![]() What I’m seeing on their site at the moment Based on my now 5-year dated OEM production knowledge that should put their price point to profit at about … $40-50 under where the price is on the flash sale. You have a manufacturing cost for the assembly, container, inverter, shipping, packaging, promotion, free units for reviewers, etc. The batteries contained within for 0.28kWh cost between $40 and $80 if I’m reading correctly. ![]() Neither of these things changes brand to brand other than how big the tank is and how fast the car goes. Think of watt hours as gasoline and watts as speed. Less wattage means longer life, more means shorter. If you’re pulling 100 watts an hour, you’re going to run a little over two and a half hours before the unit is drained. 280 Watt Hours is what’s capable of being contained in the unit. It will also not last forever on a single charge. You want to power those things, you’ll need to add a comma to your budget, 40 pounds to the unit, and probably drop the word “portable.” Your refrigerator? Not unless it’s a camping or RV fridge. This is ok, that’s not what this is designed for. You probably will not power a coffee pot. That is 300 with this unit (peaks at 500, but we’ll say 300 as that’s what it’s rated.) You will not power a toaster. You have a set maximum wattage – that is how much juice you can pull at one time. ![]() These are just some notes if you’re just getting into power stations. This is the case with any portable power station, so don’t think I’m picking on ROCKPALS here. ![]() What the ROCKPALS Rockpower won’t do (understand your power) You want to fast charge a bunch of devices at an outdoor event. You just want to be ready when the power eventually goes out. I mean, it’s overkill, but it prevents me from having to run 300 feet of extension cords to power a projector. My personal favorite use case scenario with it has been outdoor movie night with my XGIMI Elfin projector. You’re running a school event and need to power a speaker / DJ station for a bit. You just want to power your phone for a very long time. Your power’s out in a storm and you want to power your phone and a heating blanket. This’ll do it (although turn off the humidity and hose heat portion as that is a major power drain.) You’re in the woods and don’t want to scare the bears with your snoring and would not like to be killed by your camping buddies and need to power a CPAP. Why would you want a ROCKPALS 300W Portable Power Station? So, decent unit, might have notes on solar charging later but two weeks of rain sort of have put a damper on that part of the review. That literally is the only thing I could nitpick on the Rockpower 300. I tested the charger they included on another and yeah, other power stations charge faster even on their charger. Maybe it charges a little slower than other portable power stations than I’ve worked with but that’s generally not a use case I’m really worried about. This was a hard review to do because there’s nothing really wrong with the unit that I could nitpick at. It delivers the power, it appears to function as anticipated and advertised, and it’s currently $100 off on the Rockpals site (as of ). I’ve been working with this for about two weeks at this point along with a solar panel that we’re going to do a separate review of. The ROCKPALS 300W Portable Power Station brings 280 watt hours of power wherever you need it in an under eight pound package.
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