[Richard]

Let’s start with the issue in the title. The echo charger is not keeping the chassis batteries charged.

The echo charger is usually located on the driver side, in the bay with the inverter. It will be hidden with a small carpeted box. Look up high on the wall. If not there, look in compartment just to the right of the engine in the rear hatch.

First order of business is to determine if the fuse to the echo is blown or the fuse from the echo to the battery is blown.

Second, what do the led indicators on the echo show?

Third, is the echo getting 12V power?

Let’s start there.

The rest of your post is about the house system, and I am not sure if you are saying you have a problem there, or I missed the reason for all the additional info.