Most inverter failures we see in the field come down to four things: grid tolerance, thermal rating, battery comms, and monitoring. The brochure never highlights them. We do.
First, grid tolerance. A weak grid will swing from 180 V to 260 V on a normal afternoon in Lagos, Nairobi, or Lusaka. The inverter has to ride through that without disconnecting. Look at the spec sheet for the input voltage range and the frequency window. If it says 220 V plus or minus 10 percent, that is not enough. You want plus or minus 20 percent and a documented ride-through test result.
Second, thermal rating. Inverter losses turn into heat, and heat ages capacitors. A unit rated only for 25 degrees Celsius operating temperature will derate hard at 40 degrees. Look for a genuine high-temperature operating spec, not a marketing line. Ask the factory for a derating curve. If they do not have one, walk away.
Third, battery comms. CAN bus or RS485 with an open protocol is what you want. Closed protocols lock you into one battery brand, and that brand often changes pricing or availability. We have had customers with $20,000 worth of batteries stranded because their inverter vendor changed the comm handshake.
Fourth, monitoring. Buyers in Africa increasingly want phone-based monitoring, even on small systems. Make sure the inverter has an app or web portal that actually works on 3G, not just wifi. Test it on a slow connection before you commit to a brand.
One more thing we have learned the hard way: match the inverter continuous rating to your real load, not the nameplate peak. The peak number on a cheap inverter is what the unit can do for ten seconds before the protection cuts in. Undersizing is the number one cause of field trips.