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.
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.
Kent Osterberg
Blue Mountain Solar
On 4/12/2021 7:27 PM, Jason Szumlanski wrote:
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 <luccheseso...@me.com
<mailto:luccheseso...@me.com>> 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
<ja...@floridasolardesigngroup.com
<mailto: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 Szumlanski
Florida Solar Design Group
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