Originally Posted by Mark Lee
It makes sense that the Univolt is on its way out. My use is full time and high. But there are several sizes of the Iota. Now what size should I look into ? Can the big unit be to big?
First, I would recommend checking out the info on this website.
BestConverter - Converters, Inverters, Electrical Supplies, Electronics
There is a lot of good information on converters located there.
If you are in a pinch and the converter goes completely out, you can disconnect the converter from from the AC. Perhaps just turn the circuit breaker off. Depending on what happened to the converter, you may also need to disconnect the DC output wires as well. That can be simple or difficult depending on how it is wired. You can then hook an ordinary battery charger to your battery for a few to several hours at at time when things start to get dim.
Since this is a long term investment, I don't think you want to make a rush selection.
Randy, the owner of Best converter can give you good advice. He may even answer the phone on a Sunday.
As far as output (amps) goes, you can't buy one too big. However there may be physical size considerations and of course possible unnecessary investment. The biggest job a converter has to perform is recharging the batteries after you have been running without shore power for a significant time. The only time a converter is doing anything is when you are hooked to shore power. Aside from charging the batteries, the biggest single current draw is probably the furnace fan. I would just be sure to get a unit with at least the capacity of the one you are replacing.