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Post by Deleted on Sept 15, 2017 14:52:48 GMT
Could a grown up please answer a simple query.
My boat has one starter and five 110amp leisure batteries charged from two alternators, a 55 amp, and a 70amp. The boat is entirely 12 volt power (no inverter).
The replacement engine I am considering, has two alternators, being 45 amp for the starter, and 175amp for the service batteries.
Does the larger alternator mean the batteries will be charged more quickly, that is reaching charged after a shorter time with the engine running?
Rog
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Post by Deleted on Sept 15, 2017 15:04:43 GMT
The big alternator will bang in big amps for a short period, charging times are not halved though.
What it will do is allow you to run a very big inverter off your 550ah bank without making the alternator cough too much.
We have a 1000w inverter and one 55amp alternator, it knows when the kettle or toaster is on!
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Post by Deleted on Sept 15, 2017 15:07:50 GMT
Thanks for that.
I do not have an inverter.
What, if any, are the advantages of the big alternator for me.
Rog
(Big match tonight)
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Post by Deleted on Sept 15, 2017 15:55:01 GMT
Thanks for that. I do not have an inverter. What, if any, are the advantages of the big alternator for me. Rog (Big match tonight) A better chance of winning alternator top trumps?  Yes, could be a defining moment in the season (odd to say that 3rd game in!) |
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Post by peterboat on Sept 15, 2017 16:10:17 GMT
Unless you decide to fit an inverter the 175 amp alternator has no advantage for you at all. So Rog you could fit an inverter and enjoy such things as an electric kettle toaster hair drier etc etc hope Mrs Rog doesnt see these ramblings
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Post by Jim on Sept 15, 2017 17:25:07 GMT
Unless you decide to fit an inverter the 175 amp alternator has no advantage for you at all. So Rog you could fit an inverter and enjoy such things as an electric kettle toaster hair drier etc etc hope Mrs Rog doesnt see these ramblings And you would be paying, using fuel to generate electricity you don't need. |
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Post by Telemachus on Sept 15, 2017 20:21:28 GMT
We have a 175A alternator. To fully charge a battery intrinsically takes a long time, much of which is spent at low charge currents because that's all the batteries will take. Therefore a large alternator doesn't make a huge difference to overall charge time. Where it will make quite a difference in intermediate charges. Going from say 50% SoC to 80% SoC will be faster. When I left Jeff in Hungerford for 5 days he only had to run the engine about an hour a day to get it back to high 80s% despite the electric fridge, recording HD satellite box/telly etc.
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Post by Deleted on Sept 15, 2017 20:26:44 GMT
We have a 175A alternator. To fully charge a battery intrinsically takes a long time, much of which is spent at low charge currents because that's all the batteries will take. Therefore a large alternator doesn't make a huge difference to overall charge time. Where it will make quite a difference in intermediate charges. Going from say 50% SoC to 80% SoC will be faster. When I left Jeff in Hungerford for 5 days he only had to run the engine about an hour a day to get it back to high 80s% despite the electric fridge, recording HD satellite box/telly etc. Recording HD satellite box/telly???!!! The coffee machine and fancy lighting is one thing, but a statalite dish and a box to record the shite broadcast morning noon and night?? A good book and a look out the window uses no electricity and is far more satisfying. |
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Post by Deleted on Sept 15, 2017 20:59:05 GMT
We have a 175A alternator. To fully charge a battery intrinsically takes a long time, much of which is spent at low charge currents because that's all the batteries will take. Therefore a large alternator doesn't make a huge difference to overall charge time. Where it will make quite a difference in intermediate charges. Going from say 50% SoC to 80% SoC will be faster. When I left Jeff in Hungerford for 5 days he only had to run the engine about an hour a day to get it back to high 80s% despite the electric fridge, recording HD satellite box/telly etc. Logic would suggest that as we manage very well with our present alternators, the situation shouldn't be worse with a 175 amp alternator. Please tell me we don't have to get HD satellite tv. Rog |
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Post by Deleted on Sept 15, 2017 21:05:20 GMT
Piss taking aside, a >1kw inverter and a big alternator is handy for boosting the hot water via immersion heater while the engine is running. Our setup copes, just - the alternator is having its arse kicked and the revs need to be up. Having a decent amount of electric on tap doesn't mean you have to join the dishwasher, microwave, washing machine and satellite TV brigade |
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