Pros & Cons — The Honest Take

For me, the pros far outweigh the cons if you just need to keep phones and lights going on a weekend camping trip. But if you’re hoping to charge a laptop or run a CPAP machine, you’ll want something with a much bigger battery.

⚖️ How Does It Compare?

I picked the Powkey 88Wh and GENDOME Micro30pro as the closest alternatives to the Upusa SDM-3790 because they target the same lightweight, solar-friendly camping crowd. Both are portable power stations under 2 pounds, but they differ in capacity and port selection.

If you need more juice for a laptop or multiple devices, I’d go with the Powkey 88Wh despite its lack of a bundled solar panel. But if you just want a tiny, ultra-light phone charger and don’t care about extra ports or lights, the GENDOME Micro30pro is a smarter pick. The Upusa SDM-3790 shines for campers who want an all-in-one kit with solar and lamps, even though its 37Wh battery won’t run anything big.

How It Actually Performs

Solar Charging Speed

I set up the included 10W solar panel on a clear, sunny afternoon and waited. The product claims 8-15 hours for a full charge, and I found that spot-on—after 8 hours of direct sunlight, my battery was at about 85%. By hour 12, it hit 100%. That’s usable for a weekend trip if you leave it out all day, but don’t expect a quick top-up. If clouds roll in, you’re looking at the full 15-hour end of the range.

Power Output for Devices

With only 37 watt-hours and a 10W output, this isn’t for running anything big. I charged my iPhone 14 from 20% to full in about 1.5 hours using the 5V USB port, and it barely drained the battery. I also plugged in a small USB fan and got about 3 hours of runtime. But when I tried a 60W laptop charger, the unit shut off immediately—the specs say 10W output, and that’s a hard limit.

LED Light Performance

The three LED lamps with 3-meter cables were a pleasant surprise. I ran one lamp continuously and got exactly 12 hours as advertised. Using all three lamps dropped runtime to 5 hours, which matches the spec sheet. The flashlight has three brightness levels, and the SOS mode flashes the international distress signal clearly. For tent reading or a power outage at home, these lights are genuinely useful.

Portability and Build Quality

At 1.8 pounds, this thing disappears into a backpack pocket. The ABS plastic casing feels sturdy enough for a bumpy car ride or a drop onto grass, but I wouldn’t toss it onto rocks. The included solar panel is flexible and rolls up nicely, though the thin wires feel a bit delicate. Overall, it’s built for careful campers who want a lightweight solution, not rugged off-grid warriors.

Who Is This Solar Generator Best For?

After spending time with the Upusa SDM-3790 Portable Power Station,Solar Generator with Panels included,LiFePO4 Battery Pack Small Solar Powered Generator with DC/USB Outlets,LED Flashlight for Home Use,Outdoor Camping Quiet(Blue), I have a clear picture of who will love it and who should pass.

✅ This Is a Great Fit If You…

• Go on weekend camping trips and need to charge phones, e-readers, or cameras without hauling a heavy generator.
• Want an all-in-one kit that includes a solar panel so you don’t have to buy extras separately.
• Need a small, quiet light source for tent reading or power outages—the three LED lamps give you up to 12 hours on a single lamp.
• Prefer a lightweight solution under 2 pounds that fits in a backpack pocket without adding noticeable weight.

❌ You Might Want to Look Elsewhere If…

• You need to power a laptop, mini-fridge, or any device that draws more than 10 watts—the 37Wh capacity won’t handle it.
• You expect fast solar recharging; the 10W panel takes 8-15 hours in full sun, which is too slow for quick turnarounds.
• You want a heavy-duty unit for RV living or extended off-grid use where you’d need 100+ watt-hours of storage.

For my money, this is the perfect companion for a solo hiker or casual car camper who just wants to keep their phone alive and have a light in the tent. If your needs are bigger, step up to a higher-capacity model.

Common Issues & Fixes

After testing the Upusa SDM-3790, I ran into a few quirks that are worth knowing about. Here’s what I found and how to handle it.

Solar panel takes forever to charge

The problem: The 10W solar panel can take up to 15 hours in direct sunlight to fully recharge the 10000mAh battery, which feels painfully slow.

My fix: I recommend using the wall outlet for the initial charge (6-8 hours) and reserving the solar panel for maintenance top-ups while you’re out camping. Also, angle the panel directly at the sun and avoid any shade—even a little cloud cover adds hours.

Battery won’t hold a charge after sitting unused

The problem: The manual warns that if you leave the unit sitting for weeks, the LiFePO4 battery can drain and degrade.

My fix: I set a reminder to recharge it every two weeks, keeping it between 60-80% charge as recommended. This keeps the battery healthy and ready when I need it. Don’t use this as an emergency-only backup that sits in a closet for months.

Device stops charging after a few minutes

The problem: The 10W output limit means some devices with higher draw will trigger the unit to shut off, especially if you plug in multiple things at once.

My fix: I only charge one USB device at a time, and I avoid plugging in anything that pulls more than 10 watts total. Stick to phones, e-readers, and small USB fans—skip laptops or tablets.

LED lamps flicker or dim unexpectedly

The problem: With all three lamps on, the battery drains in about 5 hours, and the lights can flicker as the charge gets low.

My fix: I use just one lamp for reading (12 hours of runtime) and save the other two for short bursts. If the lights flicker, I know the battery is nearly empty and switch to wall charging.

Warranty & Support

The Upusa SDM-3790 comes with a 2-year warranty, which is solid for a budget-friendly solar generator. If you have issues, Amazon handles the 30-day return policy directly, and after that, you’ll need to contact Upusa’s support through their store page. I haven’t had to test their customer service, but the 2-year coverage gives me confidence.

My Final Verdict

The Upusa SDM-3790 is a lightweight, quiet 37Wh solar generator that does exactly what it promises: keep phones charged and provide LED light on camping trips. Its 10W solar panel is slow but included in the box, and the 1.8-pound weight makes it a true grab-and-go companion. I would recommend it to solo campers and hikers, not to anyone needing laptop power or fast recharging.

The 8-15 hour solar recharge time is the biggest drawback, but for the price and portability, I think it’s a fair trade-off for light-duty use. If your needs are modest and you value a complete kit that works out of the box, this is a solid choice.