Yes its odd to disconnect in that way with a decent sized charge load. But I could see myself using these for a camper or many other uses. I guess they have to protect against bad equipment and bad users. Which is probably the majority? If I was a manufacturer I might have 2 different lines of batteries. A basic, with features like Full Charge Protection and 10 year warranty, and a Pro version that might allow for a more savvy end user to set some parameters up as they desire but only give a 3 year warranty. Thanks for the details!

Good review - thx - the 300ah batteries are very inexpensive at $470 so going to give a couple a try

This is basically a video demonstrating the use of trim tabs.

I had a 300mV cell delta on my 300Ah V2 Epoch battery. I managed to figure out how to get the cells back into close balance relatively quickly but not sure why it happened in the first palce. I also had a runaway cell and one that initially would not go above 3.43 volts. I installed four epoch essentials 300Ah batteries in my friends boat, and during pre-charging each battery individually, i noticed similar behavior in one of the four batteries. It seems the sweet spot for charging is 13.9-14.0 volts on my battery as well. Im using a Victron IP43 charger, not an inverter charger.

What is that tape model? HSe ? I heard that's not compatible with this printer? Can you confirm?

With the property taxes there, you would think the public marinas would have been back in action by now. I believe work is still ongoing at Tarpon Point just south of here.

Sad to see there isn't more progress...but still a gorgeous riverfront!

And what happens if my battery dies?

Question on this breakdown- what is behind the mounting points at the base of the battery? How far in does the cell start? We were mounting our batteries with a custom bracket and realized the bolts we chose went deeper into the battery than the provided hardware by about 1/2 inch. Trying to figure out if we could have damaged a cell. It looked like there was plastic behind the mounting hole, would appreciate any help or details on what you found behind those holes!

And on systems with no Victron comms connected. Like mine.

gosh no matter how I squeeze mine it just bends and I can't open it lol

Charge MOSFET needs to turn for discharge in single port BMS. The charge and discharge mosfets are in series, they use their body diodes to allow discharge through the charge MOSFET even though its off, the body diodes cannot handle much current so it just uses that to sense discharge then quickly turns charge mosfet back on to support full current, then turns back off again if it senses charge. This is why you see the charge MOSFET turn on as soon as you put a load on.

Can you tear down the Epoch 48v marine battery? I’d love to see if that has an internal class T fuse also. And maybe test that 48v battery also.

“Knowing the fuse is inside the battery, an MRBF post-top fuse holder can now be safely used. Thus, the entire system is protected via the internal fuse, and the wire off the battery is protected by an appropriately sized MRBF on the positive terminal” which brand / model of the MRBF post-top fuse holder would you recommend and what size fuse fit one a 4/0 wire ?

Thanks for confirming 2P4S. The video seems to have simply cut, was that the end? Can you provide BMS details, any markings, is it a JDP passive?

Is this a 4S2P or 2P4S? Either way if the balancer is passive it may not be able to control balance in rather short order...

Great video, thanks for all the work in trying to help understand and mitigate the problem. Does your testing concern you at all, or do you think it’s manageable and /or possibly something they could fix somehow?

thank you

Thank you !!

So it wont push above displacement speed?

96v at at 40kw would be 400+ amps. How do they make that work? Anybody have insight? (Google says the Power Delivery cables would need to be 3/4 inch thick for just a 2 meter run) would love more info. extremely interested.

Can it print multiple lines or just one?

I. See identical behavior with SOK batteries, who seems tonhave similar balancing profiles. As I approach 3.4v per cell, things start to separate. A much slower finishing charge (or lower overall voltage) is needed to stop bms shut down. It seems passive balancing on big packs needs a ton of time or perfectly paired cells.

Interesting exploration. I have 2 Epoch 460’s in parallel, no Cerbo or DVCC, charging at a rather conservative 13.9 VDC, 13.4 Float & 13.25 Storage. Cell balancing so far, has been excellent (~ +/- 5 mV) & no alarms. I wonder if the DVCC / Multiplus Canbus interface is part of the problem? Maybe the KISS principle is worth adopting for these batteries?

