Does 300W exceed Renogy 20A charge controller (12V battery)

300/12 is 25a and controller says max pv input short current 25a

3 x 100w panels in series would only be ~6A input current
3 x 100w panels in parallel would be ~20A

there are other configurations of 300w

Read the part about max power, something like "Max. Solar Input Power"
ie what controller are we discussing cuz they are different!!!

Way more info is needed to help you....

appreciate all the help i can get

renogy rover 20a with 2 150 watt panels, 200 amp hour 12v battery

Nominal system voltage :12V/24V Auto Recognition

Rated Battery Current :20A

Rated Load Current :20A

Max. PV Input Short Current :25A

Max. Battery Voltage :32V

Max. Solar Input Voltage :100 VDC

Discharge circuit voltage drop :≤ 0.15V

Would this suffice or would I need to go a size up

Here's the problem, the rated input power is limited to 260w spec.
When will 300w produce more than 260w? (very cold blue sky day, sun perpendicular to panel).
From the manual from SRNE, the controller has a current limiting feature which would limit charging to 20A if it ever exceeds this, they do not state how much you can 'over power'. Other mppt controller makers mention how much they can be over powered.

I believe I would not worry and go with the 300w, I would never use 100w panels with a mppt unless I had them, I'd likely be using one 280w 24v panels, or parallel a couple of smaller 24v panels.

srne manual
www.srnesolar.com/index/down/id/84.html

Yes sir 24v is much more efficient... But they don't tell you that when your figuring what system to get...

Most people get the smallest system because it's cheaper and they think they can run anything they want.... But they find out quickly they can't...

Anyway to answer your question... Like Bird said you will more than likely never produce that much voltage but you will need a larger CC to grow your system..

so you've added more info since I responded.

"Max. PV Input Short Current :25A" This means you look on the specs of the panel for short circuit current Isc, wired in parallel you double this value and compare to 25A, in series you will be well below this.

Let me estimate the Isc since it is not given, I'd take 150w / Imp (for a 12v panel, Imp ranges from 17-19v). So I divide 150w/18v and get 8.3A. If I double that for wired in parallel I get <17A which is below 25A. In series you look at the added voltage is less than in your case 100v and it is.

I think I would go with series if your panels are '12v'.

awesome thanks i decided to bump up to the renogy 40a rover after talking to renogy, it is a good idea if i decide to "grow" the system later.

definitely making more sense now

That's awesome... That's what I started with... It's a real nice CC...