EF ECOFLOW Extra Battery for Delta Pro Ultra X, Expandable to 180kWh, Lifepo4 Battery for Home Backupm & Emergency
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Availability:
Only 10 left in stock, order soon!
Arrives
Saturday, Jan 17
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Style: DELTA Pro Ultra X Extra Battery
Features
- Expandable capacity - Increase the capacity of DELTA Pro Ultra X with an extra 6144Wh.
- Plug-and-play without setup. And use the EcoFlow app to monitor and control.
- The Highest Safety Standards: EV-grade LFP cells, dual BMS, and 3-level safety architecture.
Brand: EF ECOFLOW
Power Source: Solar Powered
Model Name: DELTA Pro Ultra X Extra Battery
Included Components: EcoFlow Smart Extra Battery (DELTA Pro Ultra X) (x1), EcoFlow Battery Connection Cable (0.65ft) (x1)
Product Dimensions: 26"L x 18"W x 8"H
Product Dimensions: 26 x 18 x 8 inches
Item Weight: 111.3 pounds
Manufacturer: ECOFLOW
Item model number: EFYJ751-BP
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Jan 17
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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Top Amazon Reviews
Style: DELTA Pro Ultra
This thing goes WAY beyond expectation! It automatically balances solar inputs and circuit outputs, charging the battery to peak and then shutting off the solar if you aren’t loading it with household circuits. If battery charge drops below your pre-set emergency battery storage level, it pulls electricity from the grid to fill in the gaps. You’re covered 24/7, one way or another. I’ve been eyeballing it and testing things and on a sunny summer day, overnight draws are replaced and the batteries topped off by noonish. Right now, my whole house is running through it with the exception of the A/C and the circuit that the unit is plugged into in order to draw grid power. I have more solar cells coming and a second battery, at which point I expect the electric company to start wondering why I’m selling them electricity but not buying any.
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Reviewed in the United States on August 23, 2025 by Stephen Cohrs
Style: DELTA Pro Ultra
Everything arrived in less than 2 weeks without any problems. Connected this system to an existing 10 circuit transfer switch. Added an extra battery (now have 2), added 8 x 195-watt solar panels. Batteries came with a 30% change. Used solar and gas generator to charge to 100%. Then ran my 10 circuits (everything we must have) for over a day with solar disconnected. With solar connected (and some sunny days) we could run for a few days easy. Overall, very happy with the system. Had a chance to use their support and warranty recently. My 14-yr old gas generator died. So, I tried charging by plugging into a 110V outlet which didn't work, no error or indication why. Contacted support via email (emails are answered overnight) and got a canned response the next day that had me try the normal basic stuff. I answered back that none of that resolved the problem. They then wanted a detailed description of the problem and to upload a video of the failing phenomenon and also to try different outlets, which I did. After a couple of days, they determined (educated guess) the problem was the AC power cord and were sending me a new one. That took over a week and did noy fix the problem. I then asked them to replace the controller / inverted. The next day they informed they would send me a NEW unit as soon as they received my unit. They provided a FedEx shipping label. Sent my unit back and received the new replacement in just over a week. So why 5 stars? They replaced my unit with a NEW unit. I also found out that all the outlets I tried were unused and on a GFI circuit which popped as soon as the AC cord was plugged in, probably a grounding issue. AC charging worked fine on a non GFI outlet. Their products are great, and they honored their warranty. Uploading a video was a little strange!
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Reviewed in the United States on December 29, 2024 by TI99
Style: DELTA Pro Ultra Battery
Our son is a huge ecoflow fan so he recommended for us to get the ecoflow delta pro ultra! He has an extra inverter so it turns out that all we needed to buy was the battery itself! It’s great since we got to save money instead of buying the whole system! The battery is very heavy but at 110lb or so we aren’t too old to move it quite yet! (In our 70s). Our son recommended us to use it to backup our refrigerator since we don’t yet have the smart panel installed so we can’t quite tie it into our home, and our HOA don’t allow for solar panels, but my son and I ran a test and this thing is running our refrigerator as we speak and it’s been two and half days! Still got around 7% left! It’s a game changer for retiree like myself because I travel a lot with my wife and often gone for weeks, so being able to back up my fridge for so long really gave me the peace of mind. I also own some rental property and to be able to power up a tenant’s home during an outage is also quite useful! Nothing make happier tenants than light and warmth. Lastly, my beautiful grandkids love to play with this big instrument. My naughty son even shove his sister away just so he can play with it. She keep saying “sheer!” I think she wants to play too.
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Reviewed in the United States on September 21, 2025 by Amazon Customer Amazon Customer
Style: DELTA Pro Ultra+Extra Battery
Bought this with 2 batteries for vanlife. Got it on sale and used prime card for more savings. Works as expected, runs my window AC, air fryer and everything else fine. The only issue is that charging from an EV charger never reaches 7200w. It only goes up to 6100w. An extra 1200w would be nice, thats 10% of extra charge (since i have 2 batteries) per hour. Update: Been a few months now so... 1. The charge controller makes a clicking sound when it detects power from solar panels, not loud or obnoxious but something to consider i guess? It clicks on/off in the mornings and evenings due to low solar irradiation. 2. The battery level indicator is only accurate for a few days. I think the batteries have to be charged to 100% once in a while to keep it accurate. I currently have it set to max discharge 5% and max charge 95%. The amount of power I use from an EV charger and the percent on the display is off significantly, so when I notice that, i just charge it to full. 3. The LCD display is constantly turning off/on when power is being drawn or stops being drawn. I wish there was a way to permanently turn it off since I live in a van (soon a truck camper 😬) and the bright as light is annoying af. 4. The standby power consumption is consistent with some youtubers measurements. I'm estimating it to be 5-10% per day. That is a big deal for vanlife but the 2 mppts, AC and EV charging makes up for it. My next camper will probably have 1600-2000w worth of panels. I currently have 1040w which would be fine if I didnt run AC or electric heat but I spoil myself. 5. While driving, if your panels become shaded temporarily, the input will go to 0w before going back to normal. If you're in shade too long, say under a lengthy tunnel or bridge or a row of trees, the charge controller won't start charging immediately after you're back in the sun. It takes several minutes, I haven't timed it. This sucks. That's all I can think of for now, hope it helps. Update 2: I just realized the inverter spits out a ton of heat while charging. In my truck camper now and I find that it heats up the entire space really quickly. This might not be the best product for van/camper/rv living since the AC has to fight all the heat this thing produces. May be in the winter I'll have a different opinion...? Update 3: I noticed when charging, the battery % jumps from the mid 50% up to 70% or so. Kinda weird how it can be so innaccurate, even after the update that supposedly fixed the problem of it not displaying the correct battery level. Sometimes I feel like the battery % that's displayed is totally off...seems like a serious flaw when trying to run this on a small solar setup. When the battery level that's displayed is too low and it hits your max discharge level, you won't be able to use it even if you suspect the system is wrong. I'm thinking about selling this thing and going back to building my own system. 🤷 Update 4: Let the system drain to about 4% then charged it fully. It only charged ~8 KWh to get to 100%. Which means about 3500-4000Wh was left, likely in the second battery. The voltage reading must be off so that's probably why it thinks there's only 4% left. Such a disappointment.
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Reviewed in the United States on August 4, 2024 by Larry L.