My first project was a PHEV. It's also a charge by road hybrid (ICE drags the EV and it brakes [heavily] with the E motor). I built it with a friend.
I live in a very small town. And I have enough charge to actually drive it to Ace Hardware, Autozone, Oreilly, etc. All less than half a mile away... then come straight home lol. After that, I have to turn on the ICE. But it's great.
My biggest problem is I can't tell people about it. I can't tell ICE people it's a hybrid. The only shop that will touch it, is a tire shop. And I can't tell EV people it's a hybrid. Almost everyone is biased against the other side. It sucks, a lot. I basically have to approach my questions online without telling people of either.
I went with this for performance reasons and costs. If I didn't like it, I wouldn't build a pure EV. Obviously, range isn't an issue b/c I still have a very capable ICE up front. But being stranded while far from home is still a serious fear. The other day I was goofing around with it on a full charge, and then it was stuttering and acceleration was very weird. Eventually, it just quit accelerating under EV power. The whole system appeared to be powered on, regen braking still worked, but the EV accel. pedal just did nothing.
Well, something a small as a little pin in the plug for the EV pedal came out. The little barbs on the pin weren't sticking out enough to hold it in. It took me over an hour to find this when I got home. A stupid tiny pin. On top of that, the pin was under interior panels that all had to be removed. If it was pure EV, and I didn't have my tools, I'd be calling a tow truck.
Right now, I'm building electric mowers and helping them with solar setups in their sheds. I'm on #4. I usually build the batteries around the yard size. So far, EV mowers seems to be the way to go. Only drawback is charging is slow with these small solar setups. And mowing a neighbors yard, same day, isn't optional. Same range anxiety as an EV I'd assume. But mowing very early or when it's dang-near dark (avoiding Tx heat) is much better now.