[sswee]

I only have a problem with too cold a tank for a few days out of the year. A couple of cheap glass aquarium heaters should do the job. Although the colder temp will cause the voltage to be higher than normal, the current should flow. If it was not getting enough current at the max voltage, you need to double check your connections. You are just having the usual start up problems but will still have to do something on controlling the current.
SS