PD9245 Charger/Converter & AGM's

9245 will be very good for your AGM batteries.

Dia hard platinums are Odyssey
Odyssey when deeply cycled specify 40 amps bulk charge per 100Ah of capacity, until 14.7v is reached and then hold 14.7 for more 4 hours.

The PD will not be ideal, but many batteries are treated worse

good question.....

My 8a24M Deka has a temp/volts chart in the manual.

Generally, AGM mfgrs strongly advise using temperature compensation chargers that increase charging volts at lower battery temps and conversely lower charging volts at higher battery temps. Battery life can be affected by over/under charging.

If your charger has a battery type selection, but not any temp comp, you might choose a battery type that best approximates this adjustment on a seasonal basis. I switch my solar controller between sealed(14.1V) and flooded(14.4) by using 14.1V during the hottest summer months when my batteries reach up to 110F.

HTH;
John

There is no difference in charging tween AGM and LA batts. All 3-4 stage converters are designed to handle either.