When you are actively charging the batteries off a solar panel for example, it will be even higher, up to 17V 14.5V or so I think. The automotive PicoPSUs only cost a little more and will smooth it out up to 24V I think… there are even some models that go up to 48V.
Edit: why the down-votes? Is this incorrect?
Well I guess !climate@slrpnk.net !energy@slrpnk.net and !technology@slrpnk.net are already quite well known.
!balconygardening@slrpnk.net and !inperson@slrpnk.net are kinda cool as well. In general have a look at our community list, we have some good ones that are at least reasonably active.