SLD TECH ST-50Q-12 50W 12V Monocrystalline Solar Panel

Last price we saw

$119.95at BatteryStuff.com, last seen Nov 8

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Our take on the SLD TECH ST-50Q-12 50W 12V Monocrystalline Solar Panel

The SLD TECH ST-50Q-12 is a 50 W monocrystalline solar panel rated at 12 V nominal, with 17.2 V at maximum power and 2.91 A of current. It measures about 24 x 19.3 x 1.2 inches and is built for off-grid charging: RV batteries, boat house banks, sheds, fences and small 12 V systems. Its 20.23 V open-circuit voltage suits a basic PWM charge controller, and the 1,000 V DC system rating allows series strings. No current price was provided for this listing, so check the live comparison before buying.

Best forRV and camper battery maintenanceBoat and marine trickle chargingOff-grid sheds, gates and fencesSmall 12 V solar setups with a PWM controller

Pros

Monocrystalline cells give solid output for a compact 50 W panel
17.2 V Vmp leaves headroom for a PWM controller charging a 12 V battery
20.23 V Voc and 3.09 A Isc are clearly specified for sizing a controller
1,000 V DC system rating allows series wiring for larger arrays
Wide -40 °C to 85 °C operating range suits exposed outdoor mounting

SLD TECH ST-50Q-12 50W 12V Monocrystalline Solar Panel prices at every store

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SLD TECH ST-50Q-12 50W 12V Monocrystalline Solar Panel price history

Lowest price we've seen: $119.95 on Nov 8 at BatteryStuff.com. Tracked across 1 store since Nov 8.

Specifications

Dimensions (LxWxH): 24.02 x 19.29 x 1.18 in
Maximum Power (Pmax): 50 W
Voltage At Pmax (Vmp): 17.2 V
Current At Pmax (Imp): 2.91 A
Open-Circuit Voltage (Voc): 20.23 V
Short-Circuit Current (Isc): 3.09 A
Operating Temperature

Questions and answers

What can a 50 W panel like this actually charge?: At 2.91 A peak it can maintain a 12 V battery or run small loads like lights, a pump or a gate opener. It will not meaningfully charge a large depleted bank on its own; plan on several panels or a bigger array for that.
Do I need a charge controller?: Yes for any battery. The 20.23 V open-circuit voltage exceeds what a 12 V battery should see, so use at least a PWM controller rated above 3.09 A. An MPPT controller will harvest more in low light.
Can I connect several in series or parallel?: Yes. The 1,000 V DC maximum system voltage allows series strings, and identical panels in parallel add current. Keep panels of the same model and orientation together for best results.
How big is it and how do I mount it?: It measures about 24 x 19.3 x 1.2 inches, so it fits many RV roofs and rail mounts. Mounting brackets and cabling are not included, so budget for Z-brackets and UV-rated wire.
How much power will it make on a cloudy day?: Expect a small fraction of the 50 W rating in heavy overcast, and near zero in shade. Angle it toward the sun and keep cells clean to get close to the rated output at midday.

Our take on the SLD TECH ST-50Q-12 50W 12V Monocrystalline Solar Panel

Best forRV and camper battery maintenanceBoat and marine trickle chargingOff-grid sheds, gates and fencesSmall 12 V solar setups with a PWM controller

Pros

Monocrystalline cells give solid output for a compact 50 W panel
17.2 V Vmp leaves headroom for a PWM controller charging a 12 V battery
20.23 V Voc and 3.09 A Isc are clearly specified for sizing a controller
1,000 V DC system rating allows series wiring for larger arrays
Wide -40 °C to 85 °C operating range suits exposed outdoor mounting

Questions and answers

What can a 50 W panel like this actually charge?

At 2.91 A peak it can maintain a 12 V battery or run small loads like lights, a pump or a gate opener. It will not meaningfully charge a large depleted bank on its own; plan on several panels or a bigger array for that.

Do I need a charge controller?

Yes for any battery. The 20.23 V open-circuit voltage exceeds what a 12 V battery should see, so use at least a PWM controller rated above 3.09 A. An MPPT controller will harvest more in low light.

Can I connect several in series or parallel?

Yes. The 1,000 V DC maximum system voltage allows series strings, and identical panels in parallel add current. Keep panels of the same model and orientation together for best results.

How big is it and how do I mount it?

It measures about 24 x 19.3 x 1.2 inches, so it fits many RV roofs and rail mounts. Mounting brackets and cabling are not included, so budget for Z-brackets and UV-rated wire.

How much power will it make on a cloudy day?

Expect a small fraction of the 50 W rating in heavy overcast, and near zero in shade. Angle it toward the sun and keep cells clean to get close to the rated output at midday.