Request comments on simple solar charger

I've got an application where I would like to use 12V 7Ah SLA batteries
such as Powersonic PS-1270, with a solar charger. My device needs 24V
and it is desirable for the system to be able to monitor (coarsely) the
state of individual batteries as well as check the availability of
solar energy.

(Detail: There are actually two sets of batteries and solar cells, and
the system can switch them in and out according to their state of
charge).

Anyway: I've sketched a preliminary idea at
http://www.larwe.com/solardemo.png. The regulator shown is a
placeholder for any old LDO, the idea being to set the output for
around 13.6V and let the battery decide how much current to suck.

This isn't an ideal charger by any means, I realize, but it only has to
keep the batteries within 70% of nominal capacity for a year. After
that, it can die and I don't care.

Does my system look workable? Note that I don't care about discerning
the condition "solar good, battery bad" - I only want to know "battery
good/bad (solar cell offline)" and "solar cell Vout=good". Also not
shown, hysteresis resistors on the comparators, that's a minor detail.

.

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