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Monday, December 22, 2014

BMW i3 Rex Extended Test Drive

BMW i3 ReX Sitting in my garage

So I've been eying the BMW i3 for some time now.  While it's pricey (starting price ~$41-$45k, avg price ~$50k), this car is a game changer.  The addition of the Range Extending engine (Rex) effectively brings the range of this car from ~80 miles to 160 miles using a tiny engine and a 1.9 gallon tank.  That's a pretty good safety net for anyone with range anxiety.  And the engine does not drive the car.  It's sole purpose is to recharge the battery.  Pretty cool stuff, right?   Oh, and its the most efficient car on the road (by EPA MPGe standards).  Sounds right up my alley, right?  Given that I live in a City and most of my driving is city-esq driving, an electric car for me is almost a no-brainer.  If I travel long distances, I can use my wifes car.  Or you can use BMW's exclusive (for i3 owners) flexible mobility car rental where you can use borrow a car for long trips.

Well, when they i3 first came out, they had a special event at my local BMW dealership (Hendrick BMW) where I signed up, brought my dad with me, and we test drove the car.  I did a second test drive about a month ago over Thanksgiving with my dad and brother.  Those 2 test drives were fun and it showed me that there was ample room in the back seat for any tall people and even with the "suicide doors", It was fairly easy to get in and out of and the trunk was small (not surprising there)  Oh yeah, and its fun to drive.  But...I still wasn't sure if it was the car for me.  Why?  Because of the kiddos.  To be clear...I've got 16 month twins.  And for all you parents out there, you know the ability to (a) put a car seat in a car; (b) the ability to get kids stuff in the car and (c) the ability to get kids in and out of the car are 3 of the most important car buying issues. 
View of the kiddos getting strapped into their car seats in the i3

So I really needed to test this car in "Real life".  Not a test drive where I got to go 5 miles around a couple streets.  I needed to really drive this car as if it was mine.  Located in my garage. So I could see if this car would fit in the lives of my 'modern family'.

So when BMW said they were offering 'extended test drives' (aka take the car home for the weekend) I was thrilled.  At first, it wasn't offered in my area.  But when I queried during my 2nd test drive, it was available so I signed up.  The folks at Hendrick BMW are great.  Nice folks and professionals.  I was given a BMW i3 Rex "Mega World" with the Tech and Driving Assist Package in Ionic Silver.  MSRP of ~$50.25k (Lease of ~$400/month).  I picked it up Friday afternoon (after a meeting).  I drove it to work for the day before taking it home. 

The 240v charging station is pretty much a MUST.  It takes 20hrs to charge from empty on 110v.  Or 3 hrs with the 240v. 

So let's talk about my thoughts.  Before I begin, let's note that this review is just based on the issues I wanted to look at via the kiddos.  If you want to read about range, styling, etc.  Go to one of the dozen-plus automotive websites and check those out. 

OK...so when I took the car home, they first thing I wanted to check out where the 'suicide doors'.  These concerned me because I wasn't sure how they would work in the garage.  Would the doors hit the wall making it impossible to get anyone out of the back?  This would be a similar situation in a parking lot.  If you can't get the kids out of the back without trickery, then this is a no-go.  So...I parked the car in the garage and checked it out.  First thing I did was check it out without any modifications.  What I mean by that...I didn't move anything already there.  You'll see from the pic below the door was able to open fine with my bike and bike carrier still on the wall.  Was it easy?  No.  However, those things are a pain even with my Prius.  So no foul there.  And this spring I'm building a storage area under my new deck...where the bikes and such will be relocated. 
i3 with the doors open in my garage
 OK...so that worked. I will say that there was zero door issues after I moved everything.  Oh, it'll be so nice when I get that storage project done. 

View after I removed the bike and carrier.  Lots more room.

Doors opening in a parking lot next to another car.  No problems getting in and out.  The stroller was trickier, but I was still able to do it.

