Which model is best to charge an ebike

We have two e assist bikes. A Yuba Spicy Curry with dual Bosch 500watt power packs and a Specialized with a 650 watt.battery. Both bikes are used for local trips/shopping/dog trailer towing etc.

In the garage current charging set up is aYeti 1300 with 2 100watt HSQ panels on the roof. This is sufficient for charging one bike every other day. Generally the bikes can go 3-4 days between charges and rarely run low at the same time.