Pgk Pgk –
I don’t know what country you live in, but if in the UK…
Be Very Careful!
Please do verify this with Natural England (an amateur bat-group may be prone to “gold-plating”) but I am pretty sure it is ILLEGAL even to photograph a bat, let alone handle one, without a special licence.
…
Michael –
Unlikely the inverters would upset bats unless they (the inverters) emit a sound somewhere within the bats’ hearing range, so possibly confusing them.
Although such a sound is likely to be of low level at source, and the higher its frequency the shorter its range as increasing absorption adds to the inverse-square distance attenuation.
More likely your local bats have been driven away by the new housing-estates removing the insect habitats and roost sites on which the animals rely. I have seen them hawking around some blocks of flats near me, presumably having learnt the cluster of street and house lights attracts lots of nice juicy moths.