3 ms·

Thanks. These are a little big (100Ah, 200Ah, 50Ah...), heavy and expensive compared to what I'm looking for. For reference, I'm currently using a 5W panel, an

by cuu508 2y ago

Thanks. These are a little big (100Ah, 200Ah, 50Ah...), heavy and expensive compared to what I'm looking for. For reference, I'm currently using a 5W panel, and a single 18650 element, costing a few dollars from AliExpress. Works fine for my usecase (Meshtastic nodes) except for the charging below 0°C thing.

wongarsu 2y ago
At that scale you are probably better off building your own solution: a low-power microcontroller with a temperature sensor, a small heating element (search "heating foil"), some voltage sensing with the ADC on the battery and solar panels, and a bit of simple logic. If you are mostly concerned with low-temperature charging you could even power all that from the charging side only.
- lazide 2y ago
  At 5w, a simple temperature sensitive switch, 5w resistor, and some wraps of insulation might be enough. If below x temp, just shunt all current to the resistor, otherwise power the charger.