Costco Wholesale has for its
Members:
Ecoflow Delta Pro Ultra Whole-Home Power Solution for
$6999.99.
Shipping is free.
Thanks to community member
caldog101 for sharing this deal.
Includes:
- EcoFlow DELTA Pro Ultra Inverter
- 2x EcoFlow DELTA Pro Ultra Battery
- EcoFlow DELTA Pro Ultra Trolley
Features:
- Scalable 12kWh solution provides up to a week of essential power supply
- Exceptional 7200W output powers most household appliances at 120V or 240V
- Super-fast charge up to 8800W by combining solar and AC
- Online UPS ensures 0-ms transfer time, offering constant protection for sensitive devices
- Long-lasting 10-year LFP battery for reliable performance
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Top Comments
This one qualifies for a 30% tax credit and will last 10 years
310 Comments
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https://youtu.be/XHZWGLzT7gg?si=
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This one qualifies for a 30% tax credit and will last 10 years
https://www.bobvila.com/articles/...ator-cost/
The good news is you're both correct that 9v batteries use 6 cells of another battery. It's a mini battery pack. All of the batteries being talked about on this thread are battery packs of many small individual batteries put together.
The idea is to draw from this battery during peak hours as set by your utility, then charge this during non-peak hours. Your actual rates matter less than the divergence between on-peak and off-peak. We don't have time-of-use rates in Washington State, but looking atSoCal Edison for an example [sce.com], it looks like the on-peak / super-off-peak rate split is 27 cents / kWh.
If we're paying $8k for the unit + panel, plus 10% sales tax and minus 30% for the tax credit, a fair estimate of our cost is $6400 (this is before any utility incentives that might be available).
If we assume that you use the full 12 kWh capacity of the battery during the on-peak hour, the rate arbitrage that this battery lets us do nets us 12 kWh * $0.27/kWh = $3.24/day of savings.
At $3.24/day of savings, how many days would it take to pay back our $6400 investment?
$6400 / $3.24 = 1975 days = a bit under 5 and a half years.
Let's change the question - how big of an on-peak / off-peak rate split do you need to recoup your $6400 investment?
To save $6400 over 10 years, we'd need to save $6400 / 3650 days = about $1.75/day. To save $1.75 across 12 kWh, we'd need an on-peak / off-peak split of a bit under $0.15/kWh.
There are other factors worth exploring if the decision is an borderline for you - stuff like the installation costs, time value of money, personal benefits of power backup, energy losses for charging and discharging, the potential for your rates to change, possible utility incentives to further decrease the up-front cost, battery degradation, solar... the list goes on. Still, if my utility had time-of-use rates like SoCal Edison or PG&E, I'd pull the trigger on this without much hesitation.
Since it's rather long, now we begin to question our confidence in the assumptions - will the unit still retain 100% day zero capacity over nearly 2000 charge/discharge cycles? What's the likelihood of any other component malfunctioning?
If the PBP were say, 6 months to a year, confidence would be higher that it won't break in the time that it takes to pay for itself.
You're basically correct as I pointed out. The typical home uses about 30kwh a day on average. But that's just an average - even though on the whole I am personally very close to that 30kwh average, that's heavily weighted to the weekends (laundry/baking) or the summer (AC). So it's safe to assume that if the power's out you're going to suspend baking/laundry and probably not be using whole home AC. Now that everything is LED, that cuts back the lighting duty by quite a bit (probably 90%), leaving stuff like refrigerators, freezers, charging devices, lighting, maybe a well pump. Still though, 12kwh isn't going to last long - maybe 2-3 days if you baby it?
The larger point is that systems like these aren't really a substitute for a generator, at least in terms of capacity or outage duration. The only instance I can see a battery unit like this being feasible is if you are prone to multiple relatively short outages. That way you could leave this plugged in, then when the power goes out, switch over to it. You could install an auto transfer switch to make it more seamless, but that's going to cost a lot of money. I wouldn't even consider units like these portable enough to use while camping (e.g. cpap or similar).
You all still wanna make jokes about FPL not giving away "free" thermostats? Sounds like those free thermostats cost you 40 cents per kwh lol.
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But here's a comparator: LG 16kWh battery for $6750
https://ressupply.com/batteries-a...hv-battery
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