I purchased this Sagitar 300L flat panel solar water heater in December 2014. The price was 6580 yuan/unit, which was much more expensive than other brands. I thought the high price and quality of the export model should be. good, but I was disappointed! And the warranty period is only one year, and it has broken down four times after more than three years of use! And every time it was the electric heating tube and the bottom sensor that were broken, it cost 350 yuan to replace it once plus maintenance costs. After more than three years of use, the maintenance fees alone cost more than a thousand yuan! It is strongly recommended that when choosing a solar water heater, you never choose a five-star water heater! Any brand is better than that! I regret buying this crap, everyone should learn a lesson from it!
In your case, the instrument does not haveBuilt-in memory battery, so it will not remember previous settings if there is no power. Now how about resetting it and leaving it plugged in (if you experience a power outage, congratulations, you need to reset it). Otherwise, you can simply replace the drive with one that has a memory battery, so this problem won't exist!
Recommend "Dr. Sun" solar energy and Sancang solar energy (no need for water level probes and solenoid valves). Heating and hot water usage rates are fast in rainy weather, as is after-sales service. the rate is also significantly reduced, saving time and energy. This model only takes 20-30 minutes to heat up without sunlight, while a single warehouse one takes 2-3 hours!