I have an OLD set of stacked Xantrex SW2548 inverters mounted on my attached garage wall. I started hearing a hum coming from the top of two horizontally mounted inverters. Well I kept procrastinating on shutting down the inverter and see if I could clean the fan and get a mfg's name and part number. Today with the storm fast approaching and I was relegated to stay inside, I bypassed the inverters with the bypass switches and powered them down. Don't know how many years it has been since they were powered down last. I found the manual and looked for a parts list, no luck. There wasn't even anything in the manual that mentioned a fan. After getting the covers off I could not find a fan, but marveled how clean the inside was. I was still hearing a fan roar. Mounted just above the top inverter is an Iota 54.4V 15A battery charger. It has a fan and that was the fan hum I was hearing. No problem I have a spare charger in the shop and also another just like it in 12VCD. I will order a new fan from Iota and clean the dirt off this one to see if it quietens down. While I was looking at them I looked at the mfg date because I don't remember how OLD they are. They were manufactured in 2004 so that makes them about 17 years OLD!!!
You can see in the first picture the top inverter with the Iota battery charger above it. The fan is on the bottom of the charger. The outlet beside the charger is powered from my Shop system. When plugged in there I can charge batteries from shop inverter power. When plugged into the wall outlet where it is now, I can top off my batteries before an approaching storm using grid power. I use a DC circuit breaker to turn the charger on and off leaving the power cord plugged in. That is why I was hearing the fan.
