I do think think running 48v will fry something, but I have not tried that.With over 20 versions produced over the years, the mid-sized Razor E300/E325 series scooter has enjoyed a long and fruitful production run. There maybe some resistance in the relay contacts, but they are rated at 40amps at 12v, they too do not seem to mind the additional voltage. When the relays are energized, The batteries are put in parallel and I can use a common 12v charger. In each scooter, I used 4 dpdt, Bosch relays to make a series/parallel switch, so when the relays are off, all three batteries are in series making 36v. The Chinese knock off is lighter and the 200w motor reacts very well to the additional 12v and this scooter will top out around 22mph. The heavy Razor would go about 13 to 14mph max at 24v, with new SLA's running at 36v it will max out at 19mpg (gps tested). Even the controllers rated at 24v running 36v do not get hot. I believe that the permanent magnet scooter motors are more robust than you would expect. I did not change the controller or anything else. adding 1 more battery to two scooters, one a Razor (250w motor) and the other a cheap Chinese made knock-off (200w motor), both being 24v original to 36v modified. I've always liked it, it's just reaching critical mass methinks. This can be done within a few hours (except charge time - you'll want a bit longer) Yes, I've been bit by eFever. Gel Cells aren't too sensitive to Charging at 1.5A (just make sure the temps stay low) 3. 24V motor appear to take the extra strain - likely shortening their expected lifetime 2. But truly, much faster than the 24V variant I was running before :D Proof of concept: 1. My front tire has a leak, that keeps getting bigger. It's faster - but it was a little slow to accelerate. I taped on my ammeter so I could monitor current flow Results? Yes. Once your dry run is successful - load everything into the scooter. The last thing you want is to accidentally short something. Before powering on, make sure all connections are tight - and insulated. It's also probably a good idea to do a "dry run"- without the motor connected to the rear wheel (VIA chain). When you wire everything together - connect the battery second to last, and the power switch last. It also served as a handy power indicator.01A draw means the controller is on (the switch circuit is closed). I used my ammeter between the batteries and the controller - this way I could monitor draw.
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March 2023
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