A view of the front door as it opened against my bike.  It does that with my car too.


My sons car seat in the Mazda 5


So the next thing we needed to check was how well we could get the kids in the car seats.  Below is a pic of the the room I have with our Mazda 5.  Not a fair comparison, I know...a 'mini' minivan vs the i3.  But it's just for reference.  Note how much space there is above the car seat.  And this seat moves forward and back so you can fit things in as needed.

So here's the same car seat in the i3. With the front seat down, it was easy to get the car seat into place.  No issues, plenty of room...at least for this 5'6" 140lbs guy.   Once the car seat was installed and I put the drivers seat into position, the car seat was touching.  Uh oh...while this is fine for a person of my stature, anyone taller would be uncomfortable.  I did have my dad (6'2") get in and he can technically fit, albeit not comfortable.  He has the same issue with the car seats installed in his BMW 3-series Diesel wagon. 
Car seat in the i3 with the front seat folded up

Car seat with the front seat in driving position

My daughters infant car seat.  Hitting the passenger front seat.


Next, I wanted to see if I could fit the double-stroller in.  I wasn't going for the super-big jogging stroller...just the 'umbrella' version.  I can barely fit the jogging stroller in the Prius so I knew getting it in here would be impossible.  I already knew putting the stroller in the cargo area was a no-go.  Way too small.  But what about in the foot-area of the backseat?  Well, that worked, but it did involve a lot of shoving.  To get it in, I had to fold the drivers seat up, put in the stroller, and then reposition the seat.  It did fit as the pics below show.  But the wheels were marking up the seat.

Double Umbrella Stroller in the i3

Stroller wheels right up on the seat...marking it up

Plenty of legroom for me.
Next up...can you get the kids in?  Short answer, yes.  Easily:  no.   So...my kiddos right now are small for their age.  My son is in the 1-3 percentile.  My daughter is on her own curve...technically 0.1 percentile.  At 16 months and about 16 lbs, she's still in her infant car seat.  And most infants at 6 months weigh as much as her.  My son is about 20 lbs which means he could still be in his infant car seat too (max ~25 lbs) but he's in a convertible car seat. 

My wife getting my daughter into the car seat.
So, getting the kids into the car seats specifically with the odd doors.  No problem, especially once I got the stuff out of the way in the garage.  Asking my wife how it was getting my daughter in, it was not a problem with the doors and in one respect, a little easier without the middle door pillar. 

View of my wife getting the kids in the car

However, there was one glaring issue.  In order to get the kids in their seats, you almost literally had to hold them out horizontal to get them between the door opening and the car seat before you could place them in.  I couldn't hold a kid and take a pic at the same time (no Google glasses or Go-Pro), so I had to use a surrogate.  Enter blue bunny.  As you'll see below, blue bunny is about the same size as my son.  So from the pics below you can see that its a tight fit.
My son with blue bunny.
A tight fit trying to get blue bunny into the car

Another view with blue bunny
 
Now, if your kid is calm you can do this easy.  Ok, got that image?  Now..clear your mind and  imagine if the kid is having a temper tantrum.  You're never getting that kid into the car seat without bumps and scratches.  Ugh.  How about when they get bigger?  Or maybe you have a 50-percentile kid?  Or for that matter at 100-percentile kid?  Getting the kid in is only going to get harder as they get bigger (taller and heavier).  Now, if you only have 1 kid and could install the car seat in the center area (I'm not sure if you can since there's no official center seat), then maybe this issue goes away.  I'm not sure...if anyone wants to try this out, go for it.  I have 2 kids, so I'm doing what's important to me.

Now, in about 1.5-2 years the car seats will be FWD facing.  In that case, getting the kids in and out should be downright EASY.  Especially with these doors as there will be a ton of room.  The problem here...is that it's 1.5-2 years away for me.  And that's the length of a car lease.  And by 2017, the Tesla Model 3 will be out.  So while I really like this car, it's not going to work for me.  If you have 1 kid and its determined that you can put the car seat in the middle-back, then this car could work for you.  If you can't well...those folks would be in a similar situation as me, unless you want to crawl over the back-seat from the opposite side to get your kid in and out. 

