wrhartlerode
New Member
I've been using a SI 6048 which has been a/c coupled with an older SB 6000 in an offgird setup with no access to the grid. I used a mnx-240 autoformer and made an e-panel with surge protector. Everything has worked fine on it, but I am upgrading the system a bit. I would like to replace the SB 6000 with a sb 7.7 us 40 that I have or a sb 5.0 us 40, or possibly both? My question is if the mnx 240 autoformer would prevent me from switching to a sunny boy 7.7 us 40. I found a diagram stating it could be max 6kw. I like the idea of having 3 mppt and getting the benefit of oversizing my pv array. I only want to replace the 6000 with the 7.7 us 40 because I have it left over from another project. I guess the other route I could do is buy another SI 6048, and then I could run both the 7.7 and 5.0 and increase my pv array even more. The other option is that I don't need the 240v for my cabin now. I was wondering if I could use the SI 6048 and Sb 7.7 us 40 withought the autoformer and just run120v, but also the benefit of oversize pv. Does anyone have experience with this? Wanting to run it off grid coupled with the sunny boy. I do not have grid power at the place. Just trying to maximize my system using what I have.