(260 Ah/380 V)
Please correct me if I've got the math wrong. I'm not really familiar with this area.
260 Ah/380 V = 98,800 Wh, or 98.8kWh
Though I don't pay my own electricity bill, I looked the rate up for here in Halifax[1] and the rate is CAD$0.11796/kWh (flat rate).
That means you could charge this for about CAD$11.83. Not too shabby.
Also, if I'm reading this right, there is another option to pay based on time-of-day usage. The 11pm-7am option is CAD$0.06028/kWh[2], making the total roughly CAD$5.98 per charge.
[1] - http://www.nspower.ca/en/home/aboutnspi/ratesandregulations/...
[2] - http://www.nspower.ca/en/home/aboutnspi/ratesandregulations/...