Charge Controllers for Solar Panels

Solar Charge Controllers

A solar charge controller sits between your solar panels and your battery bank. It regulates the power coming off the panels so your batteries charge fully without being overcharged, and it stops current from draining back into the panels at night. Krato Power carries MPPT and PWM controllers from 10A to 100A for RVs, cabins, and full off-grid homes, from brands including Rich Solar, SunGoldPower, Renogy, Outback Power, and EG4.

MPPT or PWM?

MPPT controllers convert extra panel voltage into extra charging current, so they harvest more power, handle higher-voltage panel strings, and are the right choice for lithium batteries and most systems over a few hundred watts. PWM controllers cost less and work well on small 12V setups where the panel voltage closely matches the battery, like a single panel on a trailer or boat.

How to size a charge controller

The rule of thumb: total solar watts divided by battery voltage, times 1.25 for a safety margin, gives the minimum amp rating. A 400W array on a 12V battery needs about 42A, so choose a 50A or 60A controller. The same array on a 24V battery needs about 21A, so a 30A controller works. Also confirm your panel string's open-circuit voltage stays under the controller's maximum input voltage, especially on cold mornings.

Controllers by system size

RV, van, boat, and small 12V setups: Rich Solar BRAVO Waterproof PWM controllers from $26.99, and the Rich Solar 20A MPPT at $89.99.
Cabins and mid-size 12V and 24V systems: Rich Solar BRAVO 40, 50, and 60 MPPT controllers from $159.99, the SunGoldPower 60A MPPT at $279, and the Renogy Rover 60A at $399.99.
Off-grid homes and 48V systems: the SunGoldPower 100A MPPT at $495, the EG4 100A 500VDC MPPT at $556.97, the Outback FLEXmax 80 at $698.97, the Renogy Rover 100A at $701.99, and the Outback FLEXmax FM100 at $1,898.97.

Building the rest of the system? See our 48V Server Rack Batteries, 48V Inverters, and complete Solar Panel Kits. Not sure which controller fits? Call our team at 888-855-7286 for free sizing help.

Charge Controller Buying Guides

Start with our guides: MPPT vs PWM charge controllers and what size charge controller you need.

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Rich Solar 30 Amp PWM Solar Charge Controller | 12V/24V Auto 30A PWM Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid

Original Price $45.99

Current Price $39.99

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Features 1. Intelligent Charging System Auto Voltage Detection: Auto-sensing 12V/24V system (manual setup available) Multi-Battery Support: Optim...
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Original Price $45.99

Current Price $39.99

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Rich Solar BRAVO Waterproof 10 | 10 Amp Waterproof PWM Solar Charge Controller | Waterproof 10A 12V PWM Solar Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | #1 Waterproof Solar Controller

Original Price $31.99

Current Price $26.99

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Features PWM technology, switching control by MOSFET Common Positive Grounding connection High efficiency and low power consumption ...
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Original Price $31.99

Current Price $26.99

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Rich Solar BRAVO Waterproof 30 | 30 Amp Waterproof PWM Solar Charge Controller | Waterproof 30A 12V PWM Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | #1 Waterproof Solar Controller

Original Price $45.99

Current Price $39.99

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Features PWM technology, switching control by MOSFET Common Positive Grounding connection High efficiency and low power consumption ...
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Original Price $45.99

Current Price $39.99

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Save $24.00

Rich Solar 40 Amp MPPT Solar Charge Controller

Original Price $183.99

Current Price $159.99

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Features Automatically detects 12V or 24V DC system voltages. Compatible with various deep cycle battery options: Sealed, Gel, Flooded, and Lith...
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Original Price $183.99

Current Price $159.99

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Rich Solar BRAVO 50 | 50 Amp MPPT Solar Charge Controller | Premier 50A 12V/24V MPPT Solar Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | Awarded #1 Solar Controller 2025

