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Thank you for reading my diatribe! In recent years, USA reliability (i.e. availability of power to end users) has been significantly lower than that of many other countries. In 2021, US citizens had to deal with an average of 438 minutes of power outages per user per year and an average of...

I'm going to make a long and maybe too-comprehensive reply. Solar farms, large-scale battery-based storage facilities, and wind farms would all prefer to interface to an HVDC "grid" - but no such grid exists in the USA. (As far as I know, the only multi-point DC interconnect on this continent...

Yes.

The weight total of cells stacked into vertical rows, at only 5.6kg each, would create only a trivial addition in pressure on the bottom-most cell, in comparison to both the the minimum clamp requirement (about 306 KgF at sea level) and the maximum allowed (about 714KgF). Perhaps the assembly...

Cheap and easy (and I love the presence of a class-T fuse). But totally inadequate per EVE REQUIREMENTS. (The requirements, for better or worse, do specify 3000 Newtons of clamping force.)

YES! I strongly agree with this build strategy. Fixed length bus bars will stress the underlying terminals by holding the distance between alternating but adjacent cells "fixed" at the top, twisting the whole pack (free to strech a bit, lower down) in really bad ways. The cells will be damaged...

Yes, the two plates are cold rolled 1/4" steel plate, type "A36". The eBay seller cuts them clean, at low cost.https://www.ebay.com/itm/322748353721 There is a gigantic thread (384 posts long!) concerning the use of springs to optimize to 'optimize' the compression which is applied in a...

I recently purchased a set of EVE LF280K battery cells. I have built similar spring-loaded compression clamps in the past, but the 1/4" steel plate which I used in those boxes would tend to bend around the cells if I used the same "just the plates" approach this time. I also increased the number...

Your battery pack build could provide the minimum total force of clamping on the cell faces, but it has two issues: 1. Your assumption that 8 inch-pounds at the nut will correspond to 165 lbs of force with each rod. In order to reach that desired rod tensile force value (165 lbs), the nut must...

I will try to explain kin simple terms. If we consider a row of cells clamped together, large-face to large face (typically 4 8, or 16 cells, with a non-compressing additional insulator 'dividers' added between each one), the cells are all in a relatively fixed position, with only small amounts...

In my experience, Docan is best contacted by requesting to joini Amy Zheng's "private" FaceBooks Group. After your approval, you can exchange private messages - typically resulting in faster responses and better pricing. Here: "LiFePO4 Lithium Solar Battery Enthusiasts Group（Docan Amy)"

0truck0 had a lot of good comments in that post, but I add this 'reply' to clarify his guess at the amperage over the 7-pin interfacece. He is correct that nearly all fctory installed 7-pin interaces will only enable the the "Trailer Battery Charge" wire connection when the truck ignition is...

Hi, KS. Your post has two questions. For your first question, regarding unwanted discharge of the 5th wheel Lithiums (back into the the truck, when the truck isn't running) - You should generally just remove the Trailer's 7-pin cable from tow vehicle's interface socket, whenever you will be...

Hi. I have used the slightly 'smaller' BN3215 for several years (older firmware), and it runs MPPT in "Boost Mode" whenever the batteries are less than 99% full (withouth stopping). One value which I set a lot higher than they showed in this image (for "12v" batteries) is the "Boost Recon...

I have been delighted in purchasing from both Amy Wan (Luyuan) and from Amy Zheng (Docan). Other companies, not so much. In requesting a price from Docan, as well as Lyan, it is generally better to contact either of these persons directly (rather than purchase through the website). Better...

It is my understanding that that the operating voltage within the engine compartment will be allowed to "settle" to a voltage around 13.5 - 13.6 volts, with ECM regulating the alternator to maintain only that Voltage after it "thinks" the battery has been adequately re-filled from running the...

There are many reports of problems with less complex Renogy components on this board, and the usual summary is "friends don't let friends buy renogy". Their DC->DC controllers have had numerous "issues" reported, and their MPPT controllers have had even more problem reports. That unit combines...

