Lead Acid puzzle...

[Tabby]

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?


NT

 

[John Robertson]

On 2020/08/26 5:30 p.m., Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?


NT

http://batteryuniversity.com

John :-#)#

 

[Tabby]

On Thursday, 27 August 2020 01:39:18 UTC+1, John Robertson wrote:

On 2020/08/26 5:30 p.m., Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?


NT


http://batteryuniversity.com

John :-#)#

I didn\'t find much on premature failure there. I did here:
https://www.ecmweb.com/content/article/20887522/why-batteries-fail-prematurely

The only issue I\'m seeing there is uncontrolled temperatures which may have resulted in the battery drying out. Charging to 15.2v has if anything worsened them, which lines up with that. I\'ll try adding acid & water. Thanks

I\'m guessing they managed about 200 cycles of maybe 15-20% discharge average.


NT

 

[Tabby]

On Thursday, 27 August 2020 02:21:08 UTC+1, Tabby wrote:

On Thursday, 27 August 2020 01:39:18 UTC+1, John Robertson wrote:
On 2020/08/26 5:30 p.m., Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?


NT


http://batteryuniversity.com

John :-#)#

I didn\'t find much on premature failure there. I did here:
https://www.ecmweb.com/content/article/20887522/why-batteries-fail-prematurely

The only issue I\'m seeing there is uncontrolled temperatures which may have resulted in the battery drying out. Charging to 15.2v has if anything worsened them, which lines up with that. I\'ll try adding acid & water. Thanks

I\'m guessing they managed about 200 cycles of maybe 15-20% discharge average.


NT

PS I read somewhere that connecting a welder for a few seconds can break off sulphation.


NT

 

[John Robertson]

On 2020/08/26 6:21 p.m., Tabby wrote:

On Thursday, 27 August 2020 01:39:18 UTC+1, John Robertson wrote:
On 2020/08/26 5:30 p.m., Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?


NT


http://batteryuniversity.com

John :-#)#

I didn\'t find much on premature failure there. I did here:
https://www.ecmweb.com/content/article/20887522/why-batteries-fail-prematurely

The only issue I\'m seeing there is uncontrolled temperatures which may have resulted in the battery drying out. Charging to 15.2v has if anything worsened them, which lines up with that. I\'ll try adding acid & water. Thanks

I\'m guessing they managed about 200 cycles of maybe 15-20% discharge average.


NT

Battery University goes into the recommended charging voltages for
batteries - your voltages are too high for lead-acid - and their
business is battery chargers so it seems to make sense to follow their
advice.

John :-#(#

 

[Flyguy]

On Wednesday, August 26, 2020 at 5:30:47 PM UTC-7, Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?


NT

You have a bad cell in one of the batteries, which may be reversed polarity. The charger is over-charging the other cells to bring it up to voltage.

 

[Robert Baer]

Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?


NT

Test a 12V battery, (13.8V appx no load) under 100 amp load and
monitor during test.
If full charge and good battery, the voltage will not be below 10V
for ten seconds.


Thanks.

 

[david eather]

On 27/08/2020 11:21 am, Tabby wrote:

On Thursday, 27 August 2020 01:39:18 UTC+1, John Robertson wrote:
On 2020/08/26 5:30 p.m., Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?


NT


http://batteryuniversity.com

John :-#)#

I didn\'t find much on premature failure there. I did here:
https://www.ecmweb.com/content/article/20887522/why-batteries-fail-prematurely

The only issue I\'m seeing there is uncontrolled temperatures which may have resulted in the battery drying out. Charging to 15.2v has if anything worsened them, which lines up with that. I\'ll try adding acid & water. Thanks

I\'m guessing they managed about 200 cycles of maybe 15-20% discharge average.


NT

200 cycles and a not great battery charger? It sounds like the batteries
are just plain worn out. No mystery at all. New batteries and a better
charger next time.

 

[Jan Panteltje]

On a sunny day (Thu, 27 Aug 2020 16:26:57 +1000) it happened david eather
<eathDELETEer@tpg.com.au> wrote in <UmI1H.928252$Cq6.877074@fx44.am4>:

200 cycles and a not great battery charger? It sounds like the batteries
are just plain worn out. No mystery at all. New batteries and a better
charger next time.

