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House Battery + Starter Battery + 2 Battery Monitor Shunts?
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- Опубліковано 26 лют 2022
- "Hi Jeff, with a two battery setup (starter and house) in conjunction with an ACR (with on/off/combine switch), can you still use a single shunt (both battery negatives on one side of the shunt and all negative loads on the other side) for use with a single battery monitor? Or, would it be preferred for the starter and house batteries to have their own separate shunts and separate battery monitors? Thanks so much-I know you’re a busy guy." - Brian
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Love the bridge analogy... Helped a lot. Thanks Jeff!
Glad to hear it!
Thanks Jeff, appreciate what you're doing.
My pleasure!
Great video Jeff. I think I understand the concept of the choke point and the shunt, I still have my battery monitor laying somewhere... The problem I am facing is that in my 40+ years old and at least 2 previous owners, some loads where connected to negative in any place where they found ground and not to the house negative post or bar connected to it... So it will be a challenge in my boat to reposition all negatives to where they belong.. I think I will do it, but may be no too soon...
My set up is close to situation you describe. Victron wireless shunt is hooked to house battery but there is the ability to measure voltage on another battery, in this case the start battery. You don’t know the state of charge on start battery but if you know voltage you are confident it will start engine. ACR keeps start battery from discharging while at anchor. Not as good as two shunts, but knowing house battery state of charge and start battery voltage is good enuf for me. Great topic btw.
Good point, you can definitely monitor a 2nd battery voltage.... which is really useful
Hi Jeff, amazing content. I am re-doing my boats batteries. Currently has 2 duracell marine used as both house and starter with a small 10 amp charger. Cant i just put 3 IP67 victron chargers on each and then use a bluetooth to 3 7 inch tablets mounted at my main counsel to monitor my batteries. This allows me not to use a shunt and also meet the 40% of the firefly with a victron charger. Might use a 15 amp for both starter batteries.
Thanks and keep up the great content. Love the geeking put and mental torcher. I bought a new boat and the needbfor updating rhe electrical is crazy.
Great video. Audio sounds like it’s from the laptop and not the microphone tho. ☹️
Thanks for video! I have 2 48 volt battery banks that are independent. I use an A/B switch to select which one I am using. They are completely separate. Simply a redundant system on my electric motorized sailboat. I have 2 shunts and I know they need to be at the battery ("choke point"). My question is can they share a negative bus bar after the shunts? To recap: 2 battery banks, 2 shunts then...One bus bar that grounds devices. Will that work and give me accurate data at the shunts?
Thank you for the video. I'm looking into adding a battery. What is like to know is can the batteries in this situation be different sizes? Can one be deep cell and the other not?
I believe he covered this in another talk, and the short answer is all batteries have to be the same type and chemistry. As far as sizing is concerned I would make them the same amp hour size but I didn't see any comments about that.
@@vnichol thank you. I appreciate the response 👍🏼
Understand two shunts to monitor current in/out for two separate batteries. What about two shunts to monitor one battery? My existing monitor is old and I’d like to upgrade to a monitor with more features, but do not necessarily want to throw away the old shunt/monitor. Will two shunts wired at the same points interfere with each other?
i have been watching all your videos on this particular subject and I agree it is not easy to grasp the concepts and apply them to my boat. I think my big stumbling block is I do not understand how my boat was originally setup and how much add on has been done since the initial build in 2004. I know there are devices tied directly to the house battery bank that need to be removed and connected to a terminal block of some kind.
would an audit be a good starting point? What kind of professional should I look for to provide this service?
I think that's solid information and a really good question asked. So I guess the real answer to the question is it's good to have two shunts if he wants to know exactly what going on with each battery at any given time. However, this leads me to a question.let's say the switch has been flipped and both batteries are now one bank, do we need to have a shunt that is suitable to handle the power of both batteries or is the difference is in if their weird in parallel or not?
Thinks for a great video
Thanks James, it's very rare for boatowners to have a dedicated battery monitor for 2 battery banks. Nothing wrong with doing so, the cost benefit isn't worth for many boaters. That said, if you can afford it, why not?
@@PacificYachtSystems I understand so I was right in having a shunt to handle the power of two batteries when and if one would need to join the two together. Thanks 👍😃.
Hi Jeff, Currently upgrading the electrical on my sailboat (Coronado 27). I've got two Group 27, 12 vdc house batteries. I'm installing a new DC power distribution panel (Blue Sea 8068) and a Victron BMV-702 Battery Monitor. Both came with a Battery Shunt, but I'm thinking only one is necessary. Note: The Blue Sea panel has a Voltmeter and an Ammetter, which draw power from the shunt. Any guidance??? according to the installation guides, it appears that the Victron Shunt is on the negative side and the Blue Sea is on the positive side???
Is the acr from his question shown as the battery monitor in your diagram?
Maybe I missed it but I think Jeff is saying each bank needs its own shunt on the one wire between the battery and the negative bus bar. is that correct?
if you want to monitor 2 banks you would need to have 2 shunts. most people only monitor the house bank. with a volt gauge on the engine bank
I have the Victron 712 with 500a shunt. It has the ability to monitor a second battery but is this really safe to do because victron says to combine the negative of both battery's to do this? In my set my 48v bank is what drives the electric motor and then the 12v battery powers my few accessories (nav lights, fish finder, stereo). Would it really be safe to join the negative from a 48v system with a 12v system as Victron says to do to monitor the aux 12v battery?
Not sure about your specific setup requirements, but in the marine world it's quite normal for battery negatives to tied to a common negative distribution.
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