Original Price $218.99

Current Price $189.99

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Features True MPPT Tracking Efficiency Above 99.5% Charge Conversion Efficiency as High as 98% 12V / 24V DC System Self-Adaptation Reverse Disch...
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Original Price $218.99

Current Price $189.99

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Save $106.00

Renogy Renogy Rover 100 Amp MPPT Solar Charge Controller

Original Price $807.99

Current Price $701.99

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Renogy Rover 100 Amp MPPT Solar Charge Controller Overview The Renogy Rover 100 Amp MPPT Solar Charge Controller is a powerful and intelligent solu...
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Original Price $807.99

Current Price $701.99

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Save $285.02

Outback Power Outback Power FLEXmax FM100-300VDC-AFCI 100A MPPT Solar Charge Controller

Original Price $2,183.99

Current Price $1,898.97

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Outback Solar FM100 Brings Reliable Backup to Your Cozy HomeOutback Power FLEXmax FM100-300VDC-AFCI 100A MPPT Solar Charge Controller delivers high...
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Original Price $2,183.99

Current Price $1,898.97

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Save $285.02
Save $105.02

Outback Power Outback Power FLEXmax 80 FM80-150VDC MPPT Solar Charge Controller

Original Price $803.99

Current Price $698.97

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Flexmax 80 Brings Reliable Renewable Energy IndoorsOutback Power FLEXmax 80 FM80-150VDC MPPT Solar Charge Controller delivers up to 80 amps of outp...
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Original Price $803.99

Current Price $698.97

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Save $105.02
Save $84.02

EG4 EG4 Solar Charge Controller MPPT 48V 100A 500VDC, 5500W

Original Price $640.99

Current Price $556.97

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EG4 Solar Charge Controller MPPT | 500VDC 100A | MPPT100-48HV The EG4 Solar Charge Controller MPPT100-48HV is a high-efficiency 100A MPPT charge...
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Original Price $640.99

Current Price $556.97

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Save $84.02
Save $14.00

Rich Solar 20 Amp MPPT Solar Charge Controller

Original Price $103.99

Current Price $89.99

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Features Automatically detects 12V or 24V DC system voltages Compatible with various deep cycle battery options: Sealed, Gel, Flooded, and Lithium...
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Original Price $103.99

Current Price $89.99

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Rich Solar BT-1 Module | Bluetooth Module for Solar Charge Controllers | Only for 20/30/40/60A MPPT Models

Original Price $41.99

Current Price $35.99

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Features Wirelessly monitor and control compatible solar charge controllers via Bluetooth Connect to a user-friendly smartphone app, keep ...
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Original Price $41.99

Current Price $35.99

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Rich Solar BRAVO Waterproof 20 | 20 Amp Waterproof PWM Solar Charge Controller | Waterproof 20A 12V PWM Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | #1 Waterproof Solar Controller

Original Price $40.99

Current Price $34.99

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Features PWM technology, switching control by MOSFET Common Positive Grounding connection High efficiency and low power consumption Battery type s...
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Original Price $40.99

Current Price $34.99

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Rich Solar BRAVO 40 | 40 Amp MPPT Solar Charge Controller | Premium 40A 12V/24V MPPT Solar Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | Awarded #1 Solar Controller 2025

Original Price $183.99

Current Price $159.99

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Features MPPT Tracking Efficiency Above 99.5% Charge Conversion Efficiency as high as 98% 12V/24V DC System Self-Adaptation Reverse Discharge ...
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Original Price $183.99

Current Price $159.99

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Save $33.00

Rich Solar BRAVO 60 | 60A MPPT Solar Charge Controller | Premier 60A 12V/24V MPPT Solar Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | Awarded #1 Solar Controller 2025

Original Price $252.99

Current Price $219.99

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Features True MPPT Tracking Efficiency Above 99.5% Charge Conversion Efficiency as High as 98% 12V/24V DC System Self-Adaptation Reverse Discharge...
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Original Price $252.99

Current Price $219.99

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Save $33.00
Save $14.00

Rich Solar 30 Amp PWM Solar Charge Controller | 12V 30A PWM Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | Top Rated

