What VSR (Voltage Sensitive Relay) do I need to install on my yacht?

[coopec43]

I am currently trying to work out the charging system for the yacht I am building

The system is 24V

Starting batteries 2 X 700 CCA?

House Bank 2 X 135 AH (To be doubled)

Auxiliary engine alternator 24V 60A

Suitcase inverter generator 3000W 125A

Inverter 3000/6000W 24V

I did have a 1/2/both switch for the solar power output but I plan to only charge the house batteries (for the sake of simplicity)

Is this the sort of VSR I need? Would very much appreciate your help






• Warranty: 1 year from the purchase date.
• Bulkbuy and Wholesale(including sell products under your own brands and packages) are welcome, please contact us.
• Suits large road vehicles and marine such as large boats
• Automatically connects and disconnects an
appliance or circuit at the preset input voltage.
•100amp current rating satisfies normal appliance usage and designed for high amp draw appliances that need a high constant current rating to prevent faults.
• Material: ABS, Brass and copper (terminal studs inside of the VSR are made from copper, not stainless steel)
• Includes: 1x 24 Volt 100 Amp Voltage Sensitive Relay, 1x User manual, 4 stainless steel screws, and negative terminal ring
• Package: box
• Ideal for dual battery systems or to switch high current appliances.
• Features surge protection, L.E.D indicator&Voltmeter
• Silver tin tipped contacts for durability and efficiency
• Water proof leve(reputable manufacturer lab test):IP65 suits all kinds of tough situations
Same manufacturing method and sealant technique used for our latest manual overriding VSR with Voltmeter (Part number: NSVSR12V)
• Certification:CE
• Specifications:
Voltage: 24V DC
Max Working Current: 90-120Amp Continuous, 160Amp Peak
Current Draw: Charging: 150mA, Standby: 1mA
Cut-in Voltage: 27.4V DC ^
Cut-out Voltage: 25.60V DC
Cut-out delay: 3-5 seconds
One way sensitive *
Does not work with vehicle has smart alternator
• Waterproof: yes(could achieve IP65 - tested by our trustful and reputable supplier )


* Please note that this VSR is one way sensitive only(there are some VSRs on the market are dual way sensitive). So this means, this VSR will only work to transfer the electricity from one battery to the other battery. let us treat start battery as battery A, auxiliary battery as battery B to make this easier and clear - our VSR only works to transfer the electricity from battery A to battery B with the precondition that positive terminal of battery A is connected with the VSR start battery post and the negative terminal of battery A or vehicle chassis is connected with the VSR negative wire.


^ The manufacture use extra 0.3V(27.6V) as the bench mark to test to cover the electricity loss of the wiring. Especially for thick and heavy duty wires, so we should also consider this part in operation voltage.

[PaulCrawhorn]

This one

https://www.bluesea.com/products/762..._-_24V_DC_500A

Buy once, cry once

will never fail, bulletproof

full featured, read the docs

[coopec43]

Originally Posted by PaulCrawhorn

This one

https://www.bluesea.com/products/762..._-_24V_DC_500A

Buy once, cry once

will never fail, bulletproof

full featured, read the docs

Paul

Thanks, but now I am confused

Why on earth would I need 500A? at a cost of $475.

MY suitcase inverter generator is 3000W 24V so surely I only need 125A? Where am I going wrong?

[more]

you are from australia

https://www.solar4rvs.com.au/victron...y-combiner-kit

or bigger

https://www.solar4rvs.com.au/victron...gent-battery-c

[more]

https://www.youtube.com/watch?v=is_nXRNWlHI

[PaulCrawhorn]

You are building a yacht.

I did not say "you need it".

You asked I answered, feel free to ignore the reco

[coopec43]

I asked

"Is this the sort of VSR I need?"


And you answered

"This one"
https://www.bluesea.com/products/762..._-_24V_DC_500A

Which confuses me because as far as I am concerned a 500A VSR would be like using a sledge hammer to crack nuts.

[d design]

Use a DVSR by BEP Marine duel sensing. 125A. cut in 13.7 cut out 12.8 from memory.

The Blue Seas ML-ACR can be used as a parallel switch also and is a more reliable unit but not necessary in all cases.

[coopec43]

Originally Posted by d design

Use a DVSR by BEP Marine duel sensing. 125A. cut in 13.7 cut out 12.8 from memory.

The Blue Seas ML-ACR can be used as a parallel switch also and is a more reliable unit but not necessary in all cases.

I think we are getting somewhere but my electrical system is 24V (not 12V)

[moseriw]

Hint! Do not mix battery types! Skip these units! I think the best way ist to charge the house batteries and to use i.E. Victron Orion 24/24/17 as charger for other types of batteries. It will provide proper charging curves für the type.

Usually one uses AGM or FLA for the Starter Battery, AGM for the bow battery and AGM, FLA(Trojan) or LiFePo4 for the house bank. (And the confusion on charging is perfect)

As I said B2B chargers are the best work around.

