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

Or if you already have a charge controller and thinking about adding some more solar panels or about buying a charge controller for your solar panels

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

20 amp charge controller input power reading from my 200W solar panel

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

Charge controller size (Amp)How many watts can handle @12vHow many watts can handle @24vHow many watts can handle @48v
5 amp60 watts120 watts240 watts
10 amp120 watts240 watts480 watts
15 amp180 watts360 watts720 watts
20 amp240 watts480 watts960 watts
30 amp360 watts720 watts1440 watts
40 amp480 watts960 watts1920 watts
50 amp600 watts1200 watts2400 watts
60 amp720 watts1440 watts2880 watts
70 amp840 watts1680 watts3360 watts
80 amp690 watts1920 watts3840 watts
100 amp1200 watts2400 watts4800 watts
Table: How many watts can any size charge controller handle?

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?

Charging my 100Ah battery with Renogy 200W portable solar suitcase and a 20 amp charge controller

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?

Charge controller capacity How many 12v solar panels (W)How many 24v solar panels (W)
10 amp96 watt192 watt
15 amp144 watt288 watt
20 amp192 watt384 watt
30 amp288 watt576 watt
40 amp384 watt768 watt
50 amp480 watt960 watt
60 amp576 watt1152 watt
70 amp672 watt1344 watt
80 amp552 watt1104 watt
100 amp960 watt1920 watt
How Many Solar Panels Can a 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)

I hope this short guide was helpful to you, if you still have any queries don’t hesitate to contact us or leave a comment below.

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I'm an experienced Sales Consultant with a demonstrated history of working in the renewables and environment industry. Skilled in Photography, Customer Service, and Sales.

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