both good points! However the batteries will still be able to power the ANR when the sun is not available, and they can last 40hrs on batteries so that should be sufficient to have the sun available to be able to charge them up as well as have it power the ANR.....
I'm just no electrics whizz, so I'm not sure how I'd go about making sure all the voltages and amps match, would it even be possible to recharge the batteries at the same time as powering the ANR?