My Setup (12V):
Alternator 160A
200 A Alternator to Battery charger
90-280VAC to 14-15VDC 160A Power supply (serves A2B)
Generator 7,5 kW
Solarpanels 2x2 serialized each
2 Solarchargers for each of 2
and the orions for bow and starter

A2B to house and starter, solar to house, B2B to starter and bow.

Hint: check your battery banks, If you have 2 Batteries the minus goes to one and the plus to the other. If you have 12+12 for 24 then you have + to - and + to plus and grep the load like i said before.

https://battlebornbatteries.com/batt...s-vs-parallel/

Good luck and try to find an excellent electrician (good is not enogh!!!)

[coopec43]

Originally Posted by moseriw

Hint! Do not mix battery types! Skip these units! I think the best way ist to charge the house batteries and to use i.E. Victron Orion 24/24/17 as charger for other types of batteries. It will provide proper charging curves für the type.

Usually one uses AGM or FLA for the Starter Battery, AGM for the bow battery and AGM, FLA(Trojan) or LiFePo4 for the house bank. (And the confusion on charging is perfect)

As I said B2B chargers are the best work around.

My Setup (12V):
Alternator 160A
200 A Alternator to Battery charger
90-280VAC to 14-15VDC 160A Power supply (serves A2B)
Generator 7,5 kW
Solarpanels 2x2 serialized each
2 Solarchargers for each of 2
and the orions for bow and starter

A2B to house and starter, solar to house, B2B to starter and bow.

Hint: check your battery banks, If you have 2 Batteries the minus goes to one and the plus to the other. If you have 12+12 for 24 then you have + to - and + to plus and grep the load like i said before.

https://battlebornbatteries.com/batt...s-vs-parallel/

Good luck and try to find an excellent electrician (good is not enogh!!!)

Thank you for that helpful advice.

I've been doing a lot of reading and have come across DC-DC Chargers. Obviously I need to do more research on them AND I will most certainly be taking your advice to get a competent Marine Electrician to do the high amperage set-up and gas-fitting. (I will be transporting the yacht to a marina where they have all the trades)

I'm all for keeping the wiring simple and would have no problem using very heavy jumper leads to start the motor off the House Bank.

I've set my battery bank (and starting bank) up like this.

NOTE "o - and + to plus and grep the load like i said before."

I've never come across the word "grep" before. Is that a typo?


"Two 12 volt 100 amp hour batteries wired in series result in a 24 volt 100 amp hour battery bank"

[more]

Originally Posted by moseriw

Hint! Do not mix battery types! Skip these units! I think the best way ist to charge the house batteries
Good luck and try to find an excellent electrician (good is not enogh!!!)

o my good. how voltage and current know and care this guy mixing battery type (lead lithium lifepo4 3.2v not polymer 4v)
you typing on net with the huge mixing power source. All EU powerplant solar,nuclear,gas,diesel,coal,wind and other make AC (tricky because you can stop flow in any direction,DC current is easy stop to flow back current .

[moseriw]

Sorry about grep (Think grab might fit) I'am not a native speaker, my location is Austria with native tongue german. Your boat is a jewel! I think your house batteries amperage is a bit to low.

On 12V I am expecting a load of max. 15A per hour = 360A/day /2 for 24V = 180A.
AP 6A
Radar 3A
Navigation and AIS + Computers 4A
Fridge 2A
-------------
15A at 12V

On your boat, like mine, you may be able to mount 420 Wp panels. They will give you 19A peak and maybe 12A average. With 12x10 hrs if the sun is ok I am earning 120 Ah which is way short.
remeber, I am talking about my 12V setup.

And I have no idea what more is talking about. Maybe I am lacking knowlege of the used language. Marine Service Provider, as I said, good is not enough I am fooling around with it since 2014 and it looks like I got it now. (And not enough help from so called professionals)

using very heavy jumper leads: I use 95 mm² on almost all backbone leads but für 24V you should be fine with 50 mm² but the heavier the better. Check out the voltage drop calculators. < 4% is OK.

Next:
charging. You should reach a current of 20-25% (Not More!!) of the battery capacity enabling you to fully charge within 2 hrs on the genset. Time enough for the washing machine, the watermaker, cooking

[coopec43]

Originally Posted by moseriw

Hint! Do not mix battery types! Skip these units! I think the best way ist to charge the house batteries and to use i.E. Victron Orion 24/24/17 as charger for other types of batteries. It will provide proper charging curves für the type.

Good luck and try to find an excellent electrician (good is not enogh!!!)

Thanks for that advice! I have read it somewhere before and here it is again.

Can I mix deep cycle battery brands?

If you mix brands even of the same labelled voltage – you can experience problems. Due to different manufacturing processes, the exact voltages of batteries from different producers can vary slightly.13 Sept 2019

https://batteryguy.com/kb/knowledge-...s-in-parallel/

[moseriw]

I'm all for keeping the wiring simple and would have no problem using very heavy jumper leads to start the motor off the House Bank


The correct setting is some sort of emergency switch to connect the house bank to the starter bank.
Maybe a sound alarm is a good idea. I forgot to close the switch and my starter battery died. As a result the house bank was battered too. No damage but I think it was close to it.