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frontpageSkillful_Pickle | Staff posted Sep 08, 2025 05:53 PM
frontpageSkillful_Pickle | Staff posted Sep 08, 2025 05:53 PM

2-Pack ECO-WORTHY 14kWh 51.2V 280AH LiFePO4 Battery Backup + Busbar

+ Free Shipping

$3,850

$4,200

8% off
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eco-worthy-us via eBay has 2-Pack ECO-WORTHY 14kWh 51.2V 280AH LiFePO4 Solar Battery Backup w/ 200A BMS + Busbar (Version2) on sale for $4199.99 - $350 with coupon code FRESHPICKS at checkout = $3849.99. Shipping is free.

Note: Also includes bonus 400A Busbar with 6×M8 Studs.

Thanks to staff member Skillful_Pickle for sharing this deal.

About this Item:
  • Battery Capacity: 280Ah each
  • Battery Power: 14336Wh each
  • Rated Voltage: 51.2V
  • Voltage Range: 40~58.4V
  • Maximum Charge/ Discharge Current: 200A
  • Charge Temperature Range: 0-55℃
  • Discharge Temperature Range:﹣20-55℃
  • Maximum Charge Voltage: 58.4V
  • Screw size: M8
  • Battery Size: 20.5x9.9x29.3in
  • Battery Weight: 297.6lb/135kg each
  • Max. parallel units: 15
  • Connectors: RS232 / CAN / RS485
  • Manufacturer Page for more details.

Editor's Notes

Written by qwikwit | Staff

Original Post

Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
eco-worthy-us via eBay has 2-Pack ECO-WORTHY 14kWh 51.2V 280AH LiFePO4 Solar Battery Backup w/ 200A BMS + Busbar (Version2) on sale for $4199.99 - $350 with coupon code FRESHPICKS at checkout = $3849.99. Shipping is free.

Note: Also includes bonus 400A Busbar with 6×M8 Studs.

Thanks to staff member Skillful_Pickle for sharing this deal.

About this Item:
  • Battery Capacity: 280Ah each
  • Battery Power: 14336Wh each
  • Rated Voltage: 51.2V
  • Voltage Range: 40~58.4V
  • Maximum Charge/ Discharge Current: 200A
  • Charge Temperature Range: 0-55℃
  • Discharge Temperature Range:﹣20-55℃
  • Maximum Charge Voltage: 58.4V
  • Screw size: M8
  • Battery Size: 20.5x9.9x29.3in
  • Battery Weight: 297.6lb/135kg each
  • Max. parallel units: 15
  • Connectors: RS232 / CAN / RS485
  • Manufacturer Page for more details.

Editor's Notes

Written by qwikwit | Staff

Original Post

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Top Comments

vnangia
538 Posts
302 Reputation
A lot of it depends on what exactly your electrical set up is. Hard to tell you without that—if you have a critical loads panel (probably not) then it's relatively easy. If not, then one option could look like this:

Install a whole home transfer switch or a generator interlock.
Plug in the battery/inverter (this plus a large inverter, or the Delta Pro or similar) into the generator/backup input port.
Install a special breaker to charge the battery/inverter that you will turn off when on battery power.
Manually switch to the generator during outages and switch back when grid power is back. Turn on the battery charging breaker when power is back.


I use this $150 transfer switch [vevor.com] to bypass the inverter and feed the panel directly from the grid when I need to do inverter/battery maintenance, for example, and it's ... fine, does the job, no issue. 4/0-4/0-4/0-2/0 SER wiring cost me about $8/foot, and I bought 10ft. The battery breaker, even like a 50amp ($20?), plus associated socket ($35 for a wall-mount socket) and AWG6 wiring, maybe $2/foot and assume maybe 25 ft?

The battery and inverter is where it'll get spendy. But this would almost certainly meet code as long as the individual components are UL listed and you're absolutely sure to turn off the battery charging breaker before switching to the battery feed.

71 Comments

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Sep 08, 2025 10:01 PM
851 Posts
Joined May 2012
luddite_cyborgSep 08, 2025 10:01 PM
851 Posts
I read through the instruction manual looking to see proper way these should be connected in parallel but didn't find anything, anybody got a link to procedure? I imagine these are going to stand side by side for that, so I'm confused why they put the screen on the side too, how are you supposed to see the thing when there's a bunch of these tied together?
1
Sep 09, 2025 12:35 AM
2,886 Posts
Joined Jan 2006
CompassionateVegSep 09, 2025 12:35 AM
2,886 Posts
I made a mistake. for some reason I was thinking that the amp hour configuration was directly relating to the watt hour. I was wrong. 280 amp hours does not quite to a kilowatt hour conversion.
1
Sep 09, 2025 12:38 AM
5,683 Posts
Joined May 2004
PRINTABLECOUPONSep 09, 2025 12:38 AM
5,683 Posts
Quote from CompassionateVeg :
I'm trying to understand what is the major difference between this huge system and the batteries themselves. The battery seem to be about $300 and so what is going on with this big containment unit which quadruples the price? wouldn't you just need a controller to deal with the solar in and out?
Where are you finding batteries that cheap no way you can get 14kwh for 300
Sep 09, 2025 12:41 AM
2,886 Posts
Joined Jan 2006
CompassionateVegSep 09, 2025 12:41 AM
2,886 Posts
Quote from PRINTABLECOUPON :
Where are you finding batteries that cheap no way you can get 14kwh for 300
I made a mistake. for some reason I was thinking that the amp hour configuration was directly relating to the watt hour. I was wrong. 280 amp hours does not quite to a kilowatt hour conversion.thank you for the correction.
1
Sep 09, 2025 12:43 AM
1,903 Posts
Joined Apr 2007
topchoSep 09, 2025 12:43 AM
1,903 Posts
Quote from Fraktal.Mats :
New to solar and still learning - could these be charged with line power?
These and similar batteries work at 50V DC. It's up to the inverter to choose the source to charge them. Most, if not all, can charge from both the grid and solar power. It's really an inverter thing, not the battery.
Sep 09, 2025 01:59 AM
482 Posts
Joined Oct 2008
pmasonSep 09, 2025 01:59 AM
482 Posts
Picked up a pair. Good to see they added the bus bar. Kinda surprised I'm not seeing more teardowns/reviews. If I open mine up I will try to post somewhere what I find.
Sep 09, 2025 03:34 AM
140 Posts
Joined Nov 2022
JollySpaniel3428Sep 09, 2025 03:34 AM
140 Posts
Quote from woebags :
Simple answer is no. The Tesla PW3 has an integrated inverter which it is not possible to add additional batteries to. AFAIK
Why not add this upstream of the powerwall (this charges powerwall)

