Guide to Portable Solar Generators/Power Stations

Updated on April 3 2019 to reflect the latest prices and product information.

Rockpals 250W Portable Generator (Battery Pack)

 

GOOD AT MANY THINGS, GREAT AT NONE
Known by various names — portable solar generators, portable power stations, portable generators, power banks — these devices feature impressive versatility. In addition to a regular AC power outlet, they are chargeable from solar panels (where the term “solar generator” comes from) and car cigarette sockets. Many have pass-through charging capability (able to charge and provide power simultaneously) and come with USB ports, flashlight lamps, and sometimes even cables for jump-starting a drained car battery.

Still, these are not “generators” in the true sense of the word —  they are simply large power banks that can be charged various ways (solar, car, wall outlet). That’s why our preferred name for them is “portable power stations”, a name that suggests they are one rank in size above power banks, which are primarily intended for mobile devices.

SUMMARY

Comparison of Top Products Available as of April 2019.

 

Compact


 Startostar Portable Generator

 Medium 1

Rockpals Portable Generator

Medium 2

LNSLNM Portable Generator 
Large 1

Suaoki Portable Power Generator
Large 2

MAXOAK Portable Power Station

Watt-hour (WH)  178WH  250WH  288WH  444WH 400Wh
Price ($/WH) $150 ($0.84/WH)  $220
($0.88/WH)
$270  ($0.94/WH) $360 ($0.81/WH) $359 ($0.90/WH)
Maximum output (W) 150W
(250W peak)
 250W
300W peak
500W rated
1000W peak
300W rated
600W peak
 300W max.
Size  7.3 x 4.3 x 5 inches  8.9 x 3.9 x 6.3 inches  11 x 4.3 x 5.2 inches  9 x 5.5 x 9 inches  9 x 5.7 x 11.2 inches
Weight 3.86 lb  5.95 lb 8.15 lb 12.25 lb  12.3 lb
Charge time (outlet) 8 hours 7-8 hours   N/A 7 hours  7.5 hours
Solar panel input  13V-24V, 2.1A Max, Up to 100W 18V with DC 5.5*2.5mm MC4 connector 12V-18V (18V is ideal)/Up to 100W 14V-40V/10A (Max.) 14V-40V/Max. 10A
Purchase info  

SELECTING THE BEST PORTABLE POWER STATION

– First, decide how many watt-hours (WH) you’ll need and can afford ($0.81 to $0.94 per WH).
– Next, decide what devices you’ll need to power and add the total estimated wattage (maximum output (W)).
– Then, take into consideration the size, weight, and other features (USB ports, flashlight, solar panel voltage input range, etc.).

Read more below to find out more about our selection criteria and recommended applications for portable power stations.

High Capacity in Lightweight, Compact Design
Comparing Watt-Hours (WH)
Not a Replacement for Gasoline Generators
Gas Generator vs. Portable Power Generator
Solar and Car Charging
Pass-through Function

HIGH CAPACITY IN LIGHTWEIGHT, COMPACT DESIGN
Typically powered by lithium batteries, these portable power stations pack large amounts of power into a lightweight and compact size, especially compared to the heavy and large footprints of devices using lead acid batteries like uninterruptible power supply (UPS). The tradeoff for these features is a higher cost, but many new and similar products are continually being launched, resulting in competitive prices. These products are ideal for brief power outages or camping when a charging source is unavailable for a short time.

COMPARING WATT-HOURS (WH)
Portable power generators express their capacity as watt-hours (WH), where 1 WH means that 1 watt is used for 1 hour.

For a portable power generator of 300WH, theoretically, a laptop running at 40W would have enough power for 7.5 hours (40 x 7.5 = 300). Tablets and cell phones typically use 3W to 6W, and so you’d get between 50 to 100 hours of power for a single device.
Don’t be foolish and plug in a power-hungry heating device. Assuming even that the auto power-off function of the portable power generator is not activated, you could use up your stored power in less than an hour. For example, a typical electrical blanket at 200W would use the power of the 300WH generator in only 1.5 hours. Then, the generator would need to be recharged (taking about 7 hours usually), but if it has pass-through capability, you can still use it while charging.
Refer to this page for the wattage of typical household appliances, or you can use the Kill a Watt electricity usage monitor to measure your actual usage patterns at home to better plan for what to use in an outage.

