If you can't find a single compatible charger, what also works it to use
2 (two) separate
MPPT charge controllers each with a separate PV array inputs and connect
each CC's
battery to half of the battery bank. This has worked fine for both OB
and MNS controllers
in past years and should with others as well I would imagine. Set each
for slightly higher
voltage than 48V of course.
One thing you may not be able to do might be connecting the chassis
grounds together
depending on how those grounds are tied to the battery negative and
positive lines internally.
Sometimes the internal SPD MOVs can get in the way if their voltage
isn't high enough to handle
the two PV voltages that are seen as in series from the MOV's
standpoint. But those MOVs are
usually sized voltage wise to handle much higher voltage than, say, 300V
which would he the maximum
voltage both CC's would see for 150V max input controllers.
You also cannot use the same remote controllers if they are not isolated
from battery minus except for
the controller that is on the bottom side of the battery bank.
I have seen this method used many times now for 120V battery banks and
also for higher voltage
electric boats. There is quite a bit of this kind of wiring out there
as I remember.
There are some other standards for marine inverters like, UL 458 marine
supplement and ABYC ratings.
This includes neutral ground switching like in mobile apps too IIRC.
Of course, just adding the word "marine" has to increase the price not
matter what the product is.
😁
boB
On 6/30/2021 12:50 PM, Dave Tedeyan wrote:
Hi All,
I am going to be working with someone who plans to completely
electrify a boat. The electric motor is meant to run on nine 12V
batteries, or 108V. The motor manufacturer recommends a charger that
can run on 120V or 240V. But has anyone seen a charger that can take
solar power and directly charge a battery bank of 108V? The
alternative that I see here is to have two separate battery banks, one
for the motor, and one for house loads. Then we would have the solar
charge a 48V battery bank, and then use an inverter to charge the 108V
battery bank. It seems inefficient, although that may be the only choice.
A separate but related question: what is special about a marine
inverter? If there is a 5kw charger for the battery bank, we will need
a large inverter to handle this plus other AC loads, and I am not sure
if there are "marine" inverters this large. And so other than concerns
about getting wet, is there harm to putting a Radian, or a Sol-Ark on
a boat?
Cheers,
Dave
--
Logo <https://www.sungineersolar.com/>
Dave Tedeyan, P.E.
Owner | Sungineer Solar
p: he | him | his
a: 1653 Slaterville Rd. | Ithaca, NY 14850
w: www.sungineersolar.com <http://www.sungineersolar.com/>
c: (607) 288-2898
_______________________________________________
List sponsored by Redwood Alliance
Pay optional member dues here: http://re-wrenches.org
List Address: RE-wrenches@lists.re-wrenches.org
Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm
Check out or update participant bios:
http://www.members.re-wrenches.org
_______________________________________________
List sponsored by Redwood Alliance
Pay optional member dues here: http://re-wrenches.org
List Address: RE-wrenches@lists.re-wrenches.org
Change listserver email address & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
There are two list archives for searching. When one doesn't work, try the other:
https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
http://www.re-wrenches.org/etiquette.htm
Check out or update participant bios:
http://www.members.re-wrenches.org
