07-31-2017, 02:04 PM
inverter fix update.
russ, as you can see, there really isnt any room or ability to put a different kind of fan in it. there are pictures of the old and new fans below and if you do the math you will see the ones i put in are a little more powerful than the old ones.
i can say this is not something for the faint hearted. i could do it now in 3 hours or more but i assure you it took me way more than that this time. fortunately my inverter was only mounted a couple of feet in from the bay door. i did have to take the vacuum out to get at it though.
i soldered and heat shrinked the wires for the new fans to the wires for the old ones. i left way more wire than they had previously and just zip tied up the excess.
some of the bolts holding it together you cannot reach the way i did it on the bottom side so i used shop surgical instruments to hold the bolt up until i had it together and put the nut on. you can see them in the pictures.
one of the things to remember if you take out a prosine is that the mount on the wall stays there and the inverter hangs on it after taking the 3 bolts out on the bottom. then you loosen the 3 on the top and lift the inverter up and off the wall mount rails.
i tested the old fans and they were for sure bad (and very hard to turn by hand) and the new fans are bearing ones that will spin by blowing on them. i bought the fans a while ago and dont remember where i got them. but just match the ones that are in it. 80x80x25mm computer fans cw rotation. at least 40cfm and similar amperage or wattage....the old ones were 3000rpm and .13a the new ones were .23a. i have to believe that big inverter can power an extra quarter amp dc...
i had no way to test the inverter on the bench because the fans come on under load by a temperature sensor and not just when it is operating at low temps. so i put it all back together and installed it in the bay and turned it on. the fans did not come on until it was getting warm and then all three fans started purring.
i guess the test is that of time and if they keep it cool enough.
the last picture is of the sr71 print my son got me over the tv and home theatre in the man cave in the shop where i am sitting as i write this. if you zoom in you can see the newell through the window behind me...
life is good.
a 20 dollar fix rather than 2k.
tom
russ, as you can see, there really isnt any room or ability to put a different kind of fan in it. there are pictures of the old and new fans below and if you do the math you will see the ones i put in are a little more powerful than the old ones.
i can say this is not something for the faint hearted. i could do it now in 3 hours or more but i assure you it took me way more than that this time. fortunately my inverter was only mounted a couple of feet in from the bay door. i did have to take the vacuum out to get at it though.
i soldered and heat shrinked the wires for the new fans to the wires for the old ones. i left way more wire than they had previously and just zip tied up the excess.
some of the bolts holding it together you cannot reach the way i did it on the bottom side so i used shop surgical instruments to hold the bolt up until i had it together and put the nut on. you can see them in the pictures.
one of the things to remember if you take out a prosine is that the mount on the wall stays there and the inverter hangs on it after taking the 3 bolts out on the bottom. then you loosen the 3 on the top and lift the inverter up and off the wall mount rails.
i tested the old fans and they were for sure bad (and very hard to turn by hand) and the new fans are bearing ones that will spin by blowing on them. i bought the fans a while ago and dont remember where i got them. but just match the ones that are in it. 80x80x25mm computer fans cw rotation. at least 40cfm and similar amperage or wattage....the old ones were 3000rpm and .13a the new ones were .23a. i have to believe that big inverter can power an extra quarter amp dc...
i had no way to test the inverter on the bench because the fans come on under load by a temperature sensor and not just when it is operating at low temps. so i put it all back together and installed it in the bay and turned it on. the fans did not come on until it was getting warm and then all three fans started purring.
i guess the test is that of time and if they keep it cool enough.
the last picture is of the sr71 print my son got me over the tv and home theatre in the man cave in the shop where i am sitting as i write this. if you zoom in you can see the newell through the window behind me...
life is good.
a 20 dollar fix rather than 2k.
tom
2002 45'8" Newell Coach 608 Series 60 DDEC4/Allison World 6 Speed HD4000MH