Portable 56 VDC EGO Battery Charger Project



  • I stand corrected! Keep me posted for sure then! :)



  • @PixelPusher
    Absolutely the 7.5 amp hour model will have more available power. If you already have it for the mower (I am keeping an eye on that 21inch mower as well) then it should make a great power source if it matches the requirements of the attached load (motor). What does the motor require for voltage and max amps?



  • @LidPhones I have not gotten that far yet. I have some learning to do and I just got started with gathering sources. Finding online calculators that get me close, but knowing that i need to understand the math myself. I am brand new to both the idea of DYI and electronics. My only experience is building a guitar pedal from a kit so far ;) Total newbie at this point. I do have the mower and battery though.



  • @slydogstroh is using a chafon of amazon says he gets about 3 charges out of it and its about 20 dollars cheaper than the set up you have planned



  • @jew_fro_1009
    I was reviewing that solution too but have the EGO battery already and was looking for a more compact solution. We will see how it turns out and if the value is compelling enough for others. I should have initial results back this weekend once built.



  • @LidPhones if this works, I did see the bare battery and BMS for the 7.5 ah battery configuration on one of the Chinese sites somewhere. Samsung cells too. http://www.globalsources.com/gsol/I/Lithium-ion-battery/p/sm/1145347243.htm#1145347243



  • @LidPhones said in Portable 56 VDC EGO Battery Charger Project:

    @jew_fro_1009
    I was reviewing that solution too but have the EGO battery already and was looking for a more compact solution. We will see how it turns out and if the value is compelling enough for others. I should have initial results back this weekend once built.

    I'm all for compact and light! I want the smallest and lightest (yet still functional) design period... that doesn't involve a bunch of loose cables and janky connections to get disturbed in a backpack. If we can simply find/settle on the best compact/light battery that has enough juice to fully charge one OW (once) through a solar charger or otherwise, I can probably design a shell to house the whole thing together...



  • @kevinrwhitley

    We are both on the same path for a reliable solution. I will be 3D printing the interface in a nylon material that will hold the MPPT and secure the EGO battery / contact terminals with XLR plug.



  • @LidPhones sounds perfect!



  • @LidPhones

    I have a working setup just like what you are envisioning, except I'm using my three 40v 95 WH Ryobi batteries that I have laying around for my mower and weed eater.

    The 95 WH battery will get me 60% charge in under 20 minutes.

    I picked up some alligator clips and soldered them to the adapters. I just clip them on and bingo.

    There is a higher capacity 5 ah version of this battery that is the same weight, only 3.5 lbs, which will have to get over one charge. $140

    http://m.homedepot.com/p/Ryobi-40-Volt-Lithium-Ion-5-Amp-Hour-High-Capacity-Battery-OP4050A/206481601

    The thing I like about this solution is the BMS is built in and they are tough as nails and come with a warranty.

    My solar charger fits perfectly inside a dakine GoPro soft case.



  • @jew_fro_1009
    I just got my Chafon battery back up,I got 2 full charges on my OW from 1% to 100%.
    Love it.



  • Initial results = Two charges from the EGO 5AH battery and MPPT. Need to fine tune the MPPT setting to optimize charge performance. 1st charge was from < 1% to 100%. 2nd charge was from <1% to 95% (some MPPT issues for OW to start charging, will sort these out and update).

    Next step is to design and 3D print the slide on battery interface tray which will hold the MPPT and wires/terminals (Yazaki blade terminals used). Overall this seems to be a very compact and powerful solution for the 58 VDC 2.17AH battery (should get two full charges from 5AH).



  • @LidPhones great work!



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