Hey everyone! I'm diving into a project that might not be strictly solar-related, but I think this community might have the right insights. I've got 8.8kW of solar panels connected to my main panel, but I'm now planning to set up a UPS for some critical loads in my house. The goal is to power items like my network rack (about 300W continuously), sump pump, two refrigerators, a small freezer, and some LED lighting.
I have a nearly empty 240V subpanel fed by a 50A circuit from my main panel, and I'm considering moving these critical loads there and powering it with a Multiplus. Since I don't anticipate needing 240V for anything on the UPS, I'm leaning towards the Multiplus 2x120, which seems to offer flexibility for non-UPS circuits, but I want to confirm if my plan makes sense.
Here's how I'm thinking of wiring it up:
1. Switch the 50A feed from the main panel to the Multiplus.
2. Connect AC-out 1 from the Multiplus to the subpanel.
3. Hook up a 24V battery through a Lynx 1000 shunt.
4. Use a Cerbo GX for monitoring.
If this setup sounds solid, I have another question. How can I incorporate my 2000W Yamaha Inverter generator into this system for extended outages? I know if the 240V feed to the Multiplus goes down, it can still support 120V loads, but I'm curious about the logistics of using a 120V input with the Multiplus. Would it be beneficial to add a transfer switch between the main panel and the Multiplus? Looking forward to any advice you guys might have!
1 Answer
Your plan mostly works, but I'd suggest considering a different approach. Instead of the Multiplus, have you looked at using an EG4 XP6000 combined with a battery? It tends to be a more straightforward and effective solution. If you’re set on using a generator, remember that it’s better to have a dedicated battery charger to work alongside your generator rather than relying on the unit itself to handle that task. You'll likely save time and hassle in the long run!
That’s a great alternative. The EG4 does provide good efficiency, but I see your point about complexity. It all boils down to whether the Victron meets your specific needs now, especially since it handles a steady draw efficiently.