Can I install higher nominal power on PV-side of the regulator?  IE will it burn or just flat out charging at maximum rated power?

You can generally install up to 120% of rated power in nominal panel power.

They will indeed "just use what they can handle". The problem is that solar power is intermittent, and battery loads come and go. The control algorithm with typical inexpensive solar chargers is poor, so they tend to overshoot and undershoot their target current. That means that the battery and even the inverter can be damaged if you use too much "overclocking" of PV input.

On 2023/07/11 at 1:53 PM, Ulltand said:

Can I install higher nominal power on PV-side of the regulator?  IE will it burn or just flat out charging at maximum rated power?

Over paneling is done often. The inverter will only take as much PV as it can. Ie a 8kw inverter won't use 12kw of PV. But in poor weather you will benefit. 

Very important though. Do not exceed the mppt max Voc

Edited July 15, 20232 yr by Chris_S

Same as a battery. You can hook up a monster battery. But if the load is only 500W that battery will only feed 500W. You are limited by your inverter being able to demand that load. 

However, in bad cloudy weather an oversized PV Array can be a very good thing. More panels more surface area to catch the sun. Means more potential power from the poor light. 

One golden rule as @Chris_Shas touched on: Do not go above the Voc, that can hurt an MPPT badly. The MPPT can regulate a few variables like Amperage based on its ability to create power. However, Voc is something that is measured directly in an open circuit string of panels. The MPPT cannot regulate this as it's a fixed variable that causes damage if it's above the limits of its rated operation.