Victron Energy is a Dutch company, based in the Netherlands. They have been producing reliable power conversion equipment since 1975 and growing steadily. Victron is a good match for altE, as they cater their product offerings to common off-grid solutions like 24V mobile marine/RV systems and 48V whole-home systems.
Victron has a knack for making their products easy to hook up and set up, and they also provide extensive training opportunities on their products (they have presented at our Solar Installer Conferences many times - see below).