I also worry about getting the system to 64 hz. That is hard on motors and might be the cause of the Light pulsing you’re seeing drake.
Jay > On Jul 31, 2022, at 10:08 AM, Drake Chamberlin via RE-wrenches > <[email protected]> wrote: > > > Yes, we have a system with AC and DC coupled arrays on an off-grid system. > Having DC coupled capacity is important for reasons given in other posts. > > We used AC coupling due to shade issues, so we could use Enphase inverters. > > In your case, if the house really is going to go on grid, I would think AC > coupling makes sense. If not, I'd use high voltage DC charge controllers > (like the Schneider 600 V units) and keep it DC. > > The main complaint I have with AC coupling off grid is that some lights tent > to strobe in certain charging conditions. Another complaint is the 5 minute > delay period after the micro-inverters shut down. The micros are phased, > based on battery voltage, so they don't all shut down at once. > > > > Drake Chamberlin > > Athens Electric LLC > > Ohio Electrical Contractor’s License 44810 > > CO Master Electrician’s License 4526 > > NABCEP Certified PV Installation Professional > > > > > > --- > > > >> On 2022-07-30 12:30, Kirk Herander via RE-wrenches wrote: >> >> All, >> Anyone out there successfully AC-coupled inverters in an off-grid system? >> Advantages vs. pitfalls? >> >> In my case I'm thinking of its practicality with a Solaredge inverter >> AC-coupled to an OB Radian inverter. OB firmware makes this pretty easy now. >> So effectively the Radian is always operating in a grid-backup mode. >> >> I already upgraded the system to the Radian, and soon to add 5kw of >> pole-mounted PV(currently only 1.8kw of 22-year old PV on the roof). This >> system also just got 16kwh of Blue Ion LFP batteries. >> >> This is a last-minute thought I have instead of investing in additional DC >> charge controllers for the new array. >> Cost-wise there's not much of a difference between several high-quality >> charge controllers and a smaller SE inverter w/optimisers. Thanks. >> >> -- >> Kirk Herander / [email protected] >> Owner|Principal, VT Solar, LLC >> Celebrating our 31st Anniversary 1991-2022!! >> www.vermont.solar >> dba Vermont Solar Engineering >> 802.863.1202 >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org >
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