I've seen mention of Hall effect devices but I don't know anything about them.
#SOLAR BATTERY MONITOR HOW TO#
I guess a couple of 1% resistors could be needed to divide the voltage to the input range of the ADC?īut I'm not sure about how to measure the current. Once I've got an ADC setup working, measuring the voltage across the battery terminals is pretty simple. Some sort of ADC will be needed, and I'm considering a RaspIO Analog Zero I'll probably use a Zero W to allow for a wifi connection to the Internet. So far, I'm thinking that a Pi Zero is a good choice. The power consumption of the system needs to be kept fairly low, since it will be running from the 12V battery itself. The maximum current flow will probably be when the mains charger is in use.
It will be bidirectional, depending on whether the battery is charging or discharging. The current flowing will vary widely, from zero to perhaps 30A. There is also the option of measuring the raw voltage coming from the solar panels at some point in the future, which may be higher. The voltages will be in the range of about 10V to 14V - a nominal 12V lead-acid battery system. I may later want to add security cameras, motion detectors, GPS, etc - so I think a Pi is the way to go, rather than something like an Arduino.įocusing on the input side: the system needs to be able to measure current and voltage with reasonable accuracy. Ideally the data would be uploaded to the cloud so I can monitor it remotely - useful since the van is kept in storage some miles from home when we're not using it. I'd like to use a Pi to monitor the state of the battery - measuring voltage across its terminals and current flow. It is recharged by solar panels on the roof (when it's sunny!), the alternator (when the engine is running) or a mains charger (when we're connected to mains, at campsites). I own an old campervan with a 12V battery system, The battery powers lighting and a (fairly power-hungry) compression fridge - along with a 12V TV, phone chargers, etc. (First post here, hope I've posted this in the right place)
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