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 > How to charge a battery

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Tom_M

New Hope, MN

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Posted: 06/27/21 04:28am Link  |  Quote  |  Print  |  Notify Moderator

My 1000 watt Yamaha does just fine with my 45 amp converter. Make sure fridge is set to run on propane and water heater 120 volt is turned off if so equipped.


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swimmer_spe

Sudbury, Ontario, Canada

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Posted: 06/27/21 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

The converter is a 55A one.

BFL13

Victoria, BC

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Posted: 06/27/21 07:58pm Link  |  Quote  |  Print  |  Notify Moderator

If you recharge when the batts are not very low, they will not draw as many amps, so the 1000w gen could do that, although it will take longer to get back up in the higher SOC range.

You can't get a true resting voltage but just use the voltage when nothing much is on and recharge at 12.4v instead of waiting for 12.2v.

Have access to gas for the gen as you might have long running times. Still beats using that 6a charger.


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swimmer_spe

Sudbury, Ontario, Canada

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Posted: 06/27/21 08:02pm Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

If you recharge when the batts are not very low, they will not draw as many amps, so the 1000w gen could do that, although it will take longer to get back up in the higher SOC range.

You can't get a true resting voltage but just use the voltage when nothing much is on and recharge at 12.4v instead of waiting for 12.2v.

Have access to gas for the gen as you might have long running times. Still beats using that 6a charger.


The goal will be to optimize the time that I can run the generator. I'll have a few cans of gas ready to go to let it run as long as I can.

BFL13

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Posted: 06/27/21 08:24pm Link  |  Quote  |  Print  |  Notify Moderator

You will have to learn what will be enough gen time to get you by till next day. If you can, be worth trying it at home to get an idea what works.

swimmer_spe

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Posted: 06/27/21 08:31pm Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

You will have to learn what will be enough gen time to get you by till next day. If you can, be worth trying it at home to get an idea what works.


I know I can last about 2 nights boondocking. I also will be bringing a second battery. We are boondocking for 3 nights. That is why the question is between using my 6a portable charger connected and using the on board charger.

BFL13

Victoria, BC

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Posted: 06/27/21 08:48pm Link  |  Quote  |  Print  |  Notify Moderator

If you do two nights so the batt is 12.2v, then the gen can't run the 55 amper at 55 amps like it will at first.

If you recharge each day at 12.4v, then the 55 amper will be charging at more like 30 amps at first so the gen can do that.

30 amps beats 6 amps by miles.

swimmer_spe

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Posted: 06/27/21 08:51pm Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

If you do two nights so the batt is 12.2v, then the gen can't run the 55 amper at 55 amps like it will at first.

If you recharge each day at 12.4v, then the 55 amper will be charging at more like 30 amps at first so the gen can do that.

30 amps beats 6 amps by miles.


Agreed. The plan is to try to run everyday. At worse, the spare battery will be for running the jack when I need to move it. Once i got back on shore power, I'd just swap the batteries out and let the few days at the 30 amp site charge it.

enblethen

Moses Lake, WA

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Posted: 06/27/21 11:03pm Link  |  Quote  |  Print  |  Notify Moderator

We run our genset while coffee is brewing and breakfast is cooked in the morning. Then we run for dinner. That run time normally takes care of batteries except when furnace runs a lot.


Bud
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