Hi,

We wish to find the correct battery bank to power:

1) a 24V 20hp (14.96 KW) bow thruster (Maxpower CT225) on a boat, with the following requirements:

- Designed to run at 22V

- Max amperage 690 A

2) A 24V 1700 W windlass (90 Amp)

Question 1: is the indicated CCA of Victron batteries according to the DIN norm?

Question 2: How can I translate the DIN norm (voltage must be at least 9.0V after 30 seconds at -18o C) to the conditions required mainly by the bow thruster (11V for 10-20 seconds at 5o C). Are there any tables/diagrams available?

Question 3: Is a bank of 4x 90 Ah AGM deep-cycle Victron batteries (CCA of 400A each) making a total of a 180Ah 24V with a CCA of 800 safe? If not, what would be advisable?

Thank you for your attention.