I have a travel trailer with a medium size solar setup on it, and a grid-tie system on the house with enphase inverters.
I recently drug home a nice DC Solar trailer. Vegas to Michigan. A little bit crazy, but entertaining so far. I'm figuring out details of how I'd like to set up the components in the garage as a grid interactive / battery backup system. https://photos.app.goo.gl/qbVKkST35cJAB9Zc9
The inverters will allow me to run pretty much the whole house, just not particular things all at same time. Like the AC that we really never use, that load will stay on a grid only panel. Will leave the EVSE in the garage on the grid, but also be able to run it from the inverters. The main panel in the basement will be fed from the inverters output. When I want (weekend days off-peak, little value in sending power out to grid), I'll also be able to AC our existing 4.7kw system enphase inverters to feed back into the battery or house loads.
It has 2650 watts of 10 panels, two strings of 5 panels, which is a good match for the Midnite Classic 250 (CP model). The panels will go on the garage roof, or ground mount outside, with the CC inside with the 2 SMA inverters. Now the trailer is all disassembled. Today I took the rack off the trailer and moved it to the garden, I think I've settled on ground mounting with the existing frame racks in a line along the garden fence. Only have to buy 150 of wire and conduit, and it's semi-portable, vs hassle and materials to mount on roof which will need reshingling in 5-10yrs anyway. I'll mount the inverters in the garage tomorrow I hope, then start building a box around the batteries.
It has 2 forklift batteries on it. They are 24 cell, 48v, 540Ah rated, and 1900 pounds each. They will go in the garage because that's as far as I'll be lucky to move them, with a vented battery box around them. They were on this solar trailer since mid 2018 based on an inspection tag I found on the trailer, and I think just maintained by the Midnite CC some of that time. The CC shows 700 kwh lifetime, which would be an average of 2.5 kwh per day. The CC was turned off and the pack OCV was about 51 when I got it, and they needed some water added, the level was a little below the top of the plates. We'll see how they work out. So far they seem normal for the ambient temperatures and limited solar here, I charged the car a little from it a couple times.