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Jackery [Add-on] 300 Plus Review
288Wh of storage, 120W continuous output, LiFePO4 cells. Listed at $399 at Jackery.
The Jackery [Add-on] 300 Plus is a portable 600 1,200wh unit holding 288Wh. At $1.39 per watt-hour it is priced above the median for the band, so you are paying a premium over comparable capacity. It uses LiFePO4 cells rated for 3,000 cycles, so it is built to be kept rather than replaced. This model is discontinued, so stock is whatever is left in the channel.
Manufacturer price at the time of writing. This link is not a paid placement.
Computed from this unit’s published specification, not from a manufacturer claim. Method and the full catalogue comparison are in our power station price index.
What the Jackery [Add-on] 300 Plus will run, and for how long
Runtimes below are calculated from the 288Wh rated capacity, derated to 85% for AC loads and 92% for USB and 12V loads to cover inverter and conversion losses. They are arithmetic, not lab measurements, but they are the same arithmetic applied to every unit we track, so the comparison holds. Anything drawing more than the 120W continuous rating is left off the list because this unit cannot carry it.
| Load | Estimated runtime |
|---|---|
| Phone charge (12Wh) | 22 charges |
| Wi-Fi router (10W) | 24 hr |
| LED work light (10W) | 26 hr |
| CPAP, humidifier off (40W) | 6 hr 7 min |
| Laptop (60W) | 4 hr 5 min |
| 12V portable fridge (45W avg) | 5 hr 26 min |
| 55-inch TV (90W) | 2 hr 43 min |
Real figures land below these. A fridge cycles rather than drawing continuously, and cold weather costs a lithium pack usable capacity, so treat the table as the ceiling rather than the expectation.
Charging and power delivery
Maximum solar input is 2,000W. At 70% of that rating, which is what a fixed panel realistically delivers across a good day, a full charge from empty is roughly 12 min of usable sun.
Jackery [Add-on] 300 Plus specifications
Manufacturer figures, gathered so you can read them against everything else we track rather than against the marketing page they came from.
| Capacity | 288Wh |
| Continuous AC output | 120W |
| Cell chemistry | LiFePO4 |
| Rated cycle life | 3,000 cycles |
| Weight | 8.3 lb |
| Max solar input | 2,000W |
| Warranty | 3 years |
| Price at Jackery | $399 |
| Cost per watt-hour | $1.39 |
How the Jackery [Add-on] 300 Plus compares
The closest units we track from other manufacturers in the same band, matched on capacity rather than on price.
| Jackery [Add-on] 300 Plus | ALLPOWERS S700 700W 606Wh | Pecron E600LFP 1200W 614Wh LiFePo4 | |
|---|---|---|---|
| Capacity | 288Wh | 606Wh | 614Wh |
| Output | 120W | 700W | 1,200W |
| Cycle life | 3,000 cycles | 1,000 cycles | 3,500 cycles |
| Weight | 8 lb | 12 lb | 20 lb |
| Price | $399 | $179 | $239 |
| Cost per watt-hour | $1.39 | $0.30 | $0.39 |
Where the Jackery [Add-on] 300 Plus sits in its band
We track 57 units in the portable 600 1,200wh band with both a price and a published capacity. They run from $179 to $3,449, and from 99Wh to 5,040Wh. On cost per watt-hour the Jackery [Add-on] 300 Plus ranks 55 of 57, where 1 is the cheapest capacity in the band. That puts it in the most expensive third, so it has to earn the difference somewhere other than raw capacity. Ranking on cost per watt-hour deliberately ignores build quality, port selection and warranty, so read it as one input rather than as the answer.
Alternatives to the Jackery [Add-on] 300 Plus
Units we track in the same band that are close enough to be genuine substitutes, matched on capacity. Each links to its own review.
- Jackery 300 Plus review — listed at $399.
- BigBlue CellPowa 600 review — listed at $369.99.
- Jackery Explorer 240 v2 review — 256Wh, 120W output, listed at $249, $0.97 per watt-hour, cheaper capacity than the Jackery [Add-on] 300 Plus.
- Jackery 240 v2 review — 256Wh, 120W output, listed at $349, $1.36 per watt-hour, cheaper capacity than the Jackery [Add-on] 300 Plus.
Who the Jackery [Add-on] 300 Plus suits
It is a sensible buy for weekend camping, a CPAP overnight, phones and laptops, and keeping a router alive through a short outage. It is the wrong tool for anything with a heating element, and any attempt to run a fridge for more than a day.
Jackery [Add-on] 300 Plus questions
How long will the Jackery [Add-on] 300 Plus run a fridge?
A full-size fridge averages about 50W once you account for the compressor cycling on and off. From 288Wh, derated to 85% for inverter losses, that is roughly 4 hr 54 min on a full charge. A 12V portable fridge draws less and will run considerably longer.
Can the Jackery [Add-on] 300 Plus be charged by solar?
Yes. It accepts up to 2,000W of solar input. Panels rarely hit their rated figure in the field, so plan on about 70% of the panel rating across a clear day.
What warranty does the Jackery [Add-on] 300 Plus carry?
Jackery covers it for 3 years, and rates the cells for 3,000 charge cycles. Cycle life and warranty are different promises, and the cycle figure is the one that tells you how long the pack stays useful.
Is the Jackery [Add-on] 300 Plus worth it?
At $399 it works out at $1.39 per watt-hour. It costs more per watt-hour than the median unit in its band, so the case for it rests on the features rather than on the price. Read the comparison table above against the two closest rivals before deciding.
How we assess these
Every figure on this page comes from the manufacturer, and every derived number, cost per watt-hour and estimated runtime, is calculated the same way for all 437 products we track. That is what makes the comparison meaningful: we are not scoring units against a private impression of them, we are putting published figures side by side and doing the arithmetic in public. Where a manufacturer stays quiet, we say so rather than filling the gap.