alan_m wrote:

On 16/02/2019 10:28, Dave Liquorice wrote:


For the sensors they take very little energy, what are the batteries?
Tewrminal voltage might be good enough. I'd assume that there is some
method that gives a low battery warning for a given sensor.


Surely if its an expensive maintenance contract any non-rechargeable
batteries probably should be replaced yearly to ensure that the system
works reliably for a future 12 months?
That would be a bit of an expensive waste, especially if the likely
lifetime is about 10 years for a lightly loaded lithium primary cell.


--

Roger Hayter