# How Many Watts Can A Charge Controller Handle?

A solar charge controller or regulator is a device that regulates the volts and amps coming from the solar panel to safely charge the battery

So selecting the right size charge controller for solar panels is what makes some folks confused. Because the Charge controller capacity is measured in Amps (A). But the capacity of the solar panels is rated in watts

Whatever the reason is you have come to the right place, with the help of bellow given charts you can figure out how many watts a charge controller can handle

Note! Read the part where I have described " how many solar panels a charge controller can handle " to keep your solar panel system safe

## How to calculate the charge controller watt limit?

To calculate how many watts a charge controller can handle use this formula

Charge controller watt limit = Charge controller capacity (A)*Charge controller input volts (v)

Every capacity charge controller has an input volt mentioned, Some of them will just only accept 12v solar panels or some other ones can handle up to 48 volts

Like this my Renogy 20A MPPT charge controller, it can handle up to 20 amps on 12 and 24-volt solar panel system

For example

Let's assume that you have a 20A charge controller in a 12v solar panel system

`20A*12v = 240 watts `

20A charge controller in a 12v solar panel system

`20*24 = 480 watts `

How many watts can a 20 amp charge controller handle? 20 amp charge controller can maximum handle 240 watts in a 12v solar panel system and 480 watts in a 24-volt solar panel system

## How Many Watts Can Any size Charge Controller Handle? Chart

Use this chart to figure out how many watts any sized charge controller can handle in 12v, 24v, & 48v solar panels system

Conclusion

• 10 amp charge controller can handle up to 120 watts in a 12v solar system
• 30 amp charge controller can handle up to 360 watts in a 12v solar system and 720 watts in a 24v system
• 40 amp charge controller can handle up to 480 watts in a 12v solar system and 960 watts in a 24v system
• 60 amp charge controller can handle up to 720 watts in a 12v solar system and 1440 watts in a 24v system

Note! if you're running DC appliances through the charge controller so make sure that the wattage of your appliance should not exceed the watt limit of the charge controller

Now let's discuss how many watt solar panels " actually " you can connect with the charge controller

## How Many Solar Panels Can a Charge Controller Handle?

A 30A charge controller can handle a maximum of 360-watt solar panels in a 12v solar array and 720 watts of solar panels in a 24v solar array

to calculate the how many solar panels a charge controller can handle, you would need to figure out how many watts your charge controller can handle (with the help of above chart)

Important disclaimer!

These are the maximum watts your solar charge controller can handle but it's always safe to connect 20% less watts of solar panels (to cover up the fluctuations in solar panel's output)

Sometimes your solar panel will produce way more power than its actual watt rating (which will last a couple of seconds) but it's enough to cause any damage to your charge controller, solar panels, or even batteries.

For example:

`360 - 20% or (360*0.8) = 288`

You can " SAFELY " connect up to 280 watts of solar panels with a 30 amp charge controller in a 12v solar array

### Chart - How Many Solar Panels Can Charge Controller Handle?

Conclusion

• 20 amp charge controller can handle up to 12v 192 watts of solar panels (including, leaving an extra 20% watt capacity for safety reasons)
• 40 amp charge controller can handle up to 12v 384 watts of solar panels (including, leaving an extra 20% watt capacity for safety reasons)
• 60 amp charge controller can handle up to 12v 576 watts of solar panels (including, leaving an extra 20% watt capacity for safety reasons)