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Sep 09, 2025 09:37 AM
101 Posts
Joined Mar 2007
icerSep 09, 2025 09:37 AM
101 Posts
What would have to happen to get these to keep a grid tied system active during a power outage? We're in contract for a 13kw system but the power wall was a 16k add on, which just doesn't make sense. I keep seeing these deals (and delta pro) for around $4k for similar size battery.
1
1
Sep 09, 2025 11:32 AM
111 Posts
Joined Oct 2009
antidelldudeSep 09, 2025 11:32 AM
111 Posts
Quote from icer :
What would have to happen to get these to keep a grid tied system active during a power outage? We're in contract for a 13kw system but the power wall was a 16k add on, which just doesn't make sense. I keep seeing these deals (and delta pro) for around $4k for similar size battery.
Depends. Do you want to be able to flip a switch and have it take over? Do you want it to take over automatically? Or do you want it to be completely uninterruptible?
The answer increases in complexity the more seamless you want it. Totally doable, but also know that if you do a grid tied inverter with it that it will never meet code.
Sep 09, 2025 12:16 PM
101 Posts
Joined Mar 2007
icerSep 09, 2025 12:16 PM
101 Posts
Quote from antidelldude :
Quote from icer :
What would have to happen to get these to keep a grid tied system active during a power outage? We're in contract for a 13kw system but the power wall was a 16k add on, which just doesn't make sense. I keep seeing these deals (and delta pro) for around $4k for similar size battery.
Depends. Do you want to be able to flip a switch and have it take over? Do you want it to take over automatically? Or do you want it to be completely uninterruptible?
The answer increases in complexity the more seamless you want it. Totally doable, but also know that if you do a grid tied inverter with it that it will never meet code.
I don't mind manual intervention, but the solar guy I talked to said it would take 10k of wiring to make it come to code. That said, he's the guy that wants to sell the 16k system.
I was trying to figure out if there was a way to use an approx $4k battery and, even if I have to throw a switch, have solar keep working (in a code - compliant manner) during a power outage.
1
Sep 09, 2025 01:25 PM
14 Posts
Joined May 2016
HoodamSep 09, 2025 01:25 PM
14 Posts
FYI, these batteries have proprietary connectors that cannot be purchased and neither can replacement cables.
1
Sep 09, 2025 04:13 PM
765 Posts
Joined Jul 2014
Khall187Sep 09, 2025 04:13 PM
765 Posts
Close but still $3500 more than my deal alert
1
Sep 09, 2025 04:48 PM
11 Posts
Joined Oct 2017
kitkatcaSep 09, 2025 04:48 PM
11 Posts
Such a deal. In for 10 before the lock.
1
Sep 09, 2025 05:01 PM
538 Posts
Joined Feb 2010
vnangiaSep 09, 2025 05:01 PM
538 Posts

Our community has rated this post as helpful. If you agree, why not thank vnangia

Quote from icer :
I don't mind manual intervention, but the solar guy I talked to said it would take 10k of wiring to make it come to code. That said, he's the guy that wants to sell the 16k system.
I was trying to figure out if there was a way to use an approx $4k battery and, even if I have to throw a switch, have solar keep working (in a code - compliant manner) during a power outage.
A lot of it depends on what exactly your electrical set up is. Hard to tell you without that—if you have a critical loads panel (probably not) then it's relatively easy. If not, then one option could look like this:
  1. Install a whole home transfer switch or a generator interlock.
  2. Plug in the battery/inverter (this plus a large inverter, or the Delta Pro or similar) into the generator/backup input port.
  3. Install a special breaker to charge the battery/inverter that you will turn off when on battery power.
  4. Manually switch to the generator during outages and switch back when grid power is back. Turn on the battery charging breaker when power is back.

I use this $150 transfer switch [vevor.com] to bypass the inverter and feed the panel directly from the grid when I need to do inverter/battery maintenance, for example, and it's ... fine, does the job, no issue. 4/0-4/0-4/0-2/0 SER wiring cost me about $8/foot, and I bought 10ft. The battery breaker, even like a 50amp ($20?), plus associated socket ($35 for a wall-mount socket) and AWG6 wiring, maybe $2/foot and assume maybe 25 ft?

The battery and inverter is where it'll get spendy. But this would almost certainly meet code as long as the individual components are UL listed and you're absolutely sure to turn off the battery charging breaker before switching to the battery feed.
2

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Sep 09, 2025 06:35 PM
2 Posts
Joined Nov 2014
tudoSep 09, 2025 06:35 PM
2 Posts
Are these things UL listed? I'm guessing not since they don't mention certification anywhere.

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