I purchased four 48V 100AH batteries to replace my old lead acid bank 48V system 6 weeks ago, so far I’m very happy with this new battery bank. I live off grid (alone) with most of my power needs being 240Vac, lighting, fridge & freezer, fans, including a washing machine, stereo, vacuum and the like, so far I have not drawn down more than 50% even following 2 days of minimal sun, I will be interesting to see how they perform in the winter months. I could not be happier with the professional service technical support and prompt delivery. Highly recommended.