I have an Anker 757 unit powering a freezer and it works very well except for one problem. It is connected to the main electricity supply so charges battery etc. from the mains. Occasionally we have electricity outages mainly due to faults or maintenance. We are in a rural area. Sometimes the power will be off for an entire day and therefore the Anker will switch off when the battery runs flat. The problem arises when the power comes back on, the Anker will charge the battery but will not switch the AC through to the freezer as it has a soft switch thus the freezer does not get power until it is manually switched on at the Anker. How can I ensure that it does switch power through automatically? Possibly a modification. Thanks in advance