| Electronics > Repair |
| 24V / 1000W DC Power supply for lawn mower needed? |
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| CableTangle:
--- Quote from: eTobey on October 05, 2024, 10:23:19 pm ---Get one of these motorless lawnmowers. They are cheap, never run out of battery, and you dont need a gym then! :-+ --- End quote --- No thanks, i don't eat lawnmowers, and they might wander into the traffic ... |
| macboy:
I used to have a 24V lawn mower which used SLA lead batteries. Inside the removable battery case were two standard 12 V 20 Ah SLA batteries. I replaced them with new deep cycle ones when they failed. This cost less than half the price of an OEM replacement battery, which itself was about half the cost of the mower originally. Standard size SLA/AGM batteries can be purchased quite easily. I think I bought mine on amzn! Just 3 or 4 years later, the batteries failed again. I then replaced the mower with one which runs from two 18V Lithium battery packs which are compatible with my power tools (drill, etc.), but higher capacity. This mower is more powerful and runs longer than the lead powered one could ever do. When I mulch and bag my maple tree leaves in the fall, this mower sucks them up, finely chops them, and pushes them deep into the bag. The old mower just choked; the very idea of mulching leaves was laughable. When I did my kitchen reno, I appreciated having a couple of high capacity packs for my tools. This mower and its lithium packs have been going strong for about 7 years with no sign of fading. My mower came with a trimmer ('weed whacker') which uses the same battery pack. It, too, is more powerful than the NiCd powered one I replaced, and the batteries are so much easier to maintain (true maintenance free unlike either Ni or Pb ones). A more "permanent" and maintenance-free solution might be an AC powered electric mower. The most maintenance you might need is to patch up the extension cord after you run over it! I would not recommend trying to do an AC-DC conversion for your existing mower. The startup current usually peaks quite high, so you would need a very oversized supply. It might be worth looking into LiFePO4 based batteries to replace the Pb ones. As long as they can handle the peak and sustained currents, it should work well. You should be able to find them in the same form factor as the original batteries inside the battery case. Consider how you need to charge these, as the mower OEM charger is not likely suitable. Last note: with battery powered mowers, it is critically important to keep the blades sharp. Dull blades really cause drag on the motor, which drains the batteries much faster. If the blades can cleanly- and easily slice the grass, the mower will not only do a better job, but it will run much longer. I learned this the hard way. At one point I was convinced I needed to replace the batteries because I couldn't finish my yard, but after sharpening the blade, I easily >doubled the run time. |
| TimFox:
--- Quote from: eTobey on October 05, 2024, 10:23:19 pm ---Get one of these motorless lawnmowers. They are cheap, never run out of battery, and you dont need a gym then! :-+ --- End quote --- Forty years ago, when I was younger and we moved into our first house with lawns, I thought I could rely on a mechanical reel lawnmower from Sears. I quickly found that it would not cut grass if it was already too high (maybe 5 inches? I don't remember the exact value) due to its construction. Since I do not worship at the shrine of the immaculate lawn, but tried to keep the grass within reason, I had to get a corded electric mower that could actually deal with grass. Much later, I got a battery-operated mower to avoid the nuisance of long cords. |
| CableTangle:
--- Quote from: macboy on October 16, 2024, 03:46:52 pm ---I used to have a 24V lawn mower which used SLA lead batteries. Inside the removable battery case were two standard 12 V 20 Ah SLA batteries. I replaced them with new deep cycle ones when they failed. This cost less than half the price of an OEM replacement battery, which itself was about half the cost of the mower originally. Standard size SLA/AGM batteries can be purchased quite easily. --- End quote --- The store nearby where i buy the parts is not that cheap. I already opened the battery pack and it did have 2 12V batteries inside, but replacing them would have cost me as much as the lawn mower did cost. I wouldnt really trust Amazon with parts, since everyone can open a store there and dropship cheap crap or fakes from china... |
| Zucca:
I bet $50 your mower does not need 1KW unless it a riding on type.... Good thing they do not sell those lead heavy, poor energy density and short life 24V battery crap. Take the 18V or 80V LiIon battery from your other power tool and built an adapter for your mower. Normally a 24VDC output DC/DC Golf cart step down converter is cheap and reliable. Also you will be pleased to see how faster your battery will charge up... If you need the original battery to make the mower happy (battery handshake before starting up), here some inspiration for you. |
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