Which two system holds up power 24VDC to 24 hours a day for at least 5 days in the event of no charge days- one of which is rated at 8.5 watts and another at 8.0watts allowing 10% wiggle room? In addition to that, that system should provide contact closures or something similar that tells us the battery is not charging or the battery is running low?
Yes we are running 24/7. We got a PLC in the box which will be reading two 4-20ma 2-wire transmitters, which the solar must also power, but their consumption is negligible in comparison to the PLC and the telemetry transmitter. If we can get charging state and low battery warning states into the PLC via a discrete input or similar, we will then transmit that data back to the operator via the elementary system
We dont stock any programmable battery monitors that output digital levels that can be fed into a PLC so we have to check if we can source this. We do stock full battery monitors but these have integrated comm to serial or wireless which would be unnecessary for you. One option would be to wire up an LVD or a solar charge controller with a circuit that could generate the appropriate voltage level for the PLC input rather than disconnect/ connect the load but I suspect there must be a more elegant solution which is what we are researching. The thing is this can be done we just need to figure out the best approach.
Do you have remote battery monitors with integrated com to serious wireless?