6kW system in Agoura Hills

[sensij]

9500 kWh from a 6 kW array is a much better estimate than 14000 kWH, or 10000 kWh from a 4.8 kW array. Panel orientation will have an impact with respect to value in a TOU plan, but the SCE TOU-D-A plan still pays generously for production off-peak (8am - 2pm, and 8 pm-10pm, which doesn't matter), so even the SE panels will probably generate more value in TOU for EV drivers than they will in the straight tier plan.

Does that price include a main service panel upgrade? If so, it is slightly on the high side, but still pretty good. If it does not, you might want to shop it around a bit more.

[gvl]

Why just 9500 KWh? Maybe pvwatt is a little pessimistic. I'm hoping to get 10K KWh/year with my 4.8K system. If you have no shades, try "premium" and "0%" loss.

0% loss? Sounds a bit optimistic for the imperfect world we live in I scaled the losses down to 6% and selected premium, which brought me up to 10500 kWh, unfortunately it doesn't change the fact I have limited SW roof area that is affected by shading.

[thejq]

Ok, you're right my estimate was too naive, however scaling down the numbers in your example to the estimated 9500 kWh of total annual production from a 6kW array per PVWatts for the SW facing roof installation and further by 1/2 because I can only fit 3kW there we arrive at roughly $300 a year difference with no usage that includes my original $150, which is about what I will be spending on trimming of my neighbor trees to reduce shading on the SW segment if I'm lucky he agrees to it. Still not worth doing it in my book.

Why just 9500 KWh? Maybe pvwatt is a little pessimistic. I'm hoping to get 10K KWh/year with my 4.8K system. If you have no shades, try "premium" and "0%" loss.

[gvl]

Ok, you're right my estimate was too naive, however scaling down the numbers in your example to the estimated 9500 kWh of total annual production from a 6kW array per PVWatts for the SW facing roof installation and further by 1/2 because I can only fit 3kW there we arrive at roughly $300 a year difference with no usage that includes my original $150, which is about what I will be spending on trimming of my neighbor trees to reduce shading on the SW segment if I'm lucky he agrees to it. Still not worth doing it in my book.

[thejq]

I have some small SW facing roof over the garage, probably good for 10 panels at most with some shading late in the day. I realize that the SE facing roof is not ideal, especially with the recent TOU on-peak window changes from SCE. However PVWatts tells me that even if I could fit all 6kW on that SW section my annual production would only grow by 327kWh, so in an ideal case scenario when all that extra energy is produced at the highest on-peak rate of 46c/kWh with no consumption it would save me 150 bucks a year, in reality I can only put a limited number of panels there which will also complicate the installation and likely increase the up-front cost I don't feel like it is really worth it not to mention this is a street-facing slope so while I personally couldn't care less about the aesthetics the looks of the street-facing panels may turn off some buyers should I decide to sell my home.

While I can't comment on what it will do to your property value, but your calculation is a little off. When you change the orientation not only you get more production, but your entire bell curve will move from peaking in the morning to afternoon. Just for example you 6K system's annual production is 14000 KWh of which 9000 is produced in the summer (highest TOU pay out). For east facing, let's say 1/5 of the production is after 2PM and for SW it's 1/2 (my SW peaks around 1:45-2:15 PM in the summer). So for the summer, the difference is roughly 9000*1/2*(.46+.30) - 9000*(1/5*.46+4/5*.3) = $432 on top of the $150 you already calculated. But of course, it didn't account for usage during the day. So just scale down the previous number by the % of usage. It's just a rough estimate, you need to go through it again with your bell curves.

[gvl]

I have some small SW facing roof over the garage, probably good for 10 panels at most with some shading late in the day. I realize that the SE facing roof is not ideal, especially with the recent TOU on-peak window changes from SCE. However PVWatts tells me that even if I could fit all 6kW on that SW section my annual production would only grow by 327kWh, so in an ideal case scenario when all that extra energy is produced at the highest on-peak rate of 46c/kWh with no consumption it would save me 150 bucks a year, in reality I can only put a limited number of panels there which will also complicate the installation and likely increase the up-front cost I don't feel like it is really worth it not to mention this is a street-facing slope so while I personally couldn't care less about the aesthetics the looks of the street-facing panels may turn off some buyers should I decide to sell my home.

[thejq]

Any way you can put it on a south, south west or even a west facing roof? That south east roof will "kill" your production, especially considering you have an EV and probably on some EV-TOU plan that pays the most in the afternoon. Not sure about pricing in Agoura Hills but sounds a little higher than San Diego.

[gvl]

New user here. Looks like I'm ready to finally pull the trigger on solar this year. SCE territory, South-East facing roof at 130-degree azimuth, lots of room, no shading. My installer whom I generally trust is initially quoting me $3.95/watt DC on a 20-panel turn-key system using LG300N1C panels and Enphase M250 inverters. Is this a more or less reasonable price for a straightforward install on a roof with asphalt shingles? Should I look into using a string inverter and lower-efficiency panels to reduce up-front costs? I have an EV and not excluding a possibility of adding a second one, so being able to increase the size of the array in the future is somewhat a concern.