rb450 power problem

We are using this power supply
http://www.stontronics.co.uk/.../e50c0df9-8ba9-4602-9839-bd2e6ec710c7.pdf
with two 12v 7.5 amp battery.

when light goes off mikrotik turns off and when power comes on mikrotik is still off, we need to unplug jack wait for 5 minuts and plug it back after that its works again. we have tested also to plug it in power jack but not luck.

we have tested same battery with rb433 and its works fine, we have problem only with rb450s

can anyone help?


thank you