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My stepdad retired and moved into an RV after my mother passed away. He is not very technically, minded and I am trying to come up with a user friendly setup for him to help with his travels. The existing RV is based on 12v but the inverter and battery setup needs a major retrofit. Based on...

Hola fellow photon pharmers. I am in the process of expanding my storage capacity closer to 200kWh to help handle cloudy days, and am considering adding some more panels to over panel to keep my usage as clean as possible. If I do this then there will be sunny days (weekends primarily) that I...

I have built several 16s Eve 304ah packs but am trying to wrap my head around how to get a lot of these packs in a small space while still being able to reach all of the terminals for troubleshooting/testing/tightening, etc. Ideally, I could mount them on their sides, terminals facing outwards...

This seems like something simple that has been done before, but apparently I suck at searching. I want to measure the voltage of a battery, and when it hits a certain voltage (full charge) it triggers a 240VAC 50A relay. Then when the voltage drops to a certain point, it triggers the relay...

I was trying to use Anderson power poles at first but found a solution that worked better for me for a lot less. Is this a common solution for splicing between bms and bus bars? $2 for up to 1/0

I am trying to set up a few dummy inverters at my office and limit the charge current dynamically in proportion to the output of my solar. I have already written some code that will let me pull data from the solar site, and I am also considering doing something similar with a direct read of the...

Off-grid, grounded with an 8' electrode to the main panel. 3x 5000ES (No screw, plan on adding insulation) Victron Autotransformer 100a fed by inverter panels through 20amp circuit breakers Main Panel fed by Autotransformer through main lugs I am trying to see where this goes wrong. (The AT has...

Here is the IR of some batteries I have, supposed to be same cells but obv some differences. What is the max range you would pair up hoping to keep them within reason, if you have a .6A balancing BMS (JK BMS) The ranges are from .48 to .79 IR, but most are clustered in .55 to .65 TIA!

Still working through charging discharging and testing these cells, using solar in the shipping container now so I built two 8 foot runs using two 60 amp chargers. Waste of time and money probably but it looks neat :)

26awg, 58v, 1 ft = voltage drop of .0051 26awg, 58v, .5 ft = voltage drop of .0025 My BMS claims to have read accuracy of .001 I believe, and my battery has each cell, typically within .001 to .01 volts of each other, typically .003 This would result in a difference of 2.6mV but significantly...

After yet another attempt at minimizing economic impact, CDC faced backlash for making a recommendation that goes against the science. In their own words they stated that the infected are contagious from 2-3 days before the onset of symptoms through 8 days after. Ignoring this 11 day period and...

I am in search of the following: 30kW of inverter (prefer parallel for redundancy at reduced kW) AC Coupling (I have Grid power, Microinverter power from roof, and generator power) DC Charging (48V , ~ 75kWh bank) I would also prefer to be able to program the batteries to feed back power into...

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In a few discussions recently it has been brought up time after time, over and over again. Some believe that since science is beyond us.... have you seen the COVID virus in a microscope to verify it is different than the flu?? That those who believe what scientists, studies, groups and...

There has been an influx of articles basically saying very little to nothing about this new variant. Did the same thing happen with Delta or is this being pushed in a weirdly aggressive and premature way? So far the general reporting is that it has a ton of mutations, but we don't know what...

***Note, this is not a thread to debate vaccines, just to discuss which booster shot combination might be best based on studies and medical advice** Now that the FDA has opened up boosters to all adults, does anyone have any updated study information...

Completely sunny days, south facing rooftop array, varying levels of sag. Top one was the coldest day, only difference I could see. Enphase IQ7 microinverter on each LG400N2W-V5 panel.

I did capacity test on 4 cells to test and found them all in the 308-312 range. I put together a 16s pack of 304a cells. First I top balanced them all to 3.6 together. At the start of testing they were all in the 3.431-3 range. After ~ 100ah discharge I had a low voltage shutoff by BMS. One cell...

Panel short circuit current rating is 3.84A Panel series fuse rating 15A Combiner using 15A fuses with 7AWG Panels hooked up with 10AWG Wire Can I combine multiple strings in parallel into a single fuse, and if so how many? My logic is that each string can't produce more than 3.84A, so even if...

I am working on several packs right now and will end up needing a total of ~ 30 BMS's I have an overkill solar BMS and ANT BMS and they both seem to work ok so far. I considered Batrium but keep backing out due to the price to cover this many packs. I have 2 16S packs that can output up to...

Currently considering three separate solar arrays and inverters for my home. One system on workshop , one system on pool house, and one system on house. The workshop would have 16KW of panels and 80kWh of storage, the pool house would have 5KW and 20;kWh of storage , the house would have 14KW...

I finished my more carpentry-based wall mount 2p16s module and decided after of futzing around with custom busbars it was time to consider some more automated and standardized options, at least before I build another dozen of them. So, lacking a 3d printer that could print a full 4x4 array of...

Didn't like the appearance, seems kinda silly but I like it. They will be displayed when mounted. Anyone else do wraps for fun or just heatshrink?

Put together a fire hazard with 2 higher amp adjustable Power Supplies, some rod holders from mcmaster carr, and aluminum bars. After doing a capacity test it takes around 6-8 hours to charge them up to full, swapping them out takes about 2-3 minutes. With 384 of these buggers I had to come up...

I am having a 14KW grid-tie system put in with microinverters on the roof converting to AC. I know I need an AC coupled system but my concerns are: 1) Having a big enough system to accept all of the power to charge the batteries (48v battery pack at 14KW means up to 300 amps of charging) 2)...

I understand that .2C is the general rule of thumb for discharge rate in testing capacity, my question is if my primary purpose is matching cells for capacity (especially when they might be used in a situation with higher than .2C discharge), is can I discharge at a higher C to get through the...

Have a lot of these to go through so bought some rod clips for quick connection / disconnection to top balance and then later to do capacity testing.

Going to cover the top of the shipping containers with some used panels, any input on which of the used panels on this site would be best for laying flat? https://shop.signaturesolar.us/collections/used-solar-panels Currently have an 80A MPPT that can do up to 245vdc so I was leaning towards...

I need to capacity test so I can match ~ 400 cells, is there a faster way to do this than limiting it to .2C ? I tried testing at .5C thinking I would adjust "expected" capacity and it would enable me to match cells, unfortunately this caused voltage sag below the 2.5V mark waaay too soon. These...

So I top balanced 4 cells to 3.5V with all very similar IR, then performed a ~ .3C discharge with them in 4s with a Xianxing type smart BMS. I discharged down to 10v and the final voltage of each cell was 1- 3.13V 2- 2.12V 3- 3.01V 4- 2.58V The pack hit ~ 95% of its rated capacity but one cell...

Per Overkill BMS, they cannot account for a large difference in Internal Resistance when it comes to balancing. Is there a general rule of thumb for accounting for differences in Internal Resistance? I have heard so little about this previously but in my first big foray into building a...

It basically breaks down to Pros and Cons, hoping for someone to fill in the blanks. (These are cylindrical cells so positive on one side, negative on other end) 14 cells in parallel blocks, then blocks connected in series 16S, 40kWh, Pros: No shorting terminals Batteries...

Updated and will provide results. Measuring 60280 right now, Capacity seems good but IR varies widely. Be careful and use a quality BMS that can handle a large differential or you can end up overcharging to failure.