I assume it works only because the inverters are sync'd in a leader/follower(s) coordinated relationship.
But I've certainly had problems getting the full (additive) power out of multiple Sol-Arks (for example). Blake On Wed, Feb 4, 2026 at 3:31 PM Jason Szumlanski via RE-wrenches < [email protected]> wrote: > Hi all, > > When backing up a 400A service with multiple paralleled all-in-one > inverters by combining the AC inputs and outputs, the individual inverter > transfer switches must operate in a synchronized manner. Come to think of > it, the same thing applies to backing up 200A service with paralleled > inverters. Are these tested for this function? – I assume so. > > I'm really asking because Sol-Ark seems to be the only brand that > specifically addresses 400A service in documentation, although not very > clearly in the manual itself. Their training and literature support passing > through additive grid pass-through with multiple inverters, which implies > that they are additive in their ability to transfer power. See attached > examples. > > I have not found anything from EG4 (for the 18kPV) or the Midnite AIO that > specifically addresses this. > > In other words, how can we assume that paralleled inverters will be > additive in terms of their ability to transfer high levels of current that > exceed the rating of a single unit? Is that even addressed in listings? The > documentation is quite poor from all manufacturers (no surprise there!) > > I do have a couple of grid-interactive Midnite AIO systems with four > paralleled AIOs backing up 400A services, and so far, so good. My engineer > signed off on that. > > > Jason Szumlanski > > > * <http://www.floridasolardesigngroup.com/>* > _______________________________________________ > 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 > > -- Blake Gleason, PE | Employee Owner Director of Innovation and Technical Excellence O: 510-845-2997 x128 C: 510-867-5878 [image: sunlightandpower.com] <http://sunlightandpower.com/> <https://linktr.ee/SLP_Socials> 1035 Folger Ave. Berkeley, CA 94710 www.sunlightandpower.com License #326203 <https://benefitcorporationsforgood.com/> [image: https://www.amicussolar.com/] <https://www.amicussolar.com/> [image: https://calssa.org/] <https://calssa.org/>
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