I have just installed a victron Orion in my boat with a Yamaha 225 saltwater series outboard, the charger turns on and goes straight up to 25-30amps but then turns off. it does this continuously and doesnt stay on for long enough to charge the battery
Which Orion?
What's the alternator output? Is it a 'smart' alternator?
What battery are you charging?
It's not cutting out. Just the charge rate is varying, probably due to other loads on the alternator or engine speed changing.
If the alternator really is that low power, there's a good risk of it burning out with a 30A Orion. Rule of thumb is the alternator rating should be twice the total sustained load to prevent overheating.
Take a look at this video. The solution isn't for you, but it does show the dangers.
have you double checked the wiring to batteries in and out?
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