<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>
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<pre><strong><span style="font-size: small;">Dave Angelini Offgrid Solar
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<p>On Thu, 1 Jul 2021 11:21:51 -0400, Dave Tedeyan <dave@sungineersolar.com> wrote:</p>
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<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>
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<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>
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<div class="gmail_attr" dir="ltr">On Wed, Jun 30, 2021 at 5:30 PM <a href="mailto:bob@midnitesolar.com">bob@midnitesolar.com</a> <<a href="mailto:bob@midnitesolar.com">bob@midnitesolar.com</a>> wrote:</div>
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<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>
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<div dir="ltr">Hi All,
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<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>
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<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>
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<div>Cheers,</div>
<div>Dave</div>
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