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  • Solar Panel for Lithium Batteries

    Hi, I am looking to charge 52V / 20-Amps lithium batteries with solar panels. How many solar panels will I need?

  • #2
    Originally posted by E-bike View Post
    Hi, I am looking to charge 52V / 20-Amps lithium batteries with solar panels. How many solar panels will I need?
    As many as it takes to give you 20 amps x 52 volts = 1040 watts. Panel voltage will need to be at least 64 volts.
    MSEE, PE

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    • #3
      How fast do you want to recharge them ? More panels = faster charging
      Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
      || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
      || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

      solar: http://tinyurl.com/LMR-Solar
      gen: http://tinyurl.com/LMR-Lister

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      • #4
        Thanks Sunking. Mike90250 we'd like to charge them in 4 hours.

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        • #5
          Originally posted by E-bike View Post
          Hi, I am looking to charge 52V / 20-Amps lithium batteries with solar panels. How many solar panels will I need?
          You have 1040 watt hour batteries. To charge them in 4 hours you will need ~260 watts. That's about 400-500 watts of panels after losses and realistic operating conditions. You will likely end up with two 72-cell panels, each about 250 watts. That will give you about 70 volts, which is what you'll need to run an MPPT charge controller.

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          • #6
            Originally posted by E-bike View Post
            Thanks Sunking. Mike90250 we'd like to charge them in 4 hours.
            Does not work that way with solar. You want a 4 hours charge rate. To do that you have to know the battery AH capacity. Example if it is 20 AH you need to charger that can supply 5 amps. Problem is even if that is a commercial AC charger takes 6 to 7 hours. There are not that many Sun Hours in a Day to do with solar.

            I assume you have an E-Bike Right? I also assume you are using either LFP or LiPo battery. If that is correct you want to charge at C/1 or C/2 with solar and in practice will take 2 to 4 hours to charge. So if you have a 20 AH battery will take 20 or 10 amps respectively.

            To do that on say a 52 volt battery the panel wattage required is easy to figure out. Charge Amps x Battery Voltage x 1.2 = watts using a MPPT Charger. So lets say 20 amps x 52 volts x 1.2 = 1248 watts with a 20 amp MPPT Controller. You are looking at a $2000 to $2500 battery charger. That wil getter done in 2 hours.

            Or you can do 4 hours for 650 watts of panels and a 10 amp MPPT charger will cost about half that and do the job in 4 hours.

            Hope you got lots of cash to go green. If it were me I would just buy a commercial charger for $50 and pay that mean ole POCO 1 cent to charge up in 2 hours.
            Last edited by Sunking; 02-16-2017, 04:56 PM.
            MSEE, PE

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