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  1. #61

    Default Re: Electric outboard motor batteries

    I'm trying to get my head round replacing my Halfords 110 AH lead-acid leisure battery with a few vapers.
    Please note that any views expressed in this post may be those of the
    originator and do not necessarily reflect those of the reader.

  2. #62
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    Default Re: Electric outboard motor batteries

    Quote Originally Posted by Cap'n Fishy View Post
    I'm trying to get my head round replacing my Halfords 110 AH lead-acid leisure battery with a few vapers.
    Might also help with the midgies.
    Scott

  3. #63
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    Default Re: Electric outboard motor batteries

    Nearly done. Just got to finish the rest of the series and parallel connections and connect the charge/discharge leads.

    Electric outboard motor batteries-img_20191015_163820-jpg
    Scott

  4. #64
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    Default Re: Electric outboard motor batteries

    Looks good Scott, keep us up to date on its performance!
    As well as making sure my lipos are stored at about half-charge, I also disconnect each one from the wiring harness when they are not in use. That way a duff cell will only affect the other 2 around it and not the whole set-up.
    My system is still working well with no drop off in capacity or performance although I did have to scrap the 60amp circuit breaker because it kept cutting off the power. Don't know if it was faulty or not but I'm doing without it now.
    I had a bit of a scare during the heatwave in July. The batteries got extremely hot because they were in the sun inside what is effectively a little greenhouse. They expanded a bit and I thought they were fried but they were OK thankfully. Now on a sunny day I cover them with something to keep the sun off!
    Cheers
    frantic

  5. #65
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    Default Re: Electric outboard motor batteries

    Quote Originally Posted by franticfisherman View Post
    As well as making sure my lipos are stored at about half-charge, I also disconnect each one from the wiring harness when they are not in use. That way a duff cell will only affect the other 2 around it and not the whole set-up.
    Yeah I kept mine at 50% too when not in use for a while and was always pretty careful with the connections to the parallel board ....... apart from one time when I connected the balance lead from one of the packs to the wrong connector on the board.
    Won't have that problem with the new setup as there's only one set of charge/discharge leads and one balance lead. The 18650 cells are all connected in series/parallel as one pack.
    Should get it finished at the weekend and can start testing it for capacity, etc.
    Scott

  6. #66

    Default Re: Electric outboard motor batteries

    That's a great piece of work Scott. Credit to you.

    Luckily, I don't need anything so light and compact, as I strap my Halfords 115Ah Leisure battery under the forward seat of my boat at the start of the season in February and don't remove it until after the end of September. Then I keep it on maintenance charge until it's next installed on the boat.

    It's charged from my outboard engine, which has a nominal 6A output and I have everything cabled through a junction box as a bus system, and a cable runs the length of the boat from the junction box to the battery, and there's a waterproof connector on a flying lead to plug for my electric engine, a cable running to my electric bilge pump with an ON/OFF switch on the junction box and the cable connecting the outboard engine to the junction box.

    I only use the electric engine to trim my drifts, instead of using the oars, the battery never runs down throughout the entire season. My Water Snake electric engine has a digital voltage indicator built in, so I'm always able to see both the static battery voltage, and the charging voltage when the boat's underway.

    For interest, I'll photograph the set up at some point, but for now I have it all stripped off the boat to enable thorough cleaning and wood treatment. Also, I'll probably modify the junction box to add a USB phone charger outlet.

  7. #67
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    Default Re: Electric outboard motor batteries

    Ahoy Scott, was a bit puzzled by your new setup. You say there is only one balance lead, shouldn't there be one for each trio of cells? I'm just thinking of my lipo setup and your old system, each battery needs to have it's cells balanced so the charger/charging plate supplies a lead to each one. If the trios of 1860 cells all need a set of balance wires, that's a heck of a lot of wires you will need!
    Cheers
    frantic

  8. #68
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    Default Re: Electric outboard motor batteries

    Quote Originally Posted by franticfisherman View Post
    Ahoy Scott, was a bit puzzled by your new setup. You say there is only one balance lead, shouldn't there be one for each trio of cells? I'm just thinking of my lipo setup and your old system, each battery needs to have it's cells balanced so the charger/charging plate supplies a lead to each one. If the trios of 1860 cells all need a set of balance wires, that's a heck of a lot of wires you will need!
    Cheers
    frantic
    Hi Phil, it works a bit differently to the lipo setup although you still you have 3 cells making up your 12 volts like you have in a 3S lipo pack. Think of this as one great big lipo pack.
    This diagram shows the wiring better than I can explain.

    Electric outboard motor batteries-picture-device-independent-bitmap-1-jpg

    That's how each row in my pack is set out and connected.
    There's 13 batteries connected in parallel in each row and each row makes up one of the 3 cells which are connected in series.
    This is it with all series and parallel connections finished, still got to connect the main charge/discharge leads.
    The blue & black caps are negative and the red & orange are positive.

    Electric outboard motor batteries-img_20191107_183546-jpg

    The balance lead has 4 wires, the black goes to the negative in the first cell and the other wires each connect to the positive in one of the 3 cells.
    Hope this makes sense.
    Scott

  9. #69
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    Default Re: Electric outboard motor batteries

    Thanks for that Scott, I think I get it! I hope it works OK for you. If I ever fry my lipo set up I will go for something like that. It is a lot cheaper and easier to replace any cells if they fail.
    PS your kitchen unit handles are the same as mine! Ha ha!
    frantic

  10. #70
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    Default Re: Electric outboard motor batteries

    Quote Originally Posted by franticfisherman View Post
    Thanks for that Scott, I think I get it! I hope it works OK for you. If I ever fry my lipo set up I will go for something like that. It is a lot cheaper and easier to replace any cells if they fail.
    PS your kitchen unit handles are the same as mine! Ha ha!
    frantic
    Cheers Phil.
    Takes a bit of time to put together but no more than a cold Saturday afternoon in the winter.
    One thing I've learned since testing it is that the capacity isn't quite as stated.
    It should be 39ah (3000mah x 13) but the charger is saying about 35ah.
    Sure enough, when I googled the Samsung batteries I'm using, the useable capacity is listed as 2700mah per battery instead of 3000mah so 35ah is about right.
    Might need to add a few more cells to the pack but we'll see how it goes.
    Scott

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