Actually, there are several other manufacturers of integrated 3-stage converter/AC breaker box/DC distribution combinations that I have seen. IOTA Engineering makes a nice combination unit and so does WFCO. While I would not give you 2¢ for anything from WFCO (read Chinese), the IOTA unit has a very good converter with it.
Parallax actually does make a fairly good converter…..the Paramode with TempAssure. This is actually a 3-stage charger with temperature compensation…….the ONLY converter that has temp/comp. This is a very important feature, as any standard converter's output is pegged at a standard of 77ºF and does not vary with battery temperature. (I don't use this product as I have heard of reliability problems with them…….YMMV!)
This puts you in the position of undercharging your batteries in low temperatures (even with 3-stage charging) and over-charging them in hot conditions, as charge voltages are dependent on battery temperature.
Also, there is no converter made that has adjustments for battery bank size and type. This is also necessary as different types of batteries (liquid lead acid, sealed and AGM) have different voltage requirements for proper charging. Another factor is the length of the charging stages. Bulk and absorb charges should be regulated by battery bank size and should not be one size fits all.
There is a solution though……….. INVERTER/CHARGERS
! These products (like the Magnum Energy selections) have great 4 stage chargers, are fully adjustable for size of battery bank, duration of the absorption charge, type of battery (charge voltage profile) AND are fully temperature compensated. Plus, you get the added benefit of having a fully integrated inverter to produce 120VAC from your batteries when off-grid. And BTW, They are made in the USA
and are all fully field serviceable.
It would seem to me that a premium (or so often described as such) item like an Airstream trailer would include inverter/chargers as standard equipment (like many other high end RVs do), along with a quality battery (NOT Interstate batteries
). It is amazing how many new owners opt for these upgrades soon after taking ownership and never look back.
I hope Airstream is listening!