ROCKPALS 300W Portable Power Station

ROCKPALS 300W Portable Power Station

By ROCKPALS · Portable Power Stations · Audio & Electronics

  • 280Wh capacity
  • 300W rated / 500W peak output
  • 7.3 lbs (3.32 kg) weight
  • Pure sine wave AC output
  • 9 output ports total

Lowest price seen
~$249.90 (approx.)
from $249.90 at Amazon

Prices are snapshots. Check the current price with the store.

Summary

A 300W portable power station for camping and outages, but Rockpals has closed its doors and at least two very different units share the “300W” name. Check which generation a listing actually offers and whether the seller stands behind the warranty before you buy.

Strengths

  • PCWorld’s 2019 test found the older unit’s array of DC/AC/USB outputs practical for camper lighting.
  • The 2021 Rockpower 300 adds a 30W USB-C PD port and a slimmer body.
  • A The Hippie Geeks video from April 2024 reports a unit bought three years earlier still working after a Joshua Tree trip.
  • No gasoline engine: runs devices indoors without exhaust CO if ventilated and kept from water and heat.
  • Pure sine wave AC output suits sensitive electronics under 300W.

Weaknesses

  • Rockpals has closed; the original company stopped operations and warranty support is effectively gone.
  • Two different units share the “300W” name — listings often don’t say which generation you get.
  • PCWorld measured the 2021 unit shutting off a 4W desk lamp after about eight hours; low-load cutoff is intentional.
  • A July 2021 Van & RV Living Forum user reported their 300 dying after roughly two years of daily CPAP use.
  • The 2021 manual states AC output is unavailable while recharging, so it is not a true UPS.
  • 300W continuous cannot start or run appliances with higher surge or continuous draw; a 1,200W microwave tripped protection in PCWorld’s 2019 test.

Verified specifications

Battery280Wh lithium-ion (older 2018–2019 family) or 280.8Wh (2021 Rockpower 300 manual).
AC output300W continuous pure sine wave; seller claims 600W short peak on the older unit.
Older unit portsAC outlet, 12V cigarette-lighter socket, 24V/3A DC, three 12V/4A DC outputs, USB-A with QC 3.0, two LED flashlights, large LCD.
Newer Rockpower 300 portsone 110V AC socket, two 12V/60W barrel outputs, 12V car output, two 5V USB-A, one QC 3.0 USB-A, 30W USB-C PD, smaller LCD, no flashlights.
RechargingAC wall, car charger, optional solar; newer unit adds USB-C PD charging. PCWorld measured 4h 15m wall charge (2019) and 5h 5m at ~68W (2021).
Solar input18V / 60–100W on the older unit. A 100W panel took 6h 27m in full sun and over 12h with partial shade.
Usable energyseller’s formula is 280Wh × 0.85 / device watts. PCWorld measured 252.75Wh delivered (2021) and 92.10% of nominal capacity (2019).
Storage and temperaturerecharge at least every three months; operating range -10°C to 40°C; charging range 0°C to 40°C; AC output stops below about 10% charge.
Airline travelthe 280Wh pack exceeds the 100Wh carry-on allowance; the 2021 manual states it cannot be taken aboard an airplane.
Dimensions (older unit)7.48 × 5.9 × 5.5 in; 7.3 lb.
Warrantyolder seller listings advertise 24 months; some archived manuals show 12 months. Rockpals’ closure makes current factory coverage unverified.
Full research notes and sources

Which generation you are buying

ROCKPALS sold at least two substantially different portable power stations called “300W.” The older RP300W / MT-300 family has an angular case, front flashlights, a large display, multiple 12V/24V DC ports and no USB-C. The newer Rockpower 300 has a smaller body, USB-C PD, a smaller readout, one 110V AC outlet and a different DC port layout. Some current sellers reuse “Rockpals 300W” without an unambiguous factory part number. Demand actual photos of the ports, product label and included charger before purchase.

Battery life and running costs

The seller’s indicative AC runtime formula is 280Wh × 0.85 / connected-device watts — an assumption, not a certified efficiency curve. PCWorld’s 2021 reviewer extracted 252.75Wh (90.01% of his stated 289Wh) in a USB discharge test; the 2019 reviewer measured 92.10% of the older nominal 280Wh. Do not apply USB discharge results directly as an AC-outlet efficiency guarantee.

With 280–280.8Wh rated stored energy, one full recharge from a wall outlet each week would deliver about 14.6kWh/year into the battery nominally. At an assumed 80% wall-to-stored efficiency, wall energy would be about 18.3kWh/year, or $4.57/year at an assumed $0.25/kWh. One full charge daily at the same assumptions would be roughly $32/year. Neither the 80% efficiency nor current battery capacity was measured for an aged 2026 unit.

Support, warranty and parts

Rockpals-branded site rockpals.site states that “Rockpals has officially closed its doors.” A September 2026 specialist buying guide independently reports that the original company stopped direct operations and its original factory warranty backstop is effectively unavailable. Treat the legacy 12- or 24-month warranties on old seller descriptions as historical claims, not verified active manufacturer coverage.

The internal lithium-ion battery pack is fixed inside an enclosed case. No verified user-replaceable OEM pack, current manufacturer part number or authorized US service price exists. A seller advertises 500 cycles to 80% capacity for the old unit, but this is a rated claim, not measured to 500 cycles. Treat severe capacity loss as end-of-life unless a qualified battery repair service accepts it.

A July 2021 Van & RV Living Forum poster said Rockpals ignored two or three support messages about a failed charging cord and their unit eventually ceased working. A 2020 Reddit owner said support repeatedly gave incorrect responses about an MC4-to-rear-port adapter. These are individual accounts predating the closure, not a verified company-wide support success rate.

Is it worth it?

At below $75 used or open box with demonstrated measured capacity, a legacy Rockpals 300W may be defensible as noncritical hobby or camping equipment. At $75–$110, only with a strong return period and complete adapters. Over $110, a supported modern LiFePO4 alternative is the better buy.

Portable4Life advertised the older 280Wh unit at $249.90 (sale) with a $279.90 crossed-out reference as of October 12, 2026. An eBay open-box listing showed $172.10 item price with an auto-applied coupon estimating $129.08 before tax. At the $249.90 price, a BLUETTI Elite 30 V2 at $279.99 direct offers 288Wh, 600W, LiFePO4 and active manufacturer support. The Jackery Explorer 300 is $259 sale / $289 list with a 2-year plus 1-year extended warranty. The EcoFlow RIVER 3 Plus is $299 with 600W and a specified sub-10ms UPS transfer.

Sources

Manufacturer:

Independent reviews:

Owner reports:

Parts and stores:

Buying guides for this category

Related products