Something I figured out in the heat of the day, during Stage 2 of the BC2BC rally - using water to cool down the PEM while charging. Is this a well known trick for helping along the charging process on a hot day, and I'm just late to the party?
http://asokasblog.wordpress.com/2013/07/03/liquid-cooled-roadster-pem/
For anybody who doesn't yet know about this, I have good news and bad news. The bad news is that it appears it can get hot enough outside that the battery will be fine, but the charging system will slow down the rate at which it recharges the battery. The good news is that the Roadster PEM has a flat top and is easily accessible (open the trunk), and that means you can keep it damp / wet to help it radiate that heat away.
For standing water, what I did was use a wet cloth and squeeze the water out onto the PEM (rather than trying to pour water from a bottle). Much better control over how much water gets onto the surface and how far it spreads. You need a flattish surface, and if any of this is sounding way out there for you, then maybe just consider a wet cloth and keeping your PEM excessively clean (and damp) while it's charging
http://asokasblog.wordpress.com/2013/07/03/liquid-cooled-roadster-pem/
For anybody who doesn't yet know about this, I have good news and bad news. The bad news is that it appears it can get hot enough outside that the battery will be fine, but the charging system will slow down the rate at which it recharges the battery. The good news is that the Roadster PEM has a flat top and is easily accessible (open the trunk), and that means you can keep it damp / wet to help it radiate that heat away.
For standing water, what I did was use a wet cloth and squeeze the water out onto the PEM (rather than trying to pour water from a bottle). Much better control over how much water gets onto the surface and how far it spreads. You need a flattish surface, and if any of this is sounding way out there for you, then maybe just consider a wet cloth and keeping your PEM excessively clean (and damp) while it's charging