We installed the system and it works just fine despite all the doubts. As you know. Shasta has full sun and virtually no clouds on 90% of the summer days. 80 percent of our heavy battery use occurs while there is full sun so the theoretical issues with "insufficient batteries" just doesn't show up in real life usage. Keep in mind that we monitor the system and the batteries so that we never have a problem. If we have a cloudy day, we just go lighter on the battery usage and use the generator if needed. In reality, I would say that is less than 10% of the days during the summer. We don't use the boat much during the winter so I am not concerned about multiple days with little to no sun putting a major strain on the batteries.
We are using 36 volt panels with no issue. Just be sure to use a good MPPT charge controller. These controllers will convert the 36 volts to 12 volts (14.4 Volts in reality ) with very little loss. That is why the MPPT controllers cost several times as much as the PWM controllers (which will convert to 12 volts, but lose 2/3 of the solar power in the process).
We are using 36 volt panels with no issue. Just be sure to use a good MPPT charge controller. These controllers will convert the 36 volts to 12 volts (14.4 Volts in reality ) with very little loss. That is why the MPPT controllers cost several times as much as the PWM controllers (which will convert to 12 volts, but lose 2/3 of the solar power in the process).
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