johnxhc wrote:
Interesting, so the battery balancer is better than DC-2-DC converter?
"Better" is hard to say for every situation. Internally a battery balancer is just a special arrangement of a DC-DC converter, with the output voltage set to always be one-half the input voltage (and so varying with the input voltage).
The advantages I know of for an RV with a 24V system over a straight 24V to 12V DC-DC converter are that the battery balancer only needs to supply half the 12V load on average, as the other half comes directly from that half of the battery bank. It also allows for transient loads greater than its rating since the instantaneous extra power can come from the battery, and then it gets rebalanced as time goes on. With some models, at least, you can also get some charging of the full 24V battery bank using a 12V charger.
The straight DC-DC converter has the advantages of a constant output voltage regardless of battery voltage, and in some cases galvanic isolation between the input and the output (though that's not typical). For a typical RV electrical system these are relatively unimportant, but in other applications they can be essential.
