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countrykids

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Posted: 08/24/19 05:56pm Link  |  Quote  |  Print  |  Notify Moderator

We will be boon docking at the same location for several days and I am concerned about maintaining battery.power. We have two group 27 batteries, a 4 KVA on board generator and a 40 amp 3 stage converter. If batteries are dropped to 50%, how long does the generator have to be run to refill the batteries assuming little other power usage?


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DFord

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Posted: 08/24/19 06:35pm Link  |  Quote  |  Print  |  Notify Moderator

Just run it an hour or two in the morning while you're making coffee or heating something in the microwave. Then again in the evening for a couple more hours before retiring and you should be fine. The 12v batteries you have won't have a very high capacity so try to conserve while the generator isn't running. If you need heat, they should be able to run the furnace overnight.


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Lwiddis

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Posted: 08/24/19 08:13pm Link  |  Quote  |  Print  |  Notify Moderator

Four hours of recommended generator time per day. Not too pleasant if your neighbors are close or even for you. Gee, could there be another way to silently recharge FULLY almost every day? That would be heaven sent.

* This post was edited 08/24/19 08:25pm by Lwiddis *


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philh

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Posted: 08/24/19 08:20pm Link  |  Quote  |  Print  |  Notify Moderator

WFCO charger is a POS

Bobbo

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Posted: 08/24/19 08:42pm Link  |  Quote  |  Print  |  Notify Moderator

With a good 4 stage converter/charger, 4 hours. WFCO is not a good converter/charger. Magnatek/Parallax is an absolutely s****y converter/charger. My preference (put in 2 RVs) is Progressive Dynamics, although there are others that are as good.


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time2roll

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Posted: 08/24/19 08:47pm Link  |  Quote  |  Print  |  Notify Moderator

If your converter is putting 14.4+ volts on the battery you need a solid three hours.
If you have the typical WFCO or parallax at 13.6 volts it will be 12+ hours.


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theoldwizard1

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Posted: 08/24/19 08:55pm Link  |  Quote  |  Print  |  Notify Moderator

If you are manually charging, the max charge rate should not exceed 30% of the battery capacity. A dual purpose Group 27 batteries is rated at 90Ah so charging at the max rate would be 30A. At max charging rate, it should take about 3 hours, probably a bit longer if you have a good multi-stage charger.

If you battery has been discharged to 50% SOC, you have shortened its life.

wa8yxm

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Posted: 08/25/19 05:42am Link  |  Quote  |  Print  |  Notify Moderator

If you run those batteries down to 50 Percent it's not good for 'em. 75 percent is about the minimum for MARINE/deep cycle beyond that they age very fast.

Now I would not replace them till they need it but when they do consider GC-2 Golf car batteries or GC-12's these are True DEEP CYCLE and do not mind 50% at all that's the design limit though.

To recharge
You have about 200 amp hours (Bit less) so at 40 amps to replace 100 AH would take about 3 hours .. But that will only get you to about 90%. the next 3 hours should top you off.. So I'd go 6 hours Might get there in 5 but I'd say six.


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PNW_Steve

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Posted: 08/25/19 08:28am Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

If you run those batteries down to 50 Percent it's not good for 'em. 75 percent is about the minimum for MARINE/deep cycle beyond that they age very fast.

Now I would not replace them till they need it but when they do consider GC-2 Golf car batteries or GC-12's these are True DEEP CYCLE and do not mind 50% at all that's the design limit though.

To recharge
You have about 200 amp hours (Bit less) so at 40 amps to replace 100 AH would take about 3 hours .. But that will only get you to about 90%. the next 3 hours should top you off.. So I'd go 6 hours Might get there in 5 but I'd say six.


What he said [emoticon]

One thing to add. Discharging and partially recharging (not reaching 100% SOC) will shorten your battery life.

Common recommendation is make sure you charge to 100% at least once a week.

When it comes time to replace your current batteries I would recommend looking at something like the Duracell GC2 or Trojan T105. They are "true" deep cycle where the typical group 27/31 "marine deep cycle" is a hybrid starting/deep cycle.


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countrykids

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Posted: 08/25/19 08:36am Link  |  Quote  |  Print  |  Notify Moderator

Thanks for all your help. As LWDDIS cleverly pointed out it makes solar look pretty good.

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