Most reacted posts

After trying a few solutions to the flex-able bus bar issue for mobile applications, I am now using these very flexible busbars https://www.aliexpress.com/item/1005002755728521.html?spm=a2g0s.12269583.0.0.548b4d2eq9IcCJ. These were also mentioned above in this forum thread. At around $4 usd a...

As the video is now gone, I'll try my best to summarize the video, so this thread can continue. Please feel free to correct me if have something wrong. Video shows a 270ah Battle Born with the corner of the case breached (blown out) and charred black. It seems like it has been off gassing...

I have a mixed view on Victron. I have a great inverter from them and Solar Charge controler ( although the inverted had 2x the advertised no-load draw). I have also had defective equipment from them (Orion dc-dc charger) and difficulty getting warranty support ( i gave up, perhaps my fault...

These are my EVE 280 cells with the CALB bus bars. These CALB bus bars were used to replace the solid buss bars that came with the EVE cells to hopefully allow for some movement btw cells. This is in a mobil application. Too bad they are not zinc plated. I use some dialectic grease on...

Dzi, much of the marine world uses alternators for charging LFP banks in conjunction with an external regulator, like the Balmar models. See for eg. the Marine How To lifepo4 articles or search "Stan Honey's Observation on lifepo4. " Seems to work fine for years for many if you limit bulk...

Electrodacus works well in some situations. It's more work and expense to install than a FET based BMS. It's a poor-man's REC. Good for 12 volt applications where you need high current rates that only a mechanical relay can provide. Has a screen so if that's a feature you want it's a...

Cinergi, this is a very interesting build you are undertaking and the use of the Orion BMS, the relay logic for LVC and the can bus communication is great to see evolve. I have also been watching your thread as I have four of the EVE 280 en route to me via ship from China and am somewhat...

Sorry about your LFP battery. Glad all is safe. I assume you need 12v DC and not just AC. Most Victron chargers (or inverter/charges) have a "power supply" mode which should allow you to power your RV's 12 volt systems while plugged into AC shore power. This mode will put out a steady 12.8...

Follow up on my original post. I ended up with the older Victron 1200va model (121220500) and it arrived last week. Seems very solid. See pic of internals below. No trouble with a 700 watt test load. Did not get hot at all. Fan noise is certainly there - but not excessive / annoying...

I had the same concern as you re. soild bus bars. I used the 70mm version of these instead. Note the holes are for M8 bolts, so a bit oversized. They also carry braided interconnects. https://amprevolt.com/collections/battery-accessories/products/prismatic-cell-lifepo4-busbar However, you...

I don't think Winstons have aluminium terminals (tinned copper i think) with big beefy M10 bolt. I used the Winston bus bars in a marine environment for 2 years and they were nothing but trouble - as they are made of un-tinned copper. I switched to Weber busbars which fixed a lot of...

Something I learned by reading the Nordkyn Design description of top balancing (in its comments section) is that when you are top balancing at a high / medium current and low voltage like 3.5 volts on big pack , you need really beefy and short cables or you will have excessive voltage drop and...

Old thread but I thought I would post here for anyone considering Frey cells. My Frey representative reached out recently and I took the opportunity to ask about the relative high IR of the Frey cells (both AC 1KH & on an a voltage drop basis). I provided a link to this forum thread, so they...

I am watching this space with interest as I have 4 EVE 280 cells ordered the end of October en route from Basen. My expectations are now tempered. Personally, I am less concerned about not reaching full capacity than having cells with high self discharge or significantly mismatched cells...

I have a thermal fuse taped on to each cell (4S , 12 volt) which will stop charging in the event a cell goes over 65C. It's independent of the BMS, so a charge cut-off of last resort. Not intended to protect the cells, intended to avoid a fire or off gassing.

When i watched the video, i got the impression (not fully clear) that he was relying on the BMS to shut down his charging and not the SCC's bulk/absorption setting. If so, i think that's a recipe for trouble. I only rely on my BMS as a back up, or in case a single cell goes significantly out...

You have done nothing wrong. Your BMS did its job and likely shut down charging when Cell # 4 hit 3.6v. You just need to follow rednectek's original suggestion and put the cells back in parallel and finish the top balance. Be very carful when you connect them (safety glasses and gloves) as...

OP, you cannot wire your pack like that with only 1 BMS. you can't have a bms's balance wire connected to 3 cells that are not in parallel with each other. You either need 3 BMSs or you need to put 3 cells in paralle first, and then in serises with the other 3-cell packs. As wired you...

yes this too seems to be another strategy. Presumably the DC-DC charger can handle an alternator load dump if the BMS kicks in. I have not tried it but seems like it would work...

Here is a video i discovered today showing the same busbars I purchased from Aliexpress (see above). Much better depiction than my snap shot and shows various options. Also demonstrates how flexible they are. Skip to minute 2;50. For the price, they seem to be a winner.

Yes I agree, i tried to make a compression fitting out of even thicker and harder plastics and it just tends to bend, which places all the pressure on the corners of the cells and not in the middle where you actually need the support. I suggest running the stainless rods through some cheap...

This may not be the best BMS for land based solar, but I still find this BMS compelling for the RV and Marine market given its ability to have separate charge and load disconnect. Boats for eg have big charge current and periodic large discharge demands (windlass for eg) and each needs to dealt...

What you are suggesting above is only a good idea if you measure the voltage at the battery terminal with the bench top power supply's current set zero or 100ma. The resistance in the wires will increase with current throughput, so you get a higher voltage drop at full current output giving...

I have no way to measure.... but they seem as hard or harder than the lug connections on cables. Hope that helps. Maybe try Nord-Lock washers?

Yes, it's four 12 volt, 270ah BB batteries in series to make 48 volts. There were two such 48v batteries in parallel (originally). After one battery had a partial blow out ( pretty extensive damage) the owner put 4 batteries back into service while waiting for the replacements. The video...

Not sure what the OPs meanth by this - but the Electrodacus bms is designed to be both a BMS and SCC. It requires the solar panel input voltage to be marginally higher than the battery voltage. The BMS controls solid state relays which turn on/off solar input ( it can also divert unused...

I have some EVE 280 cells on route and have been researching top balance methods for when they arrive. "Marine How To's" (Rod Collins) seems to me to be the most intuitive way to top balance. See: https://marinehowto.com/lifepo4-batteries-on-boats/. Warning - very long - you will have...

Upnorthandpersonal, your DIY braided busbars look great. I was also planing to use braided busbars for a mobile application, due to possible cell movement. There are some retail sellers of this style of bus bar of differing lengths. Hammick, are these for the EVE 280ah cells? Is there a...

I have a 400 ah, 4P4S pack on my test bench right now. So far it appears to charge and discharge with minimal cell drift. As an experiment, I have left balancing 'off' on the BMS to see how it behaves over time. It's still early days so outcome TBD. Like you I assume the cells in the 4P...