Amen to that. It doesn't make sense to spend inordinate time agonizing over
the right ratio, and consumers are skeptical anyway. Unless it's way under
or over 1.0 it isn't going to make a huge difference. I did a sensitivity
analysis on this when PV cost twice as much, and I found it still wasn't
We find it can be very difficult (time consuming) to explain this to some
customers. So we try to keep possibility of clipping to a minimum, maybe with
obvious clipping occurring a few days a year. If module tilt or orientation is
less than ideal, clipping is more rare and we might be more
Mike,
Have you read the Enphase white paper on module to inverter size? It goes
into good detail on why they do it.
http://www2.enphase.com/global/files/Enphase_White_Paper_Module_Rightsizing.pdf
Thanks,
Will
--
*Will White*
Curriculum Developer
e: w...@solarenergy.org
w:
This has been addressed several times on the list (check the archives). But
the best source on this still in my opinion is Enphase's Module
Right-Sizing white paper. There are regional variations that make a big
difference.
It's not so much about the inverter efficiency. It's about how much extra
Recently I've been concerned about power clipping of micro inverters and the
design ratio of PV STC array size to inverter. If I have a 300W module
going into a 250W micro inverter, there will be times when the potential
power output is clipped because the micro inverter can't handle all the
Yes, Southwest Florida. You're right about the availability of modules.
People look at me like I have three heads when I tell them a 185W and a
250W module are about the same price, but that's the world we're living in.
We always need to consider price efficiency in addition the the electrical
and
Hi Jesse and Wrenches,
One thing that should be understood about the production readings from a DC
optimizer system is that the module level readings are in DC. That is the
production before being converted to AC, and does not account for the
losses of the inverter. It isn't really an apples to
Understood. I guess the point/question was, a 250W module with a 215W micro
would flat top a heck of a lot of power where I live during the 6 months of
winter we have. I've sized my system to account for increased production during
this time. I guess it comes down to sizing. I find it hard to
We now have 230W, 235W, 240W, 245W, and 250W modules on Enphase M215's in
the field. Initial anecdotal evidence shows that the 250W modules are doing
better in our area, even when the cost comparison is taken into account
(normalized for $/watt). I don't have a full year of data yet, but I plan
to
Interesting. Jason you're in FLA right? I'd like to hear from a northern
installer who's put in a similar group of enphase. That's exactly the type of
info I'm looking for. Like you mention, this might all be a waste if time when
you consider module price. I'm having a hard time getting
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