Hey Ben. It just dawned on me. You were doing this test at 14.2 as a target voltage. Very close to 14 which is part of the threshold for charge mosfet disconnect. So as it crossed 14 towards 14.2 the amps dropped to meet the other part of the parameter and shut off the charge mosfet. Given that you have the interrogation software and can see balancing, try the following experiment. Repeat the same experiment, but turn up the voltage to 14.6. You should blast past 14.0 while still taking a significant current. Well above 3.5 amps. You will likely get 14.3-14.5 volts in the end but you should be able to observe cell balancing above 14.0 with your interrogation tool. Granted at that high of voltage it may not keep up but you should be able to see if its still occurring. This would give some good feedback. I essentially did this a number of times and got cells in the 3.6x range with cell deviation never going above .050. But I did not have the interrogation tool to see if balancing was still active. Il will wager $1 balancing will be active above 14.0 😀

Confuses the EMF signals

thanks for the video, been struggling with this same problem on an install, not been getting much help from epoch, despite calling multiple times over a few weeks time span, which is disappointing. they did say that balancing begins at 14.2 same as their 300ah v2 batteries. glad to see you've found its lower.

Thanks bunches Ben And Andre. This now confirms the details many of us suspected. It also allows us to confidently configure our charging parameters to avoid these conditions the first time instead of figuring it out the hard way, lol. One other thing to consider that I have recently seen... In the victron inverter chargers it has been observed that when max voltage of 13.9 is set in the DVCC an occasional over reach in voltage has been seen. Over reach just long enough to see the 14.0 and trigger this event. Which makes sense because if set at 13.9 the current will taper down to below 3.5 amps for a while and if the voltage even touches 14 for the few seconds it triggers the event since the current threshold is already met. Of course when we set 13.9 in the DVCC that a pretty round number, It would be nice if we could set 13.92 and the Victron have very tight control. But I think it can be a bit lax at times. So I have accepted 13.8 for my use to steer well clear. Doing this also avoids the larger cell deviation that seems to occur above this range where the balancing cant really keep up. Also, set at 13.8 and the charge mosfet NOT disconnecting you will be essentially absorbing for some period of time, which will result in pretty much 100 capacity. Regarding this shut down, IMO there is nothin inherently wrong with this happening since of course it is overcharge protection. The problem lies in the way that we cruisers want to use them, with solar, alternator charging etc that requires a perfectly stable system. The main thing I would like to see is the charge mosfet lock out reengagement threshold raised. Again...thanks for your persistence and sharing of information.

Pretty cool!

Ug, what a mess, The city marina next door looks the same.

What is the 0G bullseye graphic from? Is this an instrument?

Overall impression? -> noticeable pitch & roll improvements?

Wow! Thats a game changer and something I had not even thought of. It makes these batterries an even better deal.

It’s looks different than the current 460 sold on the Epoch website.

That's awesome! I agree the batteries are impressive, but it seams epoch doesn't know that much about them.

impressive. at 500A and 50k AIC, if that fuse blows...something has gone really wrong! It does make for installation ease and safety, especially if the fuse lugs can accommodate a more standard class T fuse as a replacement (after the cause of the blown fuse is remedied!!!!) I am looking forward to the full review (what cells, BMS features and configurability , documentation shortfalls/kudos, communication physical and configuration challenges, etc, etc). Allen Jones's videos have already shown that the CANbus cabling isn't standard--hydra cable and special undocumented hydra-slave battery cable instead of something like a daisy chain (the other Epoch battery series uses this) which is N2k-like. Let's hope that batteries like this are becoming the norm. They shouldn't be "drop in" but they should meet the safety standards when properly installed.

Use the A5 Die set and go up a notch on the adjustment wheel. Tool works fine.

Whats the speed?

I was triggered by the fact the excess of the strap cord on the wire in the lower left corner wasn't cut to make it all look clean :P Great system!

a more useful comparison would be between the FLIR thermal payload camera and the sionyx

will the NSX show engine hours?

use the adjustment wheel

I'm surprised it didn't hold the signal.. It was plenty big

Blah aweful video..

Just get the worlds brightest flash light

The image is much cleaner on the Omnisense. I have seen the higher end cameras side-by-side and felt Omnisense was superior in image quality.

which cartridge is it?

Ty for sharing this info. And including a snippet of video.

You can choose for one of the above gifts

Why not do auto guidance?