Most reacted posts

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...

Such calculations are possible, and there are several being made earlier in the Thread. I think it's better to measure the spring compression distance, times the spring rating per millimeter of compression, to determine the compressive force being applied by each spring. Tightening should be...

What you're now describing which could go through the "trailer battery charge" wire and return on the shared grounding wire of the Bargman cable (and plug) you already have. That's what I have, stepping up to 36V under the hood and running into a MPPT Solar controller (rather than a fixed...

Your configuration works, although the all-in one is stated to require mounting on a fire-resistant and nonconducting surface (concrete). Few if any RV "campers" have such mounting locations. Your equipment totals $1500 for battery, $750 for the combination charger/inverter unit, and another...

I don't know how the standard WFCO would react to a pure load, with no "battery" being present (to test whether it should be in Boost, Bulk, or Float mode). I am hoping that other converters (I have a PD) which do have a "Lithium charge" constant-voltage output would be willing to maintain that...

I'm not yet certain that your controllers are dead. When programming via the MT-50, you can't set lower-than-default charge and disconnect limits in the order they appear. Each change which you want to make has to maintain their rules of High-voltage Disconnect >= HV Reconnect >= Boost >= Float...

My own numbers are completely bogus after 17 days of run time. My very new JK BMS presents is presenting values for "Remain Battery" (percentage) and "Remaining Capacity" (AH) without regard to the measured cell voltages, and the values decline over time. Right now (after about 17 days of...

You could do that, but it harms the battery (somewhat) to draw the per-cell voltage down to "hit" the minimum value on most BMS systems. (They're typically defaulting to only 2.5v on each cell). Just wire them together with equal wire lengths, and with good (fairly tight) lug connections. A...

intresting Interesting upgrade by them. I would still NEVER consider a pre-built battery pack which couldn't be monitored and especially configured via a Bluetooth cellphone app.

A full and accurate response to this question is 'complicated'. If your load on all three batteries combined can ever exceed the maximum BMS capability of one single pack, then the cells AND their corresponding BMS units need to be protected by separate and expensive fast-acting Class-T" fuses...

Many of those circuit breakers are "too slow" to fail, and some will fail only once (and never accept a subsequent reset attempt). Some fuses are also too "slow", and some fuses have had the relatively disastrous problem of melting the sides together (rather than breaking the connection) in...

The rooftop A/C pulls far too much power for one battery. BattleBorn BMS allows 1C (100A) continuous draw, but also allows higher draw for very "peaks". IMO (and others may disagree), the BMS limit should be primary (lower in allowed current). In this scheme, your add-in fuses are only a...

The Balancing Test. (Passed, with flying colors). I "dragged" down the Voltage on the first cell of my battery pack, by connecting a high-wattage resistor on to that cell alone. BMS showed .4A of return current during that process. I pulled voltage to be about .06 low on on that cell. When I...

Just confirming what everyone else has emphasized, the shunt must be connected as the first component on the "P-" leads, although I am not sure that the Victron will actually provide any useful and additional information for you. In my own testing, with an accurate coulomb counter present, I...

Panels in parallel will have the Current of all panel added together, while the Voltage appears to the Controller as the Voltage of the lowest panel (i.e., the one in shade, if they are under different amounts of shade). Panels in Series have the Voltage of all panels added together, but the...

Nami, I have one more question of general interest: Does the heater port activate on the basis of temperature alone, or does it activate only for the case of low temperature WITH charging voltage present?

Very intriguing. Basen also appears to offer the same batteries for about $80 less when shipped by boat, with the normal lead time estimate of 15 handling + 35 shipping days. There is conflicting information at the top right of this listing, but I believe these would be shipped from California...

There is either something wrong with your connection to the batteries, or your EpEver is fried/failed. The first thing you should do is disconnect (and safely tape or cap) the Solar "+" wire first. Next, verify the battery voltage of each battery at the battery terminals. If the terminals show...

I'm glad to see that you're online. EpEver has a strict order in which you are allowed to change parameters. (You can't change a value, such as Boost Voltage, to a value which will exceed the "required to be >=-higher" parameter "high voltage disconnect", or fall below an existing value which is...

Rabbit, their "requirement" may be associated with an "ignition is on" sense signal failing to pass it's test (i.e., that "under the hood" Voltage confirms the engine to be running, and also high enough to allow for charging). If that is a separate wire, you could probably run Lishen battery...

Both the DThames suggestion with post terminals and your original link (with WAGO-type connectors included) would be excellent, and both of their resistors have tabs to be screwed down. But I would (and did) go with 25 Ohms, rather than 10.

You start by determining the maximum 120-VAC load which you "want" to be able to run, simultaneously. That must certainly be less than the continuous output capability of the Victron, but do you really need all 3000 Watts at once? That's about 25A, and too much for AWG-12 wiring (which is almost...

Maybe not a Daly (I have two). In my opinion - and I feel my opinion to be fairly expert - JBD and JK are superior. You can also buy a 'bigger' BMS, with better wiring connections and a higher Amp rating, then "tune down" the maximum discharge and charge current values to match your pack. A...

Gazoo, I have new and probably surprising information for you: These two pictures are actually of a rebuild, in which I took cells from a distorted 110Ah battery pack which I have been using since only late 2019. My new set of '120Ah' battery cells is finally unloading at the Port of Los...

This will be fine, and your two BMS units will allow up to 240A total. But you should take care to make your total length of lead-in wires (the sum of wire length to BMS "P-" and the wire length to reach "+" on the same battery) the same for each of two batteries, or else you will have less...

Kinda long, but worth reading (I hope) I have a one-way configuration, and it has been working great for many years. In my Trailer configuration, input to the EpEver "BN" MMPT is switched to be either the "real" solar panels, or the DC-DC "step-up" converter from the Engine Battery and...

I worded that badly, or I misunderstand myself: The measuring components of the "Shunt" device cannot handle the full capacity which the device is designed to take. Nearly all the current on my Coulomb Counter goes through a low-resistance casting, while only a tiny portion goes through the...

I would not use "precious" off-grid electric power to run the water heater, and a traditional propane furnace is also pretty effective in cold weather. I'm keeping propane in place for those purposes - although my LFP battery bank is less than half the size of yours. OTOH, I've got a normal...

Pure SWAG on my part: Maybe the capacitor charging "inrush" on the inverter approached the so-called "sparkle current" of the now-dead Daly, I understand "sparkle current" to be a fatal value (though I might be wrong about that). If Daly support can't tell the difference between a fatal...

With the highest respect (because you're THE BEST :giggle:) I must protest that Cell Voltages manifestly do relate to State of Charge, although the voltage changes which must be measured vary by relatively small amounts within most of the 'working range' of LFP battery cell voltages. Those...