Sizing portable PV system for daytime Electric Skateboard recharging

caruzer
caruzer Registered Users Posts: 3 ✭
in Solar Beginners Corner #1
Greetings,
I have an Evolve Skateboard.  It's listed as having 3000w of power (not sure if that refers to the motors or the battery).  More specifically, the battery is:  36 V / 10 Ah / 360 Wh / 10S

My charger/transformer outputs 42V at 2.0A

I am looking for a portable panel system that will allow me to charge it up during the day.  I don't need to store power to recharge at night.
What size system do i need?  I get lost in the weeds when trying to calculate.... 

thank you!
Michael
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    edited August 2018 #2
    2a@42v=84watts, so about 100w panel. The problem is the voltage. Most panels that size will put out ~18v, so you'd need a charge controller that can boost voltage to 42v, or a small 12v battery charged by the panel and small 12vdc to 120vac inverter to run the 42v transformer.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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  • caruzer
    caruzer Registered Users Posts: 3 ✭
    #3
    Thanks!  I have a few deep cycle Marine batteries.  and can grab an inverter.  Would a 100w panel provide enough to generate a full 120v current (like the house) to power the transformer? or would it drain the battery trying to keep up?

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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #4
    42V @ 2 A =  about 100 w allowing for 20% inverter losses.  At 12V, thats 8.4 amps.

    My suggestion:   Try a single 12V deep cycle battery, a Morningstar SureSine 300w inverter and  about 200w of panels and appropriate charge controller. 
    Powerfab top of pole PV mount | 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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  • caruzer
    caruzer Registered Users Posts: 3 ✭
    #5
     thanks Mike!
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