T-Pain Is On A Boat: January 2024

Tuesday, January 30, 2024

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

On Jan 29, 2024, at 3:27 PM, Stew <stewart.reed@free.fr> wrote:

Makes total sense. Really helpful post, thanks. I currently run my 12V off the 48V bank but your solution ring-fences the 48V for motor energy. I think I'll do the same.
Stewart
+33 6 87 96 66 80

On 29 Jan 2024, at 17:43, Fabien Letourneau <fabien.letourneau@gmail.com> wrote:

I have a 48V battery bank and a 12V house. Been running this setup for 4 years now and no issues.
I use an MPPT (Victron SmartSolar 100/20). Connect your 48V battery to the MPPT PV input. The MPPT sees your 48V or 52V bank as solar and it outputs proper charging voltage for your battery type. You can set charge voltages, and all the charging parameters. MPPT's are designed to do exactly that, so much better than a converter. Chances are you already have a Victron unit for your solar arrays, if so you can use the same Victron Connect app to read the house battery unit as well.

Additional tip. I charge the 48V bank at the dock (shore power) as well as solar when cruising (using another MPPT). To prevent our 12V loads discharging our 48V bank when at sea or dock and end up without a motor, we use a switch to the victron unit remote connector. This is not very well documented or understood, but the VE. Direct connector can be used to turn the unit on or off without requiring the VE.Direct cable or unit. Connect Pin 2 to GND will switch the MPPT charger off. Switch that connection to open and the unit starts charging.

Keep in mind that the 48V whether connected through a DC-DC or MPPT, the 12V battery is being maintained all the time from your 48V hence draining your 48V bank, unless you have a 12V disconnect or a charger disconnect.

In my case, at the dock, a relay opens when we have shore power, and allows the MPPT to charge the house battery. When shore power is removed (when at sea), the relay closes and the MPPT for our 2V house is off. We use minimal 12v loads and monitor the house battery level. I also installed a bypass switch that I can manually through open if needed (after confirming sufficient reserve in the 48V bank). So at sea, if the 12V is starting to get low, we flip the switch and the MPPT starts charging our house battery from our 48V. Very nice and peace of mind, no worries about the house loads draining our 48V bank while sleeping, anchor light staying on, etc..

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Take a look at VICTRON ORION DC-DC converter : https://www.victronenergy.com/dc-dc-converters/orion-tr-dc-dc-converters-isolated
Thierry

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Monday, January 29, 2024

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Makes total sense. Really helpful post, thanks. I currently run my 12V off the 48V bank but your solution ring-fences the 48V for motor energy. I think I'll do the same.

Stewart

+33 6 87 96 66 80

On 29 Jan 2024, at 17:43, Fabien Letourneau <fabien.letourneau@gmail.com> wrote:

I have a 48V battery bank and a 12V house. Been running this setup for 4 years now and no issues.
I use an MPPT (Victron SmartSolar 100/20). Connect your 48V battery to the MPPT PV input. The MPPT sees your 48V or 52V bank as solar and it outputs proper charging voltage for your battery type. You can set charge voltages, and all the charging parameters. MPPT's are designed to do exactly that, so much better than a converter. Chances are you already have a Victron unit for your solar arrays, if so you can use the same Victron Connect app to read the house battery unit as well.

Additional tip. I charge the 48V bank at the dock (shore power) as well as solar when cruising (using another MPPT). To prevent our 12V loads discharging our 48V bank when at sea or dock and end up without a motor, we use a switch to the victron unit remote connector. This is not very well documented or understood, but the VE. Direct connector can be used to turn the unit on or off without requiring the VE.Direct cable or unit. Connect Pin 2 to GND will switch the MPPT charger off. Switch that connection to open and the unit starts charging.

Keep in mind that the 48V whether connected through a DC-DC or MPPT, the 12V battery is being maintained all the time from your 48V hence draining your 48V bank, unless you have a 12V disconnect or a charger disconnect.

In my case, at the dock, a relay opens when we have shore power, and allows the MPPT to charge the house battery. When shore power is removed (when at sea), the relay closes and the MPPT for our 2V house is off. We use minimal 12v loads and monitor the house battery level. I also installed a bypass switch that I can manually through open if needed (after confirming sufficient reserve in the 48V bank). So at sea, if the 12V is starting to get low, we flip the switch and the MPPT starts charging our house battery from our 48V. Very nice and peace of mind, no worries about the house loads draining our 48V bank while sleeping, anchor light staying on, etc..

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Using a power supply when there is a battery connected is not the right solution. A power supply works great on circuits without batteries delivering perfect voltage. Once a battery is added, then a charger is used.

