Yes, PLA 30% infill. Heat isn't going to be a problem. Probably would do PETG for a bit strong material, but not really concerned as I don't have huge holes in the yard.Looks really nice! Did you say what you used? Is it PLA?
Awesome! Wished there was a 10A version as well. Also curious if the voltage could be adjusted down like the one from Amazon?I'd definitely go for that 5A. I just cut my grass again and it wasn't wet and didn't need to go over it twice. 70% remaining after I cut!
I called them and they said it is not adjustable. From everything I've found, it seems that the standard LiFePO4 charger is set for a max voltage of 3.6 or 3.65V per cell. Adjustability does not seem to be a common parameter, which makes me wonder if I'm asking the wrong questions. And now the one you guys got from Amazon is out of stock. I may post a battery charge question in the DIY LifePO4 Battery Banks section of this forum. I guess my biggest misunderstanding is that I thought the consensus is not to charge routinely to 100% SoC if not necessary (rather, to 80 or 90%). From what @AMDPower said, it sounds like the folks at Overkill are suggesting that the BMS should not be used for limiting charge voltage. I'm guessing that in the DIY solar world this is somewhat moot since they're not charging their batteries from an outlet.Awesome! Wished there was a 10A version as well. Also curious if the voltage could be adjusted down like the one from Amazon?
Wow, I must admit I would have been very tempted if I saw it before purchasing my cells. But the money saved plus the learning experience is totally worth it.Did you guys see this? Possible drop in replacement. $1650 before shipping/taxes though.
In that case, perhaps BMS can also monitor cell voltage for you (given suitable max cell voltage and max imbalance between cells.) If it disconnects 48V output, that could control a relay to shut off AC to charger.
Nice! I also charged in series until first cell was over 3.5V then placed all cells in parallel and put on bench PSU set to 3.7 and left them for a few hours until amperage was down to ~0. I then disconnected the PSU and left the cells overnight connected in parallel. The next day I reconnected the cells in series.Cells have been slowly charging at 3A in series for about 20 hours now. The Overkill app estimates that they are at full SoC (based on current over time), but the cells voltages are still lagging. Based on the charge voltage curves, I expect these numbers will start rising sharply very soon. Once any cell gets to 3.55 I will put them in parallel and top balance.
I heard back from Overkill about using the overvoltage protection setting as a means to control the upper charge voltage. He said that while it is not ideal, it will work just fine. So if my charger voltage cannot be adjusted down from 58.4V, then my plan is to just set my overvoltage protection at 54V or so, with a much lower release so that it doesn't cycle back and forth.
Still looking around for a charger. I found this one that I like: AIMS 48V Charger, but at 19A it might be too much for the charge lines in the Ryobi, which are all 14 AWG. I may just resort to the 5A charger from EG4.
Hope to have this done by next weekend if life doesn't get in the way...