Super Capacitor? | Solar & Wind Products; View Hundreds of Solar & Wind Products Here!

Super Capacitor?

Solar & Wind EBooks



So what is a super capacitor doing in my solar power system? This video will try to explain its purpose.

In short, it helps to supply the bulk of the inverter surge current when it tries to start loads with high starting current, like refrigerators or freezers, or air conditioners or dehumidifiers. Basically anything with a motor that starts up under load. Adding a bigger inverter would not help, as it is the load’s starting current that is the root cause.

I used a 250 farad, 16.2 volt capacitor bank made up of 6 – 1500 farad, 2.7 volt caps in series:

In series, the voltage adds and the capacitance drops.

Guy Brown (channel link in the right sidebar) has a video on adding a capacitor to his solar power system:

Likewise, ElRazTheGreat1 has a video on charging/discharging capacitors on his channel:

I think I’ll add a 200 amp breaker before my capacitors so I can disconnect/charge/discharge them easier in my final setup.

Unlike lead-acid batteries which can take 500 or so charge-discharge cycles, a super capacitor can handle a million or more cycles. So I hope this capacitor bank will out live many sets of batteries.

For an in-depth discussion of inverter surge current, be sure to check out KnurlGnar24’s channel over under the Featured Channel list in the sidebar, or the link below:

Note that the surge current only lasts a second or two.

My 5.5 watt LED test seems to back up the capacitor bank rating. Using C/2 x V^2 = Joules, I get 32805 joules or 9.11 watt-hours to a full discharge. Discharging to half voltage yields 3/4 of the stored energy, or the 5.5 watt-hours I observed.

Anyway, I hope this explains what a super capacitor is doing in my solar power system. If you have an inverter struggling to start up a load, you might consider adding one to your system.

Thanks for watching.

source

Share Button

5 Comments on "Super Capacitor?"

  1. TheOldmankk says:

    oh man, this is good for Winter Jump starting your truck.

  2. Ryan Fleur says:

    Hi, can i use a car audio capacitor ?

  3. Nev says:

    Hi. This is a very informative post. It's exactly the answer I've been looking for. I have a boat with a large household refrigerator as well as a large chest freezer. I have 3 x 200 ah batteries, and even though the household 'fridge draws only 16 amps whilst in steady state running, it trips the inverter low voltage (10.5v) cut-out during compressor start-up once the battery voltage drops to about 11.8v. This usually occurs at about 5 am when I'm trying to sleep! I'm going to use your system (I've sourced 6 x 2000f Caps from AliExpress) to hopefully eliminate this problem. The only mod I'm thinking of is to put a 200 amp diode before the caps to prevent them from back feeding into the 8.2 litre diesel starter motors during engine start. Engine start often trips the inverter low voltage cut-out, resulting in re-booting of computers etc connected to the inverter. I'm hoping the diode will prevent such low voltage trips of the inverter.

    Thanks for taking the time to post this. Any comments appreciated.

  4. hey sports fans. I think that you are on the right track with the super capacitors. my system consists of a couple of Outback VFXR3524A for a 7000 Watt Off-Grid system. I just received in the mail 24 Maxwell 2600 farad at 2.5 volts. My system is running on 24 volt battery. that means that I need 12 capacitors in series to give me a top voltage of 30 volts. with the protecting circuits added to it I I wined up with a 216 farad capacitor. I have 3700 amp hour a batteries in the system and my lights still Flickr when the inverter starts the refrigerator, washer, dryer, freezer, and air conditioner. I'm busy with making straps out of 1 inch X 1/8 inch copper bar to handle the Serge current. I am using 4 / 0 Gage welding cable for all my battery and inverter lines. ? Oh, I have 8500 watts of solar on the roof as well. I am looking forward to see if this is able to diminish or remove the light flicker when the different appliances startup. More information to follow.

  5. could I run two audio 5.0 fador capacitors in series ?


Energy Controllers

  • Recent Posts

  • Bring Your Old Battery Back to Life!


    Learn how to bring any battery back to life again



    Learn how to bring any battery back to life again


    Learn how to bring any battery back to life again




    Learn how to bring any battery back to life again

    Solar Generators



    Learn how to bring any battery back to life again

    Solar Converters



    Learn how to bring any battery back to life again

    Wind Turbine Power


    Wind Power Kits


    Aquaponics


  • Recent Comments


  • Learn how to bring any battery back to life again

    Solar Generators


    Solar Converters


    Wind Turbine Power


    Wind Power Kits


    Aquaponics



    Learn how to bring any battery back to life again


    Solar Converters


    Wind Turbine Power


    Wind Power Kits



    Learn how to bring any battery back to life again

    Aquaponics


  • Archives

  • solar power products