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<br>
Normally you definitely do not want to tap a high voltage battery
for use at say, 12 or in this case, maybe 48V when the top end is<br>
108V nominal.<br>
<br>
But with a separate charger for the house inverter, (48V ?), and
the 60V side, it would work a lot better than just using<br>
a single 108V charger and tapping down at 48V. As long as there is
enough charging power for both battery sides the<br>
two halves should stay balanced.<br>
<br>
boB<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 7/1/2021 9:00 AM, Dave Tedeyan
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CACaGukN=LuOW0ZGShwtHTckwoJF1UGHPy2035TK3JQVZsDgPEA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Dave,
<div>This is for a boat that will stay mostly on the finger
lakes and in the Erie Canal system in upstate NY. Definitely
not an ocean boat. But the plan is to convert it to a full
time residence, potentially in the winter as well.</div>
<div>Cheers,</div>
<div>Dave</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Jul 1, 2021 at 11:52
AM Dave Angelini Offgrid Solar <<a
href="mailto:offgridsolar@sti.net" moz-do-not-send="true">offgridsolar@sti.net</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">
<p>Less is more offgrid. On a boat, if it is oceangoing, it is
a life or death kind of world. A fire at sea probably will
happen at night in bad seas. Not sure if this is your
clients scenario for their use. An all electric boat sounds
a bit scary. How will they get ashore? I use to give the
owner a schematic that showed the location on the boat of
electrical devices, wiring, and disco's.</p>
<p>Hopefully this is for a lake sailor. Although one of the
round the world guys I know tells me that he was never as
scared as he was on a lake one day...Good Luck!</p>
<div>
<pre> </pre>
<pre><strong><span style="font-size:small">Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" target="_blank" moz-do-not-send="true">http://members.sti.net/offgridsolar/</a>
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text 209 813 0060</span></strong></pre>
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<p>On Thu, 1 Jul 2021 11:21:51 -0400, Dave Tedeyan <<a
href="mailto:dave@sungineersolar.com" target="_blank"
moz-do-not-send="true">dave@sungineersolar.com</a>>
wrote:</p>
<blockquote type="cite"
style="padding-left:5px;border-left:2px solid
rgb(16,16,255);margin-left:5px;width:100%">
<div dir="ltr">Bob,
<div>This is a very interesting idea to have two separate
battery banks in series. I find it odd though that this
particular motor's datasheet calls for 9 12V batteries.
I suppose that I could have one charge controller set
for 48V and the other set for 60V. Although this will
also pose the problem of trying to run the house loads -
if I have two 48V inverters that still leaves one
battery that will get loaded less than all the others.</div>
<div> </div>
<div>And it seems that everyone else is pointing to the
fact that it seems important to keep the neutral and
ground internally separated in the inverter in a boat,
so I'll stick to marine inverters for this one.</div>
<div>Cheers,</div>
<div>Dave</div>
<div> </div>
</div>
<br>
<div class="gmail_quote">
<div class="gmail_attr" dir="ltr">On Wed, Jun 30, 2021 at
5:30 PM <a href="mailto:bob@midnitesolar.com"
target="_blank" moz-do-not-send="true">bob@midnitesolar.com</a>
<<a href="mailto:bob@midnitesolar.com"
target="_blank" moz-do-not-send="true">bob@midnitesolar.com</a>>
wrote:</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div><br>
If you can't find a single compatible charger, what
also works it to use 2 (two) separate<br>
<br>
MPPT charge controllers each with a separate PV array
inputs and connect each CC's<br>
battery to half of the battery bank. This has worked
fine for both OB and MNS controllers<br>
in past years and should with others as well I would
imagine. Set each for slightly higher<br>
voltage than 48V of course.<br>
<br>
One thing you may not be able to do might be
connecting the chassis grounds together<br>
depending on how those grounds are tied to the battery
negative and positive lines internally.<br>
<br>
Sometimes the internal SPD MOVs can get in the way if
their voltage isn't high enough to handle<br>
the two PV voltages that are seen as in series from
the MOV's standpoint. But those MOVs are<br>
usually sized voltage wise to handle much higher
voltage than, say, 300V which would he the maximum<br>
voltage both CC's would see for 150V max input
controllers.<br>
<br>
You also cannot use the same remote controllers if
they are not isolated from battery minus except for<br>
the controller that is on the bottom side of the
battery bank.<br>
<br>
I have seen this method used many times now for 120V
battery banks and also for higher voltage<br>
electric boats. There is quite a bit of this kind of
wiring out there as I remember.<br>
<br>
There are some other standards for marine inverters
like, UL 458 marine supplement and ABYC ratings.<br>
<br>
This includes neutral ground switching like in mobile
apps too IIRC.<br>
<br>
Of course, just adding the word "marine" has to
increase the price not matter what the product is.<br>
\U0001f601<br>
<br>
boB<br>
<br>
<br>
<br>
<div>On 6/30/2021 12:50 PM, Dave Tedeyan wrote:</div>
<blockquote type="cite"
style="padding-left:5px;border-left:2px solid
rgb(16,16,255);margin-left:5px;width:100%">
<div dir="ltr">Hi All,
<div> </div>
<div>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.</div>
<div> </div>
<div>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?</div>
<div> </div>
<div>Cheers,</div>
<div>Dave</div>
<div> </div>
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