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Yes on the Midnight SPDs. We are on a new page ... so thank you again for your patience and detailed explanations. I've reread the thread at least 10 times. No telling what I haven't yet absorbed though. ;)

Added interlock breaker. > Don't want to get distracted with this right now. But, once I have the base design I'm considering adding the Midnight Solar AC Panel which provides a 60amp bypass from the PV input to the main panel if SI is down. I suppose the interlocked breaker backfeed from...

Focusing on the breakers, I simplified the diagram per this post and another that referenced the 70A main breaker. 70A in the main panel to SIs 56A in the PV landing panel to/from SI. 32A breaker (25A max output) for each SB 6.0 ... will change if I go with the 7.7 (40A breaker for 32A max...

@Hedges, I'm confused about 3 strings; i.e. 3 MPPT. Seems to me I get to maximum wattage with only 2 strings, so really unsure how or why 3 strings would be leveraged. Unless we are thinking 2 of the strings are at 90' different orientation so only 2 highly active at any one time. The...

x sorry jumped on wrong thread. can't figure how to delete.

yes, @Hedges and I discussed. I subsequently saw this (see JPG) from: that helps further clarify. Basically, if grid-tied should have 1W SB for 1W of Sunny Island. I wasn't clear above, the sizing was for the AC-1 (island) side so I'm going for 1:1 on wattage. so, with 2 SI, I will have 2...

@Hedges @MurphyGuy String sizing validation. Sunny Boy 6.0 - 3 MPPT - 10a/mppt - 100-550V operating voltage - 600V max Not committed to this, just using it as an exercise: JA Solar 410 W 40.87 VOC 18x ~410W 41 V 9s x 2 - I didn't write 2p here because each string will go into a separate MPPT...

Agree with your point on price. What if I said I was going to buy the equipment right away, but still was going to approach the build incrementally? Thoughts on that as an approach?

ah, you are right. Can use the SI as battery backup with 1 but need an auto transformer to use SB. Score 1 for you, thanks.

@Hedges @MurphyGuy - When I lead software development projects I'm very good at breaking down a project into achievable units and iterating so that we can both show traction and successes as well as reduce risk to a big bang deliverable. Therefore, my inclination is to do the same with this...

Ah jeez, no idea what I’ve been looking at , but with fresh eyes there’s a plethora of info I must have looked right past. Thx. Reading TFM. ??‍♂️

I cannot find where you get 12kw SI (2x6048) can manage 24kW SB. Here's the Sunny Island datasheet. https://files.sma.de/downloads/SI6048US-DS-en-28.pdf?_ga=2.6202801.344650644.1647641451-782371609.1647173240

@Hedges - Really embarrassing question, but if I have 2 Square D 40MW225 panels with 200 amp main breaker, does that mean I have 400 amps coming into the house? The one panel does not feed the other. They both come from the meter.

I was EECS or EECE (computer engineering) also; University of Illinoi '86/87 with EECS Masters in Artificial Intelligence (useless) '89.

ah, might not know what I'm talking about....should have said 200a panel breaker. No idea on the busbar. Will have to figure that out. I do have a Square D panel 40MW225. So, I'm guessing that means 225a bus bar. Actually, I have two 40MW225s. Truly embarrassing that I have an electrical...

@Hedges if the SI gets connected to the interlock breaker in order to create a micro grid for the grid tie, I’m assuming its connecting via the sunny boy ac port on SI. Won’t there be too much sunny boy generation on that circuit? im assuming my current micro grid circuit to SI is maxed...

Holy cow im drinking from a fire hose. I feel like that freshman in college and I start looking around thinking, I’m gonna have to drop this course. panel bus bar is 200amp. I did Reflect that one accurately yes, I rushed my labeling of the SB just to get at least a pic to discuss out there...

@Hdonly @Any name you wish i will have a grid tie system so I have some concerns that a homemade system would have approval issues so I’m largely looking at purpose-built stuff, but repurposing it for ground instead of roof. should I be concerned about approvals on a ground mount?

i have a metal tile roof mostly North facing so considering a ground mount. Due to extremely rock ground considering a literal on the ground ballasted system. my property is south facing and at a 15-20’ pitch In Virginia at 37’ A couple ideas I’m playing with that I’m looking for people to...

Aye, a trekie, awesome. Well, we always need mo' powa Keptain.

See, this is why we make diagrams. ;) To figure out what we misunderstood and to get further clarification. thx. EDIT: It took a second reading for me to really understand the implications of that. NOW, it makes perfect sense. Updated diagram.

Probably on each new page I should make a THANK YOU post fellas. So, thank you for providing such in depth responses, and thank you in advance for any continued support.

@Hedges @MurphyGuy @newbostonconst My first attempt at a design - Please note I have done zero math yet although there are a few circuit breaker numbers there, I really didn't put much thought into them. I should probably remove them; but the point is to get an architecture designed and then...

Thanks Murphy, I am convinced on the AC coupling. I'm almost embarrassed to ask this question on battery that's confusing me. In SMA docs and your and Hedges references everything is Lithium Ion. I have never seen a reference to LiFePo4 Lithium Phosphate, always Lithium or Lithium Ion. So...

thx. will take some time to consume this. a short term lack of response doesn't mean I'm ignoring it. many questions to come. cheers.

great info in the diagram. Thanks for posting it

Hedges, what do you know about pairing the Sunny Island with LiFePo4 batteries? That should have been in my requirements. Docs say you can use Lithium Ion do you have a link on here where you describe your configuration or better have a detailed wiring diagram? Could learn more just looking...

ah, I see your point. we need a panel to land the sunny boys with breakers. That panel can be considered Tier 1 battery backup critical loads, and the load shed panel is the Tier 2 battery backup critical loads (AC, heatpump, et.al.). i.e. if battery is too low we do not want the heavy...

Lots to unpack there, thank you. I'll start with the Load Shed Relay. Configured like this? Apologies for lack of diagram; hopefully it gets the idea across. [Critical Loads Panel] <--> [Load Shed Relay] <--> [Sunny Boy] <--> [Battery Inverter] <--> [Main Panel] <--> [Grid]...

re: Sol-Ark - was my initial interest due to initial introduction by Engineer775 but issue with high-frequency vs low-frequency inverters and various niggling customer struggles measured against the "it just works" reviews and solid history for both Sunny I/B and Radian has given me pause on...

Getting the hang of responding to the requestor...so repeating this response presumably so Hedges can see it. Thanks Hedges, Perhaps I have misinterpreted some of your posts. I have interpreted from your posts that the Sunny Island doesn't naturally switch from grid-tie to island in the sense...

Thanks newbostonconst; did you add your GS4048 after having a grid-tie micro-inverter system or choose that architecture? Would you choose that architecture again despite the cost?

Thanks Hedges, Perhaps I have misinterpreted some of your posts. I have interpreted from your posts that the Sunny Island doesn't naturally switch from grid-tie to island in the sense that it doesn't frequency shift to keep the Sunny Boys active. I have come to that conclusion because you've...

Thanks BentleyJ, I wasn't liking the required lithium batter with the Mojave. And, it just doesn't have a history. Heard from this forum that Schneider isn't very supportive of DIY; they want professional installers. But, if I can get past the support question might be worth considering.

Requirements: * Modestly large system > 12KW PV eventually to 20KW PV * Grid-Tie sell-back * 12KW PV / 8000 watts available when grid-down * 15-20KW battery * All UL listed components that will pass inspection. Option 1: Outback Radian Flexpower with DC coupled arrays. Option 2: Outback Radian...