And if you have enough money why not replace with lifepo4 and a charger for that?

 

[Martin Brown]

On 27/08/2020 01:30, Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?

Battery abuse. The cheap charger has knackered both of your batteries.

Recharging lead acid cells for maximum longevity requires some form of
thermal compensation of the voltage per cell during charging. eg

https://batteryuniversity.com/learn/article/charging_at_high_and_low_temperatures

Too much over voltage and they gas. Incorrect treatment on top up and
they sulphate or corrode internally either way you do damage to them.
The weakest cell in a chain fails first and the others then wreck it.

--
Regards,
Martin Brown

 

[Tabby]

On Thursday, 27 August 2020 12:51:35 UTC+1, Martin Brown wrote:

On 27/08/2020 01:30, Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?

Battery abuse. The cheap charger has knackered both of your batteries.

Recharging lead acid cells for maximum longevity requires some form of
thermal compensation of the voltage per cell during charging. eg

https://batteryuniversity.com/learn/article/charging_at_high_and_low_temperatures

Too much over voltage and they gas. Incorrect treatment on top up and
they sulphate or corrode internally either way you do damage to them.
The weakest cell in a chain fails first and the others then wreck it.

Yup. Last time I looked for something suited to SLA AGM all the ones I saw used voltages suited to flooded cells.


NT

 

[Mike Perkins]

On 27/08/2020 01:30:42, Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting
new batteries the available range is down to below 10%. I\'m not clear
what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v
output. Single stage charging only. It has always been promptly
charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v.
Charged each battery independantly to 15.2v, which took maybe half an
hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I
expected to see lower.

What\'s going on here?

Apply a modest load to the two batteries and then measure across them.
0.5V is a modest difference for two matched batteries.


--
Mike Perkins
Video Solutions Ltd
www.videosolutions.ltd.uk

 

[Flyguy]

On Thursday, August 27, 2020 at 4:51:35 AM UTC-7, Martin Brown wrote:

On 27/08/2020 01:30, Tabby wrote:
Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?
Battery abuse. The cheap charger has knackered both of your batteries.

Recharging lead acid cells for maximum longevity requires some form of
thermal compensation of the voltage per cell during charging. eg

https://batteryuniversity.com/learn/article/charging_at_high_and_low_temperatures

Too much over voltage and they gas. Incorrect treatment on top up and
they sulphate or corrode internally either way you do damage to them.
The weakest cell in a chain fails first and the others then wreck it.

--
Regards,
Martin Brown

Temperature compensation during charging is vital to maintaining the health of a battery, and they are available:
http://www.chargingchargers.com/chargers/golf-cart/48-volt-yamaha-18.html
You must have a REALLY old cart, being 24V.

 

[Chris]

On 08/27/20 01:30, Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6& 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v& 12.8v. I expected to see lower.

What\'s going on here?


NT

The data sheets for the better brands of the gel cell types have
a graph showing expected life vs number of charge / recharge
cycles. Typical design life for ups float applications can be as much
as 10 years, but under regular cycling, can be << 5 years.
The deeper the discharge, the more detrimental the effect.
Carts must hammer batteries pretty hard, especially if they skimp on
a/h capacity to keep costs down. 38ah doesn\'t sound like much for
what must be a 1/2 to 1hp motor, at 24 v, 1hp ~= 30 amp, then you
have the much higher startup current. You get what you pay for, but
Yuasa at least have different optimised types depending on type of
service.

I would put in bigger batteries, say 100 ah might work a lot better...

Chris

 

[Sjouke Burry]

On 28.08.20 20:50, Chris wrote:

On 08/27/20 01:30, Tabby wrote:
Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6& 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v& 12.8v. I expected to see lower.

What\'s going on here?


NT

The data sheets for the better brands of the gel cell types have
a graph showing expected life vs number of charge / recharge
cycles. Typical design life for ups float applications can be as much
as 10 years, but under regular cycling, can be << 5 years.
The deeper the discharge, the more detrimental the effect.
Carts must hammer batteries pretty hard, especially if they skimp on
a/h capacity to keep costs down. 38ah doesn\'t sound like much for
what must be a 1/2 to 1hp motor, at 24 v, 1hp ~= 30 amp, then you
have the much higher startup current. You get what you pay for, but
Yuasa at least have different optimised types depending on type of
service.

