Opinions on this panel

SystemSystem Posts: 2,511 admin
There tech support told me I would not need a charge controller due to the low amperage. This is for charging a 12V battery while camping.
40w Solar Panel/Blocking Diode/2m Cable/Clamps Battery Charger Kit Package Includes

One 40 Watt Monocrystalline Solar Panel
One Blocking Diode Cable
One 2-Meter Long Charging Cable with Clamps

Product Description This solar panel generates free electricity by charging under sunlight during daytime for use with house, RV, boat, yacht, car, camping, as well as many electronics such as laptop, stereo, television, radio, fan, outdoor lighting. The solar panel and the cables included construct a complete battery charger kits.

Made of monocrystalline PV -- the most energy efficient material
An extra blocking diode cable prevents reverse current flowing from battery to solar panel during night-time
An extra two-meter long cable with clamps provides the easy connection to batteries or electronic devices
Low voltage-temperature coefficient enhances high-temperature operation
Exceptional low-light performance and high sensitivity to light across the entire solar spectrum maximize yearly energy delivery
High quality, high-transmission tempered glass provides enhanced stiffness and impact resistance
Advanced EVA encapsulation system with triple-layer back sheet meets the most stringent safety requirements for high-voltage operation
A sturdy, anodized aluminum frame allows modules to be easily roof-mounted with a variety of standard mounting systems
Ultra reliable bypass diodes prevent damage through overheating due to shaded or defective calls
Output power tolerance of +/-3%
25-year limited warranty on power output
Manufactured in an ISO9001:2000 certified plant
CE certified
Dimension 26.3inx22.6inx1.57in (668x575x40mm)
Maximum Power (Pmax) 40Watts
Maximum Power Voltage (Vmp) 17.5V
Maximum Power Current (Imp) 2.29A
Open Circuit Voltage (Voc) 21.5V
Short Circuit Current (Isc) 2.58A
Temperature Coefficient of Isc 0.06% / degree C
Temperature Coefficient of Voc -0.397% / degree C
Temperature Coefficient of Pmax -0.549% / degree C


  • CariboocootCariboocoot Banned Posts: 17,615 ✭✭✭
    Re: Opinions on this panel

    Depending on the size of the battery you may not need a charge controller. Given a small battery, however, 2 Amps can be a lot of current. Another factor is how much power is being drawn out while the panel is trying to put power in. In that sense it may not be enough. But if you're going to use it to recharge a 100 Amp hour battery during the day so you have electric at night, it is probably not a worry.

    Unless the words "harbour" and "freight" are connected with the panel. :roll:
  • nielniel Solar Expert Posts: 10,300 ✭✭✭✭
    Re: Opinions on this panel

    even if going to a 100ah battery that approximate 2a could eventually overcharge even that battery. play it safe with a small cheap cc. this will allow less maintenance too as less water would need to be added and would allow a good absorb charge.
    here is an example controller,

    also note that only one blocking diode would normally be needed in a direct connection. i am a bit confused by your stating they are blocking diode cables. does that mean they premount a diode inside a cable run?
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