Posted By: ringithe resistance of the load need to be much in real time to the generation of the PV panel(s), therefore a converter/interface is needed between the PV and the load

Explain more? Sounds like what you want if anything is a storage battery - an converter/interface (inverter?) seems neither here nor there?

Posted By: fostertomExplain more?

Try running a 3.3 V CPU or a 400 mA LED directly off a 48 V battery for a smoke-filled explanation.

Posted By: fostertomhow can dc be at any frequency?

Dc-to-dc converters work in different ways but essentially they convert to AC, transform and convert back. It's not usually simply a transformer as such (at least in modern devices) but rather some sort of reactor (inductor or capacitor) network working to divide or multiply the voltage.

E.g., modern light-weight wall warts basically ignore the fact that the incoming voltage is AC - they rectify it to high voltage DC then chop it at high frequency (10s of kHz, I think), use an inductor capacitor combination to divide down to the target voltage then rectify that.

The advantage of the high frequencies is that the energy needs to only be stored for a small number of microseconds, rather than multiple milliseconds needed at 50 Hz, so they can be smaller and lighter. So the advantage of staying with DC between devices is not large.

You need to use the same technique if you are reducing DC as well.

Standard linear regulator or resistive dropper will waste about 9 times more energy than is used productively if going from 48V to 5V for example.