Wrenches, I've done a few SI to Li set ups, One must do is to eliminate the BTS with resistor to get 75⁰F Funtimes
On Fri, Sep 11, 2026, 10:15 AM Lou Russo <[email protected]> wrote: > What brand of batteries are you using? > > There is no way to get an accurate SOC on an SI paired with lithium > batteries without closed-loop comms nor is there a means to adjust voltage > setpoints for generator start. > > Every decision the SI makes is based on SOC. > > As far as I can tell, when selecting the battery type > when commissioning the SI, it loads pre-determined setting (none of which > are documented) that SMA has decided on and they can not be changed. So if > you select FLA or VRLA and use lithium it will never work quite right. > > The only lithium batteries I have every used with a SI is Discover Energy > lithium batteries and their Lynk 2. So my experience is limited in this > regard but the combo works well for me. > Lead-acid batteries also work great. > > The SI is a unique beast. Programming it is very different from other > inverters from that time period. > > Lou Russo > Owner > [email protected] > Office - 808 345 6762 > Direct Line - 808 731 1907 > Spree Solar Systems LLC > CT-34322 > > > > On Fri, Sep 11, 2026 at 4:04 AM Jim Gowdy <[email protected]> > wrote: > >> Good Morning, >> I've integrated some lithium battery cells to a single Sunny Island >> inverter (model SI4548-US-10) and I'm having an issue with the Sunny >> Island's SOC. My batteries will be at pretty much full charge and the >> inverter will show something like 50% SOC and it's causing me problems of >> starting the generator prematurely and one time it shut the system down. I >> am still looking through the manual, but I was wondering if there is a way >> to calibrate the state of charge or use battery voltage for my setpoints. >> I'm timid to call their tech support because these batteries are not on >> their approved list. Any input would be appreciated. >> >> -- >> Jim with Gowdy Electric >> Cambria, Ca 93428 >> business 805 927 2630 <(805)%20927-2630> >> cell 805 975 5279 <(805)%20975-5279> >> _______________________________________________ >> 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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