Original Price $103.99

Current Price $89.99

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Features PWM technology, switching control by MOSFET Common positive grounding connection High efficiency and low power consumption Battery type s...
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Original Price $103.99

Current Price $89.99

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Save $14.00
Save $60.00

Renogy Renogy Rover 60 Amp MPPT Solar Charge Controller

Original Price $459.99

Current Price $399.99

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Renogy Rover 60 Amp MPPT Solar Charge Controller Overview The Renogy Rover 60 Amp MPPT Solar Charge Controller is an advanced and reliable solution...
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Original Price $459.99

Current Price $399.99

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Save $45.00

Rich Solar Rich Solar RS-MPPT60 60Amp MPPT Solar Charge Controller

Original Price $344.99

Current Price $299.99

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Rich Solar RS-MPPT60 60Amp MPPT Solar Charge Controller Overview The Rich Solar RS-MPPT60 60Amp MPPT Solar Charge Controller is now available...
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Original Price $344.99

Current Price $299.99

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Magnum Energy Magnum Energy PT100 100 MPPT Solar Charge Controller

Original Price $1,493.99

Current Price $1,298.97

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Magnum PT100 Control Makes Solar Flow Smooth and SimpleMagnum Energy PT100 100 MPPT Solar Charge Controller delivers high efficiency power conversi...
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Original Price $1,493.99

Current Price $1,298.97

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MidNite Solar MidNite Solar Hawke's Bay 120 Pre-Wired System

Original Price $2,815.99

Current Price $2,447.97

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MidNite Solar Hawke's Bay 120 Pre-Wired System Maximize your solar energy potential with the MidNite Solar Hawke's Bay 120 Pre-Wired System, a t...
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Original Price $2,815.99

Current Price $2,447.97

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Rich Solar 30 Amp Flush Mount PWM Solar Charge Controller | 30A 12V/24V PWM Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | Top Rated

Original Price $88.99

Current Price $76.97

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The 30 Amp Flush Mount PWM Solar Charge Controller is a top-rated controller designed to regulate and manage the charging process of your solar pan...
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Original Price $88.99

Current Price $76.97

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Rich Solar 30 Amp MPPT Solar Charge Controller

Original Price $160.99

Current Price $139.99

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Features Automatically detects 12V or 24V DC system voltages. Compatible with various deep cycle battery options: Sealed, Gel, Flooded, an...
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Original Price $160.99

Current Price $139.99

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Rich Solar BRAVO FLUSH 30 | 30 Amp Flush Mount MPPT Solar Charge Controller | Premium 30A 12V/24V MPPT Flush Mount Solar Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | #1 Flush Mount MPPT Solar Controller

Original Price $220.99

Current Price $191.97

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Features PV open circuit voltage up to 100V. The latest Maximum Power Point Tracking (MPPT) algorithm. Unique multiple peaks detected ...
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Original Price $220.99

Current Price $191.97

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Rich Solar BRAVO FLUSH 40 | 40 Amp Flush Mount MPPT Solar Charge Controller | Premium 40A 12V/24V PWM Flush Mount Solar Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | #1 Flush Mount MPPT Solar Controller

Original Price $275.99

Current Price $239.97

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Features PV open circuit voltage up to 100V. The latest Maximum Power Point Tracking (MPPT) algorithm. Unique multiple peaks detected technology f...
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Original Price $275.99

Current Price $239.97

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Rich Solar BRAVO Waterproof 8 | 8 Amp Waterproof PWM Solar Charge Controller | Waterproof 20A 12V PWM Controller for RVs, Trailers, Campers, Vans, Boats, Off-Grid | #1 Waterproof Solar Controller

Original Price $14.99

Current Price $12.97

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Features PWM technology, switching control by MOSFET Common Positive Grounding connection High efficiency and low power consumption Battery type s...
View full details

Original Price $14.99

Current Price $12.97

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Sold out