Forums

Texas Solar Proposal: Good, Bad or Ugly?

Texas Solar Proposal: Good, Bad or Ugly?

Received the following proposal for 7,0000 K/Watt system. Opinions? Good? Bad? Ugly??

8 LG 350 Neon 2
8 Enphase IQ 7 Plus
59 ft. XR - 10 Black (Splices and Clamps)
10 SnapNRack Flashing w/Black Iron Ridge L Foot
1 Bodhi Communications Apps
1 NEC Compliant Electrical Equipment
1 Envoy w/Consumption
Miscellaneous Materials

Materials Total $5,696.39
Labor
Installation Labor
Labor Total $2,385.00
Additional Items
Permitting $350.00
Design and Commissioning $350.00
Lighthouse 25 Year Warranty $0.00
Tesla Powerwall II x 2 + Installation $20,495.50
Lighthouse Summer Promotion -$610.00
Additional Items Total $20,585.50
Totals
Sub Total $28,666.89
Sales Tax $469.95
Out of Pocket Cost $29,136.84
30% Federal Tax Credit -$8,741.05
Final Cost to You ($7.28 / Watt) $20,395.79

Tesla-David | October 9, 2019

Does your cost breakdown of $29,136.84 and after incentives cost of $20,395.79 include your 7 kWh solar + 2 PW'2? If so run with this estimate and do not look back as it is an incredible deal IMHO. I have 13.2 kWh solar system installed in 2012 ($83k) and two PW2's installed in June 2018 ($15.5k), so your absolutely getting a great deal as outlined. We have been exceptionally pleased with our solar + PW2's and have no regrets. BTW our much more costly solar system will be fully paid off this year with the incentives in place in WA State, which will sunset next year. Here, I am paid $0.54 for every kWh I produce and we pay only $0.10/kWh here for electricity, and our utility provider cuts us a check for $5k/year since 2013.

jrweiss98020 | October 9, 2019

My up-front cost for 9 KW PV + 2xPW2 was $55K a couple months ago (Seattle area). Your $29K estimate is VERY good, especially with the IQ7 microinverters. My only comment would be to increase the PV output (more panels) if you have the room.

nwfan | October 10, 2019

I'm in TX. Have a 17kW system using Enphase IQ6+ microinverters.
The price is reasonable for system your considering.
My suggestion is add panels if possible and get installation done prior
to Dec 31, 2019. The Fed 30 % tax credit decreases in 2020 for residential
users.

I increased the number of panels to 45 after purchasing my 2nd Tesla vehicle.
Depending on miles you drive, the Tesla cars do consume kW's.

goliadranger | October 10, 2019

Thanks everyone. I;m gonna call the proposer Monday and get er done!

goliadranger | October 14, 2019

OK. I got a second proposal with the following specs

37 Panasonic Panels
Producing 12.54kW
No battery
Total price: $42,600
25 year Panasonic warrantee

My questions:

1. Is 37 panels and 12.54kW overkill for a 1200sf weekend home?
2. Is $42,600 way too much?

Tesla-David | October 14, 2019

What is your monthly electric usage (kWh)? That should inform you on what sized solar array to consider. We have 2000 sq ft house with 13.2 kWh solar system and 2 PW2 batteries. I oversized our solar before doing energy reduction retrofits to our 1987 home and now produce >300 % more than we need to operate our all-electric home and charge both our Tesla's. We are exporting 60-70 percent of our solar back to grid. Therefore, It would appear to me that a smaller home, 1200 sq ft, you could get by with a much smaller solar array. Yes, $42.6k is more than you probably need especially without the PW2's. I would opt for solar system ~7 kWh with PW2's.

Tesla-David | October 14, 2019

What is your monthly electric usage (kWh)? That should inform you on what sized solar array to consider. We have 2000 sq ft house with 13.2 kWh solar system and 2 PW2 batteries. I oversized our solar before doing energy reduction retrofits to our 1987 home and now produce >300 % more than we need to operate our all-electric home and charge both our Tesla's. We are exporting 60-70 percent of our solar back to grid. Therefore, It would appear to me that a smaller home, 1200 sq ft, you could get by with a much smaller solar array. Yes, $42.6k is more than you probably need especially without the PW2's. I would opt for solar system ~7 kWh with PW2's.

bp | October 15, 2019

The OP is being charged $3.39/KW (pre-rebate) for 37 Panasonic 350W solar panels/installation in TX.

We just had a quote for 44 LG 350W panels at $3.11/KW (pre-rebate) in TX - which includes a premium because the installation will be on a Spanish tile roof.

We have a large home that averages around 120 KWh of power per day (which includes charging for 2 Tesla vehicles and pool pumps). The system we're installing is projected to provide around 44% of our annual energy, which should be enough to run our essential circuits off grid for days during an emergency (hurricane). While that isn't enough to cover all of our energy use, dropping our energy use by 44% should be enough to qualify us for lower electric rates - so we'll not only save on the electricity we're getting from solar - we'll also pay less for the electricity we're getting from the grid.

Since Texas doesn't require utilities to buyback electricity, it's unclear if it makes economic sense to install more solar than you'll use, at least until utilities are required to buyback electricity from consumers in TX.

The best way to determine if the proposed configuration makes sense is to do a financial projection of your system cost vs. the projected electricity costs/savings. For our analysis, we used the rates our utility wants to charge us for the next 2 years (a 30% increase over our current rates), plus 3% increase per year. And then estimate how long it will take for you to "break even" and recover enough from electricity savings to pay off your solar installation.

We included PowerWalls in our configuration - and for the breakeven estimate, we removed $10K from the system cost, about what we would likely pay to get backup power from a gas generator (if we purchased a gas generator, we'd never get any savings from that, and unreasonable to assume backup power with PowerWalls would breakeven from solar savings).

jrweiss98020 | October 15, 2019

I almost overlooked your note on "weekend home"... 12 KW without storage is significant overkill, especially at a cost of $42K. You'll get electricity only in the daylight, for 2 days a week! You'd be MUCH better off with the original setup, since it is likely the fully charged Powerwalls could carry you through the entire weekend even with cloudy days. Of course, you didn't tell us if you're running electric heat and air conditioning and/or recharging cars as well...