our Complete Collection Range
Quick Spec Comparison
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Product |
Key Attribute 1 |
Key Attribute 2 |
Stand-out Features |
Brand |
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Flexcharge NCHC60-24 |
24V system |
High-current diversion |
Handles large dump loads; durable marine/off-grid design |
Flexcharge |
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Flexcharge PV14-12V 14A |
12V system |
14A max charge current |
Simple, rugged shunt regulation; ideal for small PV systems |
Flexcharge |
|
Flexcharge PV7D 7A 12V Marine/RV |
12V system |
7A max charge current |
Compact, moisture-resistant build for mobile/marine use |
Flexcharge |
|
Flexcharge NC25A 48V Ultra High Efficiency |
48V system |
25A max charge current |
Ultra-low power loss; long-life solid-state design |
Flexcharge |
|
Flexcharge NC30L12DS Charge-Load Controller with LBD |
12V system |
30A max load control |
Integrated load control with low battery disconnect |
Flexcharge |
Other Broader Collections
FAQs
Q: What is a shunt charge controller?
A: A simple regulator that diverts excess solar current away from batteries to prevent overcharge.
Q: When should I pick a shunt controller over MPPT?
A: Choose a shunt when you want simple, reliable diversion (pumps or dump loads) and minimal complexity.
Q: Can shunt controllers work with a grid-tie inverter?
A: Yes. They complement grid-tie inverters by protecting batteries in hybrid setups.
Q: Are shunt controllers suitable for RVs?
A: Yes. Small, rugged shunt regulators are commonly used in mobile/marine systems.
Q: Do shunt controllers need regular maintenance?
A: The basic maintenance requirement is to check diversion loads and wiring periodically.
Why Shop Shunt Charge Controllers at The Solar Store?
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Broad selection of reliable controllers.
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Trusted brands and product images on our site.
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Fast trackable shipping.
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Our support team is available to assist you in-store or online.