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When we had our solar power station designed for Swan Reach we are advised of a couple of things which I think are pertinent here.
We were advised that the generator should be around 6kva in general to allow for good charging of batteries and this gives you a level of expansion into the future. Our system is pretty large at 79kwh of storage. We opted for a 11kva generator to allow welding and the like on site and for fast charging. The generator also has a autostart system installed so when the batteries get to down to a certain power level (we programme that) it will start up and commence charging the batteries.
Secondly we went with Vitron equipment and an inverter from them. The equipment decides how much power to provide for charging and this then prevents over charging. Generally up to 98% charge of the system it will work in bulk, then it will work in absorption and then finally in float at 99%. Paying for this piece of kit in the system was worth every cent. Our solar charger is a 150/100. The brains of the unit is the Gateway unit and that decides where power is coming from for charging and how much is needed. It can disregard the full solar panel system load.
I think it is worth discussing this with a Vitron Rep and get them to advise you what you actually need. You might actually be covered well now but you might also need more equipment to protect the system.
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