Check with your solar controller as to maximum voltage from the solar panel. I have a dedicated 40v panel charging one of my 12v batteries. My other 12v battery is charged with a 48v/12v DC/DC charger.

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Thursday, January 25, 2024

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

I use a Victron 75/15 Smart MPPT controller to charge a 12v LiFePO4 domestic service bank. Works well for me.

On Fri, 26 Jan 2024, 02:56 , <kurtphone@gmail.com> wrote:

I use a Victron mppt smart solar controller from the 48V main bank to the 12V house bank. It's smart, switchable and has a configurable charge profile with bluetooth control and monitoring.

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Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

I agree with Kurt's suggestion: a MPPT charger will be a good option. I am using EPEver mppt chargers to keep my 12Vdc and 24Vdc battery banks charged from my 96Vdc main energy storage bank. This has been working great for close to 2 years now.

The only issue with most MPPT chargers: if you were to disconnect the 12Vdc battery and keep the 48Vdc connected, most MPPT chargers would be destroyed, as they do not have protection for this situation. I have killed one of my chargers due to that already.

Jerome

On Thu, Jan 25, 2024 at 2:56 PM <kurtphone@gmail.com> wrote:

I use a Victron mppt smart solar controller from the 48V main bank to the 12V house bank. It's smart, switchable and has a configurable charge profile with bluetooth control and monitoring.

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Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

I also use a dc-dc charger. It provides a steady 13.4 volts to the house battery, which is good and guarantees that there is always a reliable 12volt supply. What it doesn't do is provide the occasional bulk and absorption charge the battery needs from time to time. I believe there are DC-DC generators that can provide this as well

On Thu, Jan 25, 2024, 1:18 p.m. Reuben Trane via groups.io <rjtrane=me.com@groups.io> wrote:

I have a 48v battery charged from solar and a 12v AGM battery in the bow for windlass and local 12v needs. I use a DC/DC charger. Works perfectly. If interested I can get you brand and info.

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Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

I have a 48v battery charged from solar and a 12v AGM battery in the bow for windlass and local 12v needs. I use a DC/DC charger. Works perfectly. If interested I can get you brand and info.

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Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

I use a Victron mppt smart solar controller from the 48V main bank to the 12V house bank. It’s smart, switchable and has a configurable charge profile with bluetooth control and monitoring.

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Wednesday, January 24, 2024

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

I have a 48V battery bank and a 12V house. Been running this setup for 4 years now and no issues.

I use an MPPT (Victron SmartSolar 100/20). Connect your 48V battery to the MPPT PV input. The MPPT sees your 48V or 52V bank as solar and it outputs proper charging voltage for your battery type. You can set charge voltages, and all the charging parameters. MPPT's are designed to do exactly that, so much better than a converter. Chances are you already have a Victron unit for your solar arrays, if so you can use the same Victron Connect app to read the house battery unit as well.

Additional tip. I charge the 48V bank at the dock (shore power) as well as solar when cruising (using another MPPT). To prevent our 12V loads discharging our 48V bank when at sea or dock and end up without a motor, we use a switch to the victron unit remote connector. This is not very well documented or understood, but the VE. Direct connector can be used to turn the unit on or off without requiring the VE.Direct cable or unit. Connect Pin 2 to GND will switch the MPPT charger off. Switch that connection to open and the unit starts charging.

Keep in mind that the 48V whether connected through a DC-DC or MPPT, the 12V battery is being maintained all the time from your 48V hence draining your 48V bank, unless you have a 12V disconnect or a charger disconnect.

In my case, at the dock, a relay opens when we have shore power, and allows the MPPT to charge the house battery. When shore power is removed (when at sea), the relay closes and the MPPT for our 2V house is off. We use minimal 12v loads and monitor the house battery level. I also installed a bypass switch that I can manually through open if needed (after confirming sufficient reserve in the 48V bank). So at sea, if the 12V is starting to get low, we flip the switch and the MPPT starts charging our house battery from our 48V. Very nice and peace of mind, no worries about the house loads draining our 48V bank while sleeping, anchor light staying on, etc..

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Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

I had the same issue. I have a 48 to 12v converter, but they say not to use it for battery charging. So I ran a 50w solar panel for that one battery. I am researching if I can put 48v into the solar controller to charge the house battery. I hate to fry a controller just to test it. So, im thinking I'll connect the battery and the 48-12 converter to the house circuitry and since it only puts out 12v, the solar panel will top off the battery to 14 volts.

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Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

The Meanwell DDR-480C-12 looks like it will work, although it's not specifically a charger, it does have current-limited output.

https://www.meanwell-web.com/content/files/pdfs/productPdfs/MW/DDR-480/DDR-480-spec.pdf

Tops out at 14V though, which usually suffices for 4S LFP.

