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Used former neighbor as GC to put an addition on the house. His subs, including electrical, and they used a Square D disconnect on the meter line but HO for the new panel. Upgrading the shop's panel for solar and I got HO based on their usage.

I also want purlin mount, what did you use to connect panel to the VB 67. I was thinking Versagard for the 3.6" bolt height, plus rail height, to help with summer heat.

Probably why I should stay with 120% limit. With a double picking up 120v from L1 and L2 for 240v, it also picks up N amps form each side but ends up with N amps and not 2N So count one side only. Thanks for helping.

No, counted total both sides. So a double 100a counts 100 for each side? Total of 11 doubles out of 16 breakers. Counting again, left side 285a, right side 340a. Left dbl 50, dbl 20, 5 single 15s Right dbl 30, dbl 20, 6 single 20s, dbl 100

Staying with the 120% rule. Counted breakers in the two room addition's 200a main panel and they total 585 amps. That includes the double 100a feeding the shop panel and a double 30a dryer breaker but no dryer.

Didn't know about sum of breakers, thought 120% ruled. Thank you.

Future proofing a second inverter feed to the lightest loaded 200a main, shifting amps from load to solar back feed.. Three mains split at the meter so grid tied nicely avoids which CT to measure. What makes future changes easier? Your 62.5a caution made me thinks some more.

Hoping the 175a main would still work if I ever decided to go hybrid and battery using a Sol Ark 15 or EG4 18kPV. No outages since the freeze making battery backup a low priority.

No, going with a 175a in the 200a main. Easier than a panel swap and gives me 65a of backfeed ability. Covers SA 15 62.5a out, EG4 18 50a, and an 11.4 48a. 1.25x48=60a breakers. Be interesting to see how many amps that 200a uses and see how low that main could go. Doubt it is over 100a...

Tempting to swap the 225 amp main with the 200 amp main breaker, but NEC probably frowns on that. Changing the 200 amp main to 175 amp main should be OK and pass the calculation rules. Swapping enclosures is more than I want to do. The addition doesn't use many amps so a 175 amp should work...

Inverter AC out to a tap on the 100a line to the 200a main panel's breakers, does the 120% 40a limit go away? Is changing the 200a main to 175a easier? The 100a panel is being replaced, perhaps become a one breaker combiner/pass through. A hom3060L225 arrived today and I have a QO225vh...

Sorry to make this so long but comments are helping. First the house panels, 1997 GE. four load wires go through the back of the meter panel, through exterior wall, and through the back of the right 200a panel's lower left corner. One pair to the right main and the other pair through the stud...

Thanks all for the help. This is an old-1987 100a panel, not so old-1997 house, and 2019 addition. Original owners had an apartment in the 50x60 100a building supporting 50g hwh, jacuzzi, dryer, and motel style hvac (low heat, high heat, etc). Still worked when I arrived in 2010. Originally...

Cut and paste dropped lines. Replacing 12 breaker 100a shop panel with larger, need more breakers and amps as need for inverter. 225a on order,

When we did the addition for a mother in law apartment the County asked for a septic engineer's report that the current system could handle an additional bathroom. It could but, before we drain line covered, a County septic person came out, checked the drain connection for proper slope, and...

No city inspectors only utility. Nothing has raised a question about size until you get to megawatt production. Utility currently feeding my meter enough for three 200a main panels, should be able to send a few watts back. Didn't know about the 120% rule until joining here. The 200a picture...

Looking at ways to pass the 120% rule. Need to get to 40 amps or less and the Growatt 9k-18kPV does that with 38amps AC out. Larger two are 42 and 48 amps. Is an 18kPV inverter enough for 15-17kPV of panel's any over production? Will it just clip with planned east west split helping? Worst...

Just went through Ebay and QOM2s, 125-225 amps, can be had for ~$80 and up. Prices overlap. Getting the hom3060L225PGCVP panel for the 100 amp line as it will take 200a if I need a line upgrade. Can't decide between QOM2s 125, 150, or 225. 225 for future needs and never need to change, 150...

I see what you mean about breaker size. Encouraged by lower prices then found the Square D chart with QOM 1 and 2 frame sizes with the breakers for each. 2s seem almost $100 more than the 1s with the big box stores out of stock. Electrical sites are closer to Square D's list price.

