Hiya AB,
The Powertech stuff I have seen comes with an onboard reg set for wets and has no other adjustment so not 100% ideal for AGM etc.
Panel specs 'should' be fine unless he has ended up with some weird array somehow.
Not sure about the "open" requirement you mention, that is a tad unusual and can't say as I have seen it before.
Whatever works on an open wet should work equally as well on a low maintenance jobbie 99% of the time
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