I love this product. I have a unique use for it in a server computer environment. I wanted to use it as backup power for 4 home-built server machines. The Yeti 1250 has a pure sine wave invertor which is 'better' than the modified sine wave used in UPSs for sensitive electronics. Those little consumer grade Uninterrupted Power Supplies (UPS) only give you a couple minutes of power. But with the Yeti Goal Zero 1250, I can have all 4 machines running for an additional 1 hour. I average around 960 watt draw between the 4 servers, along with some more draw from a switch, modem and router -- and tested it letting it run down... it was 61 minutes before it powered off. Because the power supply in the Yeti is only like 77 watts, you can't plug directly into the Yeti and expect it to operate as a UPS directly. If I'm drawing 1000 watts, yes the Yeti is capable of handling that, but can only draw 77 watts from your house AC, the rest is coming from the battery. Thus, it wouldn't be infinite power. To resolve this issue, I bought a Tripp Lite Switched PDU. This is a little power strip looking device that has 2 incoming AC plugs on the back. The primary goes into your house AC, and the secondary plugs into the Yeti. The Yeti of course plugs into your house AC to keep the battery topped off, or to solar panels or even wind generators. The Tripp Lite will instantly trip over to the secondary power (Yeti 1250) if there is a blackout. The Yeti instantly kicks in. As an added level of security, I have 3 CyberPower UPSs in between the Tripp Lite Switched PDU and the server computers. These help to guard against power fluctuations during the nearly instant transfer from AC to Yeti power. Also, once the Yeti completely does run out of power (after 61 minutes), then these little CyberPower UPSs can give you another 3-5 minutes but more importantly, shut down the computers and send out email notifications/text notifications just prior to shutting down the computers [safely]. Where I live, a typical power outage is a blown transformer, and they can usually get the power back up in just under 1 hour. So this setup, thanks to the Yeti 1250, should in theory keep me going 24/7 through most blackouts. Once the power is restored, the Tripp Lite Switched PDU automatically detects AC Grid power, and goes back to primary power, and the Yeti no longer is being used and instantly begins to recharge itself. The Yeti is extremely well made, and although people complain about the cost and ability to build your own similar generator for cheaper, I'm of the train of thought that you get what you pay for, and I like the idea and convenience of just paying for quality -- and I think that's what I've got with the Goal Zero Yeti 1250.
The Yeti 1250 is a nicely integrated unit. With a 100 Ah battery, it provided enough power to run our large refrigerator 12h, our freezer 12h, and other items computer, TV, etc. for a significant time. The 2-60W solar panels included are great for topping off the charge on a daily basis. If running a refrigerator or freezer, I suggest adding a solar panel in the 200W range to help keep up with the drain if you need to run it more than a few hours. It would be nice if the input sockets did not use diodes internally, and if all of the connectors were Anderson Power Pole type instead of just the two on the system. Overall, a well-designed, great item for power outage situations, and for running other equipment, e.g., ham radio gear, TV, computers, etc., regularly.
I've been using the Yeti 1250 for about two months at an off-grid cabin in the mountains to run lighting, charge electronics, and use powertools. I charge it using the panels and every once in a while run the generator to top it off as well. The Yeti is powerful enough to run a jigsaw, power drill, and charge my power tools batteries while doing construction and it's great to be able to work without the noise of a generator... Highly recommend it!!
Moved to the Adirondack Mountains and lived off the grid for 2.5 years in the old place while building the passive solar home with a house-sized array and battery bank. We kept two of these chained in the attic, connected to two 100W panels, and they powered our laptops, washing machine, vacuum cleaner, headlamps, "Lighthouse" lamps rechargeable batteries, cell phones, etc. Around winter solstice we sometimes had to top off the power with a generator, but overall these did the trick beautifully. We're keeping them connected to the new home as a backup power source, just in case. I just recommended one of these to a friend whose sister lives in Puerto Rico and has been without power since Irma washed through.
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