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Engel Battery Monitor - 10.5 V or 11.5V

Submitted: Tuesday, Feb 03, 2004 at 09:02

Member - Andrew & Jen (Melb)

I have a 100 Series T/D Landcruiser which already has two batteries for cranking the engine. I have a 60 litre Engel fridge and I think that at some point we will buy a camper trailer which I assume will have a fridge in it. I don't think that a third battery at this point is worth the expense and I was thinking of just buying a battery monitor that will cut out if the voltage drops. There are two available and I was not sure what one to buy. One of the ads lists them like this:
BM 12-10.5V. Get the most 'on-time' possible.
BM 12A -11.5V. For the more cautious.
I don't know whether to be cautious or go for the on-time!!
I think I want both!
Any advice appreciated coz I think it might be on my shopping list for Wandin.
Andrew
2001 Landcruiser 100S Turbo Diesel
"We do not stop playing because we grow old; we grow old because we stop playing"
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ThreadID: 10231 Replies: 4
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AnswerID: 45294   Submitted: Tuesday, Feb 03, 2004 at 13:34

Member - Geoff & Jen replied:

I think its more like going on your birthday list and on Jens shopping list. HeeeeHa Geoff did something like this in our van, I will have to ask him when he appears.Looking forward to the cruise and snooze years.........Retirement
Reply 1 of 4
FollowupID: 307411   Submitted: Tuesday, Feb 03, 2004 at 16:54

Member - Andrew & Jen (Melb) posted:

Thanks for hinting to Jen 'georgous couple from northern climes.' Would be a great place to pick up some pressies for Jen at the 4wd shows.
Andrew2001 Landcruiser 100S Turbo Diesel
"We do not stop playing because we grow old; we grow old because we stop playing"
FollowUp 1 of 7
FollowupID: 307420   Submitted: Tuesday, Feb 03, 2004 at 17:34

Member - Geoff & Jen posted:

George the horse was off course again, we have a seperate system for the van with all sorts of gadgets for 12volt and 240. I replied to your post as you looked like a lonely little onion in a pertunia patch.Looking forward to the cruise and snooze years.........Retirement
FollowUp 2 of 7
FollowupID: 307422   Submitted: Tuesday, Feb 03, 2004 at 18:15

Member - Andrew & Jen (Melb) posted:

Sorry Geoffrey - of course I did mean Gorgeous...... ha ha ha2001 Landcruiser 100S Turbo Diesel
"We do not stop playing because we grow old; we grow old because we stop playing"
FollowUp 3 of 7
FollowupID: 307423   Submitted: Tuesday, Feb 03, 2004 at 18:16

Member - Andrew & Jen (Melb) posted:

..... and I was thinking "nobody loved me" for a little while.....2001 Landcruiser 100S Turbo Diesel
"We do not stop playing because we grow old; we grow old because we stop playing"
FollowUp 4 of 7
FollowupID: 307459   Submitted: Tuesday, Feb 03, 2004 at 21:54

Member - Geoff & Jen posted:

Poor You, of course you are loved, look at all your fanz. We have just been to see our new little 4x4. Should be ready for crawling all sorts of terrain by winter. Talk about torque, gee he's got some grunt. ( Just to keep in tune with the subject matter) Looking forward to the cruise and snooze years.........Retirement
FollowUp 5 of 7
FollowupID: 307470   Submitted: Wednesday, Feb 04, 2004 at 05:44

Member - Andrew & Jen (Melb) posted:

Oh yes - I have lots of fanz - they all love me particularly when I say "who wants an icecream?" Yeh kids are great. Your new fourby sounds a beauty - wont be long and and it'll be screaming down the highway on a trip somewhere!2001 Landcruiser 100S Turbo Diesel
"We do not stop playing because we grow old; we grow old because we stop playing"
FollowUp 6 of 7
FollowupID: 307533   Submitted: Wednesday, Feb 04, 2004 at 14:48

Member - Geoff & Jen posted:

Yes, Mr whippy, The fourby is white, and does great black burnouts without screeching, should be a breeze when hitting the busy highway, the wind passes smoothly without a hiccup.Looking forward to the cruise and snooze years.........Retirement
FollowUp 7 of 7
AnswerID: 45314   Submitted: Tuesday, Feb 03, 2004 at 15:44

Mick replied:

You do realise that at 10.5 volts, your battery will be 110% flat.
At 11.8 volts your battery will only have 20% left in it, and if dropped below this point will start sulphating plates and decreasing the life slowly. If flattened to 10.5 volts, you will need a quick charge to get it back up to 13.2 volts (full), and be on the safe side!
Get the one that stops it at 11.5 and your battery may last a bit longer!
Reply 2 of 4
FollowupID: 307410   Submitted: Tuesday, Feb 03, 2004 at 16:53

Member - Andrew & Jen (Melb) posted:

Thanks for the advice. I was just thinking that 10.5 volts didn't sound too bad but obviously it is not particularly good. I was just worrying that it might not crank over too well when the battery was 10.5 volts. Don't want to stuff my batteries though.
Thanks for your answer.
Andrew2001 Landcruiser 100S Turbo Diesel
"We do not stop playing because we grow old; we grow old because we stop playing"
FollowUp 1 of 1
AnswerID: 45374   Submitted: Wednesday, Feb 04, 2004 at 01:02

brett replied:

A lot depends on the quality of the battery, a high quality battery will not have too much trouble being discharged to 10.5V as long as that is as low as it goes and it is charged back up as quick as possible. Obviously this is not ideal and if you battery was on float charge all the time it would last longer but this is not practical. I have some sealed gell type batteries that are used in UPS systems and are of very good quality, I regularly take them below 11V and have no trouble. Main thing that will kill any battery is leaving it in a discharged state for long periods of time.
Reply 3 of 4
FollowupID: 307469   Submitted: Wednesday, Feb 04, 2004 at 05:41

Member - Andrew & Jen (Melb) posted:

I am not sure how long the fridge will run if it cuts out at 11.5 Volts - it might be enough though I guess if the motor cranks at 10.5 Volts and it doesn't harm the batteries too much, then that would be better. I think I am confused!2001 Landcruiser 100S Turbo Diesel
"We do not stop playing because we grow old; we grow old because we stop playing"
FollowUp 1 of 1
AnswerID: 45383   Submitted: Wednesday, Feb 04, 2004 at 07:23

Wazza (Vic) replied:

Andrew,

these are supposed to be good at the same job (just to confuse you more) Redarc VS. More info on For links: post 3990.

Is there any reason your 100 series needs the 2 batteries hooked up for cranking? Can it be set up like most people do, so one is for cranking and one is for accessories. Much better for piece of mind in the mornings when you turn the key.

~
Reply 4 of 4
FollowupID: 307476   Submitted: Wednesday, Feb 04, 2004 at 08:48

Member - Andrew & Jen (Melb) posted:

Mr Toyota designed them like that - all the 100 series Turbo-diesels have two batteries that run in parallel. Thanks for the link Wazza2001 Landcruiser 100S Turbo Diesel
"We do not stop playing because we grow old; we grow old because we stop playing"
FollowUp 1 of 1
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