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    Discouraging results on Bluetti EB240

    Any updates on this, re: return policy for the DOA, and performance of the good EB240? Thanks!
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    Crypto Currency Mining a Giant Pyramid Scheme?

    Please read "The Deficit Myth" by economist Stephanie Kelton - we've all been lied to about the US debt. That's one lie that is disabused in the book mentioned above - all viable currencies must have an economy based on something other than the hope that more people "buy into" it. Physical...
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    Crypto Currency Mining a Giant Pyramid Scheme?

    Fiat currency (US dollar, et al) is backed (guaranteed) by the US (or others) governments physical and human resources. Crypto is basically a pyramid scheme because it is backed by nothing other than the hope that people will keep buying before the inevitable bursting bubble.
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    LiFePO4 heating pad for cold temperatures

    My conclusions so far is that these cells/batteries won't freeze (or develop cold-spots within them at all) quickly due to their mass. My trailer is unheated, partially shaded (~50% of the day) and parked outside nearby. The JBD/Overkill has a low temp charging cut-off set for 0 degrees...
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    DIY 24v 8s or 8s2p LifePo4 Bank and BMS Design ?

    Very nice setup! The toilet flange utilization is top notch. ;-)
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    CATL 271Ah cell issues.

    Looks like it is leaking? Any leaking cells (or those dinged up to this extent even if not leaking) I'd not mess with at all.
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    Separate system for Battery Heating pad

    Probably due to the ground temperature below the frost line (which varies by region and time of year) being higher than that at or above ground level when it gets near freezing temperatures outside. Depending on your location it can be above freezing a few feet (or more) below the surface all...
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    ABS Battery Box for 8S 280 ah 24 Volt Battery

    I've only assembled two, 280AH 12V batteries for my camp trailer, but with each I've used large cables with lugs on each end. It's more time consuming than solid busbars, of course, but because I had the materials and a hammer-powered crimper it worket out well. Are there any suppliers you know...
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    COMBINER BOX WIRING ENVIRONMENTAL EXPOSURE

    Yes - mine is much on an old, slightly beat-up 13' camp trailer and is much smaller scale but the concept is the same. PV wires from panels (red/black) come from roof and enter the bottom of the box, are combined, then exit to a wall gland into the battery compartment. So far it's been...
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    Why my system will not run my fridge?

    Probably, but I'm not sure how long it would take with the panels you have. A stand alone charger is not very expensive and likely faster. Either way, I wouldn't do anything else until the battery is fullly charged to 14.6V in order to rule out the battery. Let us know after you get it fully...
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    Why my system will not run my fridge?

    The specs on your inverter show that it has 3000W surge capacity. The fact that you can run the battery for a few minutes before the inverter shuts down at ~12.7 volts means that it's not a low voltage issue on the inverter, which specs show should do a low-voltage shut down at 10.5V, not 12.7V...
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    Why my system will not run my fridge?

    Are you charging the battery with just with a solar charge controller or are you using a stand-alone battery charger at first to get it topped off (around 14.6V)?
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    Why my system will not run my fridge?

    As short as you can make them and still reach. Have you fully charged the battery yet? If so, what resting voltage (disconnected for an hour or so) was it when it was done charging?
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    Why my system will not run my fridge?

    This is a confusing thread and I may have missed something, but: Did you fully charge your battery? What resting voltage (disconnected for an hour or so) was it when it was done charging? What I've read says that you're using the battery at 12.9V which is only about 30% charge. With the...
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    Brand New 12V 100Ah LiFePO4 Grade A W/ BMS & 3-Year Warranty For $399.99 Continental US Only. Shopvan.life

    Given the partial information from you here, the less than 100% favorable rating on eBay, not that many batteries sold by you, and the lack of low temperature protection, this battery seems a better deal.
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    Brand New 12V 100Ah LiFePO4 Grade A W/ BMS & 3-Year Warranty For $399.99 Continental US Only. Shopvan.life

    I could not find this username/store on eBay. The only Talentcell battery I fould for sale on eBay like the one you are showing on the website is here: Is that your battery?
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    Brand New 12V 100Ah LiFePO4 Grade A W/ BMS & 3-Year Warranty For $399.99 Continental US Only. Shopvan.life

    Does your battery have low-temp protection, ie cut-off charging below 0C / 32F degrees?
  18. S

