AEVA Forums

Last weekend I welded every last cell and glued the top and bottom covers on. Today was supposed to be the day I filled them with potting compound - EPL-9 which is a polyurethane elastomer with a hardness ideal for keeping batteries snug. My plan was to drill out the missing cell and use this as a ...

https://www.redbook.com.au/cars/details/2019-tesla-model-3-standard-range-plus-auto/SPOT-ITM-523036/ they say private sale between $50,000 and $54,000 with the new price listed as $66,000, I guess it goes up as the features go up but not much of a devaluation over the yrs at the moment. I guess if y...

No idea, I haven't been able to get in touch with Ben when I tried recently, the project that will use the Wavesculptor 200 and the EVO motor isn't anywhere near the starting gates due to higher than expected work loads, so it is all stuff for the future ..... the official old age pension date comes...

We used a similar set up to drive the 240vac hot water and when the thermostat cut in a second relay switch the air conditioner on. This is in our Hino minibus motor home, I put 6 x 270w Tindo solar panels on the roof ... because I had them and to make a summer roof for a dash trip to Perth in the h...

I just saw the torque curve on your AC motor and noticed that it drops very fast just before 2krpm. I am assuming the inverter is not using field weakening? Yeah, I saw that too, so I can't use the Tritium inverter with this motor if I want to run more than 450vdc so the max torque rpm would be up ...

I can see how the tensioner would work while driving, but the load on the chain is reversed on regen, what stops the tensioner being pulled down creating a lot of chain slack and gear damage? Also, in low gear where the torque is high, the moving gear segments slide on pins so all the torque goes th...

Hi George, what battery chemistry are you planning to use? I'm still keen to do an LTO power conversion for my Prius and expand the traction battery capacity so the regen has somewhere to go on the long down hill run into Adelaide .... and a fast recharge so we can get back home, the 8 hrs on the 24...

Terry ions stick in it and are not able to move so they are taken out of the total available ions . Capacity loss is what you see. I haven't experienced that with our systems and they are capacity tested every 3 yrs or so. The longest operating 24/7 as a house power battery that we've tested was 8 ...

I'm running some battery tests of 50Ah NCM cells (supposedly CATL) that are rated to be able to handle 5-8C. Pulling 200A / 4C out of these cells sees a voltage drop of about~1.6V (~0.5V per cell) from three cells in series with 12.3V of charge (3.7V nominal, 4.2V max per cell). The voltage ticks d...

I can offer a graph of discharge at different rates from EVPower which I found on their web site and which matches the experience and graphs I have produced doing similar tests .. I think the graphs given by re-sellers of cells are all imaginary creations to sell you. Its LFP technology so 3.2v nom...

I'm assuming these are for LFP ? If so the 3.65v is a max and no further no matter what anyone says . You are clogging the SEI layer just by being up at 3.65v . They should stay down at 3.4v because the majority of the capacity is within 3.0 volts and 3.4volts . Can they be adjusted down? How would...

Could an Admin please deletes these duplicates. I kept trying to post and kept getting an internal server error, but obviously the messages were going through! It’s a good point you make though. A number of manufacturers have developed platforms which they are now using to spin of many models. Vw a...

So the SP Pro reduces the solar charging current down to below the balancer current capability so the high cell voltage drops because some of the charge within that cell is either burnt off or moved to a lower voltage cell .... have I read that correctly? Once the high cell voltage drops to a safer ...

Yrs in the auto repair trade turned up lots of cases where a bell housing was somehow machined off centre destroying gearbox input shaft brgs or ring gear and starter gears due to misalignment. Had a friend who fitted a 4 sp Holden auto behind a Perkins diesel using an adaptor plate from a well resp...

Do you have a corresponding graph of the cell voltages? That is the important bit, as long as the cell voltages stay within the safe from damage range, state of charge is far less critical. Reducing the charging current at the 80% SOC mark would slow the remaining 20% recharging, much like a lead ac...

Looking at the funds allocation for NSW I can see where the non big city get their catch cry from, NSW, Newcastle, Sydney, Wollongong, the rest of the state gets ignored as usual. I guess the private sector will fill in the gaps for those unfortunate enough not to live in one of the three areas .......

The cells in my Vectrix have 2010 manufacture dates (Thundersky) and have been in daily use since 2010 (at ~2000 cycles now) and have 2/3rd of original capacity I agree, the shelf life is certainly longer than 10 years Hi Matt, what do you think has caused the capacity loss, I'm assuming you used t...

Sorry for resurrecting such an old thread, but I just recently found one of the Sinopoly cells I bought in the job lot from Ben all those yrs ago. The terminal voltage is still 3.388v and I think I remember Ben saying the cells had been in the boxes for 3 yrs, so that would make them over 10 yrs old...

I use 25mm (might be 20mm) stiff conduit, heat it with the hot air blower until I get it the correct shape, then push it into the square hole and heat the bit sticking inside so it is soft enough to flare it out so this keeps it in place. I put a gland nut in the end of the conduit with some glue to...

Something you need to consider is that if you use bricks from different packs you will need a much more powerful bypass to keep the cells balanced and you may need a balancer that shifts the energy instead of just dissipating it. .... and you can't rely on the cell balancer only to stop a cell grou...

There are cheaper BMS's around, they just have less fruit. If fruit is your thing Batrium has it by the ... bowl full. Hypothetically, what are these cheaper options? The cheap option has some cell balancing (around 0.5 amp max) and monitors terminal voltage rather than cell voltage. These units re...

Find someone who has replaced their battery pack in a DIY LiFeP04 conversion. Score 4 cells that hold better than 3v with a headlight bulb connected across the cell terminals for an hr, link them in series. Cut 3mm thick end plates, compress the pack together with a couple of G clamps and either str...

Absolutely mate, do you find yourself in WA very often? Only when trying to sort RV system problems ...twice to often :lol: but I'm sure we can organise a trucking mob we use sometimes to get the stuff to their depot in Adelaide. I'd love to have the time to do an actual tourist type trip over that...

At the moment I am doing an ex EV battery to home storage/solar/off peak recharge/power the air con system for David Koch (member of the SA branch) This battery pack is out of his Holden Barina DIY build, the blue CALB cells, around 6 yr old so should do just what he needs. Can't see why any ex EV b...

Or actually build proper cell voltage monitoring BMS systems so no cell goes under voltage or over voltage ...... one of the problems when using the more volatile lithium chemistries to get the max energy/kg. the safer lithium chemistries just fail after an extended abuse rather than catching fire ....