Typically, 40 amps is the right amount of power for full electric vehicles that rely entirely on a car’s battery to get around. In these cases, drivers typically benefit most from having the fastest possible charge. Often, plug-in hybrid electric vehicles, which use both an onboard battery and a gas-powered engine, are less reliant on their battery to provide range, and thus drivers of these vehicles often opt for a 32 amp model. In some cases, your home’s electrical capacity may limit you to a 32 amp device. Always consult with an electrician when working with high-power electrical devices.