The CO/Propane detector is designed to alarm if the battery gets low. It is a safety feature to alert you to the fact that the supplied voltage is too low to adequately protect you should there be CO or propane. If this is occurring often while boonedocking, you may need to reassess your battery capacity/charging set up. Continually discharging your battery(s) too low will shorten their usable life. Look at adding another battery, larger capacity battery or solar.
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2 100W solar panels