Mixing Battery Sizes
1. Is It Really a Good Idea?
So, you're thinking about connecting a 100Ah and 200Ah battery together? It's a question that pops up a lot, especially when expanding power systems for RVs, boats, or off-grid setups. The short answer is: technically, yes, you can. But should you? That's a much more involved discussion.
Think of batteries like runners in a race. One battery (the 100Ah) is like a sprinter, giving its all quickly, while the other (the 200Ah) is more like a marathoner, built for endurance. If you try to make them run together, the sprinter will tire out way faster, and the marathoner won't be able to perform at its peak.
The core problem stems from the difference in capacity and internal resistance. The smaller battery, being weaker, will work harder than the larger one. This can lead to overcharging and overheating of the smaller battery, significantly shortening its lifespan. In extreme cases, it could even cause damage to both batteries.
In essence, connecting batteries of different sizes is akin to putting different sized tires on your car. It may work for a short while, but ultimately will result in uneven wear and tear, and premature failure of some components. Battery health and longevity are important. Proper setup can result in better results and reliability.
