C10 batteries are rarely in ready stock with any dealer, one dealer who had it in stock back in December quoted a low price and the dates where within 2 months old, another dealer who doesn't normally deal with inverter batteries gave a even lower price then what ever is shown online, he has to order them from the distributor. So I am guessing it will be of newer stock.
This is how I was doing it for 9 years, I first visually determine which bottles have nil impurities in the shop,(when shell pumps used to sell them they where really good, they no longer sell it). I then use a TDS meter to determine the quality of water before pouring them into the battery. The distill water bottles that I get from a local HP petrol pump as some floating particles, which I filter it out. The TDS however is nearly zero.
I am already in the process of making my own distill water filter plant. Also experimented with rain water but never actually used it in battery.
Runtime chart from flin for gel/vrla/agm type c20 battery, PF 1 so va =watt.
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Some models can be monitored with a Ethernet via their proprietary adapter, some models like mine also has optional wifi and Cost 6k extra.
http://voltronicpower.com/en-US/Product/Detail/Wifi-Card and ethernet card http://voltronicpower.com/en-US/Product/Detail/SNMP-web-Card,-SNMP-Box
Some even use a long USB cable or Ethernet to RS232 adapter connected to a Ethernet wire. I will just use a atom based stick or a old laptop and use pc viewer from android.
Fan will get louder as the load increases, normally when running on AC it will be quiet. Many replace the fans with artic PC fans which are quieter.
I am also installing mine in a staircase room, so noise won't be an issue. I will be running a low powered 5 to 6 watt EC fan,( I am making a battery box since the nearly 58v dc is also lethal,) with a timer or a Hydrogen sensor. When solar is installed the fans will run only during solar charge period of roughly 9am to 5pm.