So BMW and other electric car makers...can you make a car that can handle this?  And make it reasonably affordable?   If so, I'd probably be first in line to get your car. Yes a Tesla would probably work for me, but I can't afford $80k.  Heck, even $50k is stretching the budget, although I'd most likely lease the car.  Overall, this BMW is soooo close to meeting all that I'd need. 



Thursday, October 9, 2014

Lots of catching up to do

Wow...has my last post really been since late June?  That just tells you how much time flies when you have kids.  And work.  And life.  Yada Yada Yada...

Well, let me me catch you up on what's been going down.  Overall, I haven't done much of anything on the home energy efficiency front.  I've just let the solar panels and my HVAC thriftiness take that over.  We did tear down and install a new deck and screened in porch.  When doing that I removed an old door in my living room and replaced it with a window.  When I replaced that door with the window, I made sure I caulked and foamed it up very well around the new frame.  I insulated with some extra extruded polystyrene panels effectively putting in R-20.  And the window is low-e too.  I'm hoping that may fix an issue over there where it's always felt cool in the winter.  Only time will tell.

Pic of the Door-to-window replacement in progress.  Pic shows the frame and window installed, the air gap foamed, awaiting insulation.  Of course, kid toys are in the pic.

Below are the results of the last couple months....

June 1 - July 1, 2014
Power Consumed = 613 kWh (2013 = 462 kWh)
Solar Produced = 203 kWh; Tigo broken, TED estimate)
Billing Days = 30
Average Daily Power Consumption = 20.43 kWh/day (vs. 16.50 kWh or 23.8% increase in usage)
Bill= $75.02 (vs $54.62 in 2013)

July 1 - August 1, 2014
Power Consumed = 600 kWh (2013 = 631 kWh)
Solar Produced = 188 kWh
Billing Days = 31
Average Daily Power Consumption = 19.35 kWh/day (vs. 20.35 kWh or 4.9% decrease in usage)
Bill= $73.82 (vs. $70.78 in 2013)

August 1 - September 1, 2014
Power Consumed = 525 kWh (2013 = 771 kWh)
Solar Produced = 198 kWh
Billing Days = 31
Average Daily Power Consumption = 16.94 kWh/day (vs. 23.36 kWh or 27.5% decrease in usage)
Bill=$66.16 vs $84.14 in 2013)

Overall for those 3 months, my usage decreased by about 6.7% versus 2013.  This month I'm trending to be very close to the same as 2013.  Maybe some day when the kids are older I'll be able to set the thermostat back to my old settings.  Unless my wife has something to say about that...



Monday, June 30, 2014

May Energy Consumption Results

The May energy results are in.  They are posted below.  This week I should get my new TIGO gateway installed so once that is complete, I'll start posting better solar production numbers.  Also, my HVAC guys (Panther HVAC) is going to upgrade my upstairs split unit from the Envision series to a 5-series with a desuperheater.  Thus, I'll have the ability to generate hot water regardless of which system is running. Given that my upstairs split system runs 2:1 over the downstairs this should significantly increase the amount of hot water generated. 

May 2013 Duke Energy Bill (May 3 - June 4)
Energy Consumption = 431 kWh
Billing Days = 33
Average Daily Energy Consumption = 13.06 kWh/day
Bill = $50.93

May 2014 Duke Energy Bill (May 1 - June 1)
Energy Consumption = 431 kWh  (483 kWh used minus 118 kWh sent back to grid)
Solar Energy Produced = 233 kWh (TED5000 Estimate)
Billing Days = 31
Average Daily Energy Consumption = 11.77 kWh/day  (9.85% reduction in energy consumption)
Bill = $49.42

Overall, those are some good numbers.  I doubt I'll look positive for next month. The heat we've had lately has certainly increased our AC usage.  It's pretty much been around 90s for the past 2 weeks straight.  Ugh.  Shoot, last month (May) we didn't even use the AC while last month we ran the upstairs system nearly 80hrs which is equivalent to what we typiclly see in June.  Regardless, there's always 'ups and downs' in weather. 

