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

[Jason Szumlanski]

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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