Hi, I have a fair bit of experience setting up other inverters (Sol-Ark, Outback and GoodWe), but am having problems getting my friend's refurbished 3K V1 (from Signature Solar) to come up. He has 3 of the Lifepower4 V2 batteries. To get the inverter up so I can program it, I am just using one of the Lifepower4 batteries. I have the battery cables connected, and am getting 52.6V at the inverter, but when I turn it on, the LCD screen comes up, along with the three LEDs (all solid, 2 green, one red), and then it powers down. Any suggestions as to what may be wrong? It seems really simple, but am I missing something? Thanks in Advance