<div dir="ltr">Wrenches<div>Here is just a thought, each module is either 2, 3 or some with 4 strings within a single module, so you open the junction box remove the diodes and cut the buss jumpers, reconfigure the box to a single longer string to multiply the voltage and equally divide the amperage. you will need to keep the new VOC and VMP within the usable range of the charge controller. Of course this will void any warranty of the module, also be aware of higher voltage when exposed to sunlight. In the past I was involved in military grade manufacturing of foldable modules designed specifically for systems with no charge controller but this is a down and dirty solution. </div><div>Just a thought</div><div><br></div><div>I </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 12, 2021 at 1:52 PM Jason Szumlanski <<a href="mailto:jason@floridasolardesigngroup.com">jason@floridasolardesigngroup.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"></div><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I considered a 96-cell panel, but the highest watt panels don't compare to new 72-cell panels coming out in the 400+ watt range. It's a good fallback position because I might be losing more in the conversion than I am gaining in the higher power output.</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"><br></div></div><br><img width="0" height="0" alt="" style="display: flex;" src="https://mailtrack.io/trace/mail/ff6b6a923b73f5eb0b476aa476050159e9719ae4.png?u=1613865"><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 12, 2021 at 2:23 PM Kent Osterberg <<a href="mailto:kent@coveoregon.com" target="_blank">kent@coveoregon.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
Jason,<br>
<br>
Would a 96 cell Panasonic module fit in the space you have
available? It would give you sufficient voltage to charge this
battery.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<div>On 4/12/2021 10:40 AM, Jason Szumlanski
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="auto">
<div 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 style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div 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 style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div 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 style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div style="font-family:arial,helvetica,sans-serif">Thanks in
advance,</div>
<div style="font-family:arial,helvetica,sans-serif"><br>
</div>
<div style="font-family:arial,helvetica,sans-serif">Jason
Szumlanski</div>
<div style="font-family:arial,helvetica,sans-serif">Florida Solar
Design Group</div>
</div>
<img alt="" style="display: flex;" width="0" height="0"></div>
<br>
<fieldset></fieldset>
<pre>_______________________________________________
List sponsored by Redwood Alliance
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a>
Change listserver email address & settings:
<a href="https://mailtrack.io/trace/link/ee57a11416ed71e7b728797aa2b97ece3a5f03ca?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=0a99a5fa00c5e50e" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a>
There are two list archives for searching. When one doesn't work, try the other:
<a href="https://mailtrack.io/trace/link/9118698e34417bda3b2a7a0c71028e5988fff6f7?url=https%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2F&userId=1613865&signature=37458f340e0ff03a" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a>
<a href="https://mailtrack.io/trace/link/c4673ac9bd8ea50844c2357e03a050d586498f3e?url=http%3A%2F%2Flists.re-wrenches.org%2Fpipermail%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=6aecce0afef0aa74" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a>
List rules & etiquette:
<a href="https://mailtrack.io/trace/link/11c0e7c7b2dae65772dc303c08f0a2c617b76dc2?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=b8e56d63388a8e61" target="_blank">http://www.re-wrenches.org/etiquette.htm</a>
Check out or update participant bios:
<a href="https://mailtrack.io/trace/link/4a17b3355c6fb1198d464e14902e76e42dca3142?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=583520a3d733c417" target="_blank">http://www.members.re-wrenches.org</a>
</pre>
</blockquote>
<br>
</div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br>
<br>
Change listserver email address & settings:<br>
<a href="https://mailtrack.io/trace/link/7a17b47a6ba1a036493e686171fe727c36be4dff?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=219d48c9d6b9dc65" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
There are two list archives for searching. When one doesn't work, try the other:<br>
<a href="https://mailtrack.io/trace/link/1260c603ea6c23f677c5e2be06cb14a80391a36a?url=https%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2F&userId=1613865&signature=e21a6fd1f3ed4005" rel="noreferrer" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br>
<a href="https://mailtrack.io/trace/link/faccc39db7ab2df6792660d963f44fa88519c3de?url=http%3A%2F%2Flists.re-wrenches.org%2Fpipermail%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=191537b1b4819891" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="https://mailtrack.io/trace/link/4a0d10ed0315233c46833783256309caa77970a3?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=3be9a9dff725ed98" rel="noreferrer" target="_blank">http://www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="https://mailtrack.io/trace/link/bd0147fba8ebfd2ffd31ecdcba1d612324cf525a?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=9d70d5812107ab50" rel="noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div></div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br>
<br>
Change listserver email address & settings:<br>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
There are two list archives for searching. When one doesn't work, try the other:<br>
<a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" rel="noreferrer" target="_blank">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br>
<a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" rel="noreferrer" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" rel="noreferrer" target="_blank">http://www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out or update participant bios:<br>
<a href="http://www.members.re-wrenches.org" rel="noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div>