Need some guidance

[Ricky]

(06-23-2020 )Ricky Wrote:  So I have a 08 Prostar with a ISX and Ultrashift. I replaced the factory 1200 watt inverter with a Xantrex Freedom SW 3012 3000 watt inverter. I got it for 230.00 from a guy that upgraded his RV. It works great and has the control panel also. I did the upgrade because I use the inverter to run my roof mount AC. It's a Coleman rough neck 15000 btu and I installed a easy start. I only use it while driving and on high it pulls 1500 watts. When parked I have a generator that I use to run it. I do mostly short haul and I usually have my two French Mastiffs with me. That's why I like the roof mount, I have problems with the bunk AC. I used the setup last year with my 1200 watt inverter and just did the upgrade. It has been really muggy this year and the 1200 watt was kicking off. It used to only pull about 1150 watts but that was on low. But my issue is the new inverter is pulling the battery voltage (by the control panel) down to 10.9 at 1500 watts. Batteries are 1 1/2 old 950/1100 and are a good battery. Alternator is a 215 amp and is about the same age as the Batteries. So to keep from messing something up in the long run, what should I do. Bigger Alternator, deep cell batteries, both??? I talked with a place here about building a bigger Alternator from the old one I took off before. They said that they would have to look at it before they can tell how much they can bump it up (the numbers are not on it). What are the pros and cons doing that or buying bigger. My front AC works pretty good but the rear is a pain in the rear.

So, have been working like crazy but made some time today to get some things done. I got 4/0 wire from Fleetpride, guy cut me a great deal on 25 foot. They could only get the Delco 1600 and some change before taxes. Plus they had to special order it and wasn't sure how long. Didn't make sense but that's what he said. Had the local Truckpro order a Leese-neville 325 for 1100 and some change before taxes. Should have had it Saturday but it didn't get shipped so they said I would have it by Tuesday. I like what Waterloo said and upgrading the ground also. So yesterday I got 20 foot of 2/0 and 50 foot of loom. I started early morning and I am a bit picky so it took a while. But a friend stopped by when I was finishing up and said I should have been a mechanic.... not. I loomed hot and ground separate from alternator to batteries. Didn't loom from batteries to inverter. I slide a heavy piece of heater hose over each one where it goes through the floor. So everything looks good, all zip tide and covered. Also cleaned up a bunch of hots and grounds. I ran it a while like normal and it got down to 11.9. So it was really hot so I cranked it up to high and high fan. It did get down to 10.9 but it was pulling 1700 watts. So once I put the alternator and new belts on it should be great. I also put a longer wire on the controller and moved it up front. All in all I'm very pleased, but it was a lot of work doing it right. That and I guess my age is starting to catch up with me, lol.