Got my order delivered last week. This morning I get a delivery of another two batteries. Confused about this, being my first solar installation, I contact them to say I already got my order and got another two batteries this morning, sent through photos of everything. Asked if this is a mistake, they reply that it looks good, no problem. So tried to do the right thing but I may or may not have received extra, sure looks that way to me. Will just store the two extras until they figure out their mistake, if it indeed is a mistake. Perhaps I paid for four? Maybe two is considered one unit. Fuck knows.