    My 40ft 5th wheel 1020 Watt PV Build

    The picture I posted is SolarKimmy's batteries (I think)?
  19. S

    My 40ft 5th wheel 1020 Watt PV Build

    It looks like the tops of a few of the battery boxes may be ajar a bit on a few of them. Is this from being serviced and not yet re-secured?
  20. S

    EVE 280AH 12V Battery - Shenzhen Luyuan - Parallel Top Balance Timeline

    Update: I was going to wait until I built a compete battery box w/compression to place the battery cells into a series configuration with a BMS in order to finish charging, but decided to go ahead with just the cells clamped temporarily. After parallel charging @ 3.65V for 82 hours and resting...
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    Solar panel mounting on RV

    Seems so. Per powerstream.com: "The typical charging voltage [for a lead acid battery] is between 2.15 volts per cell (12.9 volts for a 12V 6 cell battery) and 2.35 volts per cell (14.1 volts for a 12V 6 cell battery)."
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    Unpleasant surprise

    It looks like the bottom half of the cells are adequately compressed by the two threaded rods, but the top half is not compressed much at all.
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    EVE 280AH 12V Battery - Shenzhen Luyuan - Parallel Top Balance Timeline

    Thanks for the feedback! Other than the alleged PS error, I'd thought that might be the case, but had no experience or confirmed information (as in someone else's specific timeline to reference) otherwise.
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    EVE 280AH 12V Battery - Shenzhen Luyuan - Parallel Top Balance Timeline

    This is the timeline I recorded when top balance my EVE 280AH cells I purchased from @Amy Wan (Luyuan) at Shenzhen Luyuan. Tools: Cheap 10A - 30V Power Supply (w/new 10 gauge leads and larger clips) Two tested multimeters - to confirm accuracy Patience Timeline: Paralleled cells and set PS...
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    Sine wave vs square wave

    What model number is it?
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    Introducing the New & Improved Shenzhen Luyuan Technology Co.

    I 'practiced' setting up, making the busbars, and charging/top balancing the first set of 280Ah cells I ordered that arrived damaged and these welded stud cells w/larger terminal posts/studs are a night and day difference. The damaged cells had the female threaded aluminum terminals which I used...
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    Introducing the New & Improved Shenzhen Luyuan Technology Co.

    There is a good, recent write-up here (that I cannot find right now :mad:) on what look like these exact cells. The gist: No heat issues. Ability to torque terminal nuts higher (10Nm?). Single busbars adequate for high loads. No problems reported.
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    Introducing the New & Improved Shenzhen Luyuan Technology Co.

    Update on ordering from Amy at the New & Improved Shenzhen Luyuan Technology Co.: Ordered 4 - 280Ah EVE cells with welded studs and busbars from Amy on 3/25/2021. They were shipped 4 business days later. First box of 2 cells arrived 6/7/2021 - perfect condition - flat, no dents or bulging...
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    Anyone purchased these Ultra Cheap 12v 100ah LiitoKala Battery?

    Looks like "Free Shipping to United States via Seller's Shipping Method" in that advertisement.
  30. S

    Faster than the wind going downwind?

    Fascinating. It seems legit, in that while you're moving as fast as the ambient volume of wind is, you're still always "in" the wind, which has mass and can be affected by the propeller in order to add propulsion. So long as the countervailing forces of drag don't exceed that amount of force...
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    Unwarranted Alibaba / AliExpress Transaction Service Fees?

    Thanks - for whatever reason, not in my case. Either of them. One has been refunded. The other is pending. It's definitely weird that others invoices show this fee clearly, but in several cases mine does not. Yes, when I asked who was getting the additional money, this is what Alibaba told...
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    Unwarranted Alibaba / AliExpress Transaction Service Fees?

    That may be the case, but again, In my case nowhere was this fee listed during the payment process. Not in the "Total Order Amount" (invoice) which is what you agree to pay the vendor, and not in the "Trade Assurance Purchase Contract." I have no issue paying for things that are clearly listed...
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    Unwarranted Alibaba / AliExpress Transaction Service Fees?

    Strange. On neither order did the fee show up on the invoice, it only shows the battery and shipping fees which was said to be the "Total Order Amount." It also doesn't show up at all in the "Trade Assurance Purchase Contract." Only on the credit card statement did the increase above what...
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    Xuba Electronics: DEAL - 280AH LiFePo4 cells. Purchase & Review

    One battery (4 cells) or one cell?
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