Have a Happy Independence Day! 

Wednesday, May 28, 2014

Tigo Gateway 'fried', Desuperheater for upstairs, heat pump dryer

My Tigo Control Panel

So the guys from Renu Energy (formerly GreenSpring Energy) came by to check out why my Tigo is broken again.  After after 3 hours of work and constantly going from the roof to the attic to my bonus room (where the Tigo control panel is located), they finally gave up.  Essentially they think the Gateway (located on the roof) is 'fried'.  Tigo is going to send a new gateway to me which they'll exchange for my current one so they can try to diagnose what went wrong.  I'll hopefully get the new unit in 1-2 weeks and Tigo will be up and running.  Now, when I say fried...it just means that Tigo isn't transferring the data.  I'm still getting solar power generation, so that's good.  And I think I'm still getting the benefit of of the Tigo, just not the data.  So stay tuned for more info.

OK...next up, desuperheaters.  One thing that's always annoyed me was that my geothermal install only had 1 desuperheater located on my downstairs unit.  And over the summer and swing seasons I always felt that the upstairs unit ran far longer than the downstairs unit for A/C.  Recall...the longer the runtime for A/C, the more hot water is generated from the desuperheater.  Well, i just confirmed this using the Ecobees.  Overall, the upstairs unit runs 2.2x more than the downstairs units when the A/C is running.  Thus, I'm missing out on ~70% of the potential hot water generation.  Bah!  So I'm looking into getting a desuperheater for my upstairs unit.  I've contacted my HVAC guys (Panther HVAC) to see what they recommend as I'm unused if I'd be looking at a WaterFurnace related unit or if I should go with an aftermarket unit (such as the Turbotec Enviro-Pak).  Stay tuned for more info once I get a reply back from Turbotec on their price along with a reply from my HVAC folks.

BTW...for folks that have a normal heat pump or A/C, you can use the Turbotec system to generate hot water too. You don't need a geotrhermal system to do it.  It's just useful to hopefully have your airhandler and your water heater near to each other.

One final thing...I just saw that LG has released the first heat pump dryer in the US.  Hooray!  It's 50-60% more efficient at drying than a conventional dryer.  As of now, my dryer is by far the largest energy consumer in my house.  The only thing bigger is my emergency heat for the geothermal system and that should never run...except well for emergencies, which hasn't happened.  Unfortunately, it's priced at $1,600 (MSRP) so hopefully prices will drop soon.  Not to mention, I don't need a new washer/dryer as I highly doubt there's any ROI unless I have to replace my unit anyway.

Wednesday, May 21, 2014

Feb/March/April Energy Bill. And Tigo broken again...

Hi Folks-

Yes, I've been a bad slacker. The kiddos are crawling now which means they are all over the place.  There's essentially really no such thing as free time anymore.  If you were in the Southeast this year, you'll know that its been pretty dang odd outside.  In April there were times where I needed heat for a couple of days...then I needed A/C for a couple days, and for the rest, I didn't need anything.  At least recently (May) I haven't needed any heat.  I'm trying like hell not to run the A/C and instead opening the windows.  But the humidity keeps creeping up which means eventually I have to give in.  At a minimum, I'm only running the upstairs system.  The downstairs is staying nice and cool.

Anyhow...without further ado...below are the numbers for February, March and April.

