For twenty-five years Bogart Engineering has made battery system monitors that give you more insight into your system. If you depend on batteries for power, their monitors show how full your batteries are, if charging sources are still charging like they used to, how fast your loads are drawing power, and to check whether your batteries are still storing energy as they should. Without an accurate monitor, you may be unaware of a problem until you run out of power.
Their new Solar Charger works with their new TriMetric TM-2030 Monitor (only) and offers unusually precise charging for longest battery life. Made in the USA!