I use Morningstar solar controllers with Low Voltage Disconnect (LVD). I started with an 85w solar panel and a 10A charger, but it was not enough to keep the batteries charged in the winter months during bad weather. Now I use 2 135w panels and a 20 amp charger. I have 2 routers on the system, but not those radios, so both my routers use about what your one router uses. http://www.solar-electric.com/chco.html
I use a single 125ah battery now, but it should be a little bigger for the winter.
The router is connected to the “Load” terminal on the solar controller. It will disconnect the load if the battery voltage drops below 10 volts. That will prevent damage to the router and battery due to undervoltage and deep discharge.
Here is a script that will help you monitor your battery charge state. Sends emails once a day, and once an hour if the battery voltage drops below a selectable minimum voltage. Requires a RB433ah or similar with the voltage monitor function. http://wiki.mikrotik.com/wiki/Monitor_input_voltage_on_RB333/433AH
And all this depends on your latitude. The farther away from the equator you are, the more you will need for the winter months.
Auckland, NZ sees about 5.6 hours of sunshine per day. I would be conservative and use 5 or less hours per day to calculate available charge time. The sun angle will not be optimum for all 5 hours. You should size your batteries to run the system for about 5 days without charging, then calculate the size of the panels required to charge that battery size.
In Alberta, Canada I mounted the panels vertical to allow snow to fall off more easily and to get better sun angle during the winter. This means that the system is way oversized during the summer months. Despite all of the calculations, the batteries can still drop too low during the winter due to extended periods of cloud. Of course, that only happens during the poorest of hiking weather
My system uses 4 x 180W panels and 4 x 120Ah batteries in series (48V) and a 60A Outback Charge Controller.
