, before completely giving up on your Mitsu EVSE
(which I believe is different than our 2012 EVSEs
as it has a 8A/12A selector switch), could you try simply testing your three-prong outlets to ensure they are properly wired with Neutral and Ground in the right place? Something like this would do the trick: https://www.amazon.com/dp/B071FVB35Q/ref=sspa_dk_detail_2
If you do end up needing to buy an EVSE
, and although you could buy a Level 1 unit which will do the job for under $150, you might consider something that has both 120vac and 240vac capability and has adjustable current. The advantage of having two voltage levels is that you can, for example, plug into a dryer outlet in a garage if you're visiting friends (I often do that with my i-MiEV) as well as having the slower 120vac wall outlet capability. The advantage of having adjustable current is to give you the ability to dial down (from the usual 12A) if you're using a 120vac outlet in an older home with marginal wiring.
Even though the i-MiEV only draws about 13A-14A @ 240vac (12A@120vac), in order to future-proof your EVSE
purchase, you might consider something a little more expensive but which has a 240vac 32A capability which would accommodate most modern EVs.