PD4655 Charging Graph
I have been reading quite a bit about different converters and charge rates, specifically some claims that PD's seem to drop off earlier than other brands. That is not what I have noticed on my setup,...
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BF, my test example I gave is not as precise as the Peukert adjustment would provide, but would be close enough for me to get a solid feel for the health of the batteries after all this time.
I sure hope I haven't boiled water out of my AGMs! If I haven't, maybe that helps to explain their long life. Their recommended float voltage is 13.5V to 13.8V and that's all they've had on them for ~95% of their life. The lower recommended float voltage of wets explains why it's so easy to boil them in storage ... especially with the stock 13.8V converters in a lot of RVs. Early on, I elected to switch to AGM batteries instead of replacing the converter and limping along with (new) wets and their maintenance. It would have been about the same $$$ to go with a new charger and new wets -> or stay with the converter and go with AGMs. As it was I lucked out after making the AGM decision - the dealer gave me new AGMs for around $48 each under warranty. The warranty only covered replacing with wets.
I sure hope I haven't boiled water out of my AGMs! If I haven't, maybe that helps to explain their long life. Their recommended float voltage is 13.5V to 13.8V and that's all they've had on them for ~95% of their life. The lower recommended float voltage of wets explains why it's so easy to boil them in storage ... especially with the stock 13.8V converters in a lot of RVs. Early on, I elected to switch to AGM batteries instead of replacing the converter and limping along with (new) wets and their maintenance. It would have been about the same $$$ to go with a new charger and new wets -> or stay with the converter and go with AGMs. As it was I lucked out after making the AGM decision - the dealer gave me new AGMs for around $48 each under warranty. The warranty only covered replacing with wets.
