Thomas's post didn't make it to me. I'm pleased to see it completely
quoted here.
On 5/28/20 8:09 PM, Alan Arrison via EV wrote:
Tom, could you give some specifics on this system, or point us to a web
page?
What battery? What inverter?
Thanks, Al
On 5/28/2020 1:24 PM, Thomas Keenan via EV wrote:
Where I live, the local utility has some odd rules, but I do get
credited $0.06968 for each kWh given back to the grid. I have a
permitted 4 kW array that feeds a Darfon/Panasonic inverter/charger
for a 15kWh (useable) battery that was commissioned in January. The
battery covers times when the panels aren’t putting out enough to
power the house, such as overnight. Overnight, the house uses two or
three kWh that comes from the battery. In the morning the battery
recharges, and is typically done charging around 10:30 in the AM.
After that, any excess is sold.
This inverter/battery setup has been working very well. The battery
has not been below about 50% so far, and that was during a three-day
rain event where the system wasn’t producing much. Aside from those
(somewhat rare) rain events, I generally have around 10-20 kWh excess
that is sold back to the grid daily.
This is much the same as my PowerWall set up which has been running
about 15 months. The PW allows me to avoid all electricity purchases.
But the PW cost can not be justified by the savings.
I sell over production for $.0645/kwh and buy at about $.10. The PW
allows me to not buy about 10kwh each night. So, my daily savings from
using the PW is only about 10 x ($.10-$.0645) or less than $.50/day. I
don't buy the 10kwh at night but I have to use 10kwh during the day to
charge the battery and thus do not sell that 10kwh. The PW cost $13k.
I justify that cost with grid down security.
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