Just a thought, take a look at Rolls Surrette batteries, they have some really serious amp hour batteries, trouble is that you probably need a fork lift to move them and then there is the price, that's why I went to Costco and bought 20 GC2, 205 ah batteries, at that time they were $85 each and I think the core charge was $9. The last time I looked at GC2 batteries in Costco they had upped the amp hour rating to 210 and there price was over $90, these batteries and the ones we bought were Interstate brand, which we have found over the years to be a very good quality. By getting the batteries from Costco we've saved over $50 per battery, that's about a $1,000 per replacement cost, surely nothing to sneeze at, anyway who knows what the future will bring, there may be a time when replacement batteries are no longer available and candles for lighting and other forms of food storage will be needed other than refrigerators and freezers.