Post Hole Auger | Electric Options, any advice?

[Walkop]

I live in Ontario, Canada, and we do landscaping work in the GTA. We recently expanded into fences, and in this area the standard is 4 foot depth for concrete postholes. We have fairly heavy clay soil here. Example (about 20s long clip): https://youtu.be/amXq6yp28bg?t=342

 

I'm looking at purchasing a posthole digger instead of renting all the time. Most of our tools are electric, and I'm thinking it would make sense to go electric for this as well. Sad that Milwaukee doesn't have one - we even have the MX Fuel platform.

 

We need to dig 4-4.5' deep holes with 8" diameter for the posts, so they can be set in concrete with an 8" builders tube.

 

Most augers I see (Ryobi, Makita) seem to have decent power, but I never have seen them dig through clay soil. I also haven't seen them work for 4-4.5' deep applications in a northern climate. Has anyone either used them for this, or seen a video/review that addresses this?

 

I can go aftermarket for the auger and extension needed if need be (for greater than 2-3' you generally always need an extension), but I'm mainly interested if the motors and tools can handle the digging.

Thanks!

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Genesis Landscaping