The question nobody answers straight
One battery or two?
Every quote recommends a battery. Almost none tells you where the next one stops paying for itself, because that number sometimes costs them the sale. Give us a year of your meter readings and we will show you the whole curve — including where we would tell you to stop buying.
Run my data
You will need twelve months of usage from SDG&E. It is free, it takes about two minutes, and we show you exactly where to click.
8,760 hours simulated in your browser. Nothing is sent anywhere until you ask.
Example household
Evening-heavy, about 18,000 kWh a year. On this usage we would build — kW and — batteries.
Run through the same engine your own file would use. Your evenings are not this household's, which is the entire point of uploading yours.
Start with your twelve months
SDG&E records your usage every fifteen minutes and lets you download it. It is your data and it is free.
Look for this on sdge.com
SDG&E's own six steps
- Log in to My Energy Center
- Click the Usage tab
- Select Electric using the Meter dropdown above the graph
- Click Green Button Download below the graph
- Choose 12 months and CSV
- Click Download
Opens SDG&E in a new tab, so this page keeps your place. Come back when you have the file.
Your data came with you
We already have the twelve months you uploaded a moment ago. Nothing to do — the simulation is below.
Drop your Green Button file here
CSV or XML · read on your device, not uploaded
You are looking at the example household, not your own data. Upload your file to replace it.
On your usage, we would build
— kW of panels + —
And here is where we would tell you to stop
What each configuration costs you a year
Your electricity bill under each build, simulated against your own meter. Bars are annual cost — shorter is better.
Your average day, before and after
Change the build and watch it move
These are simulated electricity costs, not a quote and not a savings promise. The simulation uses published SDG&E TOU-DR1 time-of-use prices, a 13.5 kWh battery held at a 20% backup reserve, and a modelled array on an unshaded south-facing plane. Your real bill depends on your rate plan, your baseline allowance, any CARE or FERA discount, whether your generation comes from SDG&E or San Diego Community Power, and a proper shade study. What it does not include is the cost of the system itself — see below.
The number this cannot know
What the system costs you each month. That depends on the design, the incentives you qualify for and the terms you are offered, and anyone who quotes it from a web form is guessing. If you have already been quoted, put the monthly figure in below and we will show you where you would actually stand.
Your position with that payment
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