We have the HRDX controller which takes the 913 and upto 100W of solar.

Seems good and it split charges to two battery banks.

Apparently its not the most efficient solar regulator out there, but we regularly see 3 or 4 amps out of our 85W panel even covered in dust in NW England!

With the gales last weekend we saw 17 amps from the 913 whilst transmitting on the SSB - it was putting in more power than we could use even with the SSB on Tx!! There is a 20 amp fuse in the HRDX, so must have been very close to blowing it - mind you it was 67 mph winds!!

Jonny