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Old 30-06-2018, 16:34   #16
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Re: Trojan T-105 vs. Lifeline

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The 6 volt golf cart batteries are the best bang for the buck but there are valid reasons to have AGM or lithium. Depends on priorities, climate, charge abilities, etc.
It comes down to how many times you cycle your batteries a year. 100 cycles/year, FLA are by far the cheapest, 1+ cycle per day, something different.
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Old 30-06-2018, 16:40   #17
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Re: Trojan T-105 vs. Lifeline

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And will there be any significant difference for the last 20 % up to 100 % SOC? The last question is important as many cruisers use solar for top charging.
For your 880AH bank set at 14.9v, how much solar is ideal for the 20% top-up during an average good sunny day ?
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Old 30-06-2018, 21:10   #18
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Re: Trojan T-105 vs. Lifeline

So many variables.

That big a bank 1000W is needed for solar-only.

Regular genny runs in the morning can get away with maybe 4-600W.

At the equator always sunny, maybe 30% less but as always more is better.

LFP no need for solar at all, few hours of genny per week is plenty.
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Old 08-07-2018, 07:46   #19
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Re: Trojan T-105 vs. Lifeline

Have 450W solar. It is more or less impossible to reach 100% SOC as fridge/freezer is running during the day. There is not enough left over to do the last 20% charge. I do not really want to increase solar as it gets cluttered.
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Old 08-07-2018, 18:11   #20
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Re: Trojan T-105 vs. Lifeline

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Have 450W solar. It is more or less impossible to reach 100% SOC as fridge/freezer is running during the day. There is not enough left over to do the last 20% charge. I do not really want to increase solar as it gets cluttered.
Thanks. I understand. More would be good but....
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Old 09-07-2018, 15:20   #21
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Re: Trojan T-105 vs. Lifeline

That must be a big freezer, or far from the equator in winter.

An early-AM genny run with a higher-CAR bank would help, but I'd first look at improving the freezer's efficiency.
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Old 09-07-2018, 15:51   #22
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Re: Trojan T-105 vs. Lifeline

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That must be a big freezer, or far from the equator in winter.

An early-AM genny run with a higher-CAR bank would help, but I'd first look at improving the freezer's efficiency.

Better/more insulation would be big advantage. Unfortunately not easy to accomplish.

My energy budget is about 10A/h when on anchor. Solar panels are installed horizontal and will have some shadows, which means morning and evening sun is pretty inefficient.
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Old 09-07-2018, 17:00   #23
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Re: Trojan T-105 vs. Lifeline

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Have 450W solar. It is more or less impossible to reach 100% SOC as fridge/freezer is running during the day. There is not enough left over to do the last 20% charge. I do not really want to increase solar as it gets cluttered.


That is the textbook case for a little Honda. Fill it half full of gas in the morning and let it run until it quits
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Old 09-07-2018, 19:44   #24
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Re: Trojan T-105 vs. Lifeline

With a quality charger putting as many amps as possible into the bank

hence higher CAR being an advantage.

And ideally the genny run is complete just as the SC starts putting out decent amps.

PS units on that budget would be 10 **AH** per hour, or 240AH per day. Which I think would actually be more than those panels could put into a lead bank per day?
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