Hello, I am just wondering about the SunScreen print. After the 11 hours downtime, the battery will be empty, and as after that the mains power comes up, the internal 12V powersupply has to feed the circuit AND charge the battery. I wonder if that scenario is taken in account, because the internal 12V powersupply is very tiny and it is forbidden to add extra load ,fans etc, so the question is, can it handle the charge current?
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Hi Ben, Yes, this scenario was taken into account when we selected the board and verified it okay empirically. The setting that we use limits the charging power to 3W which is about 0.25A at 12V. There are actually 3 isolated outputs to the internal power supply of the Sun2000 (we are assuming it's the same for the Sun1000). The one that powers the inverter micro and its circuits is what ScreenScreen is backing up and using. That output should be able to supply at least 12W as the DC to DC converter used is rated 12W even though the inverter micro portion only uses about 1.5 W. So together it will be less than 5 W which should be no problem. The fan, LCD and control board are on the other outputs of the internal power supply so they shouldn't be affected by the charging of the battery. We did test it out at 0% and 50% SOC and it does max out at 3W charging and didn't affect the Sun2000's operation at all.