February 2013 (Feb 4 - Mar 4)
Energy Consumption:  901 kWh
Number of Billing days:  28
Average daily Consumption:  32.18 kWh/day
Degree Days:  620
Average Daily Usage/Degree Day:  1.45 kwh/DD
Billing Amount:  $91.68

February 2014 (Feb 1 - Mar 1)
Energy Consumption:  919 kWh (estimated)
Solar Generated to Grid:  135 kWh (estimated from TED5000)
Net Energy Consumption:  784 kWh
Number of Billing days:  28
Average daily Consumption:  28.00 kWh/day (13% reduction)
Degree Days: 543
Average Daily Usage/Degree Day:  1.44 kwh/DD
Billing Amount:  $87.91 ($11.75 monthly savings)

****

March 2013 (March 4 - April 2)
Energy Consumption:  737 kWh
Number of Billing days:  29
Average daily Consumption:  25.41 kWh/day
Degree Days:  444
Average Daily Usage/Degree Day:  1.60 kwh/DD
Billing Amount:  $77.46

March 2014 (March 1 - April 1)
Energy Consumption:  1,112 kWh (estimated)
Solar Generated to Grid:  183 kWh (high estimate from TED5000)
Net Energy Consumption:  929 kWh
Number of Billing days:  31
Average daily Consumption:  29.97 kWh/day (17.9% increase in usage)
Degree Days: 456
Average Daily Usage/Degree Day:  1.60 kwh/DD
Billing Amount:  $101.19 ($19.67 increase in cost)  *Rate increase vs 2013

****

April 2013 (April 2 - May 3)
Energy Consumption:  359 kWh
Number of Billing days:  30
Average daily Consumption:  11.97 kWh/day
Degree Days:  161
Average Daily Usage/Degree Day:  1.49 kwh/DD
Billing Amount:  $44.69

April 2014 (April 1 - May 1)
Energy Consumption:  493 kWh
Solar Generated to Grid:  109 kWh
Net Energy Consumption:  385 kWh
Number of Billing days:  30
Average daily Consumption:  12.83 kWh/day (7.24% increase in usage)
Degree Days: 183
Average Daily Usage/Degree Day:  1.97 kwh/DD
Billing Amount:  $51.24 ($11.53 increase in cost)  *Rate increase vs 2013

While February I was able to reduce costs, I got bit in the butt for March and April.  What surprised me was how the HDDs were the same as last year.  It sure didn't feel like it.  In April, I'm in my lowest energy usage period (swing month).  So you can clearly see the 'kid penalty' (those extra loads of laundry, extra dishes, bath-time, etc).  But it's not like it's THAT bad.  I will say that in March, we did get a new freezer for the garage.  It's 3x the size of the old one, but only uses about 50% more energy than the previous.  So this adds an additional 1 kWh/day to my bill roughly.

How are the solar panels doing?  Well so far we're about 124 kWh lower than projected.  One thing that is really annoying is that Tigo is broken again.  I contacted Greenspring already, but I need to follow-up with them so they can come out.  I'm betting its that dang connection coming loose in the attic again.  That's a bad place to have wires spliced together because it has such an extra temperature range (110F --> Teens).  Thus, copper wiring is going to expand/shrink a lot.  

PVWatts SolarEye Expected Actual
Generation DeRate Generation Generation
Month kWh/mo % kWh/mo kWh/mo Notes
1 223 52% 116.0 135   TED5000 estimate.  Tigo broken
2 221 72% 159.1 135   TED5000 estimate.  Tigo broken
3 282 77% 217.1 183   TED5000 estimate.  Tigo broken
4 299 83% 248.2 209   TED5000 estimate.  Tigo broken
5 293 83% 243.2
6 277 82% 227.1
7 273 82% 223.9
8 278 82% 228.0
9 254 82% 208.3
10 270 75% 202.5
11 220 66% 145.2 96.21   Energized Nov 7th.  Fully Operational Nov 11th.
12 205 47% 96.4 99.37  
Total 3095 74.8% 2315
Expected Actual Diff
To Date: 981.9 857.58 124.4                               
 


Thursday, March 13, 2014

FeBRRRuary Bill...

