I'm considering the option of plug-in solar to enhance my current solar+battery system. I already have an interconnect agreement with PG&E and a backup switch that prevents backflow during outages. My goal is to maximize power generation since I have two Powerwalls totaling 26kWh, but my solar setup is rated for 9kW and only produces about 5.5kWh on optimal days. I also charge electric vehicles and need more power. My roof is fully utilized with solar panels, so I'm looking for DIY options that can increase my power without disrupting my existing configuration.
2 Answers
You might want to think about extending your system by adding more panels directly to your Powerwalls if possible. Creating a carport or using your fence for additional panels could be a great way to boost your output without messing with what's already there.
Keep in mind that extending your system could require new approvals or changes to your Net Metering agreement. If PG&E sees unusual exports, they might flag it, especially if you're away and your system produces way more than expected.
It's curious that your 9kW system only gives you about 5.5 kWh on a good day. You may need to look into your energy usage to see if it’s affecting production. If you're under a NEM 2 agreement, you could tweak your Powerwall settings to maximize savings during peak hours instead of using grid power.
I think the production issue could be related to your roof's shading. Not all sections might be getting full sun exposure, which could explain why production caps at 5.5kWh. You might just be using what you generate, leading to the confusion about exports.
You’re correct! It’s important to keep electric code in mind, especially in California. Back-feeding from a shared circuit is a no-go, which can complicate adding more capacity.
I totally get your concerns! I'm in a similar spot. I want to add panels to my shed and fence without touching my existing warranty. Considering a separate plug-in solar system could be the way to go!