Been awhile so I pulled the 100 amp panel's breaker cover and found the incoming mains are 4awg copper and not aluminum. Old panel label says 100a but a 125 main was installed before I got here. 12 breaker slots, some filled with 1/2 breakers, other with double wires - this panel is going...

Looking at breaker change for 120% rule. With 200a feed, what determines a panel's amps - manufacture label, main breaker, volume for larger wires? Is code OK with changing a 200a panel's 200a main to 225a main breaker, or do I need a 225a panel? I assume you can change a 200a panel to a...

Yes, before utility said CB disconnect was OK I was looking at expensive blade disconnects. Hadn't thought about solar AC out needing such a small disconnect. Target is 14kW of panels, pvwatts pushes that to the high teens. More than I need now but starting grid tied saved over hybrid. Panel...

Utility solar manager sent the solar inspector out to see what I had. Said the existing CB disconnect, next to meter, was OK but a second needed at the solar building and grid tied would be approved pending final inspection.. He did pull the meter and confirmed three lugs, one going directly...

The utility requires a second disconnect at the inverter end where solar AC goes underground . I could hire an electrician, coordinate with utility, and replace the Square D 200a CB disconnect and with a knife type. And I have my second disconnect for the other end. Any difference from where...

Learning more about 120% rule and load vs line. Where does the ability to tap line side end - at first ocpd? One of my meter feeds is external to an adjacent 200a disconnect (Q22200NRB). Does the 200a CB inside the disconnect make it an ocpd? Would changing to a knife style disconnect allow...

Or, the original questions, would a Siemens bolt on pass code in a Homeline? Or if lower cost used Sq D 225a $70 on Amazon, same or less on ebay, worth buying. $130 for a homeline 225, with a few breakers, plus the 225A amp main. 150a panel, with 150 main plus a few smaller for $209. Keep...

Sorry tried to change mid thought and deleted while editing original post. Yes, more 150a and 200a available, 150A main as in 200x1.2=240-150=90a? That would work but you caught me trying to bring over as many amps as I could.

Running wire for new breaker panel in building where solar is going. Attached 200a panel connects directly to the meter through a disconnect. The lower right pair of breakers feed 100a to the shop/solar building. A supply side taps with four double entry, four hole polaris using Hedges idea...

Looking for least disruptive, code passing, change to get more amps for the inverter's 48a. Easiest changing the dual 100a breaker to more amps and the main 200a breaker to 175a. Volt55 suggested a pass through panel though I but want two load breakers - if allowed. Or a box is added to the...

I don't claim to fully understand the 120% rule but one definition referred to the main service panel capacity. I appear to have three main service panels each connected directly to the meter. Two wired through the back of the meter panel, through the exterior brick, and into the back of two...

Discussing grid tied inverters and AC amps out, Hedges wrote about the 120% rule and breaker choices. Liking the Growatt 11.4 grid tied, 48 amps AC out means an existing 200a breaker needs to be changed. My meter has three lugs wired to three 200a panels. One 200a panel connects to a 100a sub...

Agree but I pretend I am a good neighbor and not take grid watts from them :). Rewiring the house for a single feed (disconnect and CTs), before feeding the two house panels. Changing the meter's shop line to a house panel was included in the initial $7K estimate and with more questions left...

Almost. Will raves about S-A 15 and 18kPV quality and 10 year warranty enough so that others seem marginal. Little is lost trying Growatt and a lot saved. With utility saying grid tied OK, not sure they would accept a hybrid acting as grid tied. Just haven't seen as much on Growtt compared...

Previously robbob suggested another look at the 18kPV manual wiring. It still shows CTs used in all five diagrams. Signature has said the same. It was a good idea so I pulled up the S-A 15 manual and in section 4: Grid-Tie and No Battery Install Tips (Passthrough mode) 1. Check the “🗹 No...

I looked at my steel purlins again and they are 4.5 - 5 ft apart. Which means some panel borders will have one or two trapezoids to support the sides of two panels. I would feel better with mounts screwed to purlins and not the thinner panel. XR10 can span 5.5ft in 140 mph wind, and work...