diy solar

diy solar

Never seen mentionned: Should a breaker simultaneously disconnect both solar input and output of solar charge controller ?

JFA

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Sep 27, 2022
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Montreal, Canada
Considering that most MPPTs/PWM chargers insist on connecting the battery before the pannels, should the charger-battery breaker be made double, with one set of contact also disconnecting the solar input if ever the breaker trips due to the charger-battery line , this to prevent damage to the charger ?
 
Considering that most MPPTs/PWM chargers insist on connecting the battery before the pannels, should the charger-battery breaker be made double, with one set of contact also disconnecting the solar input if ever the breaker trips due to the charger-battery line , this to prevent damage to the charger ?
Always disconnect PV array input to the charge controllers first, then, if desired, SCC output line to battery.
Depending on the SCC circuitry design, this both protects the SCC from damage and allows the SCC to sense battery voltage prior to PV power being applied.
 
Also highly depends on the quality of the charge controller. Victron can handle this. They even mention in the manual that trying to run a DC device directly off of the charge controller (no battery) won't work well because the MPPT algorithm may not adjust fast enough for it.
 
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