I would put in bigger batteries, say 100 ah might work a lot better...

Chris

And dont forget to buy a high quality computerized charger.
A cheap bad one wil sulfide the batteries in notime.

 

[Chris]

On 08/28/20 23:21, Sjouke Burry wrote:

On 28.08.20 20:50, Chris wrote:
On 08/27/20 01:30, Tabby wrote:
Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting
new batteries the available range is down to below 10%. I\'m not clear
what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v
output. Single stage charging only. It has always been promptly
charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6& 13.8v.
Charged each battery independantly to 15.2v, which took maybe half an
hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v& 12.8v. I
expected to see lower.

What\'s going on here?


NT

The data sheets for the better brands of the gel cell types have
a graph showing expected life vs number of charge / recharge
cycles. Typical design life for ups float applications can be as much
as 10 years, but under regular cycling, can be << 5 years.
The deeper the discharge, the more detrimental the effect.
Carts must hammer batteries pretty hard, especially if they skimp on
a/h capacity to keep costs down. 38ah doesn\'t sound like much for
what must be a 1/2 to 1hp motor, at 24 v, 1hp ~= 30 amp, then you
have the much higher startup current. You get what you pay for, but
Yuasa at least have different optimised types depending on type of
service.

I would put in bigger batteries, say 100 ah might work a lot better...

Chris

And dont forget to buy a high quality computerized charger.
A cheap bad one wil sulfide the batteries in notime.

Fully charged terminal voltage is critical as well, typically 2.3
volts per cell max, but the data sheets will have voltage vs
temperature curves. Overcharging increases gassing which should
normally be minimal. The UPS people have years of experience of
that, as opposed to consumer electronics product, where the charger
often looks like an afterthought...

Chris

 

[Tabby]

On Friday, 28 August 2020 01:30:59 UTC+1, Flyguy wrote:

On Thursday, August 27, 2020 at 4:51:35 AM UTC-7, Martin Brown wrote:
On 27/08/2020 01:30, Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6 & 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v & 12.8v. I expected to see lower.

What\'s going on here?

Battery abuse. The cheap charger has knackered both of your batteries.

Recharging lead acid cells for maximum longevity requires some form of
thermal compensation of the voltage per cell during charging. eg

https://batteryuniversity.com/learn/article/charging_at_high_and_low_temperatures

Too much over voltage and they gas. Incorrect treatment on top up and
they sulphate or corrode internally either way you do damage to them.
The weakest cell in a chain fails first and the others then wreck it.

--
Regards,
Martin Brown

Temperature compensation during charging is vital to maintaining the health of a battery, and they are available:
http://www.chargingchargers.com/chargers/golf-cart/48-volt-yamaha-18.html
You must have a REALLY old cart, being 24V.

It\'s 48v, 115v and $459, no use on 3 counts. The ones nearer what I\'m looking for lack temp compensation.


NT

 

[Tabby]

On Friday, 28 August 2020 19:50:55 UTC+1, Chris wrote:

On 08/27/20 01:30, Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I\'m not clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6& 13.8v. Charged each battery independantly to 15.2v, which took maybe half an hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v& 12.8v. I expected to see lower.

What\'s going on here?


NT

The data sheets for the better brands of the gel cell types have
a graph showing expected life vs number of charge / recharge
cycles. Typical design life for ups float applications can be as much
as 10 years, but under regular cycling, can be << 5 years.
The deeper the discharge, the more detrimental the effect.
Carts must hammer batteries pretty hard, especially if they skimp on
a/h capacity to keep costs down. 38ah doesn\'t sound like much for
what must be a 1/2 to 1hp motor, at 24 v, 1hp ~= 30 amp, then you
have the much higher startup current. You get what you pay for, but
Yuasa at least have different optimised types depending on type of
service.

I would put in bigger batteries, say 100 ah might work a lot better...

Chris

2x 100Ah adds a ton of weight. Range is not a problem, depth of discharge is usually fine, just occasionally pushed. Looks like it mainly needs a reasonably decent charger.

1hp? Dunno but I doubt it. The onboard breaker is 30A.


