Two gp27 for house, one gp24 for start, no windlass, no refrig. I buy them at Defender - not the cheapest (Walmart has better prices) but they seem to be decent batteries. Just checked them in the garage (home for the winter) and all are 'SportsMan' brand. The 27s are deep cycle, while the 24 is a start battery. I replace them when they die - don't worry about it too much.