Solar for Beginners [ask your questions here]
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JRC PGIS (stupid name for a tool) uses "relative to the direction due South", so they take south as being 0 degrees compass bearing (as 0 degrees is the ideal azimuth for solar). That method states the angle from due-South is negative if the sun is East of South and positive if it is West of South. For example, due East would be -90° and due West would be 90°.
That's the easiest way of Northern hemisphere dwellers talking about the variation from the solar-ideal, as you can easily visualise it in your head.
Anywhere which doesn't specifically say "relative to due-South" is using the compass bearing standard of 0 degrees to represent due-North. That works best for Southern hemisphere people as you're only referring to the variation from true North.
it says 44 degrees is north west.. and -156 is south east...
44 degrees on a standard compass is one degree off true-North EAST and not North WEST. But it sounds like they might be using a quadrant compass as that uses the convention of "N44W" to represent "forty-four degrees off North in the Western quadrant", or 315 degrees or North West. For example:
As for the -156 representing SE... that's odd as true SE (off a due-North compass) is 130 degrees. I'm not sure what compass that came off as with Northerly bearings clockwise is typically positive rather than negative.
So the answer is that you'll have to read the info provided about how to calculate the azimuth if they aren't working off 0 to 360 degrees from due North.
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2 hrs will be plenty. On boost it heats at full whack alright. Assuming you have a 3.2Kw element (which seems a little high - usually they are 2.8 to 3.0kw) you could put ~6Kwh into the tank. Doing the math on that Water Heating Calculator (omnicalculator.com)
You won't be able to heat all 120L, but assuming you heat 100liters of it from 20C->60C, that's....
In reality, you might have to go from 25-28C or something similar as you probably may have some left overs from the previous day, but yeah, I'd say your fine.
Me? I'd probably boost it for 1hr every night so that you have some hot water, and then adapt as you see fit. You might find you need more add 15 mins everynight and iterate on that....rather than going the full 2 hrs from the get go and not knowing if your using it all. (unless you are sure you are of course)
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