There are many reports of problems with less complex Renogy components on this board, and the usual summary is "friends don't let friends buy renogy". Their DC->DC controllers have had numerous "issues" reported, and their MPPT controllers have had even more problem reports. That unit combines...

"Stock" trailer wiring in a Jeep (and within the 7-pin cable connecting your Trailer) can typically support more than 10A continuous current on the "Trailer Battery Charge" wire and the grounding return wire. But the current which will actually flow is limited by two factors: the relatively low...

The smaller 75/10 will reject "excess power" from the panel at times when when it is putting out more than about 150 watts. But that situation will occur only during a short portion of the day, rioght at noon, on a cloudless day. Let me make a new post concerning DC-to-DC charging from the Jeep.

sbsynco, I have just finished my very long post, which FINALLY answered your original question. This controller is OK for your larger panel, the maximum panel power "200 watts" will only exceed the capability of the controller under near-perfect conditions, and only for about 1/2 hour near noon...

Hi, sbsyncro - welcome to the forum. Your new battery pair can accept power (from the solar controller) at voltages up to 14.60 volts (3.65 volts in each of 4 cells) , although it is VERY SMART to configure the included JBD BMS units (Battery Management Systems) to stop accepting input charge...

Although the we don't know the X-scale in used the image charge/discharge image, I'm assuming that it is linear. The corresponding voltage curves of a capacitor are logarithmic, and there would be "a lot of weirdness" in in pulling power from parallel devices of the two types. It is generally...

upload date 01-11/2023, the document itself does not include any dates of approval or release.

I have reviewed that spc sheet, and made some posts on Amy's FB page. Here is my assessment, in comparson to a similar specification and test sheet for the newest EVE LFP 280AH cells (from earlier this year): The charging rule for these na-ion cells is: contant voltage at 3.95V (at up to .5C...

There are multiple issues which would be likely to affect the lifespan of your EVE cells in this configuration. DC outpt form alternators has a lot of ripple, and (from the photo of the booster unit) the two sets of capacitors (input and output) might be to small to more 'constant' and 'smooth'...

They did not test higher charge rates in the in cycle tests, but they did test discharge "energy efficiency" one time, comparing the .5c result to a 1.0c rate (896 watts). Their document only reduced the limits only in relation to lost capacity as the test cells became worn out: SOH limits, not...

Yes, the test procedure called for only ~6000 cycles with short rest periods, although the specification says 70% energy retention after 8000 cycles. The power rate for charge and discharge within each cycle was varied to even lower watts as the test battery cells become worn. I assume that the...

Your plan (to re-calibrate to the minimum 300 kgf at 15-20$ SOC) seems perfect, although I would add additional force to account for issues or of accuracy in my spring force calibration process. To the extent that their Engilish words (they provide the translaqtion themselves) are well-chosen...

Let me clarify a a couple of bits: They specified the 300 kgf clamp to be applied at SOC between 15% and 40% (not at "fully depleted" SOC, and not as low as you plan to push your cells). 15% SOC is already near the minimum limit which many of us try to enforce via BMS tuning, even though EVE ran...

I just downloaded the newer datasheet for EVE LF280K cells from June 2023 from here (thanks). On these cells, Eve applied a clamping force of 300 kgf for all tests. Elsewhere in the document (section 4.4.2), they describe a minimum of 3000 Newtons (roughly the same value, with gravity at sea...

If nothing lights up when you press buttons, then that picture (10:06 AM showing good battery connection voltage) implies that it is totally wrecked. Sorry!

Do you have an MT-50, or are you working only with the front panel display and buttons? I assume that you do have a volt meter - please post the voltage between your disconnected Solar "-" and Solar "+" wires, along with the voltage of your battery terminals wires.

No panels are built with voltage that low. Panels advertised for "12v" systems will typically have ''maximum power' voltages (with current) in rthe range of 1- 19 volts, and disconnect voltages in the range of 18-22 volts. If you wire them in series, the voltage becomes doubled. With that said...