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Post by Mypleasure on Aug 11, 2020 11:50:41 GMT -5
Me too! What 120VAC devices do you need to run over night needing a inverter? Cant believe HVAC unit(s) will run on a inverter? Our fridge/freezer is dual voltage AC/DC so when away from dock and off shore power it will run on group eight D AGM house battery(PS: Everytime I enter the number 8 and D it shows up in post a a smiley?) , only a few amps on DC. Audio system take the most current but not on when going to bed  Also, What gen set model/rating/engine RPM do you have (1800 or 3600 RPM)? Also wonder why my previous post when you reply showed up in red font? My Ice maker up top is 120v and occasionally I have a guest that uses a cpap machine. I changed out my  and went to four AGM 200 ah batteries. My gen set is below picture along with the other stuff     |
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Post by gofast24 on Aug 12, 2020 10:39:01 GMT -5
Kohler, ugh? How has it been behaving? 4X AGM batteries great idea, vs the $2000 LI-Po batteries? Friend has a CPAP with rechargeable batteries, believe it will run 10 hours with full charge.
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Post by lg260ss on Aug 12, 2020 15:13:46 GMT -5
500 lbs of AGM batteries that only deliver, if you are lucky, 50% of their capacity. No thanks
I know $2k for LiFePO4 batteries is a lot, but it will probably be cheaper in the long run with their longevity and a 10 year full replacement warranty. And the performance difference is very noticeable immediately. Everything runs better and faster.
gofast, do you have a battery monitor or just a voltage gauge? I would be curious to know exactly how many amp hours you a squeezing out of 5 year old AGM's? I couldn't get more than 40 amp hours out of 2 100 amp hour batteries before the voltage dropped significantly.
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Post by gofast24 on Aug 15, 2020 10:24:15 GMT -5
Just a very accurate OLED Blue Seas voltmeter (+/- 0.5% accuracy)at helm. Trick is to not discharge the 8 D AGM below 12.4 VDC .The DC fridge doesn't take more than a couple amps, running about 10 minutes / hour , high power audio system is the big user of amp-hrs! The fresh water pump and vacu flush toilets only run once every 3-4 hours mostly for folks/guests that need to do a #2. From data I have from battery mfg. = 12.8 VDC or higher, 100% charge, 12.6 VDC, 75% charge, 12.30 VDC, 50% of full charge. So, when on the hook and below 12.4 VDC we either turn down or shut of audio system (adult sons dont like that) or start the great/quiet/no vibration/1800 RPM 7.0 kW 3 cyl. Westerbeke for a hour or 2. It brings up the house battery to about 12.7/12.8 VDC as Charles house charger sends 40 amps to it.
PS the ($460 AGM from NAPA on sale) 8 D AGM only weighs 122 lbs. Two strong sons no big deal to exchange it again, especially after it has performed great over 4- 5 years. If you happy with your LiFePO4 battery's Hope you get your moneys worth from them. Let us know in a few years how they are doing. Stay safe!
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Post by gofast24 on Aug 15, 2020 10:38:43 GMT -5
Just a very accurate OLED Blue Seas voltmeter (+/- 0.5% accuracy)at helm. Trick is to not discharge the 8 D AGM below 12.4 VDC .The DC fridge doesn't take more than a couple amps, running about 10 minutes / hour , high power audio system is the big user of amp-hrs! The fresh water pump and vacu flush toilets only run once every 3-4 hours mostly for folks/guests that need to do a #2. From data I have from battery mfg. = 12.8 VDC or higher, 100% charge, 12.6 VDC, 75% charge, 12.30 VDC, 50% of full charge. So, when on the hook and below 12.4 VDC we either turn down or shut of audio system (adult sons dont like that) or start the great/quiet/no vibration/1800 RPM 7.0 kW 3 cyl. Westerbeke for a hour or 2. It brings up the house battery to about 12.7/12.8 VDC as Charles house charger sends 40 amps to it. PS the ($460 AGM from NAPA on sale) 8 D AGM only weighs 122 lbs. Two strong sons no big deal to exchange it again, especially after it has performed great over 4- 5 years. If you happy with your LiFePO4 battery's Hope you get your moneys worth from them. Let us know in a few years how they are doing. Stay safe! Just curious = How do you know they are only delivering 50% of their capacity? What are u running on house battery(s). How old are they and Flooded or AGM's? ,4X 4D's, or what. How do you get 500 lbs. of batteries, our single group 8 D AGM weighs 120 lbs. or so? |
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Post by lg260ss on Aug 17, 2020 14:12:22 GMT -5
Just a very accurate OLED Blue Seas voltmeter (+/- 0.5% accuracy)at helm. Trick is to not discharge the 8 D AGM below 12.4 VDC .The DC fridge doesn't take more than a couple amps, running about 10 minutes / hour , high power audio system is the big user of amp-hrs! The fresh water pump and vacu flush toilets only run once every 3-4 hours mostly for folks/guests that need to do a #2. From data I have from battery mfg. = 12.8 VDC or higher, 100% charge, 12.6 VDC, 75% charge, 12.30 VDC, 50% of full charge. So, when on the hook and below 12.4 VDC we either turn down or shut of audio system (adult sons dont like that) or start the great/quiet/no vibration/1800 RPM 7.0 kW 3 cyl. Westerbeke for a hour or 2. It brings up the house battery to about 12.7/12.8 VDC as Charles house charger sends 40 amps to it. PS the ($460 AGM from NAPA on sale) 8 D AGM only weighs 122 lbs. Two strong sons no big deal to exchange it again, especially after it has performed great over 4- 5 years. If you happy with your LiFePO4 battery's Hope you get your moneys worth from them. Let us know in a few years how they are doing. Stay safe! Just curious = How do you know they are only delivering 50% of their capacity? What are u running on house battery(s). How old are they and Flooded or AGM's? ,4X 4D's, or what. How do you get 500 lbs. of batteries, our single group 8 D AGM weighs 120 lbs. or so? How do I know? I use one of these.
