pdx_m3s
Active Member
Yes but your Gateway is probably just for grid isolation. With the legacy setups, you would have one or more inverters feeding the Gateway which would then feed the PWs. Now, the inverters feed directly into the PW.
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Discussion: "Powerwall +"
- Thread starter willow_hiller
- Start date
Here is a picture from my plans that I think explains that each Powerwall is designed to be split... Now if the solar can go to the Backup Gateway 2 and charge as if it was grid power... No idea.
pdx_m3s
Active Member
Physically, there’s nothing stopping one PW from charging off of the other inverter when generation is high enough. The whole system is AC-coupled, so if one PW is backfeeding, there’s nothing preventing the other PW from charging during this time. It’s just firmware.
That's what I need to confirm that they will be able to "cross charge". I'm sure there is a better term but that makes sense to me.
Is it weird after having my 2 Powerwall+ batteries installed my idle night time usage jumped from ~600 watts to ~800 watts? I suppose it makes sense that Powerwalls consume power, but 100 watts each seems high to me, anyone know what they actually consume in Standby? If this is wrong is might be a result of my install not being correct/finished.
I did asked about the stacking but not about the gateway. On the stacking the tech mentioned he can stack on floor if I wanted it that way or wall mount if space permits. They will be installing them in my basement in my utility area, the meter and garage is on the opposite side of the house.
Actually they have been ready to install for 3 weeks now, it was my HOA that was holding up the process, I had to get approval from them due to the fact that the 36 panels would not fit on the back side of the roof (house), some would need to be on the front and I had to show 10% production loss without it.
** what i did: I asked tesla to give me a design with the back of the roof maxed out and a design with front and back of the roof, with production for the year for both. I also did a summary outlining the fact that I have an EV and getting another soon so less production was a waste. They agreed and approved, once i uploaded the approval letter I was scheduled the same day.
***Image of the Designed added
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jhn_
Member
There is part of another thread a few months back chatting about this, can’t find it at the moment. But yes it’s normal, seem to be the cooling/heating system in the Powerwalls. I see slightly higher power consumption per hour in extreme cold or heat, but our three Powerwalls consume about 250’ish watts.
Looks like the Powerwall+ has a bug that is going to require a new firmware for 2 or more Powerwall+s to be linked. Yay for buying beta products!
pdx_m3s
Active Member
This is how essentially all gen1 Tesla products are. Early adopters are part of the product development team.
CrazyRabbit
Active Member
i agree it appears the pw is connected to the inverter. i would like to see pictures of the inverter with the cover off. i don't believe dc is being fed to the batteries, but i could be wrong!
I’ll open mine up tomorrow and upload pictures if you want.
Awesome! Did you do a whole house backup? With the two powerwall+ and increased power output, there should be no issues with 1-2 a/c etc?
Correct, whole house backup. I have a single AC unit that is 2.5 tons. Prep-solar my higher peak energy usage was 5 kW. There appears to be a known bug with the new Powerwall+ units another user is reporting there is a fix and will be applied to his system next week.
CrazyRabbit
Active Member
I’ll just received my design plan. I like how that meter adapter switch really simplifies the design for a whole home back up. It has a generation breaker panel for the 2 pw+ and 2 pw2.1’s so it looks like AC coupling is how the sets of panels will charge each other. I have 6 strings and they have east and west side strings evenly mixed across the two pw +’s. The generation panel is wired in parallel into the main power line so no rewiring of the main panel would be needed. Can’t see a downside to this design if the software/firmware is working properly. Easy to add more powerwalls if needed if I can find space.
I agree that's how it looks. But I hope that the level of integration provided by PW+ means that the battery can tell the solar inverter directly to reduce output or shut down if the grid goes down while the battery is full rather than ramping up the AC frequency as is done with PW and independent inverters. And also reduce the time required for backup power to be supplied when the grid goes down, to make the transition truly "seamless" so computers and microwaves are not affected. Maybe down the road a further level of integration might be possible so we have DC-DC conversion from the solar to the battery for better efficiency.
CrazyRabbit
Active Member
it maybe possible to increase round trip efficiency 1% with dc-dc coupling, there would still be a charge controller. big benefit would be system could cold start with dead battery when off grid more reliably.
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