That's what I was thinking. Not a MPPT controller... Just a "dumb" booster that put the voltage high enough for any off the shelf MPPT controller. But it can't really work like that. The MPPT function need to be at the lower voltage side of the device I think.
On Mon, Apr 12, 2021, 9:38 PM Nick A Lucchese <[email protected]> wrote: > 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 < > [email protected]> 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: [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 > > 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 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
