I will be doing this soon as well. My homeowner has two PT-100 charge controllers and a BMK as well. I was planning on using the relay in the charge controller to control a 30 or 40a contactor (with a 48vdc coil) to cut out the loads once the battery voltage gets too low. Magnums LBCO only goes up to 48.8v. And Sol-Max recommended using 50v for their powerflo5 batteries.
And thanks to Zeke for also pointing out (this was specifically for the powerflo5 batteries): Make sure you adjust the settings on the magnum inverter and charge controllers for the batteries. The default DIP switch settings on the PT100 or inverters will not work properly with most lithium batteries. They need to be set for absorb voltage of 57.2 volts for the PF5 batteries, for 10 minutes. Float voltage of 54.0 volts. The defaults all try for a longer absorb time generally a minimum of one hour, which can make the lithium batteries rather unhappy. On Tue, Nov 3, 2026, 11:03 AM jay <[email protected]> wrote: > Thanks david > > What does a new card cost and are they available from the new magnum? > > jay > > On Nov 3, 2026, at 8:55 AM, David Quattro <[email protected]> wrote: > > I recently replaced Lead acid with Lithium with a Magnum. You will need a > to buy a new card from Magnum - original card doesn’t have the proper > charging protocol for lithium. > > > *David Quattro* > President > > On Mon, Nov 2, 2026 at 12:34 PM Jay <[email protected]> wrote: > >> I have someone wanted to do lithium on an older magnum. They don’t charge >> with generator often. >> >> I seem to vaguely remember someone having issues with magnum and lithium? >> Anyone know? >> >> Thanks >> Jay >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> >> https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.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]/ >> https://lists.re-wrenches.org/pipermail/re-wrenches_lists.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: > > https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.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]/ > https://lists.re-wrenches.org/pipermail/re-wrenches_lists.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: > > https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.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]/ > https://lists.re-wrenches.org/pipermail/re-wrenches_lists.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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