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MinhTrinh 10.9K Views
Sep 8, 2026 11:37 PM

Costco Members: Bluetti AC500 5000W Power Station w/ B300K Battery Expansion

$1,200

$1,500

20% off
+ Free S&Hat Costco Wholesale
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Deal Details
Costco Wholesale has Bluetti AC500 5000W Portable Power Station w/ B300K 2764.8Wh Battery Expansion (C-AC500-3-65) on sale for $1199.99 valid for Costco Members only. Shipping is free.

Thanks to community member MinhTrinh for finding this deal

Note, must login to your Costco account w/ an active membership to purchase (5% for Non-Member Service/Surcharge Fee)

Includes
  • Bluetti AC500 5000W Portable Power Station
  • Bluetti B300K 2764.8Wh Battery Expansion
  • Bluetti AC500 Solar Charging Cable (MC4 to Aviation Cable)
  • Car Charging Cable (Cigarette Lighter-M to MC4)
  • Battery Expansion Cable (CA090)
  • 15A AC Charging Cable
  • P090D-P150D Cable

Editor's Notes

Written by Discombobulated | Staff
  • Price Research
    • At the time of research, this product is $300 lower (20% savings); normally listed/priced for $1499.99, this combines both the power station an expansion battery unit
  • About the Deal
    • Effortlessly handle the demanding startup requirements of appliances like air conditioners, power tools, and large refrigerators; unit features 5000W rated power w/ 10,000W surge, 2764.8Wh capacity w/ 16 versatile outlets
    • Limit 2 per member
    • Offer valid through September 13, 2026 or while promotional price/supplies last
  • Additional Details
    • Costco products can be retuned to any of the more than 800+ Costco warehouses worldwide

Original Post

Written by MinhTrinh
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Costco Wholesale has Bluetti AC500 5000W Portable Power Station w/ B300K 2764.8Wh Battery Expansion (C-AC500-3-65) on sale for $1199.99 valid for Costco Members only. Shipping is free.

Thanks to community member MinhTrinh for finding this deal

Note, must login to your Costco account w/ an active membership to purchase (5% for Non-Member Service/Surcharge Fee)

Includes
  • Bluetti AC500 5000W Portable Power Station
  • Bluetti B300K 2764.8Wh Battery Expansion
  • Bluetti AC500 Solar Charging Cable (MC4 to Aviation Cable)
  • Car Charging Cable (Cigarette Lighter-M to MC4)
  • Battery Expansion Cable (CA090)
  • 15A AC Charging Cable
  • P090D-P150D Cable

Editor's Notes

Written by Discombobulated | Staff
  • Price Research
    • At the time of research, this product is $300 lower (20% savings); normally listed/priced for $1499.99, this combines both the power station an expansion battery unit
  • About the Deal
    • Effortlessly handle the demanding startup requirements of appliances like air conditioners, power tools, and large refrigerators; unit features 5000W rated power w/ 10,000W surge, 2764.8Wh capacity w/ 16 versatile outlets
    • Limit 2 per member
    • Offer valid through September 13, 2026 or while promotional price/supplies last
  • Additional Details
    • Costco products can be retuned to any of the more than 800+ Costco warehouses worldwide

Original Post

Written by MinhTrinh

Community Voting

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+40
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30 Comments

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Sep 9, 2026 1:39 AM
419 Comments
Joined Feb 2010
eric102Sep 9, 2026 1:39 AM
419 Comments

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

I have one of these and four batteries in use 24/7 for 4 plus years. No issues and still occasionally getting software updates. Works great as a whole house UPS grid backup and solar generator. My hodgepodge collection of solar panels brings in 2,600 watts. Great deal, I think I paid over 2k back then just for the AC500, no battery included.
Last edited by eric102 September 8, 2026 at 06:43 PM.
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Original Poster
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Sep 9, 2026 2:27 AM
6.8K Comments
Joined Nov 2006
MinhTrinhSep 9, 2026 2:27 AM
Original Poster
Pro
6.8K Comments
Quote from eric102 View quoted comment :
I have one of these and four batteries in use 24/7 for 4 plus years. No issues and still occasionally getting software updates. Works great as a whole house UPS grid backup and solar generator. My hodgepodge collection of solar panels brings in 2,600 watts. Great deal, I think I paid over 2k back then just for the AC500, no battery included.
I know right. The battery by itself is $900 (refurbished) to $1100 (new on sale). I just dont need another AC500 inverter. Otherwise, i would jump on this set up.
Sep 9, 2026 2:42 AM
2.8K Comments
Joined Jul 2013
BeepBopBeepSep 9, 2026 2:42 AM
2.8K Comments
How do I determine what size battery I would need? Is there a calculator? My average monthly consumption is 2000KWh
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Sep 9, 2026 3:42 AM
6.7K Comments
Joined Dec 2004
CaleoSep 9, 2026 3:42 AM
6.7K Comments

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

Quote from BeepBopBeep View quoted comment :
How do I determine what size battery I would need? Is there a calculator? My average monthly consumption is 2000KWh
Depends what you want to power, and for how long. 2000kWh/mo is pretty heavy consumption. That's about 66kWh/day, or a continuous average of almost 3kW.. it's not really realistic to expect any portable battery backup solution to handle that kind of power for more than a couple hours, period. You'd have to spend a fortune buying proprietary batteries for units like this or Ecoflow's just to last 8+ hours (like 30kWh worth) as if nothing happened.

