I will definitely try that vice trick. I have been taking a big pair of cutter pliers I guess is the political correct term for them these days. Almost got fired from one job for calling them the old name..
Anyway I cut in just a little right at the split, holding the pack in one hand as twist...
Thanks for the good review. I am targeting 20kwh for my tractor project so have ordered 1800 of these cells to finish the project. I have already collected about 350 of the green Panasonic cells in these packs from the medical cells i was ordering. They where in some cubes that where...
Just a quick update. I have been buying the used medical cells from battery hookup as the price seemed good. The last few days I finally did the testing for self discharging cells and sorted out about 1350 good cells that can be used in my peoject. I didn't keep great records of the shrinkage...
A gas motor is going to peak at torque somewhere around 1600 -2500 rpm. It will change some based on the compression ratio the higher the compression the higher the peak torque rpm rating. But at 5000 rpm the gas motor will probably have less than half the peak torque.
Using a quick internet...
For that application I would definitely look at designing for 14S 48 volts. That is the standard for most commercial inverters you would want to power. You could make standard packs of x cells and then put mutual of those in parallel later to upgrade the system. But the power you are talking...
What are you going to do with 1000 cells all in parallel? The current draw will be much higher than if you put then in serries groups to increase the voltage. Just wondering because you are looking at either some crazy long run time or some very high current and high current means bigger heat...
Diesel engines usually have a higher torque but an even more narrow torque band than a gas motor. So their sizing is still very different than an electric motor. That is why an 18 wheeler has so many gears to match the ground speed to the torque curve of the motor.
Electric motors typically...
The issue is you actually need to know the torque and rpm requirements for the load. Often gas motors are oversized to provide the torque at lower rpms. An electric motor has close to full torque at zero rpm so often you can reduce the motor size when sizing for the torque curve of an electric...
Unfortunately I can completely relate to your situation. I have an off grid system to install here this summer because if I stay on the gird I solar won't pay for itself in 20 years but if I leave the grid I can buy batteries and it will pay for itself in 9 years. More than half my electric...
I don't think you understood my point. I was saying mass production of things like 110vac lights and appliances makes it more cost effective to have an inverter in your off grid home that is running at grid voltage. It will be very expensive to get a DC dishwasher or refrigerator compared to...
Keith sorry I forgot his last name is the US distributor for KWeld. His contact is 18650shrink@gmail.com he was really nice about answering all my silly questions. I highly recommend working with him to order one. He involved my PayPal account for the order it was really easy
So you don't worry about over discharging the battery? I was worried I might get too excited spot welding and draw the battery too low.
Oh and I better add a good charger to my list if things I need to get...
I purchased a KWeld unit recently and bought the Turnigy graphene 6000Ah 3S 75C discharge battery to power it. I am just looking at setting it up today as I am collecting and testing enough batteries to start assembling a pack. I was just wondering looking at the battery what BMS would work in...
AC has less line losses than DC by a huge factor. Also the world is designed based on standard grid voltage. Simple mass production makes it cheaper to use the grid voltage and absorb the energy costs.
I think the point was simply that the cheap charger testers are not accurate enough to be useful. I have seen this myself I was going to toss a cell for testing > 600 on internal resistance only to have the cell slip out of my finger and the holder reseat to read below 100. Such a test is...
Something seems odd about your calculations but the best thing would be to try it out. I was just wondering how long a dewalt battery will run their led lights? I have a led lantern which isn't anything near that type of runtime I would say if it was fully charged a single day would kill it...
The biggest thing to watch for with over voltage on an electric motor would probably be arcing out for insulation failure. Which wil probably happen first with the internal air gaps. Higher voltage will mean lower current to provide the same power to the load. Of course if you put a heavier...
I wouldn't be surprised if the application you speak of uses AC power and simple rectifiers at the lights to get their 24vdc or the lights are depending on the LEDs to be the rectifier as that circuit is basically just diodes.
I installed a manufacturing production line once that someone else...
You have to get to the earth with grounding the roof won't help it will infact just make the risk more as your entire roof will rise the the floating voltage. You need to get a discharge path into the earth people get killed by floating voltage over 40 volts if I remember the OSHA safety...
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