In a situation where a battery must be used, it is important to sustain power to the water sampler—especially when the battery begins losing a significant amount of charge. Sampling personnel need to manually replace depleted batteries with a ready supply of fully charged batteries.
The frequency with which the batteries need to be replaced may be reduced by using solar panels. Solar panels are only a practical option, however, if there is enough available, consistent solar radiation at the sampling site.
If it is difficult to replace the batteries, solar power is not a practical option, or the water sampling system’s power requirements are great, then a deep-cycle rechargeable battery may be a suitable option.