Effective Guide to Sizing an RV Solar Charge Controller with Ease

by Sergio Clark
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In sizing an RV solar charge controller, an initial layout has to be made. An individual has to know whether the available controller is a PWM or MPPT controller.

This is because 50% of its formed energy may be lost if an inadequate controller is set.

For those who may not understand the implication of this, you may have heard of the conservation theory which states that energy can not be destroyed or created, but rather, changes form.

A loss of 50% generated power will be detrimental to the ecosystem based on that law.

The basics of RV charge controller sizing

The act of sizing a quality charge controller is a pretty easy task. Most times, the overall size of charge controllers is dependent on the solar system capacity.

A simple tip is this; ‘The charge controller capacity, should be synonymous to the power dispensed by the panel’.

For instance, if a particular system is 13V and 15A, the user would most likely need a solar of 16amps. Nonetheless, due to factors outside of human control, an added 27% amps most be added.

The PWM controller sizing

While observing a charge controller, you have to consider a lot of things. For instance, when you purchase a PWM controller, the available amp is usually written clearly above it.

The amp written above the products tells the buy the product’s capacities. The capacity is a complete representation of the product’s strength.

Before buying a PWM controller, you need to look out for the voltage and amp level.

Steps to voltage and amperage consideration

The first thing you must look out for is the voltage.

Taking a proper look at the voltage in its battery bag will determine its system compatibility. In a standard situation, a 12volts or 24volts battery bag will do just fine. Anything above that may be a sign of incompatibility.

A second fact for consideration, is the current flowing from the battery bag. For instance, if the amperage is rated 30, the standard recommendation is a 1.25 volts system.

Thirdly, a good check on the highest solar input is a step in the right direction. By checking the voltage, the buyer has an idea of how the controller system is to be used.

Then, the next thing to do is a proper analysis on the width, breadth, length and height of the lethal. Proper analysis will lead to current system control and helps the buyer to know the maximum gauge.

Lastly, you need to carefully look at the battery specie.

A consideration of the battery type gives room for battery and charger controller compatibility. It would also encourage a minimal voltage loss routine.


In summary, the battery specie must be compatible with the charger control if power losses are to be minimized. Only then can power reversal and power loss be avoided.

So there’s all you should know about the sizing of an RV solar charge controller. We certainly hope that this will prove helpful in the long run.

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