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Old 09-07-2018, 10:32   #1
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Location: near Bainbridge Island, Wa
Boat: Catalina S320
Posts: 34
Does batt manager and inverter need to play nicely

I am ready to purchase a battery management system and a new inverter and I want to have good quality and compatibility.

I have a 'new-to-me' Catalina 320

It has a good alternator on the Yanmar, and a separate Honda generator.

It also has a Charles Marine 30 charger.

It has two large deep cycle batts wired together for the house battery and a separate battery for engine starting.

I don't expect extreme needs for A/C while on battery only, just some moderate normal usage.

My research seems to point me to a Victron 712 for the power management (is this not the best? should I consider Simarine?, or other?)

Would the Victron be able to control the starter battery at the same time?

Does the Victron view the two house batteries as just one?

I don't have an opinion yet on a new "inverter" can you recommend one that would be compatible with the Charles charger and the Victron... is that really necessary?

thanks for all help and opinions
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Old 10-07-2018, 15:26   #2
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Re: Does batt manager and inverter need to play nicely

OK.

A BMS has specific meaning here, and applies to cell-level electronics for LFP banks.

The Victron - latest is 712-BMV - is also an AH-counting device, displays Volts and Amps realtime.

Battery Monitor is the overall product category.

It tries to guesstimate SoC as well, and is IMO top-notch best at that, among the ones that are based on counting AH in and out.

But to be anywhere close to accurate, you will need to program it correctly, keep its setting "total AH capacity" of your bank up to date as that declines, and reset it frequently at the 100% SoC point, ideally every cycle.
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Old 10-07-2018, 15:29   #3
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Re: Does batt manager and inverter need to play nicely

The Merlin SmartGauge is more accurate, without all that fuss, more user friendly, just works.

But only shows Voltage and SoC, no counting AH.

Many buy SG and the Victron BMV together for that reason

Forget Simarine for SoC, not accurate.
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Old 10-07-2018, 15:33   #4
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Re: Does batt manager and inverter need to play nicely

Quote:
Originally Posted by seapop View Post
Would the Victron be able to control the starter battery at the same time?

Does the Victron view the two house batteries as just one?
Generally a BM does not control things, at least at your current knowledge level and system simplicity,

it just monitors your bank SoC so you don't draw it too low and reduce longevity much.

Only one bank per BM for that, you should only have one House bank, and it will show Volts for the Starter, which is all you need.
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Old 10-07-2018, 15:40   #5
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Re: Does batt manager and inverter need to play nicely

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Originally Posted by seapop View Post
I don't expect extreme needs for A/C while on battery only, just some moderate normal usage.

I don't have an opinion yet on a new "inverter" can you recommend one that would be compatible with the Charles charger and the Victron... is that really necessary?
You should not try to run aircon from the bank, only while the genny is running.

Most people with simple systems only use aircon while plugged into shore power at a marina.

Personally I recommend avoiding using mains appliances that would require an inverter while off grid.

It definitely increases energy usage, cost and system complexity.

The best approach while off grid is conservation, living within a very limited energy budget, at least until you have a clearer understanding, and know what you're getting into.

How big is your boat?

How many AH do you think is the capacity of your House bank.

How much solar is installed?

How long / how often do you plan to be off grid at a time?

Do you have an up to date electrical systems diagram?
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