The HOMCOM 4FT Wheelchair Ramp seems like it would do a good job for electric wheelchairs, mainly because of its build. According to the manufacturer, it's made from anti-corrosive aluminum alloy, which should hold up well outdoors.
This type of aluminum naturally fights off rust and corrosion, so you'd be alright in various weather, even though it doesn't exactly shout 'waterproof'. But hey, it won't soak up water either, so you're in the clear for most conditions.
The ramp has a ribbed surface, which the manufacturer mentions is supposed to help with slip-resistance. This would come in handy during wet days, offering that extra grip to keep things safe. Our research shares some good points, with lots of folks saying it's pretty sturdy and performs well in the rain.
It does seem reliable for outdoor use. Though, just a heads up, there were a few mentions about it wobbling a bit in windy conditions. So, if you often get strong winds, that's something to think about.
Even though it's compact at 4FT, it’s supposed to be easy to move around, which is great. But like with anything left out in the elements, heavy rain over time might wear it down a bit.
Keeping it clean and giving it some regular care could really help with that. As long as you're a bit proactive, this ramp should be a solid choice for electric wheelchairs in different settings.