Hey everyone! I'm new to solar energy and I'm looking to utilize it to help save on some home expenses. I recently acquired a Bluetti AC300 which features a dual MPPT charge controller with a max input of 1200 Watts and 150 volts per input. I got a good deal on ten older solar panels for $100, but they're a mixed bag. Here's what I have:
- **SunPower SPR-215-WHT-U (2 panels)**: 215W (Vmp: 39.8V, Imp: 5.40A, Voc: 48.3V, Isc: 5.80A)
- **Mighty Max Solar MLS-150WM (1 panel)**: 150W (Vmp: 18.11V, Imp: 8.32A, Voc: 22.51V, Isc: 9.08A)
- **isofotón I-150S/24 (7 panels)**: 150W (Vmp: 34.6V, Imp: 4.35A, Voc: 43.2V, Isc: 4.45A)
I'm trying to figure out the best way to connect these panels. From my calculations, it seems I can only wire three of the isofotón panels in series per controller due to voltage limits. Can I connect them in parallel to manage the voltage? Ideally, I'd like to use all the panels or as many as I can. Any advice?
1 Answer
You could connect 6 of the isofotón panels in a 3s2p configuration (3 in series and 2 of those strings in parallel). Then, wire those in series with the SunPower panels. This way, you maximize output while keeping everything within safe voltage limits.
I’d be cautious about that setup. Bluetti has warned against exceeding the max Voc. If you run three isofotón panels in series, that’s 129.6V. Adding the SunPower panel would push you to 152.11V, which is over the limit. On cold days, the voltage can spike even higher. I’d suggest leaving one panel out.