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Thread: Help with electric motor battery selection and charging

  1. #46

    Re: Help with electric motor battery selection and charging

    BOAT MODS | BLUE BONE and an UNLIKELY MUD CRAB THIEF - Ep 27 - Bing video

    Info on another option for 36 volt Minn Kota's starts at about the 26 minute mark. Know nothing else about it apart from what is featured.

  2. #47

    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by scottar View Post
    BOAT MODS | BLUE BONE and an UNLIKELY MUD CRAB THIEF - Ep 27 - Bing video

    Info on another option for 36 volt Minn Kota's starts at about the 26 minute mark. No nothing else about it apart from what is featured.
    Thanks Scottar that was an interesting watch.


    Shakey - If only I lived near the coast

  3. #48
    Ausfish Addict disorderly's Avatar
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    Re: Help with electric motor battery selection and charging

    interesting info and tidy setup....

    Is ease of charging the reason why the batteries are hooked up in in parallel and a boost converter then used to step the 12v bank up to 36v...?

  4. #49
    Ausfish Platinum Member
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    Kalbarri, WA

    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by Heliduck View Post
    A bit more info for anyone who is interested -
    I spoke to Amptron regarding their battery, it doesn’t have Bluetooth monitoring but they do sell a hard wired battery monitor for $140 which gives you vital data. I reckon this is the way to go, can’t argue with the price of $2495 for the battery. I questioned them on quality as I’m suspicious of a battery which is the same rating but less than half the price of enerdrive, Amptron is a prismatic cell battery made in China (all LiFePO4 batteries for sale in Australia are made in China from what I can find) & the dude I spoke to said he has personally visited several factories in China prior to choosing a supplier who he says is the best they could find. Sounds very similar to enerdrive minus the Bluetooth.
    - “Sealed Performance Batteries” sell the Invicta brand of LiFePO4 battery, their 36V 100Ah battery is $4300 quoted through ARB who are a distributor( they buy them from Sealed Performance Batteries). It has blue tooth monitoring & is also a prismatic cell battery.

    So far I have 3 clear options - Enerdrive at $4995, Invicta at $4300 & Amptron at $2495 + $140 for a battery monitor.
    Big price differences, & from the info I can dig up they’re very similar quality batteries. Watch this space as I haven’t decided yet, my wallet says to buy Amptron but a poor man pays twice. With Amptron’s 4 year warranty it might
    be worth the risk.
    I have a 150ah Amptron,--- the 100amp discharge model, not the 200amp version---installed in my camper. I re-did everything to suit lithium in the setup. I have given it some really deep discharge tests, and it delivers what it promises. Not had it for long, but no complaints so far. I wouldn't touch those Voltax cheapies, the one I have seen stripped down are made with the small cyclindrical cells all spot welded together , which give you about a million possible points of failure just in that aspect alone.
    On the subject of battery monitoring , I bought one of those cheap chinese AiLi shunt monitors. No BT, just a gauge and shunt, bought it after seeing people use them for a number of years with no problems. I have BT on apps for my Victron charger, and both Renogy DC-DC /MPPT chargers, one in the backseat of the spacecab , and the other in the camper. I was going to go for the Victron shunt monitor, but couldn't really justify the outlay, $70 vs $250 or more for the same functionality minus the BT. As you say, BT is cool, but sometinmes you just want to look at a gauge and see what your battery percentage is when you get up in the morning

    I might have mentioned somewhere I was looking at a Baintech Slimline lithium for boat and car duties. I bought one, mounts in the spacecab behind the Engel. I didn't buy the 120ah with the built-in DC-DC, just a plain 75ah. I can move it between ute and boat if I am camping onboard, the Renogy DC-DC is pluggable, so that goes with it. It will be handy for running the pie warmer late in the afternoon after being shut down for a while and the solar is gone. I currently have a regular lead acid start battery working as a house, and you need to conserve energy at night if you want to run the fridge.

  5. #50

    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by disorderly View Post
    interesting info and tidy setup....

    Is ease of charging the reason why the batteries are hooked up in in parallel and a boost converter then used to step the 12v bank up to 36v...?
    I think the main reason is voltage control. There has to be a certain amount of loss through the converter but that may be of lesser concern than the over voltage factor that some MKs have suffered from.

    TMC

    PS. How did you go with the cyclone Ranmar?

  6. #51

    Re: Help with electric motor battery selection and charging

    Thanks for that link Scott, tidy setup and something to think about. I'm assuming $6-7K includes the batteries.

    Quote Originally Posted by scottar View Post
    BOAT MODS | BLUE BONE and an UNLIKELY MUD CRAB THIEF - Ep 27 - Bing video

    Info on another option for 36 volt Minn Kota's starts at about the 26 minute mark. Know nothing else about it apart from what is featured.

  7. #52
    Ausfish Platinum Member
    Join Date
    Mar 2015
    Location
    Kalbarri, WA

    Re: Help with electric motor battery selection and charging

    Well, the house is still standing, unlike many. Massive damage, all the news reports aren't overstating it at all. I'll post up a few pics the show how high the storm surge got.

  8. #53

    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by fishtragic View Post
    Thanks for that link Scott, tidy setup and something to think about. I'm assuming $6-7K includes the batteries.
    You would want to hope so but I don't know. You would have to give them a ring.

  9. #54

    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by ranmar850 View Post
    Well, the house is still standing, unlike many. Massive damage, all the news reports aren't overstating it at all. I'll post up a few pics the show how high the storm surge got.
    That’s good news. Looked very ordinary on the TV.

