Just ordered a clamp.
https://www.amazon.com/bayite-Digital-Current-Voltage-Transformer/dp/B01DDQM6Z4/ref=sr_1_11?dchild=1&keywords=dc+amp+meter&qid=1621442522&sr=8-11
I want to find out what total draw is anyway. I think you can do some reconditioning. Will have to look into it. I still...
Yeah, this is my BMS. It's pretty nice.
The Leoch battery that comes with the mower is rated at 600-700 cycles for 50% DOD. At half a charge cycle a week, even in winter, that would have been 24 years no? Definitely not 2.5 years. Anyway, the LiFePo4 is rated at 3000 full cycles. If I can...
Ahhhh!!!!! I just stripped my positive terminal. Damnit... I tried to rethread to M8 and then stripped again. Just bought a knock-off helicoil kit. From what I read here those work pretty good? Maybe I'll just order up a different meter too. @tentious did you say you saw a 150A peak...
OK. Here are the results. It reached full charge quicker than I thought. It's definitely not balanced but is this "way" off? Also, could I charge a single cell while in series with the pack or should it be completely physically removed?
Well, I got the new charger (getting that in one day from Amazon Prime feels like magic compared to 120 days for batteries from China!). I was originally going to reuse the charger cable and solder it to the new charger board because it has a nice long SO cable and the charger came with a...
After looking into building my own and the cost, I think I may end up going with the 100AH Ampere. Four of these would be 48V at $2000. It would provide plenty of current and is plug and play with the existing battery storage. Given that four new SLA batteries would run me $700, it seems like...
https://www.amazon.com/Runleader-Multifunction-Battery-Maintenance-Indicator/dp/B082CVXVSC/ref=sr_1_3?dchild=1&keywords=round+battery+meter+lifepo4&qid=1633360414&sr=8-3
Something like this might be easier/better. Voltage based only and configurable curve for battery type. Can just hook it up...
My guess is 56V. I can't charge right now because it's at max. The Ryobi charger just says 48V-13A but it's obviously not charging at 48V max. Here is the rest of the information from the BMS readout. I really think I need to dump the Ryobi charger. Everytime I get a cell overvoltage...
Mine was simply the charger connecting to the battery "live" and tripping the GFCI. I just make sure to attach the cable before turning the charger on and no problems occur.
The temperature sensor is two wire. It's pre-packaged with a lug attachment. Yes. It's a CV/CC bench power supply. I have larger clips with an SAE connector that I'll modify to hook up to my bench supply so I can have a quick connect handy for lugs and the larger clips. I've also got an...
I got this one and will compare. Also, check out the video review by a user! They put it in a Ryobi. The downside is they did have to widen the hole a bit.
Still waiting on batteries to come in for my Ryobi conversion. Interesting idea though. Haven't started on shed. Think I might not get enough sun but might get one panel to test.
Good job everybody! Just saw the new builds! They look great! Also, would like to report that I left mine off the charger all winter with the LED battery display powered and it basically didn't even budge. Ready to rock this year as well!
Great info. I taped half of mine with Kapton so I guess I'm half good :). Since we likely will not deplete to anywhere near zero and don't need to charge to 100, we'll probably be just fine either way right?
I just pulled the existing meter there is a six pin plug and a 4 pin opening. Only uses 3 pins. Trying to hunt down who actually makes this. Maybe the other pins are for different chemistry. I already have the bluetooth module on my BMS for accuracy. Personally, I just want a rough-ass look...
That arcing is definitely not cool. Was throwing my GFCI every time if I forgot to power it "off" first. Since I've already got my Raspberry Pi connected for monitoring, I think I'm going to automate a turn off of the WIFI switch when I reach 80% and turn back on when it goes below some other...
Well that was a bonehead thing of me. When I disassembled the handle, I didn't have the pins out far enough. It was barely making contact which arced and tripped the GFCI. Fixed that and the mower chargers properly! My cells are definitely more balanced. Everything looked perfect. I went to...
It reported cell overvoltage protection. You can see it at the top of the first image. Ahh... I thought the BMS just handled that. I gotta pull the specs on that charger. It looks like it is actually made by Delta-Q.
I have a step bit but not one that is 2". I used what I had on hand. I like that punch kit though. Might need to grab one of those for future projects. The steel for the mower panel looks like 1/8". Also, I just did a full cut with the new meter. Less than 1% difference in capacity between...
Also, this charger really isn't great quality. Especially scares me because when I plug in the unit while the switch is OFF, my lights in the shed dim for a sec from surge! Might just take it apart again and make sure they have the line wired properly.
@ryobilifepo4user Why are you using that tiny little charger? I think the proper procedure with "drop-in" LiFePo4 batteries is to hook them up in parallel for a few days (if supported) to let them balance. After which, just put them back in the mower and use the Ryobi charger. Yes, it may...
The overkill has no active cooling and didn't seem to get too hot. The internal sensor was a bit warmer than the two external sensors on the batteries. I have it stuffed in the plywood box and sandwiched between two pieces of foam. After a full mow it was just slightly above 30 degrees C and...