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Thread: Help with electric motor battery selection and charging

  1. #31

    Re: Help with electric motor battery selection and charging

    Cant speak more highly of the Sterling Pro Charge B for charging your trolling motor batteries on the fly. Very simple to install and works a treat. Initially I had a Mariner Procharger installed on the boat which I had to plug in overnight before heading out but this system with the Sterling works much better for me now given I have a dual circuit charging on the outboard and the dedicated house/start battery set up. The Sterlings are $$$ but worth it and are Lithium compatible for future proofing.

    Good watching here in this clip on the dangers of cheap lithium batteries


  2. #32

    Re: Help with electric motor battery selection and charging

    Great info in this thread, like others Iím researching LiFePO4 batteries for a 36V minnkota. What Iíve been told to date differs a little from what a few other people have done -
    - Itech - I spoke with a technician who told me that they only make up to 24V as their BMS displayed cell instability above that voltage. They didnít consider the 36V market big enough to justify the research & development to resolve this so they didnít bother. Their internal BMS wonít allow for connecting batteries in series according to him.
    - victron donít make a 36V & donít recommend connecting multiple batteries in series.
    - Enerdrive make a 36V 100Ah , RRP $5600 but their distributors could give a discount on that(Keoughís Marine have them for $4995). Developed specifically for the minn Kota market apparently, looks like a good battery but BIG $$$!!! 2 years warranty + 2 years pro-rata for automotive & marine applications.
    - Amptron - I just found this website tonight, they make a 36V 100Ah for $2495, significantly cheaper than Enerdrive With 4 years warranty. Iíll give them a call next week, has anyone had an Amptron LiFePO4 battery?

    I was planning on connecting 12V batteries in series to get 36V but what Iíve learnt after a few days of calling manufacturers is that mixing & matching these batteries wonít provide the best result, Buy the battery to suit the application. (have a look at the Enerdrive website as they have a good explanation of why they say that). The price has almost scared me back to AGM batteries, but with a total weight over 100kgs Iíll probably break the piggy bank open.

    If anyone has run a 36V 100Ah single battery on a 112lb minnkota Iíd be interested to hear how long it lasts in an offshore spot lock situation. The calculations based on the maximum 52amp current draw gives just under 2 hours, but I doubt they draw maximum current very often & therefore should last quite a bit longer in the average operation.

  3. #33

    Re: Help with electric motor battery selection and charging

    Quote Originally Posted by Heliduck View Post
    Great info in this thread, like others Iím researching LiFePO4 batteries for a 36V minnkota. What Iíve been told to date differs a little from what a few other people have done -
    - Itech - I spoke with a technician who told me that they only make up to 24V as their BMS displayed cell instability above that voltage. They didnít consider the 36V market big enough to justify the research & development to resolve this so they didnít bother. Their internal BMS wonít allow for connecting batteries in series according to him.
    - victron donít make a 36V & donít recommend connecting multiple batteries in series.
    - Enerdrive make a 36V 100Ah , RRP $5600 but their distributors could give a discount on that(Keoughís Marine have them for $4995). Developed specifically for the minn Kota market apparently, looks like a good battery but BIG $$$!!! 2 years warranty + 2 years pro-rata for automotive & marine applications.
    - Amptron - I just found this website tonight, they make a 36V 100Ah for $2495, significantly cheaper than Enerdrive With 4 years warranty. Iíll give them a call next week, has anyone had an Amptron LiFePO4 battery?

    I was planning on connecting 12V batteries in series to get 36V but what Iíve learnt after a few days of calling manufacturers is that mixing & matching these batteries wonít provide the best result, Buy the battery to suit the application. (have a look at the Enerdrive website as they have a good explanation of why they say that). The price has almost scared me back to AGM batteries, but with a total weight over 100kgs Iíll probably break the piggy bank open.

    If anyone has run a 36V 100Ah single battery on a 112lb minnkota Iíd be interested to hear how long it lasts in an offshore spot lock situation. The calculations based on the maximum 52amp current draw gives just under 2 hours, but I doubt they draw maximum current very often & therefore should last quite a bit longer in the average operation.
    A bit more info for anyone who is interested -
    I spoke to Amptron regarding their battery, it doesnít 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, canít argue with the price of $2495 for the battery. I questioned them on quality as Iím 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.
    - ďSealed Performance BatteriesĒ 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 theyíre very similar quality batteries. Watch this space as I havenít decided yet, my wallet says to buy Amptron but a poor man pays twice. With Amptronís 4 year warranty it might
    be worth the risk.

  4. #34

    Re: Help with electric motor battery selection and charging

    On a boat I think I would prefer a hardwired monitor, the preoccupation with bluetooth these days somehow doesn't compute with me as BT devices are power hungry things themselves. All good info above, watching with keen interest on choice of battery.

  5. #35

    Re: Help with electric motor battery selection and charging

    Been 6 months, any updates? Keen to read some reviews.
    It has always been my private conviction that any man who pits his intelligence against a fish and loses has it coming. ~John Steinbeck

  6. #36

    Re: Help with electric motor battery selection and charging

    id be pretty keen to see what you think as well

    Moose

    Marine outfitting solutions
    www.moosemarine.com.au

  7. #37
    Ausfish Silver Member GAD's Avatar
    Join Date
    Mar 2006
    Location
    Gordonvale

    Re: Help with electric motor battery selection and charging

    Been trying to get back on for some time , interweb . I have 2 x 120hr V- Giant lithium batteries and have run them for 10 hrs in a heavy current and weather , before the motor stopped and would only stow . came home and charged them up and went out 3 days later and used them all day . I have a victron charger and it does the job , I cut the clips off and put a 50 amp anderson plug and made a extension into two so as to be able to charge one battery at a time or both at the same time . I just split the two batteries with a 50 amp circuit breaker , which I allows me to isolate the batteries for charging .
    From the batteries there is a isolator switch and then a 60 amp circuit breaker before the cable to an anderson plug connection to the Minn Kota .
    Give a man a fish and feed him for a day , teach a man to fish and feed him for life .

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