When we first purchased our Niagara, we just transferred the battery and solar system from our old Starcraft. [see link]
Given that we were beginning to camp at times for up to 3 weeks in winter, with the chance of cloudy skies and little or no sun, it became necessary to upgrade our battery bank. The Interstate battery bank had a “useful” capacity of 75 amp hours (50% of total) and a pair of Trojan T-125 batteries would increase our useful capacity to 120 amp hour, which is a 60% increase in capacity.
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For a more detailed article, click here.