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Other than the "buy now" aspect, this doesn't seem any better for calculating solar savings than http://pvwatts.nrel.gov/ http://pvwatts.nrel.gov/ I used PVwatt
by pilom 11y ago
Other than the "buy now" aspect, this doesn't seem any better for calculating solar savings than http://pvwatts.nrel.gov/ http://pvwatts.nrel.gov/ I used PVwatts when sizing my home system in Denver and thought it did a great job.
- Navarr 11y agoIt's "easier." I just logged into PvWatts, knowing practically nothing about solar, and I'm confused at Step 2. There's a billion variables that it wants me to fill out instead of trying to calculate them for me for optimal results.
- gregable 11y agoAgreed PVWatts is more accurate, and it's what a solar installer is actually likely to use when doing a roof assessment. But to use PVWatts you need to input things like the tilt and orientation of your roof, the size of the system you want to build, the cost of power from your provider, inverter efficiency, etc. This asks for your address and your monthly electricity bill to give you a rough estimate, both of which homeowners are much more likely to know.
- thrownaway2424 11y agoHrmm, I don't know, the Google one seems more accurate in the details. It correctly shows my house as being plunged in darkness pretty much all day long (it's near the bottom of a slot canyon) whereas the site you linked above gives some quite rosy and unrealistic projections.