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IF you have money to blow, get 10For 6.12kw system, would 3 or 4 powerwalls be overkill?
Depends on what you are using them for, and what your utility allows.For 6.12kw system, would 3 or 4 powerwalls be overkill?
For 6.12kw system, would 3 or 4 powerwalls be overkill?
It isn't about overkill; it is about how large a load do you want to support for how long, and what time of year. I.e. do you have an older 5T AC that draws 120A at startup, or do you want to be able to run your AC from six to midnight off of the powerwalls?For 6.12kw system, would 3 or 4 powerwalls be overkill?
I initially wanted 4 & the "engineers" suggested 2. Well, 2 wouldn't get me through the night, so I added 2 more. Now adding a 5th. My suggestion would be to get what you can afford at the start & save the hassle of multiple permits & installation costs.I know this has been discussed 100 times, but since every situation is a bit different I wanted to get some more opinions. Installer is recommending 2 Powerwalls. 15KW Solar System. Should offset us about 92-95%. I am looking a whole house backup situation. We have 2 Air Units. I am OK not backing up our upstairs unit if need be. I have 400a service. 3000 sq ft house. Around 20,500 KW annual energy use. I live in North Carolina. Hot Summers and mostly mild winters. I just know it will never be cheaper to add a third one than now. 3 is about the max of our budget. View attachment 965963View attachment 965964View attachment 965965View attachment 965966View attachment 965967View attachment 965968
Right. I started with a contract with two, went to three before it was finished, and now am wondering about going to four after a few months of operation. And I have one 2 ton central air system, one 200A load center, and a small house. Two would have gotten me over the whole house backup threshold, three put me squarely in that space, and four would give me the luxury of getting thru a hot night with AC running, followed by a cloudy day with lower solar production and the next night, during a grid outage. Just had one of those three day outages where exactly that happened, about three weeks ago....I initially wanted 4 & the "engineers" suggested 2. Well, 2 wouldn't get me through the night, so I added 2 more. Now adding a 5th. My suggestion would be to get what you can afford at the start & save the hassle of multiple permits & installation costs.
I am with you. I wanted to stay within budget. I started with a 13k system and 1 Powerwall. Now I am at a 15K system with 3 powerwalls. Probably the better thing to do, would be up the system and get 2 powerwalls. I have net metering. 1-1 ratio for 5 years.Right. I started with a contract with two, went to three before it was finished, and now am wondering about going to four after a few months of operation. And I have one 2 ton central air system, one 200A load center, and a small house. Two would have gotten me over the whole house backup threshold, three put me squarely in that space, and four would give me the luxury of getting thru a hot night with AC running, followed by a cloudy day with lower solar production and the next night, during a grid outage. Just had one of those three day outages where exactly that happened, about three weeks ago....
If I had a 4 ton HVAC unit I would be knowing I wanted four PWs. No question.
And for the OP - go with more than 15 kw production, if you can get it on the roof. You'll be glad you did - I stuffed a couple more KW onto mine, and have been glad of it ever since. I never really max out the two 7.6 kw inverters, but get consistently closer to doing that. Better production. Cost me an other $5k, but its all paid already and almost forgotten.
I am at 6.99% financing. We are at 92-95% offset. I think with the 3 powerwalls we can get close to 100%. I guess adding 2-3 panels wouldn't cost that much more.I was in the same boat! My original design was 16kw and 3 powerwalls. After Tesla and my utility fought for nine months over trying to get the PW+ inverters approved, Tesla called me and said they needed to redesign using the prior gen inverters. I said, 'well, if you're going to redesign, let's add stuff'. Adjusted to 20.4kw and 4 powerwalls. I had spent those nine months perusing forums and reading as much as I could. I was locked in with Tesla at 0.99% financing, so it didn't make much difference. And I can say without a doubt, I am very happy I requested the increase change. I'm at 123% solar offset, so I've got some room to grow. Makes a great point for a possible future EV purchase for local driving.
We've been self powering since going into operation. It hasn't been that long, and we haven't seen a winter season yet....The estimated offset percentage was lower than yours. Tesla's estimated production appears to have been low, but we haven't seen a full year so I make that statement based on projection of current generation rather than a full year's actual numbers.I am at 6.99% financing. We are at 92-95% offset. I think with the 3 powerwalls we can get close to 100%. I guess adding 2-3 panels wouldn't cost that much more.