Hey everyone! I'm diving into a new residential solar project and could really use some advice. I'm looking at setting up a rooftop solar system with around 18 kW of panels using the Solark 15k inverter along with either 14 kWh or 16 kWh batteries. This system will be grid-tied and I've got 200 amps of service from my utility.
My main concern is that I have two AC units (83 LRA and 71 LRA at 240V) and a pool. Plus, I charge my Tesla EV with a wall charger that's on a 60 amp breaker. On average, I use about 90 kWh per day during the summer. I'm worried that the Solark 15k might not handle the inrush current from everything starting up at once, although I doubt both AC units would kick on simultaneously. I'm okay with running the EV charger directly from the grid if needed, unless the Solark can manage combining grid and inverter power to provide more than 15 kW at once. Just wanted to get some insights on whether I'm on the right track or if there's a better option out there. I'd prefer to stay with a DC coupled system.
3 Answers
The Solark 15k can handle a brief surge up to 24 kW, which should accommodate your AC's inrush if they don’t start simultaneously. As for your EV charger, it’s fine to use it on grid power to prevent overloading the inverter. Just make sure your battery setup can handle your high usage!
When the grid is up, the Solark combines its power with the grid output, so you shouldn't have issues there. You might want to set up a separate panel for less critical loads that wouldn't run on the Solark, especially during outages to avoid overloading it.
You're correct that your AC units will draw additional power from the grid if needed. With 15 kWh of storage, though, you'll burn through that storage pretty quickly at night if your daily use is around 90 kWh. You might need to consider more batteries or an additional power management strategy.
I have a system similar to yours and was in the same boat. I initially had two wall-mounted batteries, but had to add a third to keep up with my nightly usage. It’s been a game changer!
I plan to use a couple of RUiXU Lithi2-16 batteries myself for extra storage.