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Yea the transformer has me the most suspicious. More so than the inductance on the lines in the grid panel. The transformer testing is something I did for the first time since I got it and while house was using basically zero power no less.. Otherwise nothing had changed in my house grid/off...

Yea same here. I personally made so many fail safes and design decisions to ensure that back feed would be impossible. And then of course they come knocking on my door. It would be very unfortunate if it was that transformer theory I mentioned. And had absolutely nothing to do with my solar...

At that point not much. I took most of those heavy loads off gird. The whole point right. AC, well, fridge, washing machine, etc nothing left on grid except for some lights, range, microwave and air compressor, just didn't want to squeeze my inverter. Anyway None where in use at the time. Now...

It is hybrid yes. Although it's supposed to only have grid interaction with the ac1 grid input. And not the ac2 gen input which is what I use when I do use it. But like I mentioned this was completely disconnected via contactor at the time. Which is why I suspect the induction theory.

Wow. This just happened to me, Although my case is slightly different and wondering what everyone's opinion is. Just got a visit from Poco saying I backfed. My first response was impossible....I have a 3pole contactor that is manually activated to connect grid to my ac input of my xantrex xw6048...

I think I understand what you're saying now, and it makes complete sense, the neutral break you referred to is between the actual transformer in the inverter and the input either AC1 or AC2 (it doesn't matter since all the N are tied together "I agree"). This bond is crucial to balance and sync...

Thanks for your feedback, what you wrote surprised me and had me second guess what I did, haha. I just dug into my XW manual and as I remember it explicitly states that there is no control over the N, switching or disconnecting, furthermore it states it does not connect it to ground and an...

In my case my contactor is a 3 pole, so I disconnect L1,L2 , and N so I have nothing but ground connecting my off grid system to the grid. Everything I have shares the same ground and a single ground rod. So since the N is disconnected from the grid panel when in off grid mode I made the N-G...

I don't see why not, however I'm not as familiar with the wiring setup for the 3phase. It's been working perfectly for me So far, although I've only had to use the grid 2 or 3 times. I did try the generator load shave function but it acted strange and didn't seem to work well so I left that...

I actually already have a 3 pole contactor that I'd use as the transfer switch, so that wouldn't have been the issue. But I do like the simplicity of what you describe. No N-G relay. So there is no possible way the inverter L1 ,L2 could somehow use the N from the grid as a return right. I...

Interesting idea, so you're saying I should connect the neutral from the output of the inverter and the grid neutral permanently. Then my N-G Bond would be in the grid panel like you said. At which point I would only switch L1 and L2 from grid in the rare case I need "shore power" to my loads...

Thanks for your input, that is what I thought as well. Very good thought, I actually plan on doing exactly that, however my inverter does not make or break any bonds with neutral and ground, it is all done in the circuit breaker panel. However I do plan on adding a contractor to break my off...

Hi Everyone, I've tried to read through tons of threads looking for a similar situation as mine and came up empty. Sorry if it's been answered already. I also made a quick sketch of what I believe I should do but hope someone can double check. To me it seems ok. So I have a XW6048 LF...

thanks for the feedback, I actually don't have either an insight device or a combox. I just use the good old fashioned SCP control panel, which is the reason behind my contactor/relay. Id have the auxiliary turn on the contactor when the battery falls below xx Volts. so it would all be hands...

Hi everyone, I know this is a slightly older topic/thread, and id guess you already have rectified this issue, but thought id throw my 2 cents in to see what you thought since it sounds like we are trying to achieve the same goal of NOT selling or back feeding to the grid.. I do have a...

I saw you mentioned you checked voltage at the cells. Were you testing on the buss bars by chance. Or the actual terminal. I had a similar issue with these same cells. Thought they were bad, had some that where way off in voltage under load, and resting was fine, and some even read high at...

Hi Everyone, So I've read a few threads about this already, but most seem to just ignore it since they are grid tied, and the power company doesn't care. My Setup is off Grid, So I am my own power company and waisted power is not ideal. So anyway, I am running 2 well pumps with my XW6048...

Yes I did. But I stopped at 3.55v. Current wasn't quite zero but fairly close. Then I let them sit paralleled overnight. I completely agree about a high resistance connection under load. Just can't wrap my head around why that same cell was the highest during charge.

Good idea. Ill move it while I redo the connection. It was approx 0.03 higher during charge. All the others were within 0.002 or so. And during a 20amp discharge for just a few minutes last night, with pack at 90%, it was almost 0.08 lower.

Did you ever figure this out. I have almost the exact same problem. Just got 16 105ah cells from18650 battery store so should be grade A cells. One is high during charging just like you described, and then that same one is low during discharge. Seems to settle to about the same voltage if no...

Not sure I noticed anyone mention the charge rate, most of the FLA batteries I've seen have a c/10 charge rate. Or 0.1C for a 3p arrangement that would be 111amps. You mention having 3x 80amp charges maxed out so pushing 240 amps. Maybe a contributing factor?

Well I finally got my 8 CATL 280 cells from Docan last week. Physically perfect condition, sides flat no swelling what so ever. I top balanced them to 3.55v (didn't feel the need to stress them all the way to 3.65v) and then discharged the full 280ah from them no problem. Discharge current was...

I agree, granted I have not received my cells yet. I would assume in the EV industry, physical space is very limited, so I could also believe they would reject any cell that does not meet the maximum AH/size they set forth. As far as these side code catl 280ah that are measuring upwards of...

Glad I found this thread about the catl280 side QR code. I have 8 of those exact cells on order from Docan but there was a delay in shipping. I was offered the EVE 280k instead for the same price, but turned them down because of all the negatives I've read about the eve280k having low capacity...

I agree a boat "ground" as you say is not really the same as in a car. Especially since it is all fiberglass. I still can't really see the benefit from a safety perspective of splitting the 96v pack, you still end up with 96v on the boat either way. However I do like the idea from a component...

Interesting idea. Only thing I don't follow is how you would ground the middle?. Connecting two batteries in series you get one positive and one negative at that middle "ground" point. So at the end of the day you will have one 48v bank with a positive ground and the other 48v bank with a...

Looks amazing, great job. I do have one question, as great as the battery boxes turned out, why so much concern about keeping them compressed? I was under the impression that only specific chemistries had to be compressed and LiFePo4 was not one of them? Please correct me or point me to a thread...

DIY EV routinely use greater than 48 volt for the traction packs (as far as I know), but I don't know what type of bms systems they use. I've never built one myself so am not sure. The efficiency bonus of the 96v pack would be nice but there doesn't seem to be many options for equipment like...