I second the Genasun product line. I've done a few golf cart charging systems. 
works like a charm. 
-Wes Kennedy 303-653-3073 

    On Monday, April 12, 2021, 12:03:52 PM MDT, Mac Lewis <maclew...@gmail.com> 
wrote:  
 
 There is a company called Genasun that I believe makes a boost solar charge 
controller to do this.  They are in the marine world and I haven't poured over 
their specs but they are worth checking out.  
Try looking at 
Genasun GVB-8-Li
Good Luck!

On Mon, Apr 12, 2021 at 11:43 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 SzumlanskiFlorida Solar Design 
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-- 



Mac Lewis


"Yo solo sé que no sé nada." -Sócrates
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