Hi all.  Wow..I gotta say sometimes is takes FOREVER for Duke Energy to get the dang bill out.  For the longest time I've known how much I owe...but they had not produced a bill to show consumption.

Overall between Jan and Feb it was COLD.  A lot colder than I can remember. You'll see below that the HDDs were 1.5x what was last year and 2012.  Yikes!  And the bill reflects it too.  Also note that Duke Energy raise their rates late last year\ too.

Regardless...below are the results:

January 3rd - February 4th, 2013 Bill
Total consumption:  1,050 kWh
Days in billing cycle = 32
Average Daily Consumption = 32.81 kWh/day
Degree days = 606
Consumption per HDD = 1.73 kWh/HDD
Bill = $104.62

January 1st - February 1st, 2014 Bill
Total consumption:  1,438 kWh
Total Solar Generated:  135 kWh (TED5000)
Total Solar back to grid:  29 kWh
Net Consumption:  1,409 kWh
Days in billing cycle = 31
Average Daily Consumption = 45.45 kWh/day (38.52% increase)
Degree days = 906 (149% increase)
Consumption per HDD = 1.56 kWh/HDD (10.24% decrease)
Bill = $145.16

So, while overall we had a huge increase in average daily energy consumption (~39%) compared to last year, factoring in the significantly bitter cold temperatures shows we had an overall 10% reduction in energy usage.

PVWatts SolarEye Expected Actual
Generation DeRate Generation Generation
Month kWh/mo % kWh/mo kWh/mo Notes
1 223 52% 116.0 135 TED5000 estimate
2 221 72% 159.1 135 TED5000 estimate
3 282 77% 217.1
4 299 83% 248.2
5 293 83% 243.2
6 277 82% 227.1
7 273 82% 223.9
8 278 82% 228.0
9 254 82% 208.3
10 270 75% 202.5
11 220 66% 145.2 96.21 Energized Nov 7.  Fully Online Nov 11.
12 205 47% 96.4 99.37
Total 3095 74.8% 2315

Comparing the solar generation to what was expected shows actual generation at 135 kWh while the estimated generation was listed as 116 kWh.  So that's good.  However, in February it looks like I produced less power than what was predicted.  For a combo of Jan&Feb, I produced 270 kWh while it predicted 275 kWh.  A 1.9% error?  I'm OK with that...

FYI, I got January's data from my TED5000 as my Tigo system is not generating data.  The Tigo unit says "No Gateway Detected!".  The contractor will check out the gateway today to figure out what is going on.  Luckily, its not inhibiting me from producing power.

BTW...Tigo makes you PAY to view your own generated data after an apparent "honeymoon" period.   This is very annoying as the Tigo website is very sly and not straightforward that a normal homeowner would have to pay.  It reads as if only large scale systems need to pay since they would need the advanced features.  It's not expensive ($5/year), but it pissed me off regardless.  Also the contractor did not tell me of this either which is doubly annoying.


Wednesday, January 22, 2014

January Bill

Hi All...long time no blog, eh?  Yeah, the kiddos are keeping me busy and there's a bunch of things I'd like to blog about, but I just haven't gotten around to it.  Regardless, I'm back now with the latest energy results.  Shall we begin?

January 2013 Duke Energy Bill
Energy Consumed = 940 kWh
Billing Days = 31
Average Daily Consumption = 30.32 kWh/day
Heating Degree Days = 538
Energy per HDD = 1.75 kWh/HDD
Bill = $95.84

January 2014 Duke Energy Bill (Dec 1 - Jan 1)
Energy Consumed = 1,020 kWh
Solar Energy Back to the Grid = 33 kWh (99.4Next  kWh total generated)
Net Energy Usage = 987 kWh
Billing Days = 31
Average Daily Consumption = 31.84 kWh/day (5% increase in usage)
Heating Degree Days = 577
Energy per HDD = 1.71 kWh/HDD (2.3% reduction in usage)
Bill = $103.55 ($0.13 savings vs 2012 due to the higher rate)

Overall, I used about 5% more energy than 2013.  However, factoring in the colder weather, I was roughly the same with 2.3% reduction.  I'll take that.  I'm even OK with the 5% increase at face value.  Overall, I'd say sticking within 5% error is pretty darn good with the introduction of the twins to the family.  

