ken white wrote:
It looks like it needs about 2-3 volts of headroom so it is probably a series regulator.
You may be better off with an old school shunt regulator and only use it when equalizing the batteries.
Ken-
To counter the headroom problem, which would more efficient? A shunt regulator or 2 series regulators, 1 boost set for about 20v with a following buck set at maybe 12.5v in an RV 12v system.
Examples:
http://www.prodctodc.com/mini-dc-3732v-to-5734v-boost-converter-wide-voltage-regulator-power-supply-p-50.html
http://www.prodctodc.com/dc-732v-to-0828v-adjustable-step-down-power-supply-module-buck-converter-p-448.html
Please pardon the non-hot links.