Why not put the "grid" input of the victron inverter on the smartload of the SolArk.
This would also mean that you're cycling the Storz batteries all the time, as the smartload would turn off grid power to the victron when the main batteries start draining. But if you set the cutoff for the smarload less than typical low SOC overnight, then it would stay on during normal daily use, and just feed power through the victron to the storz. But if you dropped below that SOC, then the victron would become it's own off grid system till the main ones got nearly full again... not sure if something like that is doable with the relative loads of everything. Other possibillity may be to get a cerbo and node red involved and somehow control the victron to pass through power all the time, but only turn on charging on the victron if SOC is above a certain level on the main bank... could be pretty complicated, not sure... I've not done a lot with the victron ESS and added programming above defaults for simple off grid systems. Something I often do (though doesn't address reusing the old storz batteries in your case), is to put a small victron phoenix inverter on the main 48 volt battery bank, which powers some critical loads (specifically the internet, so I don't lose comms to the AIO if it faults). Don't know how the pytes batteries and SolArk handles this, but with the Sol-max batteries and AIO, it works fine... the battery measures the extra draw, and adjusts the SOC that it reports to the AIO, even though the AIO never directly sees that DC draw off the battery bank. (Jason Szumlanski) > > > I have a new off-grid client with an undersized PV system, and they have > had quite a few problems with batteries reaching low voltage disconnect and > dark start issues. It was time for an upgrade. > > I reused their Sol-Ark 15K, upgraded them to a couple of Pytes v16, and > added PV, but they weren't ready to give up their relatively new Storz > batteries, so I repurposed them with a Victron Multiplus II to be a big UPS > for critical loads like Internet, security cams, boat lift (yeah, it's > critical), refrigeration, and other key loads. These are particularly > important because the home is usually unoccupied. We need remote insight > when the primary inverter shuts off, and this is one way to do it. > > But I am now questioning my judgment. I have dialed back the charge rate on > the Multiplus, which is fed AC Input from the Sol-Ark. I don't need to > charge the Storz batteries quickly when power is restored to the Sol-Ark, > and it's more important for the primary Pytes batteries to get charged up. > It would be great if I could limit charging on the Multiplus to when the > Pytes are full. > > It's hard to go back now. I'm trying to figure out a solution. One thing > that comes to mind is putting a chargeverter on the Sol-Ark's Smart Load > output that would only charge these Storz batteries when the Pytes are full > or nearly full. That would work, but it's an expense I wasn't planning for, > and another parasitic load I don't need (the Chargeverter stays powered up > on DC power even when there is no AC source). > > Has anybody else Daisy chained inverters like this, and what is your > preferred solution? > > Jason Szumlanski > Principal Solar Designer > Florida Solar Design Group > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/attachments/20260904/127dc1a2/attachment.htm > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > 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 > > > ------------------------------ > > End of RE-Wrenches Digest, Vol 2, Issue 9 > ***************************************** > -- Zeke Yewdall PV Engineer NABCEP #031508-89 [email protected] 303-523-3592
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