Can these solar panels be run in series? If so, what is the maximum number of panels I can connect in series?

The maximum number depends on your solar charger. It will list a maximum voltage. Look at the specs and see what the open circuit voltage of the panel is. Then look at your battery charger for the max solar input voltage. It can range quite a bit, so it is very important. Divide the maximum voltage for the charger by the open circuit voltage of the panel. The whole number will be the max number of panels. For instance - If the max input for the charger is 150V and the panel will output 52V open circuit, 150/52 = 2.88. The maximum series panels would be 2. 2 x 52 - 104. As long as that number is at least 20V higher than your battery voltage, you should be golden. Also, look at the short circuit amps to make sure you are under the max current for the charger if you hook your panels in parallel. Series panels add voltage. Parallel panels add current.

Can this do a parallel or serial connection with the ecoflow solar panels?

The working voltage of this solar panel is 18V, which is suitable for your power station. The parallel voltage is unchanged, and the MC4 parallel connector is required. The series voltages are added.

What's the average power output? Seeing most people post between 78-100w. My battery can take up to 200w, wondering if I can hook up 2 of these?

I’ve gotten between 102-95 on mine and yes you can connect two. You would need to buy a Y connecter set.

Will this work with an ebl 300 watt?

The working voltage of the solar panel is 18V, if the power station accepts 18V solar charging, it will be adapted.

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ALLPOWERS SP001 21W Portable Solar Panel Charger

ALLPOWERS SP001 21W Portable Solar Panel Charger

Product ID: 283392741

Details

Brand
ALLPOWERS
Efficiency
High
Included Components
Screw
Material
Silicon ETFE
Product Dimensions
8.66"L x x

⚡21W peak power for rapid charging

💧Waterproof & durable nylon build

🔌Dual USB-A & USB-C outputs (5V/3A each)

€ 88.46

Duties & taxes included

In stock

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Description

☀️ Charge Ahead: Power Your Adventures with Portable Solar Brilliance!

SAFETY FIRST TECH - Advanced short circuit and surge protection keep your devices and you safe during every charge.
SUN POWERED SPEED - Harness 21W peak power with industry-leading 25% efficiency for faster, reliable charging anywhere.
COMPACT POWERHOUSE - Folds down to a sleek, lightweight package with an integrated handle—perfect for on-the-go professionals.
BUILT TO BRAVE THE ELEMENTS - Waterproof, rugged nylon design with FCC, RoHS, and CE certifications ensures durability on every adventure.
UNIVERSAL DEVICE COMPATIBILITY - Dual USB-A and USB-C ports deliver 5V/3A each, charging phones and gadgets effortlessly off-grid.

The ALLPOWERS SP001 is a foldable 21W portable solar panel charger featuring high-efficiency monocrystalline silicon cells with 25% conversion efficiency. Designed for durability and portability, it boasts waterproof nylon construction, dual USB-A and USB-C outputs (5V/3A each), and built-in safety protections. Ideal for camping, RV trips, and emergency backup, it delivers reliable off-grid power in a compact, lightweight form factor.

Specifications

ASIN	B0FFGZ3781
Best Sellers Rank	#31,247 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #140 in Solar Panels
Brand Name	ALLPOWERS
Customer Reviews	4.2 4.2 out of 5 stars (2,019)
Efficiency	High Efficiency
Included Components	Screw
Item Dimensions L x W x H	8.66"L x 8.18"W x 0.78"H
Item Highlight	Foldable Solar Kit with Dual USB Outputs for Camping, Phones, RV, Home, Outdoor, Balcony, Garden
Manufacturer	ALLPOWERS
Manufacturer Part Number	AP-SP-026-BLA-US
Material Type	Monocrystalline Silicon, Aluminum, ETFE
Maximum Power	21 watts
Model Number	SP001
Number of Items	1
Output Voltage	5 volts_of_direct_current
Special Features	Portable

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