Next month is ugly, as TED5000 is reporting that I'm averaging 44.7 kWh/day.  I'm sitting at 923 kWh used to date which extrapolates to ~1390 kWh/month.  Yikes!  Mind you much of that is due to the bitter cold we've been experiencing.  In 2013 we had 606 HDD.  We're CURRENTLY at 558 HDDs with 10 more days to go (including today).  And we're averaging 23 HDD/day (already removing the 4 coldest days).  That'll put this month at 788 HDDs!  That would explain the significant increase in usage (HVAC related).  And 1390/788 = 1.76 kWh/HDD which is generally on par with what I've been reporting.   

Thursday, January 2, 2014

Solar Panel Update - How close to expected?


Happy New Year everyone!  Well, now that the new year is upon us and I finally have a full month of data collection, I can look at how well my solar installation has performed compared to what was expected.  Be mindful that this really only 1 month of data.  The true test will be once we get a full year of data.  But I'm gonna show y'all anyway.


First let's get some of the background, shall we?  Below is a pic of what PV Watts estimated my house should get.  This is the same information that my Solar Contractor, Greenspring Energy, gave to me.

PV Watts Information

 The PVWatts information has a big ole' asterisk with it though.  This assumes full, unimpeded access to the sunlight.  Well, my house isn't in the middle of a field, so these numbers are not realistic.  That's where the SunEye report comes in as shown in the pictures below.
Monthly SolarEye Information


As you'll notice, due to shading, I should expect at most, 75% of the unimpeded values with February- October getting the best results (72-83%) and November-January getting significantly lower (47-66%).  December is the worst month with only 47%.

Wait...never seen one of these things?  Well, essentially what they do is take this fisheye camera thingy (yes, "thingy" is a technical term) and put it on multiple points on your roof where it takes a picture and overlays how the sun will track across it.  See the picture below:

SunEye Report for One of my Locations.
In my case they took 3 pictures at the 3 points of the triangle of my southern facing roof.  In the picture above (the peak of the triangle, best location) you can see how the tops of the trees (green) partially inhibit the sunshine from reaching my solar panels.  The evening trees (picture right) are in my backyard and is about a 50/50 mix of trees in my yard and my neighbors yard.  So if I wanted to increase my energy generation, I'd need to get myself a chainsaw.  However, I don't want to do that because those same trees shade my house and keep the temperature down.  I'll take that benefit instead.  If there was one thing I'd do would be to trim some of the those top trees that are significantly reducing Nov/Dec/Jan.  That could be really only 3-4 branches.  In one instance I know there's a tree that's dead on the top (shown in the pic above, the green splotch where the 10am line and Nov line meet) that probably needs to be trimmed or come down soon anyway.

OK...enough of that tangent...so getting back to the discussion, now let's look at my generation (from the Tigo website):

Tigo Energy Recordings
Overall I've produced just shy of 100 kWh/month for November and December.  And don't forget that I'm missing about 6-10 days of data as the system was energized on November 7th and wasn't fully operational until November 11th.  So let's take this data and compare it what was expected:

Comparison of Expected vs Actual Solar Power Generation
As we see for December, I was just over what was expected for the month which is good! If we were to extrapolate November we'd be a little under (say 130 kWh vs 145 kWh), but it's at least in the neighborhood. I'd say "so far so good".  I think what's going to be most interesting is when we get into this Spring.

I'll try to remember to post this similar information for each month in addition to my Duke Energy information.  If I can, I'll try to combine the two when I can.

Any thoughts out there?