Linksys warns you only to use the provided power supply. A lot of the time where I live we depend on solar. This is from 12v batteries charged by the solar panels which is boosted to 220v by a power inverter. The power inverter periodically burns up transformer power supplies (all kinds) and the Linksys equipment is very difficult to replace. I have tried connecting the 12v system directly to the WAP54G and WRT54G (both of which are 12v), but they don't behave correctly. Why is this and is there any way I can get the direct 12v connection to work? It would be very convenient.