question

Hi. If your 24V alternator can actually produce 80A, then it's already oversized for your house bank. If you could measure the A you'd probably find it never gets there because the batts can't accept that much. They may for a few minutes, but can't sustain it. Once the ultimate charge V is achieved the alt will back off, and adding more charge capacity would be futile.

The Orion could do what you want, but it only has a single V adjustment (like the alternator). Just thinking aloud now, but perhaps you could set the Orion to a higher Absorb V, and switch it on/off to suit.

A BMV battery monitor would be useful in your situation, regardless of what you end up doing..

Many thanks

I have a BMV battery monitor, indeed very useful.

Max amps I get is about 40 but I think that's more to do with the revs / alternator than charge acceptance of the batteries.

Thank you for your thoughts.

Look you may not want to hear this, but instead of investing in more alternator charging or a DC to Dc converter, look at 1 x 180A/H (2.5kw) Lithium Phosphate battery bank, this will replace the 360 A/H of LA you have in total but can only use max 50% or 180 A/H of the LA and then the last 20% takes for ever to charge.

So if the current bank is a few years old it maybe a good option to look at, you wont look back, plus the LP will last and last way way way past the time of the LA banks.

ALSO with LP dont go overboard with extra capacity, put in 180 A/H or 2.5 Kw and see how it goes, you can always add batteries to a existing LP bank even years after (as long as they are the same working voltages that is )