NOT A REPLACEMENT FOR GASOLINE GENERATORS
But don’t get rid of your gasoline generator yet! These portable power stations CANNOT fully replace a gasoline generator.
To see what we mean, let’s compare the Honda EU1000i (model with inverter for providing safe power to your electronics) with the high-end Suaoki Portable Power Generator.

GAS GENERATOR VS. PORTABLE POWER GENERATOR

 
Honda EU1000i Gas Inverter Generator

Suaoki Portable Power Generator
Maximum Power Output 1000W/8.3A  300W continuous (2.5A)
600W surge (5.0A)
Run Time 2490 WH based on:
5 hrs at 1/2 load (4.15A) on 0.5 gal of gas
400 WH (444 WH rated) 
Other Advantages – Can run high-load appliances such as refrigerators (max. 8.3A), hair dryers, coffee pots, etc.
– If gasoline is readily available, it is quick and easy to “recharge” (=refill) this generator compared to the 7 hours needed to recharge the portable power generator
– Inverter provides stable power supply for sensitive electronic devices
– Extremely low noise (sometimes slight buzzing or fan sound)
– Lightweight (only 12.35 lb vs. 46.5 lb dry weight of gas generator)
– No worries about gasoline spoiling, oil changes, and other maintenance
– Can be used inside, whereas the Honda gas generator MUST be used outside due to danger of carbon monoxide poisoning
 Price (Subject to Change) $809

$360

As you can see, with a half-gallon of gas, the Honda EU1000i Gas Generator provides (120V outlet) total supplied power of 2,490 WH (1/2 load), which is about 6 times as much power as a fully-charged Suaoki Portable Power Generator, and the maximum power output of the Honda EU1000i Gas Generator is 3 times that of the Suaoki Portable Power Generator (1000W vs. 300W). Then, you need 7 hours to recharge (from wall outlet) the power generator, longer if you are drawing power from it while charging or using solar power.
The higher power output means that a gas generator can run your refrigerator (typically rated 540W), heating appliances (typically 100W or more), and still have capacity to spare. By contrast, the portable power generator is intended for electronics and low-power devices, and so you’ll have to ration your power in an outage.
From my experience, the portable power stations are convenient for short power outages, but you’ll still need a gas generator for extended power outages. Or best of all, combine the two by using multiple portable power stations within the house and then recharging them periodically with the gas generator. (However, if you are considering this option, you may want to consider installing a natural gas generator in your home. Costs typically start from $5,000.)

SOLAR AND CAR CHARGING
Although charging from solar panels or your car is not ideal, this could be useful for camping or as a backup option.

Most portable power stations have a range of accepted input voltages from solar panels or a recommended voltage. Check that your solar panels match this range and you have the required connector, or better yet, purchase your solar panels from the same manufacturer as your portable power station for ensuring full compatibility and connectivity.
For example, Suaoki sells solar panels in addition to portable power stations.

PASS-THROUGH FUNCTION — Not Recommended for Use as Full-time UPS
Although many of these portable power stations have a pass-through function which enables use as a UPS, you’d be foolish to use it as your full-time UPS. For example, the Aeiusny Portable Generator and similar models feature 155 WH (watt-hours) of power and have this pass-through function, but for a similar price you can get a UPS like the Tripp Lite 1500VA UPS Battery Pack with about 70 WH. Although this UPS has less WH than the portable generator, it is packed with UPS-specific features such as LCD screen with power monitoring, surge protection, and more. Plus, the battery in a UPS can be replaced (typical lifespan is 2 to 3 years) for about $20-$25, which will save you money in the long run. The batteries in portable power stations CANNOT be replaced, and that’s why these are more suitable for occasional use, instead of the daily charging and draining that would occur as a UPS.

Instead, the pass-through function is best for situations where you need to charge your power station and also draw power at the same time, such as when camping or during an outage when you have access to a single source of power (solar, car, or electric power).

MORE ANALYSIS
If you want something more portable (such as a size that will fit in a backpack, see our analysis of portable external batteries for gaming (high-performance) laptops.

To share any information with us, feel free to contact us.

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