[RE-wrenches] Charging 48V Battery with One Module

[Nick A Lucchese]

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 <jason at 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
> 
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