They can be paralleled in case 34A isn't enough.

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Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

We also installing a 48vdc propulsion bank 600ah and charging the 12vdc from the 48 pack. Recommendation from Victron was to use a MPPT solar charger feed from the 48vdc connected to the Cerbo GX for system monitoring, so we have installed a 100/50 for the LiFePO4 300ah house bank, and a second MPPT 75/15 to the 50ah AGM davit crane battery. None are operational yet, but we trust what victron have recommended.

Cheers

kel

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[electricboats] Recommendation for Charging 12v House Battery from 48v Bank

I have the battery box for my 48vdc 200ah main bank installed and am considering how best to keep my 12 vdc house battery charged. All batteries in my system are LiFePO4. I will maintain charge in the main bank with 400 W of solar and a back up generator if necessary but, as my solar array will be 48v nominal I’m trying to decide how best to keep my 12vdc house battery charged. I had been thinking of one of the Victron Orion dc-dc converters but just noticed in the literature that Victron says that these units are not for battery charging. I’d like to be able to use the main bank as a full time source for the house, but would appreciate any suggestions on what I can use to continuously feed from my main bank to my house battery.

Thanks in advance.

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Sunday, January 21, 2024

[electricboats] SV/Retreat Time Catamaran is for sale in Tampa Fl.

[Edited Message Follows]

Friends it's

time for a new owner, she is ready to go with her 18 KW motors and new batteries new bottom paint last march,
2 New Dometic reverse cycle in 2018, Max props, forward looking sonar, new console dingy with merc 20 hp electric and pull start, with 1 hr. use. new upholstery and stack pack. All led lighting, water maker, 7 anchors of various sizes, two asem spinnakers, two mains, extra props, two vhf radios and handheld. Ice maker, 2 state room one head, new commode, Garmin chart plotter and full suite of ray marine nav equipment. wired for star link, inside steering, Huge solar system, and lots more. email or texts will be answered. Will consider trads for real-estate or?

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Friday, January 19, 2024

[electricboats] SV/Retreat Time Catamaran is for sale in Tampa Fl.

Friends it's

time for a new owner, she is ready to go with her 18 KW motors and new batteries new bottom paint last march,
2 New Domestic reverse cycle in 2018, Max props, forward looking sonar, new console dingy with merc 20 hp electric and pull start, with 1 hr. use. new upholstery and stack pack. All led lighting, water maker, 7 anchors of various sizes, two asem spinnakers, two mains, extra props, two vhf radios and hand held. Ice maker, 2 state room one head, new commode, Garmin chart plotter and full suite of ray marine nav equipment. wired for star link, inside steering, Huge solar system, and lots more. email or texts will be answered. Will consider trads for real-estate or?

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Re: [electricboats] Complete electric propulsion system for sale

I'm interested.

Dennis

310.702.1166

On Fri, Jan 19, 2024 at 7:48 AM, Rob Temple via groups.io
<robtemple=embarqmail.com@groups.io> wrote:

Four years ago I swapped out my 19 hp Volvo diesel for a 10 KW Thunderstruck system in my 32' schooner which I have used for day charters since 2010. It worked out great for the past four summer seasons but I have decided to go back to diesel for more cruising range. If anyone is interested in purchasing my electric rig complete with motor, controller, charger, 2:1 reduction gear and 4 155 ah agm batteries I'll make you a very good deal just to clear out my storage shed. You can email me or text me at
252-928-7245.
Rob

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[electricboats] Complete electric propulsion system for sale

Four years ago I swapped out my 19 hp Volvo diesel for a 10 KW Thunderstruck system in my 32' schooner which I have used for day charters since 2010. It worked out great for the past four summer seasons but I have decided to go back to diesel for more cruising range. If anyone is interested in purchasing my electric rig complete with motor, controller, charger, 2:1 reduction gear and 4 155 ah agm batteries I'll make you a very good deal just to clear out my storage shed. You can email me or text me at
252-928-7245.
Rob

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T-Pain Is On A Boat

Tuesday, January 30, 2024

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Monday, January 29, 2024

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Thursday, January 25, 2024

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Wednesday, January 24, 2024

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Re: [electricboats] Recommendation for Charging 12v House Battery from 48v Bank

[electricboats] Recommendation for Charging 12v House Battery from 48v Bank

Sunday, January 21, 2024

[electricboats] SV/Retreat Time Catamaran is for sale in Tampa Fl.

Friday, January 19, 2024

[electricboats] SV/Retreat Time Catamaran is for sale in Tampa Fl.

Re: [electricboats] Complete electric propulsion system for sale

[electricboats] Complete electric propulsion system for sale

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