Hi, I am looking to charge 52V / 20Amps lithium batteries with solar panels. How many solar panels will I need?
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Originally posted by Ebike View PostHi, I am looking to charge 52V / 20Amps lithium batteries with solar panels. How many solar panels will I need?MSEE, PE 
How fast do you want to recharge them ? More panels = faster chargingPowerfab 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 SO59 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/LMRSolar
gen: http://tinyurl.com/LMRListerComment

Originally posted by Ebike View PostHi, I am looking to charge 52V / 20Amps lithium batteries with solar panels. How many solar panels will I need?
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I assume you have an EBike 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; 02162017, 03:56 PM.MSEE, PEComment
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