Ideal battery bank size for a full-time RV solar rig?

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Choosing the Right Battery Bank Size When determining the ideal battery bank size for a full-time RV solar rig, several factors come into play. The total daily energy requirements of the RV, including lighting, appliances, and charging laptops, must be considered. A general rule of thumb is to calculate the total daily watt-hours (Wh) of energy needed, then divide by 12 to determine the required amp-hours (Ah).
For a full-time RV, a daily energy requirement of 50-100 kWh is common. To calculate the required battery bank size, divide this daily energy requirement by 12 to account for the 12-hour discharge rate: 50 kWh / 12 hours = 4167 Wh, or approximately 416.7 Ah. For a more conservative approach, multiply this value by 2-3 to account for inefficiencies and deep discharging: 416.7 Ah * 2 = 833.4 Ah. Therefore, a suitable battery bank size for a full-time RV solar rig would be in the range of 400-800 Ah.
Optimizing the Battery Bank Configuration The battery bank configuration should take into account the available space in the RV, the desired depth of discharge (DOD), and the type of batteries used. A common configuration for a full-time RV solar rig is a 24-volt system with two 6-volt deep cycle batteries connected in series. This configuration provides a stable 24-volt output and allows for a higher DOD, which is essential for deep cycle batteries. For a 400-800 Ah battery bank, a configuration of four to eight batteries in series and parallel can be used, depending on the available space and the desired Ah rating.
Inverter and Shore Power Integration When selecting an inverter for the RV solar rig, it’s essential to consider the total power requirements and the available shore power input. A suitable inverter should be rated for at least 2000-3000 watts of continuous power and 4000-6000 watts of peak power. Additionally, the inverter should have a built-in transfer switch that can automatically switch between solar power, shore power, and generator power. This ensures a seamless transition between power sources and prevents any power disruptions during generator operation.