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I thought I'd post this to help out my fellow diy battery builders. This battery box almost perfectly fits 4 x 304 (and 280ah as same size) batteries. The lid doesn't sit perfectly flush but it's not an issue as it sits on top of the batteries, so when you ratchet it down it holds it all tight...

on a little bit and on a lot

Make sure the bus bar is tight and has good contact. Maybe take it off and clean everything.

There’s no reason why you can’t adjust the calibration settings and get the readings identical (providing you’re sure smart shunt is more accurate)

here’s a dc vs ac test

i would guess partially tighter than finger tight, I did use a ratchet.

I messed up a thread big time so i couldn’t even helicoil it. I jb welded a grubscrew in the hole, zero threads. It’s still working fine after 6 months, on high loads 125 amps it voltage drops 0.03v more than the others, and I don’t want to tighten it and risk it breaking. Doesn’t heat up so I...

Yep you need the bluetooth dongle, or the computer software to program it. There isn't a setting on the MT50 controller.

I've done the same in my campervan but use the agm's for 12v which uses very little power but essential equipment, and the lifepo4 for the 240v. It does mean I have 2 of everything else, but does offer redundancy and low temp charging.

I agree they don't look like they have helicoils inside.

On solar farms the light reflected off the panel is aimed at the back of the one in front. Outside of a snow covered solar farm their practical use is limited, even car ports are mostly useless since the solar panels will shade the area underneath and no light will reflect to the underside. Flat...

If your cells are like mine then they have steel helicoils in them so aluminium bolts will actually be worse than just using steel.

Absolutely, anything over 14v is fully charged, there is very little capacity difference between 3.5v and 3.6v, you would witness this when charging as it takes only minutes to go from 3.5v to 3.6.v.

Whatever they are there isn't 4 of them

BB's don't have 4 cylindrical cells, they have numerous 18650's.

JBD Smart BMS (JBD-SP04S020) 4S (12V) 130A but using a relay to control inverter so max amps is 60A charge $71.77 Very Satisfied. I had 2 Daly BMS's which I think are crap in comparison. Aliexpress, DYKB store messed up the order and it cancelled a month after I ordered so went with thanksforyou...

I have 660w hooked up to the 4215 Epever Triron. The most watts I have seen, considering it's only been in use for a week was around 550w. You'll never get full power and 550w is probably around maximum anyway, most of the day the controller sits around 35amps so I'm not missing out on much. Go...

I used the deep hot dipped galvanized, but cut it up as I'd need to have bought the 6m lengths to accommodate the 3 solar panels, whereas cutting it let me do all panels with 1 x 3m length. I then used the shallow channel bolted to each panel to raise them up enough to get access to underneath...

This one works very well. I used it to top balance my cells, but I think it's better you don't leave it permanently attached. Reason being, when your batteries are in a low SOC it will bottom balance, then when it charges cells will keep hitting overvoltage until they top balance, repeat ad...

My advice which is what I've done is just use the bms for 12v applications and run the inverter with a relay providing it has a remote on/off switch. My max amps pull is around 135amps and this way I have full protection from the smart bms, and it only needs to handle my maxmium 12v which is...

Keep us updated. I have 660w running off the 40A epever triron and the most seen so far is around 37A. I think most people overestimate the capability of flat solar panels, they never reach full potential. Definitely relocate the panels away from shading though, otherwise don't bother buying a...

Yes there is. https://apps.apple.com/us/app/xiaoxiang-bms/id1375405426

I had this same problem, one errant cell that triggered the bms overvoltage shutoff with BLS 190ah batteries. I fixed this by installing the QNBBM active balancer: https://www.aliexpress.com/item/32995714086.html?spm=a2g0s.9042311.0.0.27424c4dG5BzA4 but it was still problematic, so what I did...

I have one of those. They're quite a bit cheaper on aliexpress, I don't think they're worth the amazon price. Mine has an annoying habit of sensing a small charge when there isn't one, keeps flicking between zero and an amp over and over which makes it useless, typical Chinese junk. I did have...

Anyone know the answer to this?

Read the manual for that version then.

You made that quite clear in the initial post and I'm suggesting you read the manual to find your answer. Here's a link to it. https://uk.renogy.com/renogy-rover-20-amp-mppt-solar-charge-controller/ For what it's worth I had a 310w solar panel on a charge controller and rarely saw over 20amps

I've only skimmed the manual, go through it all and you'll have your answer.

The charge controller will likely throw an error and remain that way until the power goes below 260w. Read the manual to see if it does what you want but it doesn't look like it to me.

260W max

Depends on the charge controller.

The terminals have steel threaded inserts in them, that is a helicoil, I replaced my broken one with the same thing, they’re m6. A grub screw is just the screw shaft so it lets you place a nut over the top, probably just has a different name where you are, blind screw perhaps. I put superglue on...

The bolts purely hold the cable to the top of the battery terminal, the size of the bolt is fairly irrelevant. Max torque is low, I pulled out one of the helicoils. I bought a helicoil kit and put the same size back in fairly ok, I then purchased longer grub screws as the ones supplied are too...

I bought these a few months back and they're as advertised. One thing I've noticed though in the pictures people post in the comments is the recent batches are different batteries. The middle circle is oval on mine and older ones, and the newer ones is a proper circle, so clearly different...

This is Sterlings manual.