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Old 09-28-2013, 05:50 PM   #1
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Recommend Simple Safe Trickle Charger

I would like to keep the genset starting battery charged. Can anyone recommend a simple trickle charger that I can plug into AC when in slip so that my battery stats topped off? I have an outlet within 4 feet.

Suggestions?
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Old 09-28-2013, 05:54 PM   #2
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Suggestions?
12v Battery Charger, Battery Desulfator, Battery Maintainer, Charger
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Old 09-28-2013, 06:05 PM   #3
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I use the GUEST Battery Pal. Works good, lasts a long time.
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Old 09-28-2013, 06:15 PM   #4
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Of course, one of those solar panel trickle chargers at Harbor Freight would also do the job just fine. Pretty cheap too.
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Old 09-28-2013, 08:00 PM   #5
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Old 09-29-2013, 06:38 AM   #6
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The most modern chargers SHUT OFF after the charge is finished , do not stay on at some lower float voltage.

This is done to reduce water usage , and the need to water the set.

Of course it resumes charging when required as the voltage falls internally.

However the $50 buck choice will probably give a start batt its normal service life, for a $1.00 gal of distilled water every year.
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Old 09-29-2013, 10:04 AM   #7
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Note that if left attached to the battery without AC on the charger, they will act as a small shunt and slowly drain/kill the battery. I learned this the hard way when boat was in winter storage and only plugged in once a month for topping batteries. The small trickle over 24 hours wasn't enough to overcome many days of drain. Obviously not a problem if always plugged in.
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Old 09-29-2013, 09:52 PM   #8
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Thanks all! Good info
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Old 09-30-2013, 07:17 AM   #9
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Quote:
Originally Posted by 6-Pack View Post
I would like to keep the genset starting battery charged. Can anyone recommend a simple trickle charger that I can plug into AC when in slip so that my battery stats topped off? I have an outlet within 4 feet.

Suggestions?
I find the Ctek range great. They are all smart charges, and can be left on for long periods, and there is a size for everything. I use the Marine M200 (15Amp) for house coupled with the M300 which is a companion charger to the marine series and designed specifically for keeping the starter batt charged up. It has all the functions, but only puts out about 0.9Amp
CTEK Battery Chargers - The World's Smarter Battery Charger
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Old 01-03-2017, 07:27 PM   #10
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I am wondering how one of these Bosch chargers would go as a permanent install.
Power point is a couple of feet from start batts.

BOSCH 12V & 24V BATTERY CHARGER 7A / 3.5A MAINTAINER TRICKLE AGM GEL MXS7.0 C7

For the last several weeks with constantly changing strong winds trips have been 3 miles to a NE anchorage for a few days then 3 miles to a SE anchorage rinse and repeat and I suspect the start batteries aren't getting enough charge.

At the moment I have a normal 12v charger hooked up to each of the 12v (in series) starts but that is not ideal.
To wire up the trickle charger from the Victron multi plus requires more in wire and labour pulling panelling than the Bosch charger would cost.
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Old 01-03-2017, 07:33 PM   #11
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Sorry don't know much about the Bosch charger but I do know many happy Etek smart charger users .

CTEK Multi US 25000 - CTEK Battery ChargersCTEK Battery Chargers
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Old 01-03-2017, 08:21 PM   #12
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Sorry don't know much about the Bosch charger but I do know many happy Etek smart charger users .

CTEK Multi US 25000 - CTEK Battery ChargersCTEK Battery Chargers
For sure, but more than 3x the $ and pretty sure I don't need 25 amps for trickle charging starts.

Bosch used to be a very reputable brand, not sure if anything has happened to change that.

Add: the ctek is also 12v so I would need 2 of them
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Old 01-03-2017, 08:30 PM   #13
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For sure, but more than 3x the $ and pretty sure I don't need 25 amps for trickle charging starts.

Bosch used to be a very reputable brand, not sure if anything has happened to change that.

When I was chatting to me marine electrician he recommended the larger smart charger over the smaller ones available .He said the small ones are ok for a single battery but useless on a bank of battery's.
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Old 01-03-2017, 08:45 PM   #14
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These are not my house batteries, they have a 5000va/100a charger attached.

These are my starts and starts alone.

The ctek 24v "maintenance" charger puts out 4 amp vs the Bosch at 3.5 amp.
Its still 3 x the $
http://www.ctek.com/au/en/chargers/24v
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Old 01-04-2017, 08:28 AM   #15
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https://www.amazon.com/NOCO-G7200-Ul...004LX3AS6?th=1

Noco Genius brand are smart chargers in a variety of amperages. The 24 volt offerings start at 7.2amp.

I bought the 3/4 amp one and am impressed by its smarts.

I watched it work on an auto battery out of my sports car, that wasn't being driven much this past summer. Battery tested lowest part of "good" on a traditional auto load tester. It needed boosting back in the spring, so I wasn't expecting much...

The charger varied the voltage up and down, each time reaching a little higher. It took a week of this slow cycling to sneak up to 15 volts, then settled back to a rest and charge cycle that stays down in the upper 12-lower 13 ranges.

It did the same thing with a brand new YUASA battery that I bought for my Yamaha generator that ships dry, add the acid and charge up. It varied voltages, up to 15 and then settled back.

I like that I can see it leaving the battery alone once it is charged, unlike the simpler ones of the past, they just inflict a steady voltage all the time.

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Old 01-04-2017, 08:59 AM   #16
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Not sure if these would be appropriate for the application you're wanting but I've used the 'Battery Tender' line of products for years for all of my cars and motorcycles. In fact, I'm using one of their products at this very moment on my vintage Land Cruiser which is parked in my garage in Colombia (I'm currently in Huatulco, MX):

Chargers



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Old 01-04-2017, 07:17 PM   #17
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Looking at the manual for the victron multiplus 5000 that we have and the aux charger designed for connecting to the start batteries puts out 4 amps.

It says run a wire from the victron to +start and a wire from -start to -terminal on house bank.

Seeing as its a 4 amp charge but is a longish run I would think a 10amp extension lead cable would be up for the job.
I have a newish one sitting in front of me now that is missing an end So this will be a good use for it.
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Old 01-04-2017, 07:44 PM   #18
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Looking at the manual for the victron multiplus 5000 that we have and the aux charger designed for connecting to the start batteries puts out 4 amps.

It says run a wire from the victron to +start and a wire from -start to -terminal on house bank.

Seeing as its a 4 amp charge but is a longish run I would think a 10amp extension lead cable would be up for the job.
I have a newish one sitting in front of me now that is missing an end So this will be a good use for it.
What is the length of the run?
You need to factor in the voltage drop for distance.
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Old 01-04-2017, 08:37 PM   #19
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What is the length of the run?
You need to factor in the voltage drop for distance.
7m max

That's why I thought 4 amp @ 24v running through what was a 20 metre 10 amp @ 240v cable should be fine.
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Old 01-04-2017, 08:45 PM   #20
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I second the Battery Minders - Have several and have used them for yrs.
(others may work equally as well but I know these work well)

I believe they at least partially restored an older battery via the desulphation mode -
I did a little experiment when i first started using them...
Fully charged (via normal charger) rest & measure V
Used batty Minder w/ desulphation - rest & measure V
Improved after desulphation w/ BM but don't recall the exact #'s

I keep several stored batt'ys topped up w/ them

One caveat - BM tech rep indicated it is not a good idea to leave them connected if the 120V power is disconnected as the unit puts a small? drain on the batery w/ no 120V power applied - short term no problem longer term will run a batty down eventually
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