We wouldn’t be the best folks to check with about technical & design issues (get in contact having an installer as an alternative), but Sure you should be able to use battery power during the night time – that’s what it’s for! Utility companies in Washington offer sound Web metering https://solarinstallerswa.video.blog/2024/09/19/the-comprehensive-guide-to-a-7-7kw-solar-system-in-western-australia/