In several grid outages prior to installing my Powerwalls, I was providing backup power to the house from an inverter connected to my Nissan LEAF.
I was running essential loads in the house all day, and then shutting off the inverter at night.
My refrigerator was still at 38°F in the morning, and I didn't care about anything else.
My house was drawing an average of 600 watts back then, judging from the drain of the battery in the LEAF over time.
Now that I have two Powerwalls and the Tesla app, it looks like my house has a minimal load of 800 watts. That is an accumulation of an aquarium that was added after I last paid attention to the draw, and some other parasitic loads that weren't powered from the LEAF setup.
If I allow that 800 watts to continue for 10 hours overnight, I will have lost 1/3 of my battery storage. Or is my math wrong? .8 kw times 10 hours = 8 kWh.
I would like to shut off "everything" overnight, and turn it back on when the sun starts shining, so my PV panels can recharge the Powerwalls.
What I would really like is to shut the Powerwalls off, and then immediately let them do their own attempted PV restart, as if they had run too low on battery.
I've read about other people turning off as many breakers as they can, to get rid of parasitic loads (like my DirecTV dish, sound system, networking equipment, etc.)
That seems inconvenient and as much manual intervention as I had with my standalone LEAF inverter.
If I shut them off with the little switches on the Powerwalls, I can't restart them without grid power for five minutes, or the 12 volt battery jumper inside the Gateway.
That doesn't seem like a good idea.
Does anyone else worry about the battery drain overnight during grid outage?
I was running essential loads in the house all day, and then shutting off the inverter at night.
My refrigerator was still at 38°F in the morning, and I didn't care about anything else.
My house was drawing an average of 600 watts back then, judging from the drain of the battery in the LEAF over time.
Now that I have two Powerwalls and the Tesla app, it looks like my house has a minimal load of 800 watts. That is an accumulation of an aquarium that was added after I last paid attention to the draw, and some other parasitic loads that weren't powered from the LEAF setup.
If I allow that 800 watts to continue for 10 hours overnight, I will have lost 1/3 of my battery storage. Or is my math wrong? .8 kw times 10 hours = 8 kWh.
I would like to shut off "everything" overnight, and turn it back on when the sun starts shining, so my PV panels can recharge the Powerwalls.
What I would really like is to shut the Powerwalls off, and then immediately let them do their own attempted PV restart, as if they had run too low on battery.
I've read about other people turning off as many breakers as they can, to get rid of parasitic loads (like my DirecTV dish, sound system, networking equipment, etc.)
That seems inconvenient and as much manual intervention as I had with my standalone LEAF inverter.
If I shut them off with the little switches on the Powerwalls, I can't restart them without grid power for five minutes, or the 12 volt battery jumper inside the Gateway.
That doesn't seem like a good idea.
Does anyone else worry about the battery drain overnight during grid outage?