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When do I need a charge controller and why?

The safest way to figure out if you need a charge controller is to take Battery Amp Hour Capacity and divide this by the Solar Panel max. power amp rating. If the quotient is above 200, you don't need a controller. If the number is less than 200 than you need a controller.

For example if you have a 100 amp hour battery and a 10 watt panel, you take 100 and divide it by .6 (600mA) and you get 166.6. Since this is less than 200 you need a charge controller. If you have a five-watt panel in the above example you take 100 divided by .3 (300mA) and you come up with 333.3. Since this is larger than 200 you do not need a charge controller. However you still need a blocking diode, to prevent the battery from discharging to the panel at night. So as a general rule of thumb you don't need a charge controller unless you have more than five watts of solar for every 100-amp hours of battery capacity.

PRE-PACKAGED SOLAR POWER SYSTEMS Grid-Tie Systems, Off-Grid Systems, 5-110 Watt Kits, Power Ready Systems, RV & Marine Kits, Solar Sign Lighting, Portable Solar Power, Sunwize Systems
SOLAR PANELS Matrix, BP, GE, Sharp, Shell, Sanyo, More»	CONTROLLERS Morningstar, Blue Sky, Outback, SCI, Xantrex, More»
BATTERIES Universal, Gel, AGM, Concorde, Surette, More»	INVERTERS SMA, Outback, Xantrex DR, Fronius, Heart, Morningstar, More»
MOUNTS Unirac, Roof & Ground, Sunwize, Top, Side, More»	WIRING Inter-Module, Output, Con to Bat, Inverter, Battery, More»
WIND & PUMPS Southwest, Towers, DC Pumps, More»	SPECIALS 5W-110W Kits, Shell, GE, Uni-Solar 64, PhotoWatt, More»

We Offer The Highest Quality Solar Power Product Components Anywhere.

Welcome to MrSolar.com, the website of Online Solar, Inc., with offices in Maryland, Texas, and California. We ship from distribution centers in New York, Texas, and California. We offer a wide variety of solar panels, solar charge controllers, DC to AC Inverters, batteries, enclosures, cable and wiring and more. We specialize in industrial solar power applications such as solar telecommunications, solar RTU/SCADA, and oil and gas pipeline data monitoring. We have several types of pre-packaged solar power system kits inlcuding grid-tied solar power systems, off-grid solar energy systems, 5-110 watt kits, power ready systems, RV & marine kits, solar sign lighting kits, powerable solar power, and complete Sunwize grid tie systems. Click on any of the links on this page to find more information on our solar energy system products and components.

Thank you for visiting MrSolar.com! We know solar panels!

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Online Solar, Inc.
PO Box: 1506
Cockeysville, MD 21030
Ph: 410-308-1599

Damaged Goods - Please be sure to inspect products for damage within 24 hours of receiving them.