Topic

Why do I need a load connection on a charge controller?

I just got a Morningstar Sunlight charge controller. I connected the controller to the PV system and the battery. I also have a 300W inverter directly connected to the battery bank.

I am wondering why we have a "load" connection on the charge controller. Shouldn't I connect my load directly on the battery?

Thanks for your help.

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Comments

Hey Truesolar,

The main purpose of having the load connection on the charge controller is to protect the battery from too much discharge.  For instance, after using the battery for a while it reaches the 50% discharge capacity.  If the load was connected directly to the battery, it would continue to drain the battery thus reducing the battery's lifespan.  If the load was connected to the charge controller, the charge controller would know that the battery is low and therefore disconnect the load to protect the battery.  It is up to you whether or not you want to use the load connection.

For more information you can look at the Morningstar Sunlight user's manual.