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Genasun is a very interesting option and it looks like they also
have a charge controller set for 54.2 volts which is probably the
right charge voltage, but it is only rated for a PV max power point
current of 8 amps (maybe 9). Ten amps from a 420 W solar panel might
be pushing it too hard, certainly beyond its specs.<br>
<br>
Most "dumb" voltage converters operate around 85% efficiency. If
taking that much loss, it would be better to use a lower power,
higher voltage PV module with a common MPPT controller. That is one
less part to fail too.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<div class="moz-cite-prefix">On 4/12/2021 7:27 PM, Jason Szumlanski
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAE438R8LGOMYe_o04C1PPz+i=VWRC1933TjTNB7hJ13NbL0n3Q@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">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.</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Apr 12, 2021, 9:38 PM
Nick A Lucchese <<a href="mailto:lucchesesolar@me.com"
moz-do-not-send="true">lucchesesolar@me.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word;line-break:after-white-space">Jason,
Mack, Maverick, Kent and John,
<div><br>
</div>
<div>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\u2019m not seeing? I\u2019ve 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.</div>
<div><br>
</div>
<div>At least with today\u2019s 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\u2019t have in the past with FLA
and periodic requirements for EQ\u2019ing. I know two 60 cell
modules is much more footprint than a single but at least
we have that.</div>
<div><br>
</div>
<div>Enjoy your night, Nick<br>
<div><br>
<blockquote type="cite">
<div>On Apr 12, 2021, at 10:40 AM, Jason Szumlanski
<<a
href="mailto:jason@floridasolardesigngroup.com"
target="_blank" rel="noreferrer"
moz-do-not-send="true">jason@floridasolardesigngroup.com</a>>
wrote:</div>
<br>
<div>
<div dir="ltr">
<div dir="auto">
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">I
want to charge a 51.2V LiPO battery with a
single 420W 72-cell module. Vmp is 40.14V. </div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">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.</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">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.</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">Thanks
in advance,</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">Jason
Szumlanski</div>
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif">Florida
Solar Design Group</div>
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