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.
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! Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ [1] e-mail [email protected] [2] text 209 813 0060 On Thu, 1 Jul 2021 11:21:51 -0400, Dave Tedeyan wrote: Bob, 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. 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. Cheers, Dave On Wed, Jun 30, 2021 at 5:30 PM [email protected] [3] wrote: 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 -- [5] Dave Tedeyan, P.E. Owner | Sungineer Solar p: he | him | his a: 1653 Slaterville Rd. | Ithaca, NY 14850 w: www.sungineersolar.com [6] c: (607) 288-2898 _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org [7] List Address: [email protected] [8] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org [9] There are two list archives for searching. 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