We need to use a battery storage system for measurement points with very low consumption (50mAHr on average).
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We usually use MPPT 75/10 but we see that in these case the quescient current can be a problem (25mA@12V), do you have a model with a very low self-consumption?
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On the other hand, in the case of batteries we rule out the use of Lithium because they work in negative temperatures below 0º. What batteries do you recommend AGM deep cycle or GEL deep cycle?