I need help please. I’ve never weighed hives just hefted but want to start to be more objective …. I’m confused about weighing hives during winter … do you add up number and therefore rough weight of full frames of stores and then when the hive weight drops by something approaching That amount you feed ?
Don't make it more complicated than it is ... If you have been hefting then the three finger test is where you start.
1. If you can lift the hive with one finger - really in trouble very very light
2 If you can lift the hive with two fingers - bit on the light side
3. If, with three fingers, the hive feels like it's nailed to the ground then they are pretty much stocked.
So .. then, if you don't feel confident about hefting, you weigh the hive at it's maximum weight (ie: 3 above) and keep a record of weights at regular intervals (one week, two weeks, monthly - whatever suits you) and you can see how much they are getting through in weight as winter draws on and into spring.
I'm on 14 x 12 frames and a typical honey filled frame weighs about 8lbs. I aim to have around 40lbs of stores in each colony going into winter so that's at least 5 full frames and perhaps an arc of honey above the brood nest to see them through - I'm run Paynes Polys and they very rarely run out of stores before they start foraging again in spring.
If you have an empty hive with drawn frames you can weigh that, if you wish, but a frame of empty comb is generally about a pound in weight so, if you only have an empty brood box you can weigh that and have a good idea of what really empty is and avoid getting anywhere near that weight as winter progresses into spring.
If you really want to delve into it then you can start and take into account the weight of the bees but ... I just always err on the side of caution - the graph of the figures will tell you how much they are eating and if you start on the basis of having 40lbs to start with it's pretty straightforward to see when they are getting near datum .... and get the fondant out if they need feeding.