Using batteries with your grid inverter
I have heard many homeowners moan about this problem they face. Thankfully, there is now an answer. Livint Technologies has launched a MPPT charger that will enable you to charge batteries using your existing solar panels and still be compatible with your existing system.
The new MPPT charger has an incredibly wide input voltage range from 60V-700V and will step it down anywhere between 24V and 72V. This means you can now store the excess power in a limited number of batteries. What's more this MPPT is compatible with any existing inverter too. You can know more about this at http://www.livintsolar.com/charge-controller