Solar Cell Large - 2.5W

Packaged solar cell with barrel plug termination. This is a custom cell produced for SFE - not a small toy surplus item! This unit is rated for 8V open voltage and 310mA short circuit. We actually took a random unit outside and measured 9.15V open voltage and 280mA short circuit. Under ideal sun conditions (high-noon, clear sky) 310mA is very possible but will vary from cell to cell. We can even get 110mA from inside our office windows!

Termination is a 5.5mm x 2.1mm barrel plug, center positive on a 2m cable. Monocrystalline high efficiency cells at 15-15.2%. Mates directly with many of our development boards. Unit has a clear epoxy resin coating with hard-board backing. Robust sealing for out door applications!

  • 7 x 4.5"

Solar Cell Large - 2.5W Product Help and Resources

Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

1 Electrical Prototyping

Skill Level: Noob - You don't need to reference a datasheet, but you will need to know basic power requirements.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • epocolis / about 14 years ago / 6

    I want to use this solar panel to charge batteries powering my arduino remote logging station, which battery charger and battery will this solar panel work well with ?

  • csloser / about 14 years ago / 3

    This weighs about 100 grams, not including the cord.
    There is no built in diode.
    I posted a voltage/current curve on the web page below but it's under artificial light so I don't know exactly what its peak output is in real sunlight. I would estimate somewhere around 1.5-2.0 watts.

  • Lutorm / about 9 years ago / 2

    A heads up for people planning to use this for permanent outdoor mounting: The epoxy coating is not UV protected. After 6 months outside in Hawaii, mine has become completely opaque. It's still functioning, but I have no idea how much power I'm losing.

    • Adzze / about 9 years ago / 1

      Seems odd that a product designed to be used in the sun is not protected against UV damage!

  • 1madvoid / about 11 years ago / 2

    Are there any chances of getting a data sheet for this? I would like to know the output impedance, IV curve, etc.

  • droll221 / about 14 years ago / 2

    Does anyone know how much this solar panel weigh? Thanks.

  • Member #469107 / about 10 years ago / 1

    I want to use this device for a college project, a robot follows lines, the design is based on a military tank and uses three photo-sensors on bottom. Do you think that this device produces enough energy to power the robot? the robot its smaller than 10cm by 10cm

  • ppDesigner / about 10 years ago / 1

    I have purchased 4 of this for an outdoor project. Will order 12 more if the product meets requirements...

  • Member #435508 / about 10 years ago / 1

    I recently bought this product, will it charge a 2200Mah 11.1V LiPo battery?

  • Ersatz / about 11 years ago / 1

    Hey Mike, I am thinking of using this to power a Power Cell - LiPo Charger/Booster sku: PRT-10300 can I do so without blowing up said charger booster or will I need some sort of 5v regulator and what would that do the performance of the output of the cell.

    • MikeGrusin / about 11 years ago * / 1

      According to the datasheet for the MCP73831 chip on the charger, the absolute maximum input is 7V. Which is a problem, because this panel can get up to 8V.

      You've got a couple options though. One is, as you say, running the panel through a 7805 before hitting the charger. You'll lose some efficiency (and voltage margin in low-light conditions), but sunlight is free and this is an easy fix.

      Another option is a simple zener shunt on the output of the panel. This circuit increasingly shorts power to ground if the voltage ever gets above 7V. I made one for exactly this purpose (this panel and this charger) out of a 6.8V zener and a small resistor. It does work; you lose a bit of power in the resistor, but not much.

      We've working on some solar-power products, but I wouldn't expect them to appear on the storefront before fall at the earliest. In the meantime, the above two techniques should help get your project off the ground. Good luck!

      • Member #416719 / about 11 years ago / 1

        How small resistor did u use? thx!

        • MikeGrusin / about 11 years ago / 1

          I believe it was 10 ohms.

          • Member #416719 / about 10 years ago / 1

            Two more questions :P What about using a large cap for filtrering and boosting the input to the charger? When will there be a line up with Sparkfun solar power products? :) thx!

  • Val_27 / about 11 years ago / 1

    can i use this panel with arduino uno?

  • Val_27 / about 11 years ago / 1

    can i use this panel with arduino uno?

  • Member #198101 / about 12 years ago / 1

    Is there a datasheet for this panel?

    • Kamiquasi / about 12 years ago / 1

      All of the relevant data should be in the product post - anything in particular you're looking for?

      • Member #198101 / about 12 years ago / 2

        Interested in the manufacturer's IV curve (I saw the user post above), ambient temp specs for operation etc...

  • Robert451 / about 12 years ago / 1

    From the picture, this cell looks blue. Is it really blue or is that just the lighting in the photograph?
    I am working on a robot project that involves a number of solar cells. I already have four of the "Huge" cells (PRT-09241). Those are black. I am now considering a couple of the "Large" cells (PRT-07840) for the same project, but it's only going to work for me if the "Large" cells are black like the "Huge" cells.

  • Xsterawesome / about 12 years ago / 1

    can i sand down the sides to 4.25 fit in a pelican case Micro Case 1060

    • Pearce / about 12 years ago / 1

      I'd be very careful as you don't know where the traces are.

  • Rockman / about 13 years ago / 1

    I'm looking for a solar cell/motor combo that can work and propel in sunlight, not one of these solar projects that quiver after charging a capacitor. Will this panel work and what motor works in combo w/it?

  • EllenSundh / about 13 years ago / 1

    I would also like to know how to charge a battery. I guess I need some kind o regulator when the battery is full.
    Thanks in advance!

  • Attie / about 14 years ago / 1

    I would also like to know about charging a battery using this cell...
    For now I will be using the Koala (PRT-08722) and the ~1Ah LiPo (PRT-00339)

  • swilly / about 15 years ago / 1

    Does this have a diode to protect from destroying the cells while charging a battery?

  • Gabe / about 15 years ago / 1

    Do you have the Power/Voltage curve for this panel? Do you know what the peak Voltage*Current is (Peak Power I guess?)?

Customer Reviews

4 out of 5

Based on 2 ratings:

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1 of 1 found this helpful:

Hey, this ain't too shabby

This is actually a really nice solar cell. I buy these over other cells available online, as they pack quite a punch for their size. Sparkfun, well done.

It works well

This panel worked as expected. I recommend it for lower power requirements!