Jason, Mack, Maverick, Kent and John, Looks like the Genasun absorb set points are 57.6 right? Were you still needing this for a LiFePO4 battery option Jason? Maybe they offer a different voltage setpoint option I’m not seeing? I’ve needed something like this for a couple applications as well. Even if something like this existed to boost output voltage before going into a larger controller like an FM60 or Midnite option.
At least with today’s newer 60 cell modules we can put a couple in series and Vmpp will still be high enough to hit absorb set points for lithium options even after heating up. A luxury we didn’t have in the past with FLA and periodic requirements for EQ’ing. I know two 60 cell modules is much more footprint than a single but at least we have that. Enjoy your night, Nick > On Apr 12, 2021, at 10:40 AM, Jason Szumlanski > <ja...@floridasolardesigngroup.com> wrote: > > I want to charge a 51.2V LiPO battery with a single 420W 72-cell module. Vmp > is 40.14V. > > It's one of those situations where I just need a lot of battery capacity as a > backup for a specified time period, but it doesn't matter how long it takes > to charge it back up. And I have space for exactly one 72-cell module. > > It's going to be a Victron inverter. I'm not sure if they make a DC-DC > solution for this charging scenario or if there is another way to accomplish > it without too much cost and complexity. I was half-heartedly thinking about > an AC coupled microinverter, but that has drawbacks in terms of efficiency I > think. Maybe that's not any worse than DC-DC conversion - I'm not sure. AC > Coupling would probably be cheaper and easier. Monitoring might be > difficult/limited. And AC coupling would require that the inverter be on > (inverting) which isn't ideal for this situation either. > > Thanks in advance, > > Jason Szumlanski > Florida Solar Design Group > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > 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/re-wrenches@lists.re-wrenches.org/ > 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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