A: Yes, but you will find there is some confliction between the two technologies! They both work on the same principle using a CT clamp to measure the export from your Solar PV generation.
Most of our customers have removed the CT clamp of the water diverter and use the override boost function on the panel display of the water diverter first thing in the morning to allow the water to heat up to temperature. Once the water has hit its target temperature the solar water diverter will switch off, this will allow the batteries to take over and charge accordingly with any interference.
The other options our customer have chosen is to change the water diverter for a diverter that works with battery storage. There is one unit on the UK market that will work with batteries and is UK manufactured, The company is called intelligent Immersion
Here is a link to there website: Intelligent Immersion (intelligent-immersion.co.uk)