Yup, I have the same arrangement as paulbrown22.
This seems to be the preferred arrangement as:
-I have had the consumer battery die, as it had been for months on a marina berth and had totally discharged when the auto-pump engaged. Nevertheless I was able to start the engine with the "main" battery and recharge the consumer on along run up the the Scottish Isles.
-Conversely I can start the engine from the consumer when the main one fails. That also recharges itself on a long run.
Takes about 5 hours of running before it totally recharges.
"Ribbing-the most expensive way of traveling third class"