Converting to 230V setup

Discussion in 'OnBoard Electronics & Controls' started by skatun, Mar 16, 2020.

  1. skatun
    Joined: Sep 2010
    Posts: 35
    Likes: 3, Points: 8, Legacy Rep: 10
    Location: Aachen

    skatun Junior Member

    Hi all,
    So we bought an old racing yacht 6 years ago and has been transforming it into a fast cruiser. Since we didn't have any propane on-board the choice of going for 230V were easy. So far we have installed induction cook top, water boiler, dish washer, baking oven, hvac, electric grill and floor heating. All of it running on 230V. Until now we have just used it when running on shore power, but now summer is coming and it would be nice to use while underway as well.

    Last year we installed:
    1. New 12v starter motor(SM)
    2. a 12V 55A alternator(ALT) .
    3. We have now got a hold of 2.2kwh(LiFe) of Nissan Leaf battery running 3S2P(24V)
    4. Inverter(INV,https://www.amazon.de/gp/product/B01M8LOSA3/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1) which can produse 2.4kW continous and 6kW peak. It has inbuilt charger for Lipo and has solar panle input.
    5. We have also built a targa and installed 500W peak power of solar panel(PV).

    Until now we have had one starter battery and(GEL) one battery bank(GEL), however we have now gotten two of these battery selector(BS,US $13.11 52% OFF|12V/24V Dual Battery Selector Switch 300A Battery Main Switch 4 Position Switch Selector for Car RV Boat|Car Switches & Relays| | - AliExpress https://www.aliexpress.com/item/33010385984.html?spm=a2g0s.9042311.0.0.27424c4dD5NMgq) . So thats what we have got so far, now the question is what else do we need?

    We assume we need :
    1. Seperating diode(TD): https://www.amazon.de/dp/B01BF5BYPS...=1-2&swrs=A195057A78F778C048928E93759A6F63&th
    2. 24V to 12V DC/DC converter?
    3. BMS: US $7.73 11% OFF|DYKB smart BMS 6S 7S 24V 60A 80A 100A li ion Lithium battery protection board balance Bluetooth phone APP UART software monitor|Battery Accessories| | - AliExpress https://www.aliexpress.com/item/4000431582969.html?spm=a2g0o.productlist.0.0.ab367546SBI4t0&algo_pvid=4ee8a6fb-a18d-4ad2-a68d-ab1923532c1c&algo_expid=4ee8a6fb-a18d-4ad2-a68d-ab1923532c1c-17&btsid=0ab6fab215843500999346317e449d&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
    4. 12V charger for Lipo 24V battery

    So the schematic which I have drawn below is that correct, or am I missing something?

    I am little bit worried about that the inverter is a single point of failure, the fuse will handle over current if the inverter fails to do this, but there is no under voltage protection of the battery except of the inverter, and there is no protection if the charger fails and overcharge the battery. Is this something to worry about?




    IMG_20200316_102426.jpg



    Hope the sketch is clear:)
     
  2. gonzo
    Joined: Aug 2002
    Posts: 13,953
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    Location: Milwaukee, WI

    gonzo Senior Member

    It is missing the ground connection for the 230V from shore power and the inverter. Also Ground Fault protection. You may also consider an isolation transformer for electrolytic corrosion protection.
     
  3. Ike
    Joined: Apr 2006
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    Location: Washington

    Ike Senior Member

    Frankly, you should hire an electrical engineer with experience in marine systems. If you make a mistake here it's going to cost you your life or the boats.
     
  4. gonzo
    Joined: Aug 2002
    Posts: 13,953
    Likes: 486, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    There is an article in Professional Boatbuilder magazine with the proper circuit design for isolated and non-isolated systems. Read it online and copy the diagram.
     
  5. Ike
    Joined: Apr 2006
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    Location: Washington

    Ike Senior Member

    Which issue is that in?
     
  6. gonzo
    Joined: Aug 2002
    Posts: 13,953
    Likes: 486, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    October/November 2019 by Steve D'Antonio, page 100
     

  7. Ike
    Joined: Apr 2006
    Posts: 2,283
    Likes: 204, Points: 63, Legacy Rep: 1669
    Location: Washington

    Ike Senior Member

    Thanks I'll look it up. Must have missed that one.
     
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