NT

 

[Tabby]

On Saturday, 29 August 2020 01:38:09 UTC+1, Chris wrote:

On 08/28/20 23:21, Sjouke Burry wrote:
On 28.08.20 20:50, Chris wrote:
On 08/27/20 01:30, Tabby wrote:
Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting
new batteries the available range is down to below 10%. I\'m not clear
what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v
output. Single stage charging only. It has always been promptly
charged after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6& 13.8v.
Charged each battery independantly to 15.2v, which took maybe half an
hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v& 12.8v. I
expected to see lower.

What\'s going on here?


NT

The data sheets for the better brands of the gel cell types have
a graph showing expected life vs number of charge / recharge
cycles. Typical design life for ups float applications can be as much
as 10 years, but under regular cycling, can be << 5 years.
The deeper the discharge, the more detrimental the effect.
Carts must hammer batteries pretty hard, especially if they skimp on
a/h capacity to keep costs down. 38ah doesn\'t sound like much for
what must be a 1/2 to 1hp motor, at 24 v, 1hp ~= 30 amp, then you
have the much higher startup current. You get what you pay for, but
Yuasa at least have different optimised types depending on type of
service.

I would put in bigger batteries, say 100 ah might work a lot better...

Chris

And dont forget to buy a high quality computerized charger.
A cheap bad one wil sulfide the batteries in notime.


Fully charged terminal voltage is critical as well, typically 2.3
volts per cell max, but the data sheets will have voltage vs
temperature curves. Overcharging increases gassing which should
normally be minimal. The UPS people have years of experience of
that, as opposed to consumer electronics product, where the charger
often looks like an afterthought...

Chris

AIUI gassing is not an option for AGM. That rules out most chargers on offer. UPSes have a terrible record of battery abuse.

I might have to take the idea of making a charger seriously, I\'ve never found one that does what\'s needed. Not that it\'s difficult, 240v 24v multistage AGM charging with temp comp.


NT

 

[none]

In article <d95655fb-7655-4156-a1b7-44ae2f89379co@googlegroups.com>,
Tabby <tabbypurr@gmail.com> wrote:

On Friday, 28 August 2020 19:50:55 UTC+1, Chris wrote:
On 08/27/20 01:30, Tabby wrote:

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after
fitting new batteries the available range is down to below 10%. I\'m not
clear what\'s gone wrong.

The charger in use has been a cheap chinese one with 2x13.7v=27.4v
output. Single stage charging only. It has always been promptly charged
after use, and never run below 50% charge.

I checked the battery voltages after charge, they were 13.6& 13.8v.
Charged each battery independantly to 15.2v, which took maybe half an
hour or so. No range improvement.

When apparently flat the batteries read, offload, 12.3v& 12.8v. I
expected to see lower.

What\'s going on here?


NT

The data sheets for the better brands of the gel cell types have
a graph showing expected life vs number of charge / recharge
cycles. Typical design life for ups float applications can be as much
as 10 years, but under regular cycling, can be << 5 years.
The deeper the discharge, the more detrimental the effect.
Carts must hammer batteries pretty hard, especially if they skimp on
a/h capacity to keep costs down. 38ah doesn\'t sound like much for
what must be a 1/2 to 1hp motor, at 24 v, 1hp ~= 30 amp, then you
have the much higher startup current. You get what you pay for, but
Yuasa at least have different optimised types depending on type of
service.

I would put in bigger batteries, say 100 ah might work a lot better...

Chris

2x 100Ah adds a ton of weight. Range is not a problem, depth of
discharge is usually fine, just occasionally pushed. Looks like it
mainly needs a reasonably decent charger.

Where did I get the idea that car batteries, golf cart batteries
and marine boat batteries all have fundamentally different designs?
Where did I hear that golf cart batteries can be routinely discharged
to about 10.5 volt, which would kill a car battery?

At least you should not head any generic advice about handling
batteries, i.e. advise that doesnot address the specific battery you have.

You may assume that golf cart batteries are okay for golf carts.

1hp? Dunno but I doubt it. The onboard breaker is 30A.


NT

Groetjes Albert
--
This is the first day of the end of your life.
It may not kill you, but it does make your weaker.
If you can\'t beat them, too bad.
albert@spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst