Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 08, 2025 ...

Hey guys, we just got back from our first boon docking trip in the U320 and had a great time!  I got her put away and plugged in last night, came out this morning and heard a beeping.  The Xantrex control panel showed a fault, F9 Battery Voltage Too High.  Before we left, I had noticed that the panel showed 16.0V for the batteries at one point.  Today, they were showing 15.8V.

Looking through the manual, there is no adjustment available for the max voltage for charging.  You can change the amp limit, but not the target voltage.  My battery bank is 3 x Lifeline 8D's at 255Ah for 765Ah total.  Using their calculation (Total Ah / 5 for max output), the charger will put out the maximum 150A to the batteries.  The only setting I can change is the max charge rate, which is a % of the 150A charging capability.

With some searching online, I found a manual for the newer Xantrex SW 3012, which does have some voltage limits that are user adjustable.  I called Xantrex and these are not available for my older SW 3000.  Their solution is to upgrade the inverter/charger and control panel with new components. 

For now I've turned the max charge rate down to 75%, to see if that has an affect.  The inverter had already disabled the charging system, so I guess I won't know until I unplug from AC power, let the batts run down a little and then plug it back in.

Anything else I should be looking into?

I'm curious. Have you tried doing a hard reset on the system to see if it makes a difference?

Yes, in reply #13 of this thread, I mentioned that Xantrex told me to do that.  It didn't solve the issue.  In the end, the solar charge controller was the culprit.  Once replaced, everything is working perfectly.