Ego Power has several sizes of batteries and two inverters. Their "Nexus" is probably overkill but it is also pure sine wave which most chargers recommend. The 7.5 AH battery has about 420 WH so two of them should fully charge an empty Levo battery.
Our plan is to ride a 68 mile roundtrip...
The only brand I know of is Tripp-Lite, quality products but $$$. It is possible your charger may not require pure sine wave, check with the supplier. It is difficult to tell what kind of startup power the charger may take but I would expect a 1000 w inverter to have no trouble with two 250 w...
Many power supplies call for pure sine wave. Some inverter suppliers call their products "pure sine wave" when they are not really, it may be best to get a name brand to be safe even though they are probably more $$. Two chargers could be a lot of amps. My charger (Levo SL) specifies about...