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post #11 of 12 Old 06-17-2019
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Re: Add a battery?

Quote:
Originally Posted by Gregrosine View Post
We have two batteries on our 1999 352 Beneteau; a 70 amp group 24, and a 135 amp 4D. I also have a 12v/55 amp alternator and a 20 amp battery charger. I only have the analog battery monitor that is original to the boat. What alterations do I have to make to add an additional house battery?
An example, and we have similar sized boats.
4-6volts would fit in the same space and give you 440 ah. Larger lead plates usually mean more deep cycles.

I would get a battery monitor , easy to install not expensive .
Here’s one but there are others

https://www.victronenergy.com/battery-monitors/bmv-700


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post #12 of 12 Old 06-18-2019
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Re: Add a battery?

Quote:
Originally Posted by Gregrosine View Post
We have two batteries on our 1999 352 Beneteau; a 70 amp group 24, and a 135 amp 4D. I also have a 12v/55 amp alternator and a 20 amp battery charger. I only have the analog battery monitor that is original to the boat. What alterations do I have to make to add an additional house battery?
The House battery is the one not used to crank an engine.

Are your two current batteries connected in parallel together at all times now to form a single bank?

Or are they currently separate, one Starter one House?

Usually the device to accomplish that is a VSR / ACR.

What are your current sources of charge inputs when out on the water? What are your usage patterns, how many days / weeks away from shore power?

If away extensively, what sort of loads, can you create an energy budget? You'd really want a true deep cycling bank.

Do you have a strong need for sealed (AGM or GEL), or is the (better vallue) option FLA acceptable for you?

A plain volt meter is not what we call a Battery Monitor these days, the current Victron model is BMV-712, but there are dozens of such coulomb-counting types available.

Another type is SmartGauge and SG-200 from Balmar.

Check out the electrickery posts at https://marinehowto.com , plenty of other DC Electric 101 learning resources coming soon.
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