Complicated 12v to T105 conversion

[daletournier]

Real world experience. I'm a full-time live aboard that has started both yanmars I've owned using trojan deep cycles for ten years, I haven't seen any adverse effects.
There is zero problem using deep cycle batteries to start our diesels.

[mitiempo]

Originally Posted by duckpond49

An starter battery isolated from house bank is the best setup. Starter batteries are designed to deliver a quick 200A jolt and then recover quickly. Big deep cycle batteries can deliver large surges but don't recover quickly. I left the radio on in my truck yesterday for 5 hours and my truck wouldn't start. I put a small 6 amp charger on it for 45 minutes and was running again. Try that on a 400AH house bank and it would take 24 hrs.

If the house bank is used for starting the engine there is no need for "quick recovery". If you start with 300 amps (your starter will probably use less than this) for 10 or 15 seconds you have only used one amp hour give or take. Nothing to recover really.

While one deep cycle battery has less cranking amps than a starter battery the multiple of 4 is more than sufficient for starting.

[LLCoolDave]

Just wanted to say thank you to everyone for the input.

I contacted trojan and as most people said, customer support stated the batteries would not be damaged by using the bank as a starting solution.

I'll have questions going forward. Thanks.