I have a MultPlus 3000VA and a SmartSolar MPPT 100/20. Which is the cheapest way to have these products self-monitor the batteries internal temperature and use that feed-back to adjust their operation?
The Multi plus should come with a temperature sensor to attach to the battery negative. (Even if the manual says it is isolated - it isn't.) The MPPT uses its own temperature sensing, and needs to be within 5C of the battery temperature for correct compensation. If you want remote temperature sensing for the MPPT, this involves a lot of extra gear and expense. The Temperature compensation rate of the MPPT can be programmed, so if you have a big temperature difference, you could compensate by adjusting the battery voltage setpoints manually (custom battery setting).
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