  10. #55

    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by disorderly View Post
    interesting info and tidy setup....

    Is ease of charging the reason why the batteries are hooked up in in parallel and a boost converter then used to step the 12v bank up to 36v...?
    I’m also wondering if the 7amps per hour on spot lock, is that drawing from the 300amp hours worth of batteries or does it work that at 36v it’s three times that? Does he have 300/7=42.85 hours at that draw before his batteries are dead or 100/7=14.28hours. This stuff I find it hard to get my head around when we start talking converters etc.

    the reason I am asking is that I’m seriously considering going to one of the new trolling motors from Garmin/Lowrance. They are 24/36 volts. No 12v options. Still have to do lot of research on that before making a decision.

    Ranmar, how would you think one of those 75ah Slimline Baintech batteries would go for a start battery on a 60hp outboard?
    Democracy: Simply a system that allows the 51% to steal from the other 49%.

  11. #56

    Re: Help with electric motor battery selection and charging

    Easiest way with conversion to get round numbers is to convert to watts - volts X amps, then divide by the converter output volts to give the output current draw. It's an approximate number as it doesn't allow for conversion loss which always exists to some extent. As a fudge factor I allow 5%. The 7 amp value given will depend where it was measured - the most logical being on the 12 volt line as that's the value that really matters in this configuration as that is the battery voltage.

  12. #57
    Ausfish Addict disorderly's Avatar
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    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by Lovey80 View Post
    I’m also wondering if the 7amps per hour on spot lock, is that drawing from the 300amp hours worth of batteries or does it work that at 36v it’s three times that? Does he have 300/7=42.85 hours at that draw before his batteries are dead or 100/7=14.28hours. This stuff I find it hard to get my head around when we start talking converters etc.

    the reason I am asking is that I’m seriously considering going to one of the new trolling motors from Garmin/Lowrance. They are 24/36 volts. No 12v options. Still have to do lot of research on that before making a decision.

    Ranmar, how would you think one of those 75ah Slimline Baintech batteries would go for a start battery on a 60hp outboard?
    Yeah I'd go with Scottar's version..

    The shunt for the monitor is most likely hooked up to the terminals on the 12 volt bank...

    Whereas on mine the batteries are hooked up in series creating a 36v battery without converter....

    the conditions his boat is in also looks consistent with that 7 amp reading at 12v as using 7 amps on my 36v system would mean i was in choppy conditions or with quite strong current..

    That victron battery monitor bluetoothed to your phone is well worth the $250.

    What are the Garmins worth..?

  13. #58

    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by disorderly View Post
    Yeah I'd go with Scottar's version..

    The shunt for the monitor is most likely hooked up to the terminals on the 12 volt bank...

    Whereas on mine the batteries are hooked up in series creating a 36v battery without converter....

    the conditions his boat is in also looks consistent with that 7 amp reading at 12v as using 7 amps on my 36v system would mean i was in choppy conditions or with quite strong current..

    That victron battery monitor bluetoothed to your phone is well worth the $250.

    What are the Garmins worth..?
    So we are talking 300/7=42hours of run time?

    The Garmin run to 5 grand and I’m thinking with lithium’s that I can’t justify the total spend. All I really need is maybe a 55lb electric with spot lock and 12v for a little 4.3m Webster Twinfisher. It’ll mostly be used in the creeks with the odd day in the bay or on a really good day, close in offshore. Ie 12knots of breeze or less.

    Currently my start battery is on the floor at the back of the boat below small live bait tank. If the 75amp slimline is appropriate as a start battery that would be fantastic as I can mount it on the starboard side under the gunwhale. Anyone have thoughts on that.

    Then a 150amp slimline under the console should be more than plenty to run the electrics, lights and trolling motor.

    I guess I need to decide on what trolling motor also.
    Democracy: Simply a system that allows the 51% to steal from the other 49%.

  14. #59
    Ausfish Addict disorderly's Avatar
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    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by Lovey80 View Post
    So we are talking 300/7=42hours of run time?
    Yep.

    I think my basic setup was around $5500 for 36v motor and Lithiums, circuit breaker, wiring, Victron monitor and 36v charger.

    That video shows a very nice setup but the 2 onboard chargers and converter are a luxury that I didnt need and just more stuff exposed to the salty environment....I just stick the chargers alligator clips on my battery bank to recharge from my 240v at home..its no drama at all just not as fancy to show your mates....

    Though the converter may be worth it as mentioned previously, if it regulates the high voltage so you dont risk the burn-out that has troubled the Minn Kotas..

    Best to talk to someone more knowledgeable then me on that front....It was TMC that made mention of it above..

  15. #60

    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by disorderly View Post
    Yep.

    I think my basic setup was around $5500 for 36v motor and Lithiums, circuit breaker, wiring, Victron monitor and 36v charger.

    That video shows a very nice setup but the 2 onboard chargers and converter are a luxury that I didnt need and just more stuff exposed to the salty environment....I just stick the chargers alligator clips on my battery bank to recharge from my 240v at home..its no drama at all just not as fancy to show your mates....

    Though the converter may be worth it as mentioned previously, if it regulates the high voltage so you dont risk the burn-out that has troubled the Minn Kotas..

    Best to talk to someone more knowledgeable then me on that front....It was TMC that made mention of it above..
    Do you think the Minkota riptide will do the job?

    https://www.bcf.com.au/p/minn-kota-r...011015#start=9
    Democracy: Simply a system that allows the 51% to steal from the other 49%.

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