You're probably running central AC a lot, and one of these as a 'whole home backup' would likely be at or near overload with just that alone, nevermind everything else you might have running simultaneously.

If you can dial it back to just your fridge, chest freezer, and maybe a few other essential circuits during an outage, you could have a fridge/freezer & some lights and other moderate loads (~600-800W total average) last 12hrs+ with 10kWh worth of batteries.
Last edited by Caleo September 8, 2026 at 08:48 PM.
4
Sep 9, 2026 10:21 AM
1.4K Comments
Joined Jun 2006
SlickBison55Sep 9, 2026 10:21 AM
1.4K Comments
dang those are big heavy boys
Sep 9, 2026 11:34 AM
67 Comments
Joined May 2019
shopfordaysSep 9, 2026 11:34 AM
67 Comments
Fantastic deal so bought one. One of my two AC300s are having an issue out of warranty so this will be a nice replacement.
Sep 9, 2026 12:13 PM
12 Comments
Joined Jan 2024
seti0070Sep 9, 2026 12:13 PM
12 Comments
Im not in a hurry to purchase so can wait. Does anyone think it'll be chaeaper on Black Friday? Does Costco price macch their own prices?

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Sep 9, 2026 12:42 PM
12 Comments
Joined Jan 2024
seti0070Sep 9, 2026 12:42 PM
12 Comments
Quote from eric102 View quoted comment :
I have one of these and four batteries in use 24/7 for 4 plus years. No issues and still occasionally getting software updates. Works great as a whole house UPS grid backup and solar generator. My hodgepodge collection of solar panels brings in 2,600 watts. Great deal, I think I paid over 2k back then just for the AC500, no battery included.
I ahve a few questions for you. I heard that if the batteries die, the unit doesnt turn back on? Also, how many solar inputs does it have? I have 4x405W panels and in series, they are at around 160Volts PV. This unit has a max input pv of 150V i think. WIll it still work or would i need to split it in two segmetns? My plan is to run my reef aquarium entirely off this plus solar and grid as a backup. If its conencted to hte grid, does the software allow for PV priority? Originally I was thining about a 48V server rack battery plus a hybrid inverter setup but this is a cleaner all in one package. Thanks
Sep 9, 2026 12:59 PM
213 Comments
Joined Sep 2018
SeriousDirt9747Sep 9, 2026 12:59 PM
213 Comments
What's the actual capacity of the base unit? The bluetti website seems bizarrely evasive on that, providing only context with batteries attached. It does have innate capacity, right? I assume it's also ~2700wh like the battery?

Anyone know the passive inverter draw, roughly? I wouldn't mind setting this to charge at low rate times and discharging during high for fridges and the like... but that's already jousting with false economy to begin with and really pushes it if passive draw is substantial.
Last edited by SeriousDirt9747 September 9, 2026 at 06:02 AM.
Sep 9, 2026 1:02 PM
90 Comments
Joined Jan 2022
SociableSeed594Sep 9, 2026 1:02 PM
90 Comments
I'm confused, does the AC500 not have a battery in it ?
Sep 9, 2026 1:10 PM
1.4K Comments
Joined Sep 2005
superbaldeSep 9, 2026 1:10 PM
1.4K Comments
OK really general question. Can I use this for "plug-in solar?" Like I'd like to set this up for use during the day and then maybe the battery during the night? Thanks in advance!
Sep 9, 2026 1:19 PM
35 Comments
Joined Sep 2024
StrongLake4786Sep 9, 2026 1:19 PM
35 Comments
Quote from SeriousDirt9747 View quoted comment :
What's the actual capacity of the base unit? The bluetti website seems bizarrely evasive on that, providing only context with batteries attached. It does have innate capacity, right? I assume it's also ~2700wh like the battery?

Anyone know the passive inverter draw, roughly? I wouldn't mind setting this to charge at low rate times and discharging during high for fridges and the like... but that's already jousting with false economy to begin with and really pushes it if passive draw is substantial.
The AC500 has no internal battery. All storage comes from add-on batteries
Sep 9, 2026 1:19 PM
35 Comments
Joined Sep 2024
StrongLake4786Sep 9, 2026 1:19 PM
35 Comments
Quote from SociableSeed594 View quoted comment :
I'm confused, does the AC500 not have a battery in it ?
Correct. The AC500 itself does not contain batteries.
Sep 9, 2026 1:22 PM
1.2K Comments
Joined Dec 2013
G3HSep 9, 2026 1:22 PM
1.2K Comments
Where do you get additional B300K Expansions? Do they have the same "good deal"?

Edit: a quick search finds it is as expensive as the entire Costco package. May as well go for two. Makes no sense unless
Last edited by G3H September 9, 2026 at 06:31 AM.

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Sep 9, 2026 1:27 PM
213 Comments
Joined Sep 2018
SeriousDirt9747Sep 9, 2026 1:27 PM
213 Comments
Quote from StrongLake4786 View quoted comment :
The AC500 has no internal battery. All storage comes from add-on batteries
Wow. That... makes this a lot less interesting, then. Unless you absolutely need the surge rating, the 3840 wh bluetti has been on sale on aliex for about $800 several times recently.

Or unless you REALLY needed 5k capacity on one unit... two anker s2000s would have more battery capacity, and if you could split the load, only slightly less draw and lower price.
Last edited by SeriousDirt9747 September 9, 2026 at 06:44 AM.
1

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