PV panels are usually operated as close to being current sources with
the voltage clamped by the load - very often a lead acid battery.

It's also wholly usual to have a rectifier diode but no regulation on
panel - you want a regulator you buy one. The diode is solely to
prevent back current flow into the panel when Vpanel falls below
Vbattery.

22V is enthusiastic - you usally have 36 cells for not vastly over
18V. Load that byabout  20% to near MPP 9max ower point) and you have
V >= Vlead_acid_max.

> Speaking of which, and of manufacturers who are ignorant or just
> don't, really just don't, care, I was given a couple of small panels
> called Sun Maxx. Made by The Chaslyn Company of Springfield.
> Possibly designed by Homer himself. These SC-6A (actually it's
> printed 12A, but the 12 is crossed out and 6 is pencilled in. Classy)
> Battery Chargers are intended, according to the label, for charging
> lead batteries. They have no regulation whatsoever and put out 22V
> on a sunny day. I would not be surprised if there is a Chaslyn Out-
> Of-Court-Settlement-And-Replacement-Battery Company too
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