I just talked with a car audio shop in town and he thinks that adding a higher power amp to a Leaf can cause some problems. I have a 1500 watt amp and a single 12" sub, but he didn't even give me a quote to install the amp since he wasn't sure how it would affect the battery/charging. I saw that one of you installed a 1000 watt amp... how has that affected your cars electronic system and/or charging?