Very easy to install and will give you real time info via Bluetooth to your phone. The only other thing you need to make it work properly is an external shunt. I use a 500A/ 75mV shunt.
So with 200 Amp hours of supposed capacity from my AGM's, I could only get 50-60 amp hours before needing a charge. With the LiFePO4 batteries, I used 140 amp hours out of my 200 amp hours and I was still at 12.8V
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Post by gofast24 on Aug 18, 2020 10:54:22 GMT -5
OK, LiFePO batteries maintain almost constant voltage thru 80% of there discharge cycle? What do you mean "before needing a charge"? Voltage at what when determining a charge is needed? I think you AGM's were on their way out and most likely over discharged over the time you had them? Dont think I am going to win this one, just our 8 D AGM is doing great after 5 years. Stay safe!!
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Post by lg260ss on Aug 18, 2020 11:03:41 GMT -5
With the AGM's I would go to bed with 100% charge and wake up at 10-11 volts. batteries were 1 year old. Throwing more AGM's at the problem wasn't what I was looking for and I can only fit so many batteries in my engine room.
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Post by tc33obx on Aug 18, 2020 11:51:55 GMT -5
Interestingly Jimmy Buffets new boat, a collaboration between Merrit Yachts and Freeman Cat, does not have a gene. He runs all day on his Lithium Ion Batteries and inverters. Towards the bottom of the article. about 80% in, they cover the setup with the LiOn Batteries. Power and Motoryacht Jimmy Buffet Build Article. |
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Post by gofast24 on Aug 19, 2020 10:28:03 GMT -5
With the AGM's I would go to bed with 100% charge and wake up at 10-11 volts. batteries were 1 year old. Throwing more AGM's at the problem wasn't what I was looking for and I can only fit so many batteries in my engine room. Still wondering what DC loads you have overnight? Has to be excessive DC loads or shot (over discharged) AGM batteries? Whatever, hope your LiFePO4 batterys solve your problem |
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Post by gofast24 on Aug 19, 2020 10:37:13 GMT -5
Still wondering what DC loads you have overnight? Has to be excessive DC loads or shot (over discharged/recharged) AGM batteries? Whatever, hope your LiFePO4 battery's solve your problem |
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Post by lg260ss on Aug 19, 2020 16:23:13 GMT -5
Still wondering what DC loads you have overnight? Has to be excessive DC loads or shot (over discharged/recharged) AGM batteries? Whatever, hope your LiFePO4 battery's solve your problem 2 refrigerators, 12 volt fan on continuous. And then various quick loads like toilet flushing, water pump, sump pump |
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Post by tc33obx on Aug 20, 2020 12:09:22 GMT -5
Two refrigerators are a big draw on the batteries overnight, along with the water pump and vacuflushes. My 4460 was fine with one 8-D battery overnight but if I didn't run the generator or the boat, or get to shore power it wouldn't last more than 24 hours before we'd start seeing lights dimming and such.
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Post by omarf4 on Aug 20, 2020 23:49:21 GMT -5
Lg, post pics of the battery bank in your engine compartment...also, what setting is your charger set to to charge the LiFePO4‘s and your engine batteries?
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Post by gofast24 on Aug 21, 2020 9:57:58 GMT -5
Still wondering what DC loads you have overnight? Has to be excessive DC loads or shot (over discharged/recharged) AGM batteries? Whatever, hope your LiFePO4 battery's solve your problem 2 refrigerators, 12 volt fan on continuous. And then various quick loads like toilet flushing, water pump, sump pump What 12 VDC fan? The HVAC units on continuous fan or a small 12VDC/ 120 VAC fan? Again the accurate Blue Seas OLED Voltmeter I installed on our helm is what we watch for, when is shows the 1X 5 year old 8 D AGM house battery below 12.4 VDC, time to shut off unnecessary loads or start gen set. . To be honest, we only overnight one night when on the hook (kinda Small lake compared to ocean 2/3/4 overnights) so no long time running any DC loads on house battery. i can imagine if your on the hook for 2/3/4 days you will deplete your house batteries? I am thinking the big difference in our house battery life/usage is how many nights/times we are on strictly house battery? |
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Also, What gen set model/rating/engine RPM do you have (1800 or 3600 RPM)? Also wonder why my previous post when you reply showed up in red font? 
and went to four AGM 200 ah batteries. My gen set is below picture along with the other stuff
