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These two components are not well matched.
The charger is a shunt type charger. The way this works is the charger absorbs excess panel power once the battery has reached full charge and dissipates it as heat.
That is a fine, simple technique that works OK if the battery voltage and the panel voltage are well matched.
In your case as I understand it, you have a 12V battery and a 60V panel.
So the panel and the battery have very different voltages.
If you look at the panel spec you see
Vopen circuit of 90V (no current flowing)
I short circuit of 1.2A (output terminals shorted)
and suggested operating point of 60V and 0.9A
Notice please that the panel puts out 0.9A at 60V and that current only increases to 1.2A into a dead short.
The panel is best thought of as a light dependent current source.
Your 12V battery is only going to charge at about 1.2A.
Well so what?
1.2A and 12V is 14W.
Net result is you will pay for a 60W panel and only obtain 14W of charge power, not so good.
Better would be to series two batteries to 24V and you will get about 30W of charge power into the battery.
Better yet would be to go for a panel with a lower output voltage of about 16V for your battery and the match will be darn good.
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