Yep, I have 12 panels with S270s and 24 panels with M250s along with one PW2 installed.
Anyone here that installed the Powerwall with Enphase micro-inverters?
Anyone here that was able to have Tesla properly apply for SGIP "Small residential energy storage" incentives for California residents?
My calculations using the Tesla website is that I could just do with a single PowerWall. Thoughts?
Another consideration is the amount of backup power you'll need/want to cover your overnight
Yes, you can just use one Powerwall if you are OK having circuits with loads 30A and greater excluded from the backup. From what you have stated, it looks like you do not have any loads that are 30A or greater. So you'll be fine.
Another consideration is the amount of backup power you'll need/want to cover your overnight use until solar can charge your batteries the following morning. Is one battery enough given a set reserve level?
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you don't mention the amount of power your household consumes in a day (and night). you can always get one now and add another later if you see the use case. .
Regarding the amount of backup I need. I have 5 years of records at pwoutput.org. My daily consumption average is between 17 and 21 kWh / day. My daily generation is between 7 and 28 kWh / day. If a single Tesla PowerWall holds 13.2 kWh, I should have plenty to keep me going for a full day of utility outage.
The reason I was asking, I don't know if you generate enough to feed the house and re-charge one battery (let alone two). If you can, it would be boarder line from the numbers I'm seeing. From what I've been seeing on this and other forums, the US has some strange regulations... you need to check if you can also charge from the grid during off-peak times if your solar can't re-charge the PW2.
You are grandathered on Net Metering but in 2019 your rate choices will be limited to Time of Use rates. That may change your economics.I am on Net Metering Tier 1, @ 17c / kWh (never been on Tier 2 since I have had solar).
Changing lights to LED, definitely, however, if you changed out multiple tv's, a laptop, refrigerator, washer, and dishwasher just to make them more energy efficient, you are NEVER recouping that cost, EVER, not even 1/4 of it. Estimating that entire cost to be $5,500 conservatively (very conservative) and doubled your yearly SCE to $120 (you won't ever see that) and it will take 45 years to pay for itself. Absolutely replace with those options when needed, however if you did to save energy, you just largely increased your total cost of ownershipAwesome. I have 17 panels of Canadian Solar CS6P 240P Watt PV Modules, with 17 Enphase M215 Microinverter Inter-tie String Inverters. This is a 4,080 Watt Utility Grid Tie System was estimated to generate up to 19.59 kWh per day based on 5.5 hours of sun light. Actual generation has exceeded 28 kWh during the summer. On a cloudy day in SoCAl I still product1-12 KWh. I have replaced all lights with LEDs, all plasma displays with Samsung and Vizio LEDs, and my 2007 Mac Pro (energy guzzler) with a 2013 Mac Pro, refrigerator, washer and dishwasher are all new, energy efficient versions. I do not have A/C, Dryer is gas.
This year I got a check back from SCE of $65, which effectively covers 12 months of fees and taxes. Next year I am expecting a much larger check as I replaced more stuff lately, and I may as well use the extra energy for my wife's Model 3. I am on NET Metering.
My calculations using the Tesla website is that I could just do with a single PowerWall. Thoughts?
Changing lights to LED, definitely, however, if you changed out multiple tv's, a laptop, refrigerator, washer, and dishwasher just to make them more energy efficient, you are NEVER recouping that cost, EVER, not even 1/4 of it. Estimating that entire cost to be $5,500 conservatively (very conservative) and doubled your yearly SCE to $120 (you won't ever see that) and it will take 45 years to pay for itself. Absolutely replace with those options when needed, however if you did to save energy, you just largely increased your total cost of ownership
With Net Metering I can charge from the grid at ANY hours. During the day I push energy to the grid and pull from the grid at night. In LA with SCE we do not yet have to pick Time-of-Day pricing, with off-peak and on-peak times. I am on Net Metering Tier 1, @ 17c / kWh (never been on Tier 2 since I have had solar).
Can Powerwall charge from the grid?
When Powerwall is installed without solar, it can charge from the grid to support backup operation.
When Powerwall is installed with solar, it is not currently able to charge from the grid. Powerwall installations on new and existing solar systems are designed to qualify for the Federal Investment Tax Credit, which requires 100% charging from solar. Powerwall installations must also comply with rules around grid charging which vary by utility.
Yes, but does that apply when you get a PW2? Are you looking to get that gov subsidy that restricts the usage of it? Good luck if it does.
You are grandathered on Net Metering but in 2019 your rate choices will be limited to Time of Use rates. That may change your economics.
Changing lights to LED, definitely, however, if you changed out multiple tv's, a laptop, refrigerator, washer, and dishwasher just to make them more energy efficient, you are NEVER recouping that cost, EVER, not even 1/4 of it. Estimating that entire cost to be $5,500 conservatively (very conservative) and doubled your yearly SCE to $120 (you won't ever see that) and it will take 45 years to pay for itself. Absolutely replace with those options when needed, however